/* Jackson JSON-processor.
 *
 * Copyright (c) 2007- Tatu Saloranta, tatu.saloranta@iki.fi
 */
package com.fasterxml.jackson.core;

import java.io.*;
import java.lang.ref.SoftReference;
import java.net.URL;

import com.fasterxml.jackson.core.format.InputAccessor;
import com.fasterxml.jackson.core.format.MatchStrength;
import com.fasterxml.jackson.core.io.*;
import com.fasterxml.jackson.core.json.*;
import com.fasterxml.jackson.core.json.async.NonBlockingJsonParser;
import com.fasterxml.jackson.core.sym.ByteQuadsCanonicalizer;
import com.fasterxml.jackson.core.sym.CharsToNameCanonicalizer;
import com.fasterxml.jackson.core.util.BufferRecycler;
import com.fasterxml.jackson.core.util.BufferRecyclers;
import com.fasterxml.jackson.core.util.DefaultPrettyPrinter;

The main factory class of Jackson package, used to configure and construct reader (aka parser, JsonParser) and writer (aka generator, JsonGenerator) instances. 

Factory instances are thread-safe and reusable after configuration
(if any). Typically applications and services use only a single
globally shared factory instance, unless they need differently
configured factories. Factory reuse is important if efficiency matters;
most recycling of expensive construct is done on per-factory basis.

Creation of a factory instance is a light-weight operation,
and since there is no need for pluggable alternative implementations
(as there is no "standard" JSON processor API to implement),
the default constructor is used for constructing factory
instances.
Author:
Tatu Saloranta/**
 * The main factory class of Jackson package, used to configure and
 * construct reader (aka parser, {@link JsonParser})
 * and writer (aka generator, {@link JsonGenerator})
 * instances.
 *<p>
 * Factory instances are thread-safe and reusable after configuration
 * (if any). Typically applications and services use only a single
 * globally shared factory instance, unless they need differently
 * configured factories. Factory reuse is important if efficiency matters;
 * most recycling of expensive construct is done on per-factory basis.
 *<p>
 * Creation of a factory instance is a light-weight operation,
 * and since there is no need for pluggable alternative implementations
 * (as there is no "standard" JSON processor API to implement),
 * the default constructor is used for constructing factory
 * instances.
 *
 * @author Tatu Saloranta
 */
@SuppressWarnings("resource")
public class JsonFactory
    extends TokenStreamFactory
    implements Versioned,
        java.io.Serializable // since 2.1 (for Android, mostly)
{
    private static final long serialVersionUID = 2;

    /*
    /**********************************************************
    /* Helper types
    /**********************************************************
     */

    
Enumeration that defines all on/off features that can only be changed for JsonFactory. /**
     * Enumeration that defines all on/off features that can only be
     * changed for {@link JsonFactory}.
     */
    public enum Feature {
        
        // // // Symbol handling (interning etc)
        
        
Feature that determines whether JSON object field names are to be canonicalized using String.intern or not: if enabled, all field names will be intern()ed (and caller can count on this being true for all such names); if disabled, no intern()ing is done. There may still be basic canonicalization (that is, same String will be used to represent all identical object property names for a single document). 
 Note: this setting only has effect if CANONICALIZE_FIELD_NAMES is true -- otherwise no canonicalization of any sort is done. 

This setting is enabled by default.
/**
         * Feature that determines whether JSON object field names are
         * to be canonicalized using {@link String#intern} or not:
         * if enabled, all field names will be intern()ed (and caller
         * can count on this being true for all such names); if disabled,
         * no intern()ing is done. There may still be basic
         * canonicalization (that is, same String will be used to represent
         * all identical object property names for a single document).
         *<p>
         * Note: this setting only has effect if
         * {@link #CANONICALIZE_FIELD_NAMES} is true -- otherwise no
         * canonicalization of any sort is done.
         *<p>
         * This setting is enabled by default.
         */
        INTERN_FIELD_NAMES(true),

        
Feature that determines whether JSON object field names are to be canonicalized (details of how canonicalization is done then further specified by INTERN_FIELD_NAMES). 

This setting is enabled by default.
/**
         * Feature that determines whether JSON object field names are
         * to be canonicalized (details of how canonicalization is done
         * then further specified by
         * {@link #INTERN_FIELD_NAMES}).
         *<p>
         * This setting is enabled by default.
         */
        CANONICALIZE_FIELD_NAMES(true),

        
Feature that determines what happens if we encounter a case in symbol handling where number of hash collisions exceeds a safety threshold -- which almost certainly means a denial-of-service attack via generated duplicate hash codes. If feature is enabled, an IllegalStateException is thrown to indicate the suspected denial-of-service attack; if disabled, processing continues but canonicalization (and thereby intern()ing) is disabled) as protective
measure.

This setting is enabled by default.
Since:
2.4/**
         * Feature that determines what happens if we encounter a case in symbol
         * handling where number of hash collisions exceeds a safety threshold
         * -- which almost certainly means a denial-of-service attack via generated
         * duplicate hash codes.
         * If feature is enabled, an {@link IllegalStateException} is
         * thrown to indicate the suspected denial-of-service attack; if disabled, processing continues but
         * canonicalization (and thereby <code>intern()</code>ing) is disabled) as protective
         * measure.
         *<p>
         * This setting is enabled by default.
         * 
         * @since 2.4
         */
        FAIL_ON_SYMBOL_HASH_OVERFLOW(true),

        
Feature that determines whether we will use BufferRecycler with ThreadLocal and SoftReference, for efficient reuse of underlying input/output buffers. This usually makes sense on normal J2SE/J2EE server-side processing; but may not make sense on platforms where SoftReference handling is broken (like Android), or if there are retention issues due to ThreadLocal (see Issue #189
for a possible case)

This setting is enabled by default.
Since:
2.6/**
         * Feature that determines whether we will use {@link BufferRecycler} with
         * {@link ThreadLocal} and {@link SoftReference}, for efficient reuse of
         * underlying input/output buffers.
         * This usually makes sense on normal J2SE/J2EE server-side processing;
         * but may not make sense on platforms where {@link SoftReference} handling
         * is broken (like Android), or if there are retention issues due to
         * {@link ThreadLocal} (see
         * <a href="https://github.com/FasterXML/jackson-core/issues/189">Issue #189</a>
         * for a possible case)
         *<p>
         * This setting is enabled by default.
         *
         * @since 2.6
         */
        USE_THREAD_LOCAL_FOR_BUFFER_RECYCLING(true)

        ;

        
Whether feature is enabled or disabled by default.
/**
         * Whether feature is enabled or disabled by default.
         */
        private final boolean _defaultState;

        
Method that calculates bit set (flags) of all features that
are enabled by default.
/**
         * Method that calculates bit set (flags) of all features that
         * are enabled by default.
         */
        public static int collectDefaults() {
            int flags = 0;
            for (Feature f : values()) {
                if (f.enabledByDefault()) { flags |= f.getMask(); }
            }
            return flags;
        }
        
        private Feature(boolean defaultState) { _defaultState = defaultState; }
        
        public boolean enabledByDefault() { return _defaultState; }
        public boolean enabledIn(int flags) { return (flags & getMask()) != 0; }
        public int getMask() { return (1 << ordinal()); }
    }

    /*
    /**********************************************************
    /* Constants
    /**********************************************************
     */
    
    
Name used to identify JSON format (and returned by getFormatName() /**
     * Name used to identify JSON format
     * (and returned by {@link #getFormatName()}
     */
    public final static String FORMAT_NAME_JSON = "JSON";
    
    
Bitfield (set of flags) of all factory features that are enabled by default.
/**
     * Bitfield (set of flags) of all factory features that are enabled by default.
     */
    protected final static int DEFAULT_FACTORY_FEATURE_FLAGS = JsonFactory.Feature.collectDefaults();

    
Bitfield (set of flags) of all parser features that are enabled
by default.
/**
     * Bitfield (set of flags) of all parser features that are enabled
     * by default.
     */
    protected final static int DEFAULT_PARSER_FEATURE_FLAGS = JsonParser.Feature.collectDefaults();
    
    
Bitfield (set of flags) of all generator features that are enabled
by default.
/**
     * Bitfield (set of flags) of all generator features that are enabled
     * by default.
     */
    protected final static int DEFAULT_GENERATOR_FEATURE_FLAGS = JsonGenerator.Feature.collectDefaults();

    public final static SerializableString DEFAULT_ROOT_VALUE_SEPARATOR = DefaultPrettyPrinter.DEFAULT_ROOT_VALUE_SEPARATOR;

    
Since:
2.10/**
     * @since 2.10
     */
    public final static char DEFAULT_QUOTE_CHAR = '"';

    /*
    /**********************************************************
    /* Buffer, symbol table management
    /**********************************************************
     */

    
Each factory comes equipped with a shared root symbol table.
It should not be linked back to the original blueprint, to
avoid contents from leaking between factories.
/**
     * Each factory comes equipped with a shared root symbol table.
     * It should not be linked back to the original blueprint, to
     * avoid contents from leaking between factories.
     */
    protected final transient CharsToNameCanonicalizer _rootCharSymbols = CharsToNameCanonicalizer.createRoot();

    
Alternative to the basic symbol table, some stream-based
parsers use different name canonicalization method.

TODO: should clean up this; looks messy having 2 alternatives
with not very clear differences.
Since:
2.6/**
     * Alternative to the basic symbol table, some stream-based
     * parsers use different name canonicalization method.
     *<p>
     * TODO: should clean up this; looks messy having 2 alternatives
     * with not very clear differences.
     *
     * @since 2.6
     */
    protected final transient ByteQuadsCanonicalizer _byteSymbolCanonicalizer = ByteQuadsCanonicalizer.createRoot();

    /*
    /**********************************************************
    /* Configuration, simple feature flags
    /**********************************************************
     */

    
Currently enabled factory features.
/**
     * Currently enabled factory features.
     */
    protected int _factoryFeatures = DEFAULT_FACTORY_FEATURE_FLAGS;
    
    
Currently enabled parser features.
/**
     * Currently enabled parser features.
     */
    protected int _parserFeatures = DEFAULT_PARSER_FEATURE_FLAGS;

    
Currently enabled generator features.
/**
     * Currently enabled generator features.
     */
    protected int _generatorFeatures = DEFAULT_GENERATOR_FEATURE_FLAGS;

    /*
    /**********************************************************
    /* Configuration, helper objects
    /**********************************************************
     */

    
Object that implements conversion functionality between
Java objects and JSON content. For base JsonFactory implementation
usually not set by default, but can be explicitly set.
Sub-classes (like @link org.codehaus.jackson.map.MappingJsonFactory}
usually provide an implementation.
/**
     * Object that implements conversion functionality between
     * Java objects and JSON content. For base JsonFactory implementation
     * usually not set by default, but can be explicitly set.
     * Sub-classes (like @link org.codehaus.jackson.map.MappingJsonFactory}
     * usually provide an implementation.
     */
    protected ObjectCodec _objectCodec;

    
Definition of custom character escapes to use for generators created
by this factory, if any. If null, standard data format specific
escapes are used.
/**
     * Definition of custom character escapes to use for generators created
     * by this factory, if any. If null, standard data format specific
     * escapes are used.
     */
    protected CharacterEscapes _characterEscapes;

    
Optional helper object that may decorate input sources, to do
additional processing on input during parsing.
/**
     * Optional helper object that may decorate input sources, to do
     * additional processing on input during parsing.
     */
    protected InputDecorator _inputDecorator;

    
Optional helper object that may decorate output object, to do
additional processing on output during content generation.
/**
     * Optional helper object that may decorate output object, to do
     * additional processing on output during content generation.
     */
    protected OutputDecorator _outputDecorator;

    
Separator used between root-level values, if any; null indicates
"do not add separator".
Default separator is a single space character.
Since:
2.1/**
     * Separator used between root-level values, if any; null indicates
     * "do not add separator".
     * Default separator is a single space character.
     * 
     * @since 2.1
     */
    protected SerializableString _rootValueSeparator = DEFAULT_ROOT_VALUE_SEPARATOR;

    
Optional threshold used for automatically escaping character above certain character code value: either 0 to indicate that no threshold is specified, or value at or above 127 to indicate last character code that is NOT automatically escaped (but depends on other configuration rules for checking). 
Since:
2.10/**
     * Optional threshold used for automatically escaping character above certain character
     * code value: either {@code 0} to indicate that no threshold is specified, or value
     * at or above 127 to indicate last character code that is NOT automatically escaped
     * (but depends on other configuration rules for checking).
     *
     * @since 2.10
     */
    protected int _maximumNonEscapedChar;

    
Character used for quoting field names (if field name quoting has not been disabled with JsonWriteFeature.QUOTE_FIELD_NAMES) and JSON String values. /**
     * Character used for quoting field names (if field name quoting has not
     * been disabled with {@link JsonWriteFeature#QUOTE_FIELD_NAMES})
     * and JSON String values.
     */
    protected final char _quoteChar;

    /*
    /**********************************************************
    /* Construction
    /**********************************************************
     */
    
    
Default constructor used to create factory instances.
Creation of a factory instance is a light-weight operation,
but it is still a good idea to reuse limited number of
factory instances (and quite often just a single instance):
factories are used as context for storing some reused
processing objects (such as symbol tables parsers use)
and this reuse only works within context of a single
factory instance.
/**
     * Default constructor used to create factory instances.
     * Creation of a factory instance is a light-weight operation,
     * but it is still a good idea to reuse limited number of
     * factory instances (and quite often just a single instance):
     * factories are used as context for storing some reused
     * processing objects (such as symbol tables parsers use)
     * and this reuse only works within context of a single
     * factory instance.
     */
    public JsonFactory() { this((ObjectCodec) null); }

    public JsonFactory(ObjectCodec oc) {
        _objectCodec = oc;
        _quoteChar = DEFAULT_QUOTE_CHAR;
    }

    
Constructor used when copy()ing a factory instance.
Since:
2.2.1/**
     * Constructor used when copy()ing a factory instance.
     * 
     * @since 2.2.1
     */
    protected JsonFactory(JsonFactory src, ObjectCodec codec)
    {
        _objectCodec = codec;

        // General
        _factoryFeatures = src._factoryFeatures;
        _parserFeatures = src._parserFeatures;
        _generatorFeatures = src._generatorFeatures;
        _inputDecorator = src._inputDecorator;
        _outputDecorator = src._outputDecorator;

        // JSON-specific
        _characterEscapes = src._characterEscapes;
        _rootValueSeparator = src._rootValueSeparator;
        _maximumNonEscapedChar = src._maximumNonEscapedChar;
        _quoteChar = src._quoteChar;
    }

    
Constructor used by JsonFactoryBuilder for instantiation. 
Since:
2.10/**
     * Constructor used by {@link JsonFactoryBuilder} for instantiation.
     *
     * @since 2.10
     */
    public JsonFactory(JsonFactoryBuilder b) {
        _objectCodec = null;

        // General
        _factoryFeatures = b._factoryFeatures;
        _parserFeatures = b._streamReadFeatures;
        _generatorFeatures = b._streamWriteFeatures;
        _inputDecorator = b._inputDecorator;
        _outputDecorator = b._outputDecorator;

        // JSON-specific
        _characterEscapes = b._characterEscapes;
        _rootValueSeparator = b._rootValueSeparator;
        _maximumNonEscapedChar = b._maximumNonEscapedChar;
        _quoteChar = b._quoteChar;
    }

    
Constructor for subtypes; needed to work around the fact that before 3.0,
this factory has cumbersome dual role as generic type as well as actual
implementation for json.
Params:
b – Builder that contains information
bogus – Argument only needed to separate constructor signature; ignored/**
     * Constructor for subtypes; needed to work around the fact that before 3.0,
     * this factory has cumbersome dual role as generic type as well as actual
     * implementation for json.
     * 
     * @param b Builder that contains information
     * @param bogus Argument only needed to separate constructor signature; ignored
     */
    protected JsonFactory(TSFBuilder<?,?> b, boolean bogus) {
        _objectCodec = null;

        _factoryFeatures = b._factoryFeatures;
        _parserFeatures = b._streamReadFeatures;
        _generatorFeatures = b._streamWriteFeatures;
        _inputDecorator = b._inputDecorator;
        _outputDecorator = b._outputDecorator;

        // JSON-specific: need to assign even if not really used
        _characterEscapes = null;
        _rootValueSeparator = null;
        _maximumNonEscapedChar = 0;
        _quoteChar = DEFAULT_QUOTE_CHAR;
    }

    
Method that allows construction of differently configured factory, starting
with settings of this factory.
Since:
2.10/**
     * Method that allows construction of differently configured factory, starting
     * with settings of this factory.
     *
     * @since 2.10
     */
    public TSFBuilder<?,?> rebuild() {
        // 13-Jun-2018, tatu: Verify sub-classing to prevent strange bugs in format impls
        _requireJSONFactory("Factory implementation for format (%s) MUST override `rebuild()` method");
        return new JsonFactoryBuilder(this);
    }

    
Main factory method to use for constructing JsonFactory instances with different configuration: creates and returns a builder for collecting configuration settings; instance created by calling build() after all configuration set. 

NOTE: signature unfortunately does not expose true implementation type; this
will be fixed in 3.0.
/**
     * Main factory method to use for constructing {@link JsonFactory} instances with
     * different configuration: creates and returns a builder for collecting configuration
     * settings; instance created by calling {@code build()} after all configuration
     * set.
     *<p>
     * NOTE: signature unfortunately does not expose true implementation type; this
     * will be fixed in 3.0.
     */
    public static TSFBuilder<?,?> builder() {
        return new JsonFactoryBuilder();
    }

    
Method for constructing a new JsonFactory that has the same settings as this instance, but is otherwise independent (i.e. nothing is actually shared, symbol tables are separate). Note that ObjectCodec reference is not copied but is set to null; caller typically needs to set it after calling this method. Reason for this is that the codec is used for callbacks, and assumption is that there is strict 1-to-1 mapping between codec, factory. Caller has to, then, explicitly set codec after making the copy. 
Since:
2.1/**
     * Method for constructing a new {@link JsonFactory} that has
     * the same settings as this instance, but is otherwise
     * independent (i.e. nothing is actually shared, symbol tables
     * are separate).
     * Note that {@link ObjectCodec} reference is not copied but is
     * set to null; caller typically needs to set it after calling
     * this method. Reason for this is that the codec is used for
     * callbacks, and assumption is that there is strict 1-to-1
     * mapping between codec, factory. Caller has to, then, explicitly
     * set codec after making the copy.
     * 
     * @since 2.1
     */
    public JsonFactory copy()
    {
        _checkInvalidCopy(JsonFactory.class);
        // as per above, do clear ObjectCodec
        return new JsonFactory(this, null);
    }

    
Since:
2.1/**
     * @since 2.1
     */
    protected void _checkInvalidCopy(Class<?> exp)
    {
        if (getClass() != exp) {
            throw new IllegalStateException("Failed copy(): "+getClass().getName()
                    +" (version: "+version()+") does not override copy(); it has to");
        }
    }

    /*
    /**********************************************************
    /* Serializable overrides
    /**********************************************************
     */

    
Method that we need to override to actually make restoration go
through constructors etc.
Also: must be overridden by sub-classes as well.
/**
     * Method that we need to override to actually make restoration go
     * through constructors etc.
     * Also: must be overridden by sub-classes as well.
     */
    protected Object readResolve() {
        return new JsonFactory(this, _objectCodec);
    }

    /*
    /**********************************************************
    /* Capability introspection
    /**********************************************************
     */

    
Introspection method that higher-level functionality may call
to see whether underlying data format requires a stable ordering
of object properties or not.
This is usually used for determining
whether to force a stable ordering (like alphabetic ordering by name)
if no ordering if explicitly specified.

Default implementation returns false as JSON does NOT
require stable ordering. Formats that require ordering include positional
textual formats like CSV, and schema-based binary formats
like Avro.
Since:
2.3/**
     * Introspection method that higher-level functionality may call
     * to see whether underlying data format requires a stable ordering
     * of object properties or not.
     * This is usually used for determining
     * whether to force a stable ordering (like alphabetic ordering by name)
     * if no ordering if explicitly specified.
     *<p>
     * Default implementation returns <code>false</code> as JSON does NOT
     * require stable ordering. Formats that require ordering include positional
     * textual formats like <code>CSV</code>, and schema-based binary formats
     * like <code>Avro</code>.
     * 
     * @since 2.3
     */
    @Override
    public boolean requiresPropertyOrdering() { return false; }

    
Introspection method that higher-level functionality may call
to see whether underlying data format can read and write binary
data natively; that is, embeded it as-is without using encodings
such as Base64.

Default implementation returns false as JSON does not
support native access: all binary content must use Base64 encoding.
Most binary formats (like Smile and Avro) support native binary content.
Since:
2.3/**
     * Introspection method that higher-level functionality may call
     * to see whether underlying data format can read and write binary
     * data natively; that is, embeded it as-is without using encodings
     * such as Base64.
     *<p>
     * Default implementation returns <code>false</code> as JSON does not
     * support native access: all binary content must use Base64 encoding.
     * Most binary formats (like Smile and Avro) support native binary content.
     * 
     * @since 2.3
     */
    @Override
    public boolean canHandleBinaryNatively() { return false; }

    
Introspection method that can be used by base factory to check
whether access using char[] is something that actual parser implementations can take advantage of, over having to use Reader. Sub-types are expected to override definition; default implementation (suitable for JSON) alleges that optimization are possible; and thereby is likely to try to access String content by first copying it into recyclable intermediate buffer. 
Since:
2.4/**
     * Introspection method that can be used by base factory to check
     * whether access using <code>char[]</code> is something that actual
     * parser implementations can take advantage of, over having to
     * use {@link java.io.Reader}. Sub-types are expected to override
     * definition; default implementation (suitable for JSON) alleges
     * that optimization are possible; and thereby is likely to try
     * to access {@link java.lang.String} content by first copying it into
     * recyclable intermediate buffer.
     * 
     * @since 2.4
     */
    public boolean canUseCharArrays() { return true; }

    
Introspection method that can be used to check whether this factory can create non-blocking parsers: parsers that do not use blocking I/O abstractions but instead use a NonBlockingInputFeeder. 
Since:
2.9/**
     * Introspection method that can be used to check whether this
     * factory can create non-blocking parsers: parsers that do not
     * use blocking I/O abstractions but instead use a
     * {@link com.fasterxml.jackson.core.async.NonBlockingInputFeeder}.
     *
     * @since 2.9
     */
    @Override
    public boolean canParseAsync() {
        // 31-May-2017, tatu: Jackson 2.9 does support async parsing for JSON,
        //   but not all other formats, so need to do this:
        return _isJSONFactory();
    }

    @Override
    public Class<? extends FormatFeature> getFormatReadFeatureType() {
        return null;
    }

    @Override
    public Class<? extends FormatFeature> getFormatWriteFeatureType() {
        return null;
    }

    /*
    /**********************************************************
    /* Format detection functionality
    /**********************************************************
     */

    
Method that can be used to quickly check whether given schema
is something that parsers and/or generators constructed by this
factory could use. Note that this means possible use, at the level
of data format (i.e. schema is for same data format as parsers and
generators this factory constructs); individual schema instances
may have further usage restrictions.
Since:
2.1/**
     * Method that can be used to quickly check whether given schema
     * is something that parsers and/or generators constructed by this
     * factory could use. Note that this means possible use, at the level
     * of data format (i.e. schema is for same data format as parsers and
     * generators this factory constructs); individual schema instances
     * may have further usage restrictions.
     * 
     * @since 2.1
     */
    @Override
    public boolean canUseSchema(FormatSchema schema) {
        if (schema == null){
            return false;
        }
        String ourFormat = getFormatName();
        return (ourFormat != null) && ourFormat.equals(schema.getSchemaType());
    }

    
Method that returns short textual id identifying format
this factory supports.

Note: sub-classes should override this method; default
implementation will return null for all sub-classes
/**
     * Method that returns short textual id identifying format
     * this factory supports.
     *<p>
     * Note: sub-classes should override this method; default
     * implementation will return null for all sub-classes
     */
    @Override
    public String getFormatName()
    {
        /* Somewhat nasty check: since we can't make this abstract
         * (due to backwards compatibility concerns), need to prevent
         * format name "leakage"
         */
        if (getClass() == JsonFactory.class) {
            return FORMAT_NAME_JSON;
        }
        return null;
    }

    
Convenience method for trying to determine whether input via given accessor
is of format type supported by this factory.
/**
     * Convenience method for trying to determine whether input via given accessor
     * is of format type supported by this factory.
     */
    public MatchStrength hasFormat(InputAccessor acc) throws IOException
    {
        // since we can't keep this abstract, only implement for "vanilla" instance
        if (getClass() == JsonFactory.class) {
            return hasJSONFormat(acc);
        }
        return null;
    }

    
Method that can be called to determine if a custom ObjectCodec is needed for binding data parsed using JsonParser constructed by this factory (which typically also implies the same for serialization with JsonGenerator). 
Returns:
True if custom codec is needed with parsers and generators created by this factory; false if a general ObjectCodec is enough
Since:
2.1/**
     * Method that can be called to determine if a custom
     * {@link ObjectCodec} is needed for binding data parsed
     * using {@link JsonParser} constructed by this factory
     * (which typically also implies the same for serialization
     * with {@link JsonGenerator}).
     * 
     * @return True if custom codec is needed with parsers and
     *   generators created by this factory; false if a general
     *   {@link ObjectCodec} is enough
     * 
     * @since 2.1
     */
    public boolean requiresCustomCodec() {
        return false;
    }
    
    
Helper method that can be called to determine if content accessed
using given accessor seems to be JSON content.
/**
     * Helper method that can be called to determine if content accessed
     * using given accessor seems to be JSON content.
     */
    protected MatchStrength hasJSONFormat(InputAccessor acc) throws IOException
    {
        return ByteSourceJsonBootstrapper.hasJSONFormat(acc);
    }

    /*
    /**********************************************************
    /* Versioned
    /**********************************************************
     */

    @Override
    public Version version() {
        return PackageVersion.VERSION;
    }

    /*
    /**********************************************************
    /* Configuration, factory features
    /**********************************************************
     */

    
Method for enabling or disabling specified parser feature (check Feature for list of features) 
Deprecated:
since 2.10 use TSFBuilder<JsonFactory,JsonFactoryBuilder>.configure(Feature, boolean) instead/**
     * Method for enabling or disabling specified parser feature
     * (check {@link JsonParser.Feature} for list of features)
     *
     * @deprecated since 2.10 use {@link JsonFactoryBuilder#configure(JsonFactory.Feature, boolean)} instead
     */
    @Deprecated
    public final JsonFactory configure(JsonFactory.Feature f, boolean state) {
        return state ? enable(f) : disable(f);
    }

    
Method for enabling specified parser feature (check Feature for list of features) 
Deprecated:
since 2.10 use TSFBuilder<JsonFactory,JsonFactoryBuilder>.configure(Feature, boolean) instead/**
     * Method for enabling specified parser feature
     * (check {@link JsonFactory.Feature} for list of features)
     *
     * @deprecated since 2.10 use {@link JsonFactoryBuilder#configure(JsonFactory.Feature, boolean)} instead
     */
    @Deprecated
    public JsonFactory enable(JsonFactory.Feature f) {
        _factoryFeatures |= f.getMask();
        return this;
    }

    
Method for disabling specified parser features (check Feature for list of features) 
Deprecated:
since 2.10 use TSFBuilder<JsonFactory,JsonFactoryBuilder>.configure(Feature, boolean) instead/**
     * Method for disabling specified parser features
     * (check {@link JsonFactory.Feature} for list of features)
     *
     * @deprecated since 2.10 use {@link JsonFactoryBuilder#configure(JsonFactory.Feature, boolean)} instead
     */
    @Deprecated
    public JsonFactory disable(JsonFactory.Feature f) {
        _factoryFeatures &= ~f.getMask();
        return this;
    }

    
Checked whether specified parser feature is enabled.
/**
     * Checked whether specified parser feature is enabled.
     */
    public final boolean isEnabled(JsonFactory.Feature f) {
        return (_factoryFeatures & f.getMask()) != 0;
    }

    @Override
    public final int getParserFeatures() {
        return _parserFeatures;
    }

    @Override
    public final int getGeneratorFeatures() {
        return _generatorFeatures;
    }

    // MUST be overridden by sub-classes that support format-specific parser features
    @Override
    public int getFormatParserFeatures() {
        return 0;
    }

    // MUST be overridden by sub-classes that support format-specific generator features
    @Override
    public int getFormatGeneratorFeatures() {
        return 0;
    }

    /*
    /**********************************************************
    /* Configuration, parser configuration
    /**********************************************************
     */

    
Method for enabling or disabling specified parser feature (check Feature for list of features) /**
     * Method for enabling or disabling specified parser feature
     * (check {@link JsonParser.Feature} for list of features)
     */
    public final JsonFactory configure(JsonParser.Feature f, boolean state) {
        return state ? enable(f) : disable(f);
    }

    
Method for enabling specified parser feature (check Feature for list of features) /**
     * Method for enabling specified parser feature
     * (check {@link JsonParser.Feature} for list of features)
     */
    public JsonFactory enable(JsonParser.Feature f) {
        _parserFeatures |= f.getMask();
        return this;
    }

    
Method for disabling specified parser features (check Feature for list of features) /**
     * Method for disabling specified parser features
     * (check {@link JsonParser.Feature} for list of features)
     */
    public JsonFactory disable(JsonParser.Feature f) {
        _parserFeatures &= ~f.getMask();
        return this;
    }

    
Checked whether specified parser feature is enabled.
/**
     * Checked whether specified parser feature is enabled.
     */
    @Override
    public final boolean isEnabled(JsonParser.Feature f) {
        return (_parserFeatures & f.getMask()) != 0;
    }

    
Since:
2.10/**
     * @since 2.10
     */
    public final boolean isEnabled(StreamReadFeature f) {
        return (_parserFeatures & f.mappedFeature().getMask()) != 0;
    }

    
Method for getting currently configured input decorator (if any;
there is no default decorator).
/**
     * Method for getting currently configured input decorator (if any;
     * there is no default decorator).
     */
    public InputDecorator getInputDecorator() {
        return _inputDecorator;
    }

    
Method for overriding currently configured input decorator
Deprecated:
Since 2.10 use TSFBuilder<JsonFactory,JsonFactoryBuilder>.inputDecorator(InputDecorator) instead/**
     * Method for overriding currently configured input decorator
     *
     * @deprecated Since 2.10 use {@link JsonFactoryBuilder#inputDecorator(InputDecorator)} instead
     */
    @Deprecated
    public JsonFactory setInputDecorator(InputDecorator d) {
        _inputDecorator = d;
        return this;
    }
    
    /*
    /**********************************************************
    /* Configuration, generator settings
    /**********************************************************
     */

    
Method for enabling or disabling specified generator feature (check Feature for list of features) /**
     * Method for enabling or disabling specified generator feature
     * (check {@link JsonGenerator.Feature} for list of features)
     */
    public final JsonFactory configure(JsonGenerator.Feature f, boolean state) {
        return state ? enable(f) : disable(f);
    }

    
Method for enabling specified generator features (check Feature for list of features) /**
     * Method for enabling specified generator features
     * (check {@link JsonGenerator.Feature} for list of features)
     */
    public JsonFactory enable(JsonGenerator.Feature f) {
        _generatorFeatures |= f.getMask();
        return this;
    }

    
Method for disabling specified generator feature (check Feature for list of features) /**
     * Method for disabling specified generator feature
     * (check {@link JsonGenerator.Feature} for list of features)
     */
    public JsonFactory disable(JsonGenerator.Feature f) {
        _generatorFeatures &= ~f.getMask();
        return this;
    }

    
Check whether specified generator feature is enabled.
/**
     * Check whether specified generator feature is enabled.
     */
    @Override
    public final boolean isEnabled(JsonGenerator.Feature f) {
        return (_generatorFeatures & f.getMask()) != 0;
    }

    
Since:
2.10/**
     * @since 2.10
     */
    public final boolean isEnabled(StreamWriteFeature f) {
        return (_generatorFeatures & f.mappedFeature().getMask()) != 0;
    }
    
    
Method for accessing custom escapes factory uses for JsonGenerators it creates. /**
     * Method for accessing custom escapes factory uses for {@link JsonGenerator}s
     * it creates.
     */
    public CharacterEscapes getCharacterEscapes() { return _characterEscapes; }

    
Method for defining custom escapes factory uses for JsonGenerators it creates. /**
     * Method for defining custom escapes factory uses for {@link JsonGenerator}s
     * it creates.
     */
    public JsonFactory setCharacterEscapes(CharacterEscapes esc) {
        _characterEscapes = esc;
        return this;
    }

    
Method for getting currently configured output decorator (if any;
there is no default decorator).
/**
     * Method for getting currently configured output decorator (if any;
     * there is no default decorator).
     */
    public OutputDecorator getOutputDecorator() {
        return _outputDecorator;
    }

    
Method for overriding currently configured output decorator
Deprecated:
Since 2.10 use TSFBuilder<JsonFactory,JsonFactoryBuilder>.inputDecorator(InputDecorator) instead/**
     * Method for overriding currently configured output decorator
     *
     * @deprecated Since 2.10 use {@link JsonFactoryBuilder#inputDecorator(InputDecorator)} instead
     */
    @Deprecated
    public JsonFactory setOutputDecorator(OutputDecorator d) {
        _outputDecorator = d;
        return this;
    }

    
Method that allows overriding String used for separating root-level
JSON values (default is single space character)
Params:
sep – Separator to use, if any; null means that no separator is
  automatically added
Since:
2.1/**
     * Method that allows overriding String used for separating root-level
     * JSON values (default is single space character)
     * 
     * @param sep Separator to use, if any; null means that no separator is
     *   automatically added
     * 
     * @since 2.1
     */
    public JsonFactory setRootValueSeparator(String sep) {
        _rootValueSeparator = (sep == null) ? null : new SerializedString(sep);
        return this;
    }

    
Since:
2.1/**
     * @since 2.1
     */
    public String getRootValueSeparator() {
        return (_rootValueSeparator == null) ? null : _rootValueSeparator.getValue();
    }
    
    /*
    /**********************************************************
    /* Configuration, other
    /**********************************************************
     */

    
Method for associating a ObjectCodec (typically a com.fasterxml.jackson.databind.ObjectMapper) with this factory (and more importantly, parsers and generators it constructs). This is needed to use data-binding methods of JsonParser and JsonGenerator instances. /**
     * Method for associating a {@link ObjectCodec} (typically
     * a <code>com.fasterxml.jackson.databind.ObjectMapper</code>)
     * with this factory (and more importantly, parsers and generators
     * it constructs). This is needed to use data-binding methods
     * of {@link JsonParser} and {@link JsonGenerator} instances.
     */
    public JsonFactory setCodec(ObjectCodec oc) {
        _objectCodec = oc;
        return this;
    }

    public ObjectCodec getCodec() { return _objectCodec; }

    /*
    /**********************************************************
    /* Parser factories, traditional (blocking) I/O sources
    /**********************************************************
     */

    
Method for constructing JSON parser instance to parse
contents of specified file.
 Encoding is auto-detected from contents according to JSON specification recommended mechanism. Json specification supports only UTF-8, UTF-16 and UTF-32 as valid encodings, so auto-detection implemented only for this charsets. For other charsets use createParser(Reader). 

Underlying input stream (needed for reading contents)
will be owned (and managed, i.e. closed as need be) by
the parser, since caller has no access to it.
Params:
f – File that contains JSON content to parse
Since:
2.1/**
     * Method for constructing JSON parser instance to parse
     * contents of specified file.
     *
     *<p>
     * Encoding is auto-detected from contents according to JSON
     * specification recommended mechanism. Json specification
     * supports only UTF-8, UTF-16 and UTF-32 as valid encodings,
     * so auto-detection implemented only for this charsets.
     * For other charsets use {@link #createParser(java.io.Reader)}.
     *
     *<p>
     * Underlying input stream (needed for reading contents)
     * will be <b>owned</b> (and managed, i.e. closed as need be) by
     * the parser, since caller has no access to it.
     *
     * @param f File that contains JSON content to parse
     * 
     * @since 2.1
     */
    @Override
    public JsonParser createParser(File f) throws IOException, JsonParseException {
        // true, since we create InputStream from File
        IOContext ctxt = _createContext(f, true);
        InputStream in = new FileInputStream(f);
        return _createParser(_decorate(in, ctxt), ctxt);
    }

    
Method for constructing JSON parser instance to parse
contents of resource reference by given URL.
 Encoding is auto-detected from contents according to JSON specification recommended mechanism. Json specification supports only UTF-8, UTF-16 and UTF-32 as valid encodings, so auto-detection implemented only for this charsets. For other charsets use createParser(Reader). 

Underlying input stream (needed for reading contents)
will be owned (and managed, i.e. closed as need be) by
the parser, since caller has no access to it.
Params:
url – URL pointing to resource that contains JSON content to parse
Since:
2.1/**
     * Method for constructing JSON parser instance to parse
     * contents of resource reference by given URL.
     *
     *<p>
     * Encoding is auto-detected from contents according to JSON
     * specification recommended mechanism. Json specification
     * supports only UTF-8, UTF-16 and UTF-32 as valid encodings,
     * so auto-detection implemented only for this charsets.
     * For other charsets use {@link #createParser(java.io.Reader)}.
     *
     *<p>
     * Underlying input stream (needed for reading contents)
     * will be <b>owned</b> (and managed, i.e. closed as need be) by
     * the parser, since caller has no access to it.
     *
     * @param url URL pointing to resource that contains JSON content to parse
     * 
     * @since 2.1
     */
    @Override
    public JsonParser createParser(URL url) throws IOException, JsonParseException {
        // true, since we create InputStream from URL
        IOContext ctxt = _createContext(url, true);
        InputStream in = _optimizedStreamFromURL(url);
        return _createParser(_decorate(in, ctxt), ctxt);
    }

    
Method for constructing JSON parser instance to parse
the contents accessed via specified input stream.

The input stream will not be owned by the parser, it will still be managed (i.e. closed if end-of-stream is reacher, or parser close method called) if (and only if) StreamReadFeature.AUTO_CLOSE_SOURCE is enabled. 
 Note: no encoding argument is taken since it can always be auto-detected as suggested by JSON RFC. Json specification supports only UTF-8, UTF-16 and UTF-32 as valid encodings, so auto-detection implemented only for this charsets. For other charsets use createParser(Reader). 
Params:
in – InputStream to use for reading JSON content to parse
Since:
2.1/**
     * Method for constructing JSON parser instance to parse
     * the contents accessed via specified input stream.
     *<p>
     * The input stream will <b>not be owned</b> by
     * the parser, it will still be managed (i.e. closed if
     * end-of-stream is reacher, or parser close method called)
     * if (and only if) {@link com.fasterxml.jackson.core.StreamReadFeature#AUTO_CLOSE_SOURCE}
     * is enabled.
     *<p>
     *
     * Note: no encoding argument is taken since it can always be
     * auto-detected as suggested by JSON RFC. Json specification
     * supports only UTF-8, UTF-16 and UTF-32 as valid encodings,
     * so auto-detection implemented only for this charsets.
     * For other charsets use {@link #createParser(java.io.Reader)}.
     *
     * @param in InputStream to use for reading JSON content to parse
     * 
     * @since 2.1
     */
    @Override
    public JsonParser createParser(InputStream in) throws IOException, JsonParseException {
        IOContext ctxt = _createContext(in, false);
        return _createParser(_decorate(in, ctxt), ctxt);
    }
    
    
Method for constructing parser for parsing
the contents accessed via specified Reader.

The read stream will not be owned by the parser, it will still be managed (i.e. closed if end-of-stream is reacher, or parser close method called) if (and only if) StreamReadFeature.AUTO_CLOSE_SOURCE is enabled. 
Params:
r – Reader to use for reading JSON content to parse
Since:
2.1/**
     * Method for constructing parser for parsing
     * the contents accessed via specified Reader.
     <p>
     * The read stream will <b>not be owned</b> by
     * the parser, it will still be managed (i.e. closed if
     * end-of-stream is reacher, or parser close method called)
     * if (and only if) {@link com.fasterxml.jackson.core.StreamReadFeature#AUTO_CLOSE_SOURCE}
     * is enabled.
     *
     * @param r Reader to use for reading JSON content to parse
     * 
     * @since 2.1
     */
    @Override
    public JsonParser createParser(Reader r) throws IOException, JsonParseException {
        // false -> we do NOT own Reader (did not create it)
        IOContext ctxt = _createContext(r, false);
        return _createParser(_decorate(r, ctxt), ctxt);
    }

    
Method for constructing parser for parsing
the contents of given byte array.
Since:
2.1/**
     * Method for constructing parser for parsing
     * the contents of given byte array.
     * 
     * @since 2.1
     */
    @Override
    public JsonParser createParser(byte[] data) throws IOException, JsonParseException {
        IOContext ctxt = _createContext(data, true);
        if (_inputDecorator != null) {
            InputStream in = _inputDecorator.decorate(ctxt, data, 0, data.length);
            if (in != null) {
                return _createParser(in, ctxt);
            }
        }
        return _createParser(data, 0, data.length, ctxt);
    }

    
Method for constructing parser for parsing
the contents of given byte array.
Params:
data – Buffer that contains data to parse
offset – Offset of the first data byte within buffer
len – Length of contents to parse within buffer
Since:
2.1/**
     * Method for constructing parser for parsing
     * the contents of given byte array.
     * 
     * @param data Buffer that contains data to parse
     * @param offset Offset of the first data byte within buffer
     * @param len Length of contents to parse within buffer
     * 
     * @since 2.1
     */
    @Override
    public JsonParser createParser(byte[] data, int offset, int len) throws IOException, JsonParseException {
        IOContext ctxt = _createContext(data, true);
        // [JACKSON-512]: allow wrapping with InputDecorator
        if (_inputDecorator != null) {
            InputStream in = _inputDecorator.decorate(ctxt, data, offset, len);
            if (in != null) {
                return _createParser(in, ctxt);
            }
        }
        return _createParser(data, offset, len, ctxt);
    }

    
Method for constructing parser for parsing
contents of given String.
Since:
2.1/**
     * Method for constructing parser for parsing
     * contents of given String.
     * 
     * @since 2.1
     */
    @Override
    public JsonParser createParser(String content) throws IOException, JsonParseException {
        final int strLen = content.length();
        // Actually, let's use this for medium-sized content, up to 64kB chunk (32kb char)
        if ((_inputDecorator != null) || (strLen > 0x8000) || !canUseCharArrays()) {
            // easier to just wrap in a Reader than extend InputDecorator; or, if content
            // is too long for us to copy it over
            return createParser(new StringReader(content));
        }
        IOContext ctxt = _createContext(content, true);
        char[] buf = ctxt.allocTokenBuffer(strLen);
        content.getChars(0, strLen, buf, 0);
        return _createParser(buf, 0, strLen, ctxt, true);
    }

    
Method for constructing parser for parsing
contents of given char array.
Since:
2.4/**
     * Method for constructing parser for parsing
     * contents of given char array.
     * 
     * @since 2.4
     */
    @Override
    public JsonParser createParser(char[] content) throws IOException {
        return createParser(content, 0, content.length);
    }
    
    
Method for constructing parser for parsing contents of given char array.
Since:
2.4/**
     * Method for constructing parser for parsing contents of given char array.
     * 
     * @since 2.4
     */
    @Override
    public JsonParser createParser(char[] content, int offset, int len) throws IOException {
        if (_inputDecorator != null) { // easier to just wrap in a Reader than extend InputDecorator
            return createParser(new CharArrayReader(content, offset, len));
        }
        return _createParser(content, offset, len, _createContext(content, true),
                // important: buffer is NOT recyclable, as it's from caller
                false);
    }

    
Optional method for constructing parser for reading contents from specified DataInput instance. 
 If this factory does not support DataInput as source, will throw UnsupportedOperationException 
Since:
2.8/**
     * Optional method for constructing parser for reading contents from specified {@link DataInput}
     * instance.
     *<p>
     * If this factory does not support {@link DataInput} as source,
     * will throw {@link UnsupportedOperationException}
     *
     * @since 2.8
     */
    @Override
    public JsonParser createParser(DataInput in) throws IOException {
        IOContext ctxt = _createContext(in, false);
        return _createParser(_decorate(in, ctxt), ctxt);
    }

    /*
    /**********************************************************
    /* Parser factories, non-blocking (async) sources
    /**********************************************************
     */

    
Optional method for constructing parser for non-blocking parsing via ByteArrayFeeder interface (accessed using JsonParser.getNonBlockingInputFeeder() from constructed instance). 
 If this factory does not support non-blocking parsing (either at all, or from byte array), will throw UnsupportedOperationException. 

Note that JSON-backed factory only supports parsing of UTF-8 encoded JSON content
(and US-ASCII since it is proper subset); other encodings are not supported
at this point.
Since:
2.9/**
     * Optional method for constructing parser for non-blocking parsing
     * via {@link com.fasterxml.jackson.core.async.ByteArrayFeeder}
     * interface (accessed using {@link JsonParser#getNonBlockingInputFeeder()}
     * from constructed instance).
     *<p>
     * If this factory does not support non-blocking parsing (either at all,
     * or from byte array),
     * will throw {@link UnsupportedOperationException}.
     *<p>
     * Note that JSON-backed factory only supports parsing of UTF-8 encoded JSON content
     * (and US-ASCII since it is proper subset); other encodings are not supported
     * at this point.
     *
     * @since 2.9
     */
    @Override
    public JsonParser createNonBlockingByteArrayParser() throws IOException
    {
        // 17-May-2017, tatu: Need to take care not to accidentally create JSON parser
        //   for non-JSON input:
        _requireJSONFactory("Non-blocking source not (yet?) supported for this format (%s)");
        IOContext ctxt = _createNonBlockingContext(null);
        ByteQuadsCanonicalizer can = _byteSymbolCanonicalizer.makeChild(_factoryFeatures);
        return new NonBlockingJsonParser(ctxt, _parserFeatures, can);
    }

    /*
    /**********************************************************
    /* Generator factories
    /**********************************************************
     */

    
Method for constructing JSON generator for writing JSON content
using specified output stream.
Encoding to use must be specified, and needs to be one of available
types (as per JSON specification).

Underlying stream is NOT owned by the generator constructed, so that generator will NOT close the output stream when JsonGenerator.close is called (unless auto-closing feature, Feature.AUTO_CLOSE_TARGET is enabled). Using application needs to close it explicitly if this is the case. 

Note: there are formats that use fixed encoding (like most binary data formats)
and that ignore passed in encoding.
Params:
out – OutputStream to use for writing JSON content
enc – Character encoding to use
Since:
2.1/**
     * Method for constructing JSON generator for writing JSON content
     * using specified output stream.
     * Encoding to use must be specified, and needs to be one of available
     * types (as per JSON specification).
     *<p>
     * Underlying stream <b>is NOT owned</b> by the generator constructed,
     * so that generator will NOT close the output stream when
     * {@link JsonGenerator#close} is called (unless auto-closing
     * feature,
     * {@link com.fasterxml.jackson.core.JsonGenerator.Feature#AUTO_CLOSE_TARGET}
     * is enabled).
     * Using application needs to close it explicitly if this is the case.
     *<p>
     * Note: there are formats that use fixed encoding (like most binary data formats)
     * and that ignore passed in encoding.
     *
     * @param out OutputStream to use for writing JSON content 
     * @param enc Character encoding to use
     * 
     * @since 2.1
     */
    @Override
    public JsonGenerator createGenerator(OutputStream out, JsonEncoding enc)
        throws IOException
    {
        // false -> we won't manage the stream unless explicitly directed to
        IOContext ctxt = _createContext(out, false);
        ctxt.setEncoding(enc);
        if (enc == JsonEncoding.UTF8) {
            return _createUTF8Generator(_decorate(out, ctxt), ctxt);
        }
        Writer w = _createWriter(out, enc, ctxt);
        return _createGenerator(_decorate(w, ctxt), ctxt);
    }

    
Convenience method for constructing generator that uses default
encoding of the format (UTF-8 for JSON and most other data formats).

Note: there are formats that use fixed encoding (like most binary data formats).
Since:
2.1/**
     * Convenience method for constructing generator that uses default
     * encoding of the format (UTF-8 for JSON and most other data formats).
     *<p>
     * Note: there are formats that use fixed encoding (like most binary data formats).
     * 
     * @since 2.1
     */
    @Override
    public JsonGenerator createGenerator(OutputStream out) throws IOException {
        return createGenerator(out, JsonEncoding.UTF8);
    }
    
    
Method for constructing JSON generator for writing JSON content
using specified Writer.

Underlying stream is NOT owned by the generator constructed, so that generator will NOT close the Reader when JsonGenerator.close is called (unless auto-closing feature, Feature.AUTO_CLOSE_TARGET is enabled). Using application needs to close it explicitly. 
Params:
w – Writer to use for writing JSON content
Since:
2.1/**
     * Method for constructing JSON generator for writing JSON content
     * using specified Writer.
     *<p>
     * Underlying stream <b>is NOT owned</b> by the generator constructed,
     * so that generator will NOT close the Reader when
     * {@link JsonGenerator#close} is called (unless auto-closing
     * feature,
     * {@link com.fasterxml.jackson.core.JsonGenerator.Feature#AUTO_CLOSE_TARGET} is enabled).
     * Using application needs to close it explicitly.
     * 
     * @since 2.1
     *
     * @param w Writer to use for writing JSON content 
     */
    @Override
    public JsonGenerator createGenerator(Writer w) throws IOException {
        IOContext ctxt = _createContext(w, false);
        return _createGenerator(_decorate(w, ctxt), ctxt);
    }
    
    
Method for constructing JSON generator for writing JSON content
to specified file, overwriting contents it might have (or creating
it if such file does not yet exist).
Encoding to use must be specified, and needs to be one of available
types (as per JSON specification).

Underlying stream is owned by the generator constructed, i.e. generator will handle closing of file when JsonGenerator.close is called. 
Params:
f – File to write contents to
enc – Character encoding to use
Since:
2.1/**
     * Method for constructing JSON generator for writing JSON content
     * to specified file, overwriting contents it might have (or creating
     * it if such file does not yet exist).
     * Encoding to use must be specified, and needs to be one of available
     * types (as per JSON specification).
     *<p>
     * Underlying stream <b>is owned</b> by the generator constructed,
     * i.e. generator will handle closing of file when
     * {@link JsonGenerator#close} is called.
     *
     * @param f File to write contents to
     * @param enc Character encoding to use
     * 
     * @since 2.1
     */
    @Override
    public JsonGenerator createGenerator(File f, JsonEncoding enc) throws IOException
    {
        OutputStream out = new FileOutputStream(f);
        // true -> yes, we have to manage the stream since we created it
        IOContext ctxt = _createContext(out, true);
        ctxt.setEncoding(enc);
        if (enc == JsonEncoding.UTF8) {
            return _createUTF8Generator(_decorate(out, ctxt), ctxt);
        }
        Writer w = _createWriter(out, enc, ctxt);
        return _createGenerator(_decorate(w, ctxt), ctxt);
    }    

    
Method for constructing generator for writing content using specified DataOutput instance. 
Since:
2.8/**
     * Method for constructing generator for writing content using specified
     * {@link DataOutput} instance.
     * 
     * @since 2.8
     */
    @Override
    public JsonGenerator createGenerator(DataOutput out, JsonEncoding enc) throws IOException {
        return createGenerator(_createDataOutputWrapper(out), enc);
    }

    
Convenience method for constructing generator that uses default
encoding of the format (UTF-8 for JSON and most other data formats).

Note: there are formats that use fixed encoding (like most binary data formats).
Since:
2.8/**
     * Convenience method for constructing generator that uses default
     * encoding of the format (UTF-8 for JSON and most other data formats).
     *<p>
     * Note: there are formats that use fixed encoding (like most binary data formats).
     * 
     * @since 2.8
     */
    @Override
    public JsonGenerator createGenerator(DataOutput out) throws IOException {
        return createGenerator(_createDataOutputWrapper(out), JsonEncoding.UTF8);
    }

    /*
    /**********************************************************
    /* Deprecated parser factory methods: to be removed from 3.x
    /**********************************************************
     */

    
Method for constructing JSON parser instance to parse
contents of specified file.
 Encoding is auto-detected from contents according to JSON specification recommended mechanism. Json specification supports only UTF-8, UTF-16 and UTF-32 as valid encodings, so auto-detection implemented only for this charsets. For other charsets use createParser(Reader). 

Underlying input stream (needed for reading contents)
will be owned (and managed, i.e. closed as need be) by
the parser, since caller has no access to it.
Params:
f – File that contains JSON content to parse
Deprecated:
Since 2.2, use createParser(File) instead./**
     * Method for constructing JSON parser instance to parse
     * contents of specified file.
     *<p>
     * Encoding is auto-detected from contents according to JSON
     * specification recommended mechanism. Json specification
     * supports only UTF-8, UTF-16 and UTF-32 as valid encodings,
     * so auto-detection implemented only for this charsets.
     * For other charsets use {@link #createParser(java.io.Reader)}.
     *
     *<p>
     * Underlying input stream (needed for reading contents)
     * will be <b>owned</b> (and managed, i.e. closed as need be) by
     * the parser, since caller has no access to it.
     *
     * @param f File that contains JSON content to parse
     * 
     * @deprecated Since 2.2, use {@link #createParser(File)} instead.
     */
    @Deprecated
    public JsonParser createJsonParser(File f) throws IOException, JsonParseException {
        return createParser(f);
    }

    
Method for constructing JSON parser instance to parse
contents of resource reference by given URL.
 Encoding is auto-detected from contents according to JSON specification recommended mechanism. Json specification supports only UTF-8, UTF-16 and UTF-32 as valid encodings, so auto-detection implemented only for this charsets. For other charsets use createParser(Reader). 

Underlying input stream (needed for reading contents)
will be owned (and managed, i.e. closed as need be) by
the parser, since caller has no access to it.
Params:
url – URL pointing to resource that contains JSON content to parse
Deprecated:
Since 2.2, use createParser(URL) instead./**
     * Method for constructing JSON parser instance to parse
     * contents of resource reference by given URL.
     *
     *<p>
     * Encoding is auto-detected from contents according to JSON
     * specification recommended mechanism. Json specification
     * supports only UTF-8, UTF-16 and UTF-32 as valid encodings,
     * so auto-detection implemented only for this charsets.
     * For other charsets use {@link #createParser(java.io.Reader)}.
     *
     *<p>
     * Underlying input stream (needed for reading contents)
     * will be <b>owned</b> (and managed, i.e. closed as need be) by
     * the parser, since caller has no access to it.
     *
     * @param url URL pointing to resource that contains JSON content to parse
     * 
     * @deprecated Since 2.2, use {@link #createParser(URL)} instead.
     */
    @Deprecated
    public JsonParser createJsonParser(URL url) throws IOException, JsonParseException {
        return createParser(url);
    }

    
Method for constructing JSON parser instance to parse
the contents accessed via specified input stream.

The input stream will not be owned by the parser, it will still be managed (i.e. closed if end-of-stream is reacher, or parser close method called) if (and only if) Feature.AUTO_CLOSE_SOURCE is enabled. 
 Note: no encoding argument is taken since it can always be auto-detected as suggested by JSON RFC. Json specification supports only UTF-8, UTF-16 and UTF-32 as valid encodings, so auto-detection implemented only for this charsets. For other charsets use createParser(Reader). 
Params:
in – InputStream to use for reading JSON content to parse
Deprecated:
Since 2.2, use createParser(InputStream) instead./**
     * Method for constructing JSON parser instance to parse
     * the contents accessed via specified input stream.
     *<p>
     * The input stream will <b>not be owned</b> by
     * the parser, it will still be managed (i.e. closed if
     * end-of-stream is reacher, or parser close method called)
     * if (and only if) {@link com.fasterxml.jackson.core.JsonParser.Feature#AUTO_CLOSE_SOURCE}
     * is enabled.
     *<p>
     *
     * Note: no encoding argument is taken since it can always be
     * auto-detected as suggested by JSON RFC. Json specification
     * supports only UTF-8, UTF-16 and UTF-32 as valid encodings,
     * so auto-detection implemented only for this charsets.
     * For other charsets use {@link #createParser(java.io.Reader)}.
     *
     * @param in InputStream to use for reading JSON content to parse
     * 
     * @deprecated Since 2.2, use {@link #createParser(InputStream)} instead.
     */
    @Deprecated
    public JsonParser createJsonParser(InputStream in) throws IOException, JsonParseException {
        return createParser(in);
    }

    
Method for constructing parser for parsing
the contents accessed via specified Reader.

The read stream will not be owned by the parser, it will still be managed (i.e. closed if end-of-stream is reacher, or parser close method called) if (and only if) Feature.AUTO_CLOSE_SOURCE is enabled. 
Params:
r – Reader to use for reading JSON content to parse
Deprecated:
Since 2.2, use createParser(Reader) instead./**
     * Method for constructing parser for parsing
     * the contents accessed via specified Reader.
     <p>
     * The read stream will <b>not be owned</b> by
     * the parser, it will still be managed (i.e. closed if
     * end-of-stream is reacher, or parser close method called)
     * if (and only if) {@link com.fasterxml.jackson.core.JsonParser.Feature#AUTO_CLOSE_SOURCE}
     * is enabled.
     *
     * @param r Reader to use for reading JSON content to parse
     * 
     * @deprecated Since 2.2, use {@link #createParser(Reader)} instead.
     */
    @Deprecated
    public JsonParser createJsonParser(Reader r) throws IOException, JsonParseException {
        return createParser(r);
    }

    
Method for constructing parser for parsing the contents of given byte array.
Deprecated:
Since 2.2, use createParser(byte[]) instead./**
     * Method for constructing parser for parsing the contents of given byte array.
     * 
     * @deprecated Since 2.2, use {@link #createParser(byte[])} instead.
     */
    @Deprecated
    public JsonParser createJsonParser(byte[] data) throws IOException, JsonParseException {
        return createParser(data);
    }

    
Method for constructing parser for parsing
the contents of given byte array.
Params:
data – Buffer that contains data to parse
offset – Offset of the first data byte within buffer
len – Length of contents to parse within buffer
Deprecated:
Since 2.2, use createParser(byte[], int, int) instead./**
     * Method for constructing parser for parsing
     * the contents of given byte array.
     * 
     * @param data Buffer that contains data to parse
     * @param offset Offset of the first data byte within buffer
     * @param len Length of contents to parse within buffer
     * 
     * @deprecated Since 2.2, use {@link #createParser(byte[],int,int)} instead.
     */
    @Deprecated
    public JsonParser createJsonParser(byte[] data, int offset, int len) throws IOException, JsonParseException {
        return createParser(data, offset, len);
    }

    
Method for constructing parser for parsing
contents of given String.
Deprecated:
Since 2.2, use createParser(String) instead./**
     * Method for constructing parser for parsing
     * contents of given String.
     * 
     * @deprecated Since 2.2, use {@link #createParser(String)} instead.
     */
    @Deprecated
    public JsonParser createJsonParser(String content) throws IOException, JsonParseException {
        return createParser(content);
    }

    /*
    /**********************************************************
    /* Deprecated generator factory methods: to be removed from 3.x
    /**********************************************************
     */

    
Method for constructing JSON generator for writing JSON content
using specified output stream.
Encoding to use must be specified, and needs to be one of available
types (as per JSON specification).

Underlying stream is NOT owned by the generator constructed, so that generator will NOT close the output stream when JsonGenerator.close is called (unless auto-closing feature, Feature.AUTO_CLOSE_TARGET is enabled). Using application needs to close it explicitly if this is the case. 

Note: there are formats that use fixed encoding (like most binary data formats)
and that ignore passed in encoding.
Params:
out – OutputStream to use for writing JSON content
enc – Character encoding to use
Deprecated:
Since 2.2, use createGenerator(OutputStream, JsonEncoding) instead./**
     * Method for constructing JSON generator for writing JSON content
     * using specified output stream.
     * Encoding to use must be specified, and needs to be one of available
     * types (as per JSON specification).
     *<p>
     * Underlying stream <b>is NOT owned</b> by the generator constructed,
     * so that generator will NOT close the output stream when
     * {@link JsonGenerator#close} is called (unless auto-closing
     * feature,
     * {@link com.fasterxml.jackson.core.JsonGenerator.Feature#AUTO_CLOSE_TARGET}
     * is enabled).
     * Using application needs to close it explicitly if this is the case.
     *<p>
     * Note: there are formats that use fixed encoding (like most binary data formats)
     * and that ignore passed in encoding.
     *
     * @param out OutputStream to use for writing JSON content 
     * @param enc Character encoding to use
     *
     * @deprecated Since 2.2, use {@link #createGenerator(OutputStream, JsonEncoding)} instead.
     */
    @Deprecated
    public JsonGenerator createJsonGenerator(OutputStream out, JsonEncoding enc) throws IOException {
        return createGenerator(out, enc);
    }

    
Method for constructing JSON generator for writing JSON content
using specified Writer.

Underlying stream is NOT owned by the generator constructed, so that generator will NOT close the Reader when JsonGenerator.close is called (unless auto-closing feature, Feature.AUTO_CLOSE_TARGET is enabled). Using application needs to close it explicitly. 
Params:
out – Writer to use for writing JSON content
Deprecated:
Since 2.2, use createGenerator(Writer) instead./**
     * Method for constructing JSON generator for writing JSON content
     * using specified Writer.
     *<p>
     * Underlying stream <b>is NOT owned</b> by the generator constructed,
     * so that generator will NOT close the Reader when
     * {@link JsonGenerator#close} is called (unless auto-closing
     * feature,
     * {@link com.fasterxml.jackson.core.JsonGenerator.Feature#AUTO_CLOSE_TARGET} is enabled).
     * Using application needs to close it explicitly.
     *
     * @param out Writer to use for writing JSON content 
     * 
     * @deprecated Since 2.2, use {@link #createGenerator(Writer)} instead.
     */
    @Deprecated
    public JsonGenerator createJsonGenerator(Writer out) throws IOException {
        return createGenerator(out);
    }

    
Convenience method for constructing generator that uses default
encoding of the format (UTF-8 for JSON and most other data formats).

Note: there are formats that use fixed encoding (like most binary data formats).
Deprecated:
Since 2.2, use createGenerator(OutputStream) instead./**
     * Convenience method for constructing generator that uses default
     * encoding of the format (UTF-8 for JSON and most other data formats).
     *<p>
     * Note: there are formats that use fixed encoding (like most binary data formats).
     * 
     * @deprecated Since 2.2, use {@link #createGenerator(OutputStream)} instead.
     */
    @Deprecated
    public JsonGenerator createJsonGenerator(OutputStream out) throws IOException {
        return createGenerator(out, JsonEncoding.UTF8);
    }

    /*
    /**********************************************************
    /* Factory methods used by factory for creating parser instances,
    /* overridable by sub-classes
    /**********************************************************
     */

    
Overridable factory method that actually instantiates desired parser given InputStream and context object. 

This method is specifically designed to remain
compatible between minor versions so that sub-classes can count
on it being called as expected. That is, it is part of official
interface from sub-class perspective, although not a public
method available to users of factory implementations.
Since:
2.1/**
     * Overridable factory method that actually instantiates desired parser
     * given {@link InputStream} and context object.
     *<p>
     * This method is specifically designed to remain
     * compatible between minor versions so that sub-classes can count
     * on it being called as expected. That is, it is part of official
     * interface from sub-class perspective, although not a public
     * method available to users of factory implementations.
     * 
     * @since 2.1
     */
    protected JsonParser _createParser(InputStream in, IOContext ctxt) throws IOException {
        // As per [JACKSON-259], may want to fully disable canonicalization:
        return new ByteSourceJsonBootstrapper(ctxt, in).constructParser(_parserFeatures,
                _objectCodec, _byteSymbolCanonicalizer, _rootCharSymbols, _factoryFeatures);
    }

    
Overridable factory method that actually instantiates parser using given Reader object for reading content. 

This method is specifically designed to remain
compatible between minor versions so that sub-classes can count
on it being called as expected. That is, it is part of official
interface from sub-class perspective, although not a public
method available to users of factory implementations.
Since:
2.1/**
     * Overridable factory method that actually instantiates parser
     * using given {@link Reader} object for reading content.
     *<p>
     * This method is specifically designed to remain
     * compatible between minor versions so that sub-classes can count
     * on it being called as expected. That is, it is part of official
     * interface from sub-class perspective, although not a public
     * method available to users of factory implementations.
     * 
     * @since 2.1
     */
    protected JsonParser _createParser(Reader r, IOContext ctxt) throws IOException {
        return new ReaderBasedJsonParser(ctxt, _parserFeatures, r, _objectCodec,
                _rootCharSymbols.makeChild(_factoryFeatures));
    }

    
Overridable factory method that actually instantiates parser
using given char[] object for accessing content.
Since:
2.4/**
     * Overridable factory method that actually instantiates parser
     * using given <code>char[]</code> object for accessing content.
     * 
     * @since 2.4
     */
    protected JsonParser _createParser(char[] data, int offset, int len, IOContext ctxt,
            boolean recyclable) throws IOException {
        return new ReaderBasedJsonParser(ctxt, _parserFeatures, null, _objectCodec,
                _rootCharSymbols.makeChild(_factoryFeatures),
                        data, offset, offset+len, recyclable);
    }

    
Overridable factory method that actually instantiates parser using given Reader object for reading content passed as raw byte array. 

This method is specifically designed to remain
compatible between minor versions so that sub-classes can count
on it being called as expected. That is, it is part of official
interface from sub-class perspective, although not a public
method available to users of factory implementations.
/**
     * Overridable factory method that actually instantiates parser
     * using given {@link Reader} object for reading content
     * passed as raw byte array.
     *<p>
     * This method is specifically designed to remain
     * compatible between minor versions so that sub-classes can count
     * on it being called as expected. That is, it is part of official
     * interface from sub-class perspective, although not a public
     * method available to users of factory implementations.
     */
    protected JsonParser _createParser(byte[] data, int offset, int len, IOContext ctxt) throws IOException
    {
        return new ByteSourceJsonBootstrapper(ctxt, data, offset, len).constructParser(_parserFeatures,
                _objectCodec, _byteSymbolCanonicalizer, _rootCharSymbols, _factoryFeatures);
    }

    
Optional factory method, expected to be overridden
Since:
2.8/**
     * Optional factory method, expected to be overridden
     *
     * @since 2.8
     */
    protected JsonParser _createParser(DataInput input, IOContext ctxt) throws IOException
    {
        // 13-May-2016, tatu: Need to take care not to accidentally create JSON parser for
        //   non-JSON input.
        _requireJSONFactory("InputData source not (yet?) supported for this format (%s)");
        // Also: while we can't do full bootstrapping (due to read-ahead limitations), should
        // at least handle possible UTF-8 BOM
        int firstByte = ByteSourceJsonBootstrapper.skipUTF8BOM(input);
        ByteQuadsCanonicalizer can = _byteSymbolCanonicalizer.makeChild(_factoryFeatures);
        return new UTF8DataInputJsonParser(ctxt, _parserFeatures, input,
                _objectCodec, can, firstByte);
    }

    /*
    /**********************************************************
    /* Factory methods used by factory for creating generator instances,
    /* overridable by sub-classes
    /**********************************************************
     */
    
    
Overridable factory method that actually instantiates generator for given Writer and context object. 

This method is specifically designed to remain
compatible between minor versions so that sub-classes can count
on it being called as expected. That is, it is part of official
interface from sub-class perspective, although not a public
method available to users of factory implementations.
/**
     * Overridable factory method that actually instantiates generator for
     * given {@link Writer} and context object.
     *<p>
     * This method is specifically designed to remain
     * compatible between minor versions so that sub-classes can count
     * on it being called as expected. That is, it is part of official
     * interface from sub-class perspective, although not a public
     * method available to users of factory implementations.
     */
    protected JsonGenerator _createGenerator(Writer out, IOContext ctxt) throws IOException
    {
        WriterBasedJsonGenerator gen = new WriterBasedJsonGenerator(ctxt,
                _generatorFeatures, _objectCodec, out, _quoteChar);
        if (_maximumNonEscapedChar > 0) {
            gen.setHighestNonEscapedChar(_maximumNonEscapedChar);
        }
        if (_characterEscapes != null) {
            gen.setCharacterEscapes(_characterEscapes);
        }
        SerializableString rootSep = _rootValueSeparator;
        if (rootSep != DEFAULT_ROOT_VALUE_SEPARATOR) {
            gen.setRootValueSeparator(rootSep);
        }
        return gen;
    }

    
Overridable factory method that actually instantiates generator for given OutputStream and context object, using UTF-8 encoding. 

This method is specifically designed to remain
compatible between minor versions so that sub-classes can count
on it being called as expected. That is, it is part of official
interface from sub-class perspective, although not a public
method available to users of factory implementations.
/**
     * Overridable factory method that actually instantiates generator for
     * given {@link OutputStream} and context object, using UTF-8 encoding.
     *<p>
     * This method is specifically designed to remain
     * compatible between minor versions so that sub-classes can count
     * on it being called as expected. That is, it is part of official
     * interface from sub-class perspective, although not a public
     * method available to users of factory implementations.
     */
    protected JsonGenerator _createUTF8Generator(OutputStream out, IOContext ctxt) throws IOException {
        UTF8JsonGenerator gen = new UTF8JsonGenerator(ctxt,
                _generatorFeatures, _objectCodec, out, _quoteChar);
        if (_maximumNonEscapedChar > 0) {
            gen.setHighestNonEscapedChar(_maximumNonEscapedChar);
        }
        if (_characterEscapes != null) {
            gen.setCharacterEscapes(_characterEscapes);
        }
        SerializableString rootSep = _rootValueSeparator;
        if (rootSep != DEFAULT_ROOT_VALUE_SEPARATOR) {
            gen.setRootValueSeparator(rootSep);
        }
        return gen;
    }

    protected Writer _createWriter(OutputStream out, JsonEncoding enc, IOContext ctxt) throws IOException
    {
        // note: this should not get called any more (caller checks, dispatches)
        if (enc == JsonEncoding.UTF8) { // We have optimized writer for UTF-8
            return new UTF8Writer(ctxt, out);
        }
        // not optimal, but should do unless we really care about UTF-16/32 encoding speed
        return new OutputStreamWriter(out, enc.getJavaName());
    }

    /*
    /**********************************************************
    /* Internal factory methods, decorator handling
    /**********************************************************
     */

    
Since:
2.4/**
     * @since 2.4
     */
    protected final InputStream _decorate(InputStream in, IOContext ctxt) throws IOException {
        if (_inputDecorator != null) {
            InputStream in2 = _inputDecorator.decorate(ctxt, in);
            if (in2 != null) {
                return in2;
            }
        }
        return in;
    }

    
Since:
2.4/**
     * @since 2.4
     */
    protected final Reader _decorate(Reader in, IOContext ctxt) throws IOException {
        if (_inputDecorator != null) {
            Reader in2 = _inputDecorator.decorate(ctxt, in);
            if (in2 != null) {
                return in2;
            }
        }
        return in;
    }

    
Since:
2.8/**
     * @since 2.8
     */
    protected final DataInput _decorate(DataInput in, IOContext ctxt) throws IOException {
        if (_inputDecorator != null) {
            DataInput in2 = _inputDecorator.decorate(ctxt, in);
            if (in2 != null) {
                return in2;
            }
        }
        return in;
    }
    
    
Since:
2.4/**
     * @since 2.4
     */
    protected final OutputStream _decorate(OutputStream out, IOContext ctxt) throws IOException {
        if (_outputDecorator != null) {
            OutputStream out2 = _outputDecorator.decorate(ctxt, out);
            if (out2 != null) {
                return out2;
            }
        }
        return out;
    }

    
Since:
2.4/**
     * @since 2.4
     */
    protected final Writer _decorate(Writer out, IOContext ctxt) throws IOException {
        if (_outputDecorator != null) {
            Writer out2 = _outputDecorator.decorate(ctxt, out);
            if (out2 != null) {
                return out2;
            }
        }
        return out;
    }

    /*
    /**********************************************************
    /* Internal factory methods, other
    /**********************************************************
     */

    
Method used by factory to create buffer recycler instances
for parsers and generators.

Note: only public to give access for ObjectMapper
/**
     * Method used by factory to create buffer recycler instances
     * for parsers and generators.
     *<p>
     * Note: only public to give access for <code>ObjectMapper</code>
     */
    public BufferRecycler _getBufferRecycler()
    {
        /* 23-Apr-2015, tatu: Let's allow disabling of buffer recycling
         *   scheme, for cases where it is considered harmful (possibly
         *   on Android, for example)
         */
        if (Feature.USE_THREAD_LOCAL_FOR_BUFFER_RECYCLING.enabledIn(_factoryFeatures)) {
            return BufferRecyclers.getBufferRecycler();
        }
        return new BufferRecycler();
    }

    
Overridable factory method that actually instantiates desired
context object.
/**
     * Overridable factory method that actually instantiates desired
     * context object.
     */
    protected IOContext _createContext(Object srcRef, boolean resourceManaged) {
        return new IOContext(_getBufferRecycler(), srcRef, resourceManaged);
    }

    
Overridable factory method that actually instantiates desired
context object for async (non-blocking) parsing
Since:
2.9.7/**
     * Overridable factory method that actually instantiates desired
     * context object for async (non-blocking) parsing
     *
     * @since 2.9.7
     */
    protected IOContext _createNonBlockingContext(Object srcRef) {
        // [jackson-core#479]: allow recycling for non-blocking parser again
        // now that access is thread-safe
        return new IOContext(_getBufferRecycler(), srcRef, false);
    }

    /*
    /**********************************************************
    /* Internal helper methods
    /**********************************************************
     */

    
Helper method called to work around the problem of this class both defining
general API for constructing parsers+generators AND implementing the API
for JSON handling. Problem here is that when adding new functionality
via factory methods, it is not possible to leave these methods abstract
(because we are implementing them for JSON); but there is risk that
sub-classes do not override them all (plus older version can not implement).
So a work-around is to add a check to ensure that factory is still one
used for JSON; and if not, make base implementation of a factory method fail.
Since:
2.9/**
     * Helper method called to work around the problem of this class both defining
     * general API for constructing parsers+generators AND implementing the API
     * for JSON handling. Problem here is that when adding new functionality
     * via factory methods, it is not possible to leave these methods abstract
     * (because we are implementing them for JSON); but there is risk that
     * sub-classes do not override them all (plus older version can not implement).
     * So a work-around is to add a check to ensure that factory is still one
     * used for JSON; and if not, make base implementation of a factory method fail.
     *
     * @since 2.9
     */
    private final void _requireJSONFactory(String msg) {
        if (!_isJSONFactory()) {
            throw new UnsupportedOperationException(String.format(msg, getFormatName()));
        }
    }

    private final boolean _isJSONFactory() {
        // NOTE: since we only really care about whether this is standard JSON-backed factory,
        // or its sub-class / delegated to one, no need to check for equality, identity is enough
        return getFormatName() == FORMAT_NAME_JSON;
    }
}