package com.fasterxml.jackson.core.util;

import java.io.*;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.io.SerializedString;

Default PrettyPrinter implementation that uses 2-space indentation with platform-default linefeeds. Usually this class is not instantiated directly, but instead method JsonGenerator.useDefaultPrettyPrinter is used, which will use an instance of this class for operation. /**
 * Default {@link PrettyPrinter} implementation that uses 2-space
 * indentation with platform-default linefeeds.
 * Usually this class is not instantiated directly, but instead
 * method {@link JsonGenerator#useDefaultPrettyPrinter} is
 * used, which will use an instance of this class for operation.
 */
@SuppressWarnings("serial")
public class DefaultPrettyPrinter
    implements PrettyPrinter, Instantiatable<DefaultPrettyPrinter>,
        java.io.Serializable
{
    private static final long serialVersionUID = 1;

    
Constant that specifies default "root-level" separator to use between
root values: a single space character.
Since:
2.1/**
     * Constant that specifies default "root-level" separator to use between
     * root values: a single space character.
     * 
     * @since 2.1
     */
    public final static SerializedString DEFAULT_ROOT_VALUE_SEPARATOR = new SerializedString(" ");

    
Interface that defines objects that can produce indentation used
to separate object entries and array values. Indentation in this
context just means insertion of white space, independent of whether
linefeeds are output.
/**
     * Interface that defines objects that can produce indentation used
     * to separate object entries and array values. Indentation in this
     * context just means insertion of white space, independent of whether
     * linefeeds are output.
     */
    public interface Indenter
    {
        void writeIndentation(JsonGenerator g, int level) throws IOException;

        
Returns:
True if indenter is considered inline (does not add linefeeds),
  false otherwise/**
         * @return True if indenter is considered inline (does not add linefeeds),
         *   false otherwise
         */
        boolean isInline();
    }

    // // // Config, indentation

    
By default, let's use only spaces to separate array values.
/**
     * By default, let's use only spaces to separate array values.
     */
    protected Indenter _arrayIndenter = FixedSpaceIndenter.instance;

    
By default, let's use linefeed-adding indenter for separate
object entries. We'll further configure indenter to use
system-specific linefeeds, and 2 spaces per level (as opposed to,
say, single tabs)
/**
     * By default, let's use linefeed-adding indenter for separate
     * object entries. We'll further configure indenter to use
     * system-specific linefeeds, and 2 spaces per level (as opposed to,
     * say, single tabs)
     */
    protected Indenter _objectIndenter = DefaultIndenter.SYSTEM_LINEFEED_INSTANCE;

    
String printed between root-level values, if any.
/**
     * String printed between root-level values, if any.
     */
    protected final SerializableString _rootSeparator;

    // // // Config, other white space configuration

    
By default we will add spaces around colons used to
separate object fields and values.
If disabled, will not use spaces around colon.
/**
     * By default we will add spaces around colons used to
     * separate object fields and values.
     * If disabled, will not use spaces around colon.
     */
    protected boolean _spacesInObjectEntries = true;

    // // // State:

    
Number of open levels of nesting. Used to determine amount of
indentation to use.
/**
     * Number of open levels of nesting. Used to determine amount of
     * indentation to use.
     */
    protected transient int _nesting;

    
Since:
2.9/**
     * @since 2.9
     */
    protected Separators _separators;

    
Since:
2.9/**
     * @since 2.9
     */
    protected String _objectFieldValueSeparatorWithSpaces;

    /*
    /**********************************************************
    /* Life-cycle (construct, configure)
    /**********************************************************
    */

    public DefaultPrettyPrinter() {
        this(DEFAULT_ROOT_VALUE_SEPARATOR);
    }

    
Constructor that specifies separator String to use between root values;
if null, no separator is printed.
 Note: simply constructs a SerializedString out of parameter, calls DefaultPrettyPrinter(SerializableString) 
Params:
rootSeparator – 
Since:
2.1/**
     * Constructor that specifies separator String to use between root values;
     * if null, no separator is printed.
     *<p>
     * Note: simply constructs a {@link SerializedString} out of parameter,
     * calls {@link #DefaultPrettyPrinter(SerializableString)}
     * 
     * @param rootSeparator
     * 
     * @since 2.1
     */
    public DefaultPrettyPrinter(String rootSeparator) {
        this((rootSeparator == null) ? null : new SerializedString(rootSeparator));
    }

    
Constructor that specifies separator String to use between root values;
if null, no separator is printed.
Params:
rootSeparator – 
Since:
2.1/**
     * Constructor that specifies separator String to use between root values;
     * if null, no separator is printed.
     * 
     * @param rootSeparator
     * 
     * @since 2.1
     */
    public DefaultPrettyPrinter(SerializableString rootSeparator) {
        _rootSeparator = rootSeparator;
        withSeparators(DEFAULT_SEPARATORS);
    }
    
    public DefaultPrettyPrinter(DefaultPrettyPrinter base) {
        this(base, base._rootSeparator);
    }

    public DefaultPrettyPrinter(DefaultPrettyPrinter base,
            SerializableString rootSeparator)
    {
        _arrayIndenter = base._arrayIndenter;
        _objectIndenter = base._objectIndenter;
        _spacesInObjectEntries = base._spacesInObjectEntries;
        _nesting = base._nesting;

        _separators = base._separators;
        _objectFieldValueSeparatorWithSpaces = base._objectFieldValueSeparatorWithSpaces;

        _rootSeparator = rootSeparator;
    }

    public DefaultPrettyPrinter withRootSeparator(SerializableString rootSeparator)
    {
        if (_rootSeparator == rootSeparator ||
                (rootSeparator != null && rootSeparator.equals(_rootSeparator))) {
            return this;
        }
        return new DefaultPrettyPrinter(this, rootSeparator);
    }

    
Since:
2.6/**
     * @since 2.6
     */
    public DefaultPrettyPrinter withRootSeparator(String rootSeparator) {
        return withRootSeparator((rootSeparator == null) ? null : new SerializedString(rootSeparator));
    }

    public void indentArraysWith(Indenter i) {
        _arrayIndenter = (i == null) ? NopIndenter.instance : i;
    }

    public void indentObjectsWith(Indenter i) {
        _objectIndenter = (i == null) ? NopIndenter.instance : i;
    }

    
Since:
2.3/**
     * @since 2.3
     */
    public DefaultPrettyPrinter withArrayIndenter(Indenter i) {
        if (i == null) {
            i = NopIndenter.instance;
        }
        if (_arrayIndenter == i) {
            return this;
        }
        DefaultPrettyPrinter pp = new DefaultPrettyPrinter(this);
        pp._arrayIndenter = i;
        return pp;
    }

    
Since:
2.3/**
     * @since 2.3
     */
    public DefaultPrettyPrinter withObjectIndenter(Indenter i) {
        if (i == null) {
            i = NopIndenter.instance;
        }
        if (_objectIndenter == i) {
            return this;
        }
        DefaultPrettyPrinter pp = new DefaultPrettyPrinter(this);
        pp._objectIndenter = i;
        return pp;
    }

    
"Mutant factory" method that will return a pretty printer instance
that does use spaces inside object entries; if 'this' instance already
does this, it is returned; if not, a new instance will be constructed
and returned.
Since:
2.3/**
     * "Mutant factory" method that will return a pretty printer instance
     * that does use spaces inside object entries; if 'this' instance already
     * does this, it is returned; if not, a new instance will be constructed
     * and returned.
     *
     * @since 2.3
     */
    public DefaultPrettyPrinter withSpacesInObjectEntries() {
        return _withSpaces(true);
    }

    
"Mutant factory" method that will return a pretty printer instance
that does not use spaces inside object entries; if 'this' instance already
does this, it is returned; if not, a new instance will be constructed
and returned.
Since:
2.3/**
     * "Mutant factory" method that will return a pretty printer instance
     * that does not use spaces inside object entries; if 'this' instance already
     * does this, it is returned; if not, a new instance will be constructed
     * and returned.
     *
     * @since 2.3
     */
    public DefaultPrettyPrinter withoutSpacesInObjectEntries() {
        return _withSpaces(false);
    }

    protected DefaultPrettyPrinter _withSpaces(boolean state)
    {
        if (_spacesInObjectEntries == state) {
            return this;
        }
        DefaultPrettyPrinter pp = new DefaultPrettyPrinter(this);
        pp._spacesInObjectEntries = state;
        return pp;
    }

    
Since:
2.9/**
     * @since 2.9
     */
    public DefaultPrettyPrinter withSeparators(Separators separators) {
        _separators = separators;
        _objectFieldValueSeparatorWithSpaces = " " + separators.getObjectFieldValueSeparator() + " ";
        return this;
    }

    /*
    /**********************************************************
    /* Instantiatable impl
    /**********************************************************
     */

    @Override
    public DefaultPrettyPrinter createInstance() {
        if (getClass() != DefaultPrettyPrinter.class) { // since 2.10
            throw new IllegalStateException("Failed `createInstance()`: "+getClass().getName()
                    +" does not override method; it has to");
        }
        return new DefaultPrettyPrinter(this);
    }

    /*
    /**********************************************************
    /* PrettyPrinter impl
    /**********************************************************
     */

    @Override
    public void writeRootValueSeparator(JsonGenerator g) throws IOException
    {
        if (_rootSeparator != null) {
            g.writeRaw(_rootSeparator);
        }
    }

    @Override
    public void writeStartObject(JsonGenerator g) throws IOException
    {
        g.writeRaw('{');
        if (!_objectIndenter.isInline()) {
            ++_nesting;
        }
    }

    @Override
    public void beforeObjectEntries(JsonGenerator g) throws IOException
    {
        _objectIndenter.writeIndentation(g, _nesting);
    }

    
Method called after an object field has been output, but
before the value is output.

Default handling (without pretty-printing) will output a single
colon to separate the two. Pretty-printer is
to output a colon as well, but can surround that with other
(white-space) decoration.
/**
     * Method called after an object field has been output, but
     * before the value is output.
     *<p>
     * Default handling (without pretty-printing) will output a single
     * colon to separate the two. Pretty-printer is
     * to output a colon as well, but can surround that with other
     * (white-space) decoration.
     */
    @Override
    public void writeObjectFieldValueSeparator(JsonGenerator g) throws IOException
    {
        if (_spacesInObjectEntries) {
            g.writeRaw(_objectFieldValueSeparatorWithSpaces);
        } else {
            g.writeRaw(_separators.getObjectFieldValueSeparator());
        }
    }

    
Method called after an object entry (field:value) has been completely
output, and before another value is to be output.

Default handling (without pretty-printing) will output a single
comma to separate the two. Pretty-printer is
to output a comma as well, but can surround that with other
(white-space) decoration.
/**
     * Method called after an object entry (field:value) has been completely
     * output, and before another value is to be output.
     *<p>
     * Default handling (without pretty-printing) will output a single
     * comma to separate the two. Pretty-printer is
     * to output a comma as well, but can surround that with other
     * (white-space) decoration.
     */
    @Override
    public void writeObjectEntrySeparator(JsonGenerator g) throws IOException
    {
        g.writeRaw(_separators.getObjectEntrySeparator());
        _objectIndenter.writeIndentation(g, _nesting);
    }

    @Override
    public void writeEndObject(JsonGenerator g, int nrOfEntries) throws IOException
    {
        if (!_objectIndenter.isInline()) {
            --_nesting;
        }
        if (nrOfEntries > 0) {
            _objectIndenter.writeIndentation(g, _nesting);
        } else {
            g.writeRaw(' ');
        }
        g.writeRaw('}');
    }

    @Override
    public void writeStartArray(JsonGenerator g) throws IOException
    {
        if (!_arrayIndenter.isInline()) {
            ++_nesting;
        }
        g.writeRaw('[');
    }

    @Override
    public void beforeArrayValues(JsonGenerator g) throws IOException {
        _arrayIndenter.writeIndentation(g, _nesting);
    }

    
Method called after an array value has been completely
output, and before another value is to be output.

Default handling (without pretty-printing) will output a single
comma to separate the two. Pretty-printer is
to output a comma as well, but can surround that with other
(white-space) decoration.
/**
     * Method called after an array value has been completely
     * output, and before another value is to be output.
     *<p>
     * Default handling (without pretty-printing) will output a single
     * comma to separate the two. Pretty-printer is
     * to output a comma as well, but can surround that with other
     * (white-space) decoration.
     */
    @Override
    public void writeArrayValueSeparator(JsonGenerator g) throws IOException
    {
        g.writeRaw(_separators.getArrayValueSeparator());
        _arrayIndenter.writeIndentation(g, _nesting);
    }

    @Override
    public void writeEndArray(JsonGenerator g, int nrOfValues) throws IOException
    {
        if (!_arrayIndenter.isInline()) {
            --_nesting;
        }
        if (nrOfValues > 0) {
            _arrayIndenter.writeIndentation(g, _nesting);
        } else {
            g.writeRaw(' ');
        }
        g.writeRaw(']');
    }

    /*
    /**********************************************************
    /* Helper classes
    /**********************************************************
     */

    
Dummy implementation that adds no indentation whatsoever
/**
     * Dummy implementation that adds no indentation whatsoever
     */
    public static class NopIndenter
        implements Indenter, java.io.Serializable
    {
        public static final NopIndenter instance = new NopIndenter();

        @Override
        public void writeIndentation(JsonGenerator g, int level) throws IOException { }

        @Override
        public boolean isInline() { return true; }
    }

    
This is a very simple indenter that only adds a
single space for indentation. It is used as the default
indenter for array values.
/**
     * This is a very simple indenter that only adds a
     * single space for indentation. It is used as the default
     * indenter for array values.
     */
    public static class FixedSpaceIndenter extends NopIndenter
    {
        public static final FixedSpaceIndenter instance = new FixedSpaceIndenter();

        @Override
        public void writeIndentation(JsonGenerator g, int level) throws IOException
        {
            g.writeRaw(' ');
        }

        @Override
        public boolean isInline() { return true; }
    }
}