package com.fasterxml.jackson.annotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.util.*;

Annotation that can be used to either suppress serialization of
properties (during serialization), or ignore processing of
JSON properties read (during deserialization).

Example:
// to prevent specified fields from being serialized or deserialized
// (i.e. not include in JSON output; or being set even if they were included)
@JsonIgnoreProperties({ "internalId", "secretKey" })
// To ignore any unknown properties in JSON input without exception:
@JsonIgnoreProperties(ignoreUnknown=true)


Annotation can be applied both to classes and
to properties. If used for both, actual set will be union of all
ignorals: that is, you can only add properties to ignore, not remove
or override. So you can not remove properties to ignore using
per-property annotation.
/**
 * Annotation that can be used to either suppress serialization of
 * properties (during serialization), or ignore processing of
 * JSON properties read (during deserialization).
 *<p>
 * Example:
 *<pre>
 * // to prevent specified fields from being serialized or deserialized
 * // (i.e. not include in JSON output; or being set even if they were included)
 * &#064;JsonIgnoreProperties({ "internalId", "secretKey" })
 * // To ignore any unknown properties in JSON input without exception:
 * &#064;JsonIgnoreProperties(ignoreUnknown=true)
 *</pre>
 *<p>
 * Annotation can be applied both to classes and
 * to properties. If used for both, actual set will be union of all
 * ignorals: that is, you can only add properties to ignore, not remove
 * or override. So you can not remove properties to ignore using
 * per-property annotation.
 */
@Target({ElementType.ANNOTATION_TYPE, ElementType.TYPE,
    ElementType.METHOD, ElementType.CONSTRUCTOR, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
@JacksonAnnotation
public @interface JsonIgnoreProperties
{
    
Names of properties to ignore.
/**
     * Names of properties to ignore.
     */
    public String[] value() default { };

    
Property that defines whether it is ok to just ignore any
unrecognized properties during deserialization.
If true, all properties that are unrecognized -- that is,
there are no setters or creators that accept them -- are
ignored without warnings (although handlers for unknown
properties, if any, will still be called) without
exception.

Does not have any effect on serialization.
/**
     * Property that defines whether it is ok to just ignore any
     * unrecognized properties during deserialization.
     * If true, all properties that are unrecognized -- that is,
     * there are no setters or creators that accept them -- are
     * ignored without warnings (although handlers for unknown
     * properties, if any, will still be called) without
     * exception.
     *<p>
     * Does not have any effect on serialization.
     */
    public boolean ignoreUnknown() default false;

    
Property that can be enabled to allow "getters" to be used (that is, prevent ignoral of getters for properties listed in value()). This is commonly set to support defining "read-only" properties; ones for which there is a getter, but no matching setter: in this case, properties should be ignored for deserialization but NOT serialization. Another way to think about this setting is that setting it to `true` will "disable" ignoring of getters. 

Default value is `false`, which means that getters with matching names
will be ignored.
Since:
2.6/**
     * Property that can be enabled to allow "getters" to be used (that is,
     * prevent ignoral of getters for properties listed in {@link #value()}).
     * This is commonly set to support defining "read-only" properties; ones
     * for which there is a getter, but no matching setter: in this case,
     * properties should be ignored for deserialization but NOT serialization.
     * Another way to think about this setting is that setting it to `true`
     * will "disable" ignoring of getters.
     *<p>
     * Default value is `false`, which means that getters with matching names
     * will be ignored.
     * 
     * @since 2.6
     */
    public boolean allowGetters() default false;

    
Property that can be enabled to allow "setters" to be used (that is, prevent ignoral of setters for properties listed in value()). This could be used to specify "write-only" properties; ones that should not be serialized out, but that may be provided in for deserialization. Another way to think about this setting is that setting it to `true` will "disable" ignoring of setters. 

Default value is `false`, which means that setters with matching names
will be ignored.
Since:
2.6/**
     * Property that can be enabled to allow "setters" to be used (that is,
     * prevent ignoral of setters for properties listed in {@link #value()}).
     * This could be used to specify "write-only" properties; ones
     * that should not be serialized out, but that may be provided in for
     * deserialization.
     * Another way to think about this setting is that setting it to `true`
     * will "disable" ignoring of setters.
     *<p>
     * Default value is `false`, which means that setters with matching names
     * will be ignored.
     * 
     * @since 2.6
     */
    public boolean allowSetters() default false;

    /*
    /**********************************************************
    /* Value class used to enclose information, allow for
    /* merging of layered configuration settings.
    /**********************************************************
     */

    
Helper class used to contain information from a single JsonIgnoreProperties annotation, as well as to provide possible overrides from non-annotation sources. 
Since:
2.8/**
     * Helper class used to contain information from a single {@link JsonIgnoreProperties}
     * annotation, as well as to provide possible overrides from non-annotation sources.
     *
     * @since 2.8
     */
    public static class Value
        implements JacksonAnnotationValue<JsonIgnoreProperties>,
            java.io.Serializable
    {
        private static final long serialVersionUID = 1L;

        
Default instance has no explicitly ignored fields, does not ignore unknowns,
does not explicitly allow getters/setters (that is, ignorals apply to both),
but does use merging for combining overrides with base settings
/**
         * Default instance has no explicitly ignored fields, does not ignore unknowns,
         * does not explicitly allow getters/setters (that is, ignorals apply to both),
         * but does use merging for combining overrides with base settings
         */
        protected final static Value EMPTY = new Value(Collections.<String>emptySet(),
                false, false, false, true);

        
Names of properties to ignore.
/**
         * Names of properties to ignore.
         */
        protected final Set<String> _ignored;

        protected final boolean _ignoreUnknown;
        protected final boolean _allowGetters;
        protected final boolean _allowSetters;

        protected final boolean _merge;

        protected Value(Set<String> ignored, boolean ignoreUnknown,
                boolean allowGetters, boolean allowSetters,
                boolean merge)
        {
            if (ignored == null) {
                _ignored = Collections.emptySet();
            } else {
                _ignored = ignored;
            }
            _ignoreUnknown = ignoreUnknown;
            _allowGetters = allowGetters;
            _allowSetters = allowSetters;
            _merge = merge;
        }

        public static Value from(JsonIgnoreProperties src) {
            if (src == null) {
                return EMPTY; // since 2.9
            }
            return construct(_asSet(src.value()),
                    src.ignoreUnknown(), src.allowGetters(), src.allowSetters(),
                // 27-Apr-2016, tatu: No matching property in annotation because
                //   we don't know how to merge (so no point in pretending it's there)
                //   so choice is arbitrary. Probably will default to `false` fwtw:
                    false);
        }

        
Factory method that may be used (although is NOT the recommended way) to construct an instance from a full set of properties. Most users would be better of starting by empty() instance and using `withXxx()`/`withoutXxx()` methods, as this factory method may need to be changed if new properties are added in JsonIgnoreProperties annotation. /**
         * Factory method that may be used (although is NOT the recommended way)
         * to construct an instance from a full set of properties. Most users would
         * be better of starting by {@link #empty()} instance and using `withXxx()`/`withoutXxx()`
         * methods, as this factory method may need to be changed if new properties
         * are added in {@link JsonIgnoreProperties} annotation.
         */
        public static Value construct(Set<String> ignored, boolean ignoreUnknown,
                boolean allowGetters, boolean allowSetters,
                boolean merge) {
            if (_empty(ignored, ignoreUnknown, allowGetters, allowSetters, merge)) {
                return EMPTY;
            }
            return new Value(ignored, ignoreUnknown, allowGetters, allowSetters, merge);
        }

        
Accessor for default instances which has "empty" settings; that is:

No explicitly defined fields to ignore
 
Does not ignore unknown fields
 
Does not "allow" getters if property ignored (that is, ignorals apply to both setter and getter)
 
Does not "allow" setters if property ignored (that is, ignorals apply to both setter and getter)
 
Does use merge when combining overrides to base settings, such that `true` settings
  for any of the properties results in `true`, and names of fields are combined (union)
 

/**
         * Accessor for default instances which has "empty" settings; that is:
         *<ul>
         * <li>No explicitly defined fields to ignore
         *  </li>
         * <li>Does not ignore unknown fields
         *  </li>
         * <li>Does not "allow" getters if property ignored (that is, ignorals apply to both setter and getter)
         *  </li>
         * <li>Does not "allow" setters if property ignored (that is, ignorals apply to both setter and getter)
         *  </li>
         * <li>Does use merge when combining overrides to base settings, such that `true` settings
         *   for any of the properties results in `true`, and names of fields are combined (union)
         *  </li>
         * </ul>
         */
        public static Value empty() {
            return EMPTY;
        }

        
Helper method that will try to combine values from two Value instances, using one as base settings, and the other as overrides to use instead of base values when defined; base values are only use if override does not specify a value (matching value is null or logically missing). Note that one or both of value instances may be `null`, directly; if both are `null`, result will also be `null`; otherwise never null. /**
         * Helper method that will try to combine values from two {@link Value}
         * instances, using one as base settings, and the other as overrides
         * to use instead of base values when defined; base values are only
         * use if override does not specify a value (matching value is null
         * or logically missing).
         * Note that one or both of value instances may be `null`, directly;
         * if both are `null`, result will also be `null`; otherwise never null.
         */
        public static Value merge(Value base, Value overrides)
        {
            return (base == null) ? overrides
                    : base.withOverrides(overrides);
        }

        
Since:
2.8/**
         * @since 2.8
         */
        public static Value mergeAll(Value... values)
        {
            Value result = null;
            for (Value curr : values) {
                if (curr != null) {
                    result = (result == null)  ? curr : result.withOverrides(curr);
                }
            }
            return result;
        }

        public static Value forIgnoredProperties(Set<String> propNames) {
            return EMPTY.withIgnored(propNames);
        }

        public static Value forIgnoredProperties(String... propNames) {
            if (propNames.length == 0) {
                return EMPTY;
            }
            return EMPTY.withIgnored(_asSet(propNames));
        }

        public static Value forIgnoreUnknown(boolean state) {
            return state ? EMPTY.withIgnoreUnknown()
                    : EMPTY.withoutIgnoreUnknown();
        }
        
        
Mutant factory method that merges values of this value with given override
values, so that any explicitly defined inclusion in overrides has precedence over
settings of this value instance. If no overrides exist will return this instance; otherwise new Value with changed inclusion values. /**
         * Mutant factory method that merges values of this value with given override
         * values, so that any explicitly defined inclusion in overrides has precedence over
         * settings of this value instance. If no overrides exist will return <code>this</code>
         * instance; otherwise new {@link Value} with changed inclusion values.
         */
        public Value withOverrides(Value overrides) {
            if ((overrides == null) || (overrides == EMPTY)) {
                return this;
            }
            // if non merging, we'll actually end up with just the overrides don't we?
            // (given there's no "use default" value for anything
            if (!overrides._merge) {
                return overrides;
            }
            if (_equals(this, overrides)) {
                return this;
            }

            // Here's where mergeability needs to be checked
            Set<String> ignored = _merge(_ignored, overrides._ignored);
            boolean ignoreUnknown = _ignoreUnknown || overrides._ignoreUnknown;
            boolean allowGetters = _allowGetters || overrides._allowGetters;
            boolean allowSetters = _allowSetters || overrides._allowSetters;

            // must have 'merge=true' to get this far
            return construct(ignored, ignoreUnknown, allowGetters, allowSetters, true);
        }

        public Value withIgnored(Set<String> ignored) {
            return construct(ignored, _ignoreUnknown, _allowGetters, _allowSetters, _merge);
        }

        public Value withIgnored(String... ignored) {
            return construct(_asSet(ignored), _ignoreUnknown, _allowGetters, _allowSetters, _merge);
        }
        
        public Value withoutIgnored() {
            return construct(null, _ignoreUnknown, _allowGetters, _allowSetters, _merge);
        }
        
        public Value withIgnoreUnknown() {
            return _ignoreUnknown ? this :
                construct(_ignored, true, _allowGetters, _allowSetters, _merge);
        }
        public Value withoutIgnoreUnknown() {
            return !_ignoreUnknown ? this :
                construct(_ignored, false, _allowGetters, _allowSetters, _merge);
        }

        public Value withAllowGetters() {
            return _allowGetters ? this :
                construct(_ignored, _ignoreUnknown, true, _allowSetters, _merge);
        }
        public Value withoutAllowGetters() {
            return !_allowGetters ? this :
                construct(_ignored, _ignoreUnknown, false, _allowSetters, _merge);
        }

        public Value withAllowSetters() {
            return _allowSetters ? this :
                construct(_ignored, _ignoreUnknown, _allowGetters, true, _merge);
        }
        public Value withoutAllowSetters() {
            return !_allowSetters ? this :
                construct(_ignored, _ignoreUnknown, _allowGetters, false, _merge);
        }
        
        public Value withMerge() {
            return _merge ? this :
                construct(_ignored, _ignoreUnknown, _allowGetters, _allowSetters, true);
        }

        public Value withoutMerge() {
            return !_merge ? this :
                construct(_ignored, _ignoreUnknown, _allowGetters, _allowSetters, false);
        }
        
        @Override
        public Class<JsonIgnoreProperties> valueFor() {
            return JsonIgnoreProperties.class;
        }

        // for JDK serialization
        protected Object readResolve() {
            if (_empty(_ignored, _ignoreUnknown, _allowGetters, _allowSetters, _merge)) {
                return EMPTY;
            }
            return this;
        }

        public Set<String> getIgnored() {
            return _ignored;
        }

        
Method called to find names of properties to ignore when used for serialization: functionally same as getIgnored if getAllowGetters() is false (that is, there is "allowGetters=false" or equivalent), otherwise returns empty Set. /**
         * Method called to find names of properties to ignore when used for
         * serialization: functionally
         * same as {@link #getIgnored} if {@link #getAllowGetters()} is false
         * (that is, there is "allowGetters=false" or equivalent),
         * otherwise returns empty {@link java.util.Set}.
         */
        public Set<String> findIgnoredForSerialization() {
            if (_allowGetters) {
                return Collections.emptySet();
            }
            return _ignored;
        }

        
Method called to find names of properties to ignore when used for serialization: functionally same as getIgnored if getAllowSetters() is false (that is, there is "allowSetters=false" or equivalent), otherwise returns empty Set. /**
         * Method called to find names of properties to ignore when used for
         * serialization: functionally
         * same as {@link #getIgnored} if {@link #getAllowSetters()} is false
         * (that is, there is "allowSetters=false" or equivalent),
         * otherwise returns empty {@link java.util.Set}.
         */
        public Set<String> findIgnoredForDeserialization() {
            if (_allowSetters) {
                return Collections.emptySet();
            }
            return _ignored;
        }
        
        public boolean getIgnoreUnknown() {
            return _ignoreUnknown;
        }

        public boolean getAllowGetters() {
            return _allowGetters;
        }

        public boolean getAllowSetters() {
            return _allowSetters;
        }

        public boolean getMerge() {
            return _merge;
        }

        @Override
        public String toString() {
            return String.format("JsonIgnoreProperties.Value(ignored=%s,ignoreUnknown=%s,allowGetters=%s,allowSetters=%s,merge=%s)",
                    _ignored, _ignoreUnknown, _allowGetters, _allowSetters, _merge);
        }

        @Override
        public int hashCode() {
            return (_ignored.size())
                    + (_ignoreUnknown ? 1 : -3)
                    + (_allowGetters ? 3 : -7)
                    + (_allowSetters ? 7 : -11)
                    + (_merge ? 11 : -13)
                            ;
        }

        @Override
        public boolean equals(Object o) {
            if (o == this) return true;
            if (o == null) return false;
            return (o.getClass() == getClass())
                    && _equals(this, (Value) o);
        }

        private static boolean _equals(Value a, Value b)
        {
            return (a._ignoreUnknown == b._ignoreUnknown)
                    && (a._merge == b._merge)
                    && (a._allowGetters == b._allowGetters)
                    && (a._allowSetters == b._allowSetters)
                    // this last just because it can be expensive
                    && a._ignored.equals(b._ignored)
                    ;
        }

        private static Set<String> _asSet(String[] v) {
            if (v == null || v.length == 0) {
                return Collections.emptySet();
            }
            Set<String> s = new HashSet<String>(v.length);
            for (String str : v) {
                s.add(str);
            }
            return s;
        }

        private static Set<String> _merge(Set<String> s1, Set<String> s2)
        {
            if (s1.isEmpty()) {
                return s2;
            } else if (s2.isEmpty()) {
                return s1;
            }
            HashSet<String> result = new HashSet<String>(s1.size() + s2.size());
            result.addAll(s1);
            result.addAll(s2);
            return result;
        }

        private static boolean _empty(Set<String> ignored, boolean ignoreUnknown,
                boolean allowGetters, boolean allowSetters, boolean merge)
        {
            if ((ignoreUnknown == EMPTY._ignoreUnknown)
                    && (allowGetters == EMPTY._allowGetters)
                    && (allowSetters == EMPTY._allowSetters)
                    && (merge == EMPTY._merge)) {
                return (ignored == null || ignored.size() == 0);
            }
            return false;
        }
    }
}