Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

Jackson Annotations Source Code files are provided in the source packge (jackson-annotations-2.14.0-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Annotations Source Code below:

⏎ com/fasterxml/jackson/annotation/JsonAutoDetect.java

package com.fasterxml.jackson.annotation;

import java.lang.annotation.*;

import java.lang.reflect.Member;
import java.lang.reflect.Modifier;

/**
 * Class annotation that can be used to define which kinds of Methods
 * are to be detected by auto-detection, and with what minimum access level.
 * Auto-detection means using name conventions
 * and/or signature templates to find methods to use for data binding.
 * For example, so-called "getters" can be auto-detected by looking for
 * public member methods that return a value, do not take argument,
 * and have prefix "get" in their name.
 *<p>
 * Default setting for all accessors is {@link Visibility#DEFAULT}, which 
 * in turn means that the global defaults are used. Defaults
 * are different for different accessor types (getters need to be public;
 * setters can have any access modifier, for example).
 * If you assign different {@link Visibility} type then it will override
 * global defaults: for example, to require that all setters must be public,
 * you would use:
 *<pre>
 *   &#64;JsonAutoDetect(setterVisibility=Visibility.PUBLIC_ONLY)
 *</pre>
 */
@Target({ElementType.ANNOTATION_TYPE, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@JacksonAnnotation
public @interface JsonAutoDetect
{
    /**
     * Enumeration for possible visibility thresholds (minimum visibility)
     * that can be used to limit which methods (and fields) are
     * auto-detected.
     */
    public enum Visibility {
        /**
         * Value that means that all kinds of access modifiers are acceptable,
         * from private to public.
         */
        ANY,
        /**
         * Value that means that any other access modifier other than 'private'
         * is considered auto-detectable.
         */
        NON_PRIVATE,
        /**
         * Value that means access modifiers 'protected' and 'public' are
         * auto-detectable (and 'private' and "package access" == no modifiers
         * are not)
         */
        PROTECTED_AND_PUBLIC,
        /**
         * Value to indicate that only 'public' access modifier is considered
         * auto-detectable.
         */
        PUBLIC_ONLY,
        /**
         * Value that indicates that no access modifiers are auto-detectable:
         * this can be used to explicitly disable auto-detection for specified
         * types.
         */
        NONE,
        
        /**
         * Value that indicates that default visibility level (whatever it is,
         * depends on context) is to be used. This usually means that inherited
         * value (from parent visibility settings) is to be used.
         */
        DEFAULT;

        public boolean isVisible(Member m) {
            switch (this) {
            case ANY:
                return true;
            case NONE:
                return false;
            case NON_PRIVATE:
                return !Modifier.isPrivate(m.getModifiers());
            case PROTECTED_AND_PUBLIC:
                if (Modifier.isProtected(m.getModifiers())) {
                    return true;
                }
                // fall through to public case:
            case PUBLIC_ONLY:
                return Modifier.isPublic(m.getModifiers());
            default:
                return false;
            }
        }
    }
    
    /**
     * Minimum visibility required for auto-detecting regular getter methods.
     */
    Visibility getterVisibility() default Visibility.DEFAULT;

    /**
     * Minimum visibility required for auto-detecting is-getter methods.
     */
    Visibility isGetterVisibility() default Visibility.DEFAULT;
    
    /**
     * Minimum visibility required for auto-detecting setter methods.
     */    
    Visibility setterVisibility() default Visibility.DEFAULT;

    /**
     * Minimum visibility required for auto-detecting Creator methods,
     * except for no-argument constructors (which are always detected
     * no matter what).
     */
    Visibility creatorVisibility() default Visibility.DEFAULT;

    /**
     * Minimum visibility required for auto-detecting member fields.
     */ 
    Visibility fieldVisibility() default Visibility.DEFAULT;

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

    /**
     * Helper class used to contain information from a single {@link JsonIgnoreProperties}
     * annotation, as well as to provide possible overrides from non-annotation sources.
     *
     * @since 2.9
     */
    public static class Value
        implements JacksonAnnotationValue<JsonAutoDetect>,
            java.io.Serializable
    {
        private static final long serialVersionUID = 1L;

        private final static Visibility DEFAULT_FIELD_VISIBILITY = Visibility.PUBLIC_ONLY;

        /**
         * Default instance with baseline visibility checking:
         *<ul>
         * <li>Only public fields visible</li>
         * <li>Only public getters, is-getters visible</li>
         * <li>All setters (regardless of access) visible</li>
         * <li>Only public Creators visible</li>
         *</ul>
         */
        protected final static Value DEFAULT = new Value(DEFAULT_FIELD_VISIBILITY,
                Visibility.PUBLIC_ONLY, Visibility.PUBLIC_ONLY, Visibility.ANY,
                Visibility.PUBLIC_ONLY);

        /**
         * Empty instance that specifies no overrides, that is, all visibility
         * levels set as {@link Visibility#DEFAULT}.
         */
        protected final static Value NO_OVERRIDES = new Value(Visibility.DEFAULT,
                Visibility.DEFAULT, Visibility.DEFAULT, Visibility.DEFAULT,
                Visibility.DEFAULT);

        protected final Visibility _fieldVisibility;
        protected final Visibility _getterVisibility;
        protected final Visibility _isGetterVisibility;
        protected final Visibility _setterVisibility;
        protected final Visibility _creatorVisibility;

        private Value(Visibility fields,
                Visibility getters, Visibility isGetters, Visibility setters,
                Visibility creators) {
            _fieldVisibility = fields;
            _getterVisibility = getters;
            _isGetterVisibility = isGetters;
            _setterVisibility = setters;
            _creatorVisibility = creators;
        }

        public static Value defaultVisibility() {
            return DEFAULT;
        }

        public static Value noOverrides() {
            return NO_OVERRIDES;
        }

        public static Value from(JsonAutoDetect src) {
            return construct(src.fieldVisibility(),
                    src.getterVisibility(), src.isGetterVisibility(), src.setterVisibility(),
                    src.creatorVisibility());
                    
        }

        /**
         * Factory method for constructing instance with visibility of specified accessor
         * (or, in case of <code>ALL</code>, all of them) set as specified; and the
         * rest (if any) set as {@link Visibility#DEFAULT}).
         */
        public static Value construct(PropertyAccessor acc, Visibility visibility) {
            Visibility fields = Visibility.DEFAULT;
            Visibility getters = Visibility.DEFAULT;
            Visibility isGetters = Visibility.DEFAULT;
            Visibility setters = Visibility.DEFAULT;
            Visibility creators = Visibility.DEFAULT;
            switch (acc) {
            case CREATOR:
                creators = visibility;
                break;
            case FIELD:
                fields = visibility;
                break;
            case GETTER:
                getters = visibility;
                break;
            case IS_GETTER:
                isGetters = visibility;
                break;
            case NONE:
                break;
            case SETTER:
                setters = visibility;
                break;
            case ALL: // default
                fields = getters = isGetters = setters = creators = visibility;
                break;
            }
            return construct(fields, getters, isGetters, setters, creators);
        }

        public static Value construct(Visibility fields,
                Visibility getters, Visibility isGetters, Visibility setters,
                Visibility creators)
        {
            Value v = _predefined(fields, getters, isGetters, setters, creators);
            if (v == null) {
                v = new Value(fields, getters, isGetters, setters, creators);
            }
            return v;
        }

        public Value withFieldVisibility(Visibility v) {
            return construct(v, _getterVisibility, _isGetterVisibility,
                    _setterVisibility, _creatorVisibility);
        }

        public Value withGetterVisibility(Visibility v) {
            return construct(_fieldVisibility, v, _isGetterVisibility,
                    _setterVisibility, _creatorVisibility);
        }

        public Value withIsGetterVisibility(Visibility v) {
            return construct(_fieldVisibility, _getterVisibility, v,
                    _setterVisibility, _creatorVisibility);
        }

        public Value withSetterVisibility(Visibility v) {
            return construct(_fieldVisibility, _getterVisibility, _isGetterVisibility,
                    v, _creatorVisibility);
        }

        public Value withCreatorVisibility(Visibility v) {
            return construct(_fieldVisibility, _getterVisibility, _isGetterVisibility,
                    _setterVisibility, v);
        }

        public static Value merge(Value base, Value overrides)
        {
            return (base == null) ? overrides
                    : base.withOverrides(overrides);
        }

        public Value withOverrides(Value overrides) {
            if ((overrides == null) || (overrides == NO_OVERRIDES) || (overrides == this)) {
                return this;
            }
            if (_equals(this, overrides)) {
                return this;
            }
            Visibility fields = overrides._fieldVisibility;
            if (fields == Visibility.DEFAULT) {
                fields = _fieldVisibility;
            }
            Visibility getters = overrides._getterVisibility;
            if (getters == Visibility.DEFAULT) {
                getters = _getterVisibility;
            }
            Visibility isGetters = overrides._isGetterVisibility;
            if (isGetters == Visibility.DEFAULT) {
                isGetters = _isGetterVisibility;
            }
            Visibility setters = overrides._setterVisibility;
            if (setters == Visibility.DEFAULT) {
                setters = _setterVisibility;
            }
            Visibility creators = overrides._creatorVisibility;
            if (creators == Visibility.DEFAULT) {
                creators = _creatorVisibility;
            }
            return construct(fields, getters, isGetters, setters, creators);
        }

        @Override
        public Class<JsonAutoDetect> valueFor() {
            return JsonAutoDetect.class;
        }

        public Visibility getFieldVisibility() { return _fieldVisibility; }
        public Visibility getGetterVisibility() { return _getterVisibility; }
        public Visibility getIsGetterVisibility() { return _isGetterVisibility; }
        public Visibility getSetterVisibility() { return _setterVisibility; }
        public Visibility getCreatorVisibility() { return _creatorVisibility; }

        // for JDK serialization
        protected Object readResolve() {
            Value v = _predefined(_fieldVisibility, _getterVisibility, _isGetterVisibility,
                    _setterVisibility, _creatorVisibility);
            return (v == null) ? this : v;
        }

        @Override
        public String toString() {
            return String.format(
"JsonAutoDetect.Value(fields=%s,getters=%s,isGetters=%s,setters=%s,creators=%s)",
_fieldVisibility, _getterVisibility, _isGetterVisibility, _setterVisibility, _creatorVisibility
                    );
        }

        @Override
        public int hashCode() {
            return 1 + _fieldVisibility.ordinal()
                ^ (3 * _getterVisibility.ordinal())
                - (7 * _isGetterVisibility.ordinal())
                + (11 * _setterVisibility.ordinal())
                ^ (13 * _creatorVisibility.ordinal())
                    ;
        }

        @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 Value _predefined(Visibility fields,
                Visibility getters, Visibility isGetters, Visibility setters,
                Visibility creators)
        {
            if (fields == DEFAULT_FIELD_VISIBILITY) {
                if ((getters == DEFAULT._getterVisibility)
                    && (isGetters == DEFAULT._isGetterVisibility)
                    && (setters == DEFAULT._setterVisibility)
                    && (creators == DEFAULT._creatorVisibility)) {
                    return DEFAULT;
                }
            } else if (fields == Visibility.DEFAULT) {
                if ((getters == Visibility.DEFAULT)
                        && (isGetters == Visibility.DEFAULT)
                        && (setters == Visibility.DEFAULT)
                        && (creators == Visibility.DEFAULT)) {
                    return NO_OVERRIDES;
                }
            }
            return null;
        }

        private static boolean _equals(Value a, Value b)
        {
            return (a._fieldVisibility == b._fieldVisibility)
                    && (a._getterVisibility == b._getterVisibility)
                    && (a._isGetterVisibility == b._isGetterVisibility)
                    && (a._setterVisibility == b._setterVisibility)
                    && (a._creatorVisibility == b._creatorVisibility)
                    ;
        }
    }
}

⏎ com/fasterxml/jackson/annotation/JsonAutoDetect.java

Or download all of them as a single archive file:

File name: jackson-annotations-2.14.0-sources.jar
File size: 80402 bytes
Release date: 2022-11-05
Download 

⇒ Jackson Dataformat Extensions

⇐ Jackson Data Binding Source Code

⇑ Downloading and Reviewing jackson-*.jar

⇑⇑ Jackson - Java JSON library