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-2.12.4-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Annotations Source Code below:

⏎ com/fasterxml/jackson/databind/introspect/ConcreteBeanPropertyBase.java

package com.fasterxml.jackson.databind.introspect;

import java.util.Collections;
import java.util.List;

import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.AnnotationIntrospector;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.PropertyMetadata;
import com.fasterxml.jackson.databind.PropertyName;
import com.fasterxml.jackson.databind.cfg.MapperConfig;

/**
 * Intermediate {@link BeanProperty} class shared by concrete readable- and
 * writable property implementations for sharing common functionality.
 *
 * @since 2.7
 */
public abstract class ConcreteBeanPropertyBase
    implements BeanProperty, java.io.Serializable
{
    private static final long serialVersionUID = 1;

    /**
     * Additional information about property
     *
     * @since 2.3
     */
    protected final PropertyMetadata _metadata;

    /**
     * @since 2.9
     */
    protected transient List<PropertyName> _aliases;

    protected ConcreteBeanPropertyBase(PropertyMetadata md) {
        _metadata = (md == null) ? PropertyMetadata.STD_REQUIRED_OR_OPTIONAL : md;
    }

    protected ConcreteBeanPropertyBase(ConcreteBeanPropertyBase src) {
        _metadata = src._metadata;
    }

    @Override
    public boolean isRequired() { return _metadata.isRequired(); }

    @Override
    public PropertyMetadata getMetadata() { return _metadata; }
    
    @Override
    public boolean isVirtual() { return false; }

    @Override
    @Deprecated
    public final JsonFormat.Value findFormatOverrides(AnnotationIntrospector intr) {
        JsonFormat.Value f = null;
        if (intr != null) {
            AnnotatedMember member = getMember();
            if (member != null) {
                f = intr.findFormat(member);
            }
        }
        if (f == null) {
            f = EMPTY_FORMAT;
        }
        return f;
    }

    @Override
    public JsonFormat.Value findPropertyFormat(MapperConfig<?> config, Class<?> baseType)
    {
        JsonFormat.Value v1 = config.getDefaultPropertyFormat(baseType);
        JsonFormat.Value v2 = null;
        AnnotationIntrospector intr = config.getAnnotationIntrospector();
        if (intr != null) {
            AnnotatedMember member = getMember();
            if (member != null) {
                v2 = intr.findFormat(member);
            }
        }
        if (v1 == null) {
            return (v2 == null) ? EMPTY_FORMAT : v2;
        }
        return (v2 == null) ? v1 : v1.withOverrides(v2);
    }

    @Override
    public JsonInclude.Value findPropertyInclusion(MapperConfig<?> config, Class<?> baseType)
    {
        AnnotationIntrospector intr = config.getAnnotationIntrospector();
        AnnotatedMember member = getMember();
        if (member == null) {
            JsonInclude.Value def = config.getDefaultPropertyInclusion(baseType);
            return def;
        }
        JsonInclude.Value v0 = config.getDefaultInclusion(baseType, member.getRawType());
        if (intr == null) {
            return v0;
        }
        JsonInclude.Value v = intr.findPropertyInclusion(member);
        if (v0 == null) {
            return v;
        }
        return v0.withOverrides(v);
    }

    @Override
    public List<PropertyName> findAliases(MapperConfig<?> config)
    {
        List<PropertyName> aliases = _aliases;
        if (aliases == null) {
            AnnotationIntrospector intr = config.getAnnotationIntrospector();
            if (intr != null) {
                final AnnotatedMember member = getMember();
                if (member != null) {
                    aliases = intr.findPropertyAliases(member);
                }
            }
            if (aliases == null) {
                aliases = Collections.emptyList();
            }
            _aliases = aliases;
        }
        return aliases;
    }
}

⏎ com/fasterxml/jackson/databind/introspect/ConcreteBeanPropertyBase.java

 

⇒ Jackson Dataformat Extensions

⇐ Jackson Data Binding Source Code

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⇑⇑ Jackson - Java JSON library