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

Jackson Databind Source Code files are provided in the source packge (jackson-databind-2.12.4-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Databind Source Code below:

⏎ com/fasterxml/jackson/databind/annotation/JsonTypeIdResolver.java

package com.fasterxml.jackson.databind.annotation;

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


import com.fasterxml.jackson.annotation.JacksonAnnotation;
import com.fasterxml.jackson.databind.jsontype.TypeIdResolver;

/**
 * Annotation that can be used to plug a custom type identifier handler
 * ({@link TypeIdResolver})
 * to be used by
 * {@link com.fasterxml.jackson.databind.jsontype.TypeSerializer}s
 * and {@link com.fasterxml.jackson.databind.jsontype.TypeDeserializer}s
 * for converting between java types and type id included in JSON content.
 * In simplest cases this can be a simple class with static mapping between
 * type names and matching classes.
 *<p>
 * NOTE: since 2.4, applicable to properties as well (should have been long time
 *  ago, but problem only found then)
 */
@Target({ElementType.ANNOTATION_TYPE, ElementType.METHOD, ElementType.FIELD, ElementType.TYPE, ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
@JacksonAnnotation
public @interface JsonTypeIdResolver
{
    /**
     * Defines implementation class of {@link TypeIdResolver} to use for
     * converting between external type id (type name) and actual
     * type of object.
     */
    public Class<? extends TypeIdResolver> value();
}

⏎ com/fasterxml/jackson/databind/annotation/JsonTypeIdResolver.java

 

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⇑⇑ Jackson - Java JSON library