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-2.14.0-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Databind Source Code below:

⏎ com/fasterxml/jackson/databind/jsontype/impl/AsPropertyTypeSerializer.java

package com.fasterxml.jackson.databind.jsontype.impl;

import com.fasterxml.jackson.annotation.JsonTypeInfo.As;

import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.jsontype.TypeIdResolver;

/**
 * Type serializer that preferably embeds type information as an additional
 * JSON Object property, if possible (when resulting serialization would
 * use JSON Object). If this is not possible (for JSON Arrays, scalars),
 * uses a JSON Array wrapper (similar to how
 * {@link As#WRAPPER_ARRAY} always works) as a fallback.
 */
public class AsPropertyTypeSerializer
    extends AsArrayTypeSerializer
{
    protected final String _typePropertyName;

    public AsPropertyTypeSerializer(TypeIdResolver idRes, BeanProperty property, String propName)
    {
        super(idRes, property);
        _typePropertyName = propName;
    }

    @Override
    public AsPropertyTypeSerializer forProperty(BeanProperty prop) {
        return (_property == prop) ? this :
            new AsPropertyTypeSerializer(this._idResolver, prop, this._typePropertyName);
    }
    
    @Override
    public String getPropertyName() { return _typePropertyName; }

    @Override
    public As getTypeInclusion() { return As.PROPERTY; }
}

⏎ com/fasterxml/jackson/databind/jsontype/impl/AsPropertyTypeSerializer.java

Or download all of them as a single archive file:

File name: jackson-databind-2.14.0-sources.jar
File size: 1187952 bytes
Release date: 2022-11-05
Download 

⇒ Jackson Annotations Source Code

⇐ Download and Install Jackson Binary Package

⇑ Downloading and Reviewing jackson-*.jar

⇑⇑ Jackson - Java JSON library