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/deser/std/StdNodeBasedDeserializer.java

package com.fasterxml.jackson.databind.deser.std;

import java.io.IOException;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.ResolvableDeserializer;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;

/**
 * Convenience deserializer that may be used to deserialize values given an
 * intermediate tree representation ({@link JsonNode}).
 * Note that this is a slightly simplified alternative to {@link StdDelegatingDeserializer}).
 *
 * @param <T> Target type of this deserializer; that is, type of values that
 *   input data is deserialized into.
 * 
 * @since 2.5
 */
public abstract class StdNodeBasedDeserializer<T>
    extends StdDeserializer<T>
    implements ResolvableDeserializer
{
    private static final long serialVersionUID = 1L;

    protected JsonDeserializer<Object> _treeDeserializer;

    /*
    /**********************************************************
    /* Life-cycle
    /**********************************************************
     */
    
    protected StdNodeBasedDeserializer(JavaType targetType) {
        super(targetType);
    }

    protected StdNodeBasedDeserializer(Class<T> targetType) {
        super(targetType);
    }

    /**
     * "Copy-constructor" used when creating a modified copies, most often
     * if sub-class implements {@link com.fasterxml.jackson.databind.deser.ContextualDeserializer}.
     */
    protected StdNodeBasedDeserializer(StdNodeBasedDeserializer<?> src) {
        super(src);
        _treeDeserializer = src._treeDeserializer;
    }

    @Override
    public void resolve(DeserializationContext ctxt) throws JsonMappingException {
        _treeDeserializer = ctxt.findRootValueDeserializer(ctxt.constructType(JsonNode.class));
    }

    /*
    /**********************************************************
    /* Abstract methods for sub-classes
    /**********************************************************
     */

    public abstract T convert(JsonNode root, DeserializationContext ctxt) throws IOException;

    /*
    /**********************************************************
    /* JsonDeserializer impl
    /**********************************************************
     */
    
    @Override
    public T deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
        JsonNode n = (JsonNode) _treeDeserializer.deserialize(jp, ctxt);
        return convert(n, ctxt);
    }

    @Override
    public Object deserializeWithType(JsonParser jp, DeserializationContext ctxt,
            TypeDeserializer td)
        throws IOException
    {
        // 19-Nov-2014, tatu: Quite likely we'd have some issues but... let's
        //   try, just in case.
        JsonNode n = (JsonNode) _treeDeserializer.deserializeWithType(jp, ctxt, td);
        return convert(n, ctxt);
    }
}

⏎ com/fasterxml/jackson/databind/deser/std/StdNodeBasedDeserializer.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
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⇑⇑ Jackson - Java JSON library