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/MappingJsonFactory.java

package com.fasterxml.jackson.databind;

import java.io.IOException;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.format.InputAccessor;
import com.fasterxml.jackson.core.format.MatchStrength;

/**
 * Sub-class of {@link JsonFactory} that will create a proper
 * {@link ObjectCodec} to allow seam-less conversions between
 * JSON content and Java objects (POJOs).
 * The only addition to regular {@link JsonFactory} currently
 * is that {@link ObjectMapper} is constructed and passed as
 * the codec to use.
 */
public class MappingJsonFactory
    extends JsonFactory
{
    private static final long serialVersionUID = -1; // since 2.7

    public MappingJsonFactory()
    {
        this(null);
    }

    public MappingJsonFactory(ObjectMapper mapper)
    {
        super(mapper);
        if (mapper == null) {
            setCodec(new ObjectMapper(this));
        }
    }

    public MappingJsonFactory(JsonFactory src, ObjectMapper mapper)
    {
        super(src, mapper);
        if (mapper == null) {
            setCodec(new ObjectMapper(this));
        }
    }

    /**
     * We'll override the method to return more specific type; co-variance
     * helps here
     */
    @Override
    public final ObjectMapper getCodec() { return (ObjectMapper) _objectCodec; }

    // @since 2.1
    @Override
    public JsonFactory copy()
    {
        _checkInvalidCopy(MappingJsonFactory.class);
        // note: as with base class, must NOT copy mapper reference
        return new MappingJsonFactory(this, null);
    }
    
    /*
    /**********************************************************
    /* Format detection functionality (since 1.8)
    /**********************************************************
     */
    
    /**
     * Sub-classes need to override this method
     */
    @Override
    public String getFormatName()
    {
        /* since non-JSON factories typically should not extend this class,
         * let's just always return JSON as name.
         */
        return FORMAT_NAME_JSON;
    }

    /**
     * Sub-classes need to override this method
     */
    @Override
    public MatchStrength hasFormat(InputAccessor acc) throws IOException
    {
        if (getClass() == MappingJsonFactory.class) {
            return hasJSONFormat(acc);
        }
        return null;
    }
}

⏎ com/fasterxml/jackson/databind/MappingJsonFactory.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 

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⇑⇑ Jackson - Java JSON library