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/JsonLocationInstantiator.java

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

import com.fasterxml.jackson.core.JsonLocation;
import com.fasterxml.jackson.core.io.ContentReference;
import com.fasterxml.jackson.databind.DeserializationConfig;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.PropertyMetadata;
import com.fasterxml.jackson.databind.PropertyName;
import com.fasterxml.jackson.databind.deser.CreatorProperty;
import com.fasterxml.jackson.databind.deser.SettableBeanProperty;
import com.fasterxml.jackson.databind.deser.ValueInstantiator;

/**
 * For {@link JsonLocation}, we should be able to just implement
 * {@link ValueInstantiator} (not that explicit one would be very
 * hard but...)
 */
public class JsonLocationInstantiator
    extends ValueInstantiator.Base
{
    private static final long serialVersionUID = 1L;

    public JsonLocationInstantiator() {
        super(JsonLocation.class);
    }

    @Override
    public boolean canCreateFromObjectWith() { return true; }
    
    @Override
    public SettableBeanProperty[] getFromObjectArguments(DeserializationConfig config) {
        JavaType intType = config.constructType(Integer.TYPE);
        JavaType longType = config.constructType(Long.TYPE);
        return new SettableBeanProperty[] {
                // 14-Mar-2021, tatu: with 2.13 and later, not really used,
                //   but may be produced by older versions so leave as is.
                creatorProp("sourceRef", config.constructType(Object.class), 0),
                creatorProp("byteOffset", longType, 1),
                creatorProp("charOffset", longType, 2),
                creatorProp("lineNr", intType, 3),
                creatorProp("columnNr", intType, 4)
        };
    }

    private static CreatorProperty creatorProp(String name, JavaType type, int index) {
        return CreatorProperty.construct(PropertyName.construct(name), type, null,
                null, null, null, index, null, PropertyMetadata.STD_REQUIRED);
    }

    @Override
    public Object createFromObjectWith(DeserializationContext ctxt, Object[] args) {
        // 14-Mar-2021, tatu: Before 2.13 constructor directly took "raw" source ref;
        //   with 2.13 changed to use `InputSourceReference`... left almost as is,
        //   for compatibility.
        final ContentReference srcRef = ContentReference.rawReference(args[0]);
        return new JsonLocation(srcRef, _long(args[1]), _long(args[2]),
                _int(args[3]), _int(args[4]));
    }

    private final static long _long(Object o) {
        return (o == null) ? 0L : ((Number) o).longValue();
    }

    private final static int _int(Object o) {
        return (o == null) ? 0 : ((Number) o).intValue();
    }
}

⏎ com/fasterxml/jackson/databind/deser/std/JsonLocationInstantiator.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