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/impl/UnwrappedPropertyHandler.java

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

import java.io.IOException;
import java.util.*;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.deser.SettableBeanProperty;
import com.fasterxml.jackson.databind.util.NameTransformer;
import com.fasterxml.jackson.databind.util.TokenBuffer;

/**
 * Object that is responsible for handling acrobatics related to
 * deserializing "unwrapped" values; sets of properties that are
 * embedded (inlined) as properties of parent JSON object.
 */
public class UnwrappedPropertyHandler
{
    protected final List<SettableBeanProperty> _properties;

    public UnwrappedPropertyHandler()  {
        _properties = new ArrayList<SettableBeanProperty>();
   }
    protected UnwrappedPropertyHandler(List<SettableBeanProperty> props)  {
        _properties = props;
    }

    public void addProperty(SettableBeanProperty property) {
        _properties.add(property);
    }

    public UnwrappedPropertyHandler renameAll(NameTransformer transformer)
    {
        ArrayList<SettableBeanProperty> newProps = new ArrayList<SettableBeanProperty>(_properties.size());
        for (SettableBeanProperty prop : _properties) {
            String newName = transformer.transform(prop.getName());
            prop = prop.withSimpleName(newName);
            JsonDeserializer<?> deser = prop.getValueDeserializer();
            if (deser != null) {
                @SuppressWarnings("unchecked")
                JsonDeserializer<Object> newDeser = (JsonDeserializer<Object>)
                    deser.unwrappingDeserializer(transformer);
                if (newDeser != deser) {
                    prop = prop.withValueDeserializer(newDeser);
                }
            }
            newProps.add(prop);
        }
        return new UnwrappedPropertyHandler(newProps);
    }
    
    @SuppressWarnings("resource")
    public Object processUnwrapped(JsonParser originalParser, DeserializationContext ctxt,
            Object bean, TokenBuffer buffered)
        throws IOException
    {
        for (int i = 0, len = _properties.size(); i < len; ++i) {
            SettableBeanProperty prop = _properties.get(i);
            JsonParser p = buffered.asParser();
            p.nextToken();
            prop.deserializeAndSet(p, ctxt, bean);
        }
        return bean;
    }
}

⏎ com/fasterxml/jackson/databind/deser/impl/UnwrappedPropertyHandler.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