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/ser/impl/AttributePropertyWriter.java

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

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.cfg.MapperConfig;
import com.fasterxml.jackson.databind.introspect.AnnotatedClass;
import com.fasterxml.jackson.databind.introspect.BeanPropertyDefinition;
import com.fasterxml.jackson.databind.ser.VirtualBeanPropertyWriter;
import com.fasterxml.jackson.databind.util.Annotations;

/**
 * {@link VirtualBeanPropertyWriter} implementation used for
 * {@link com.fasterxml.jackson.databind.annotation.JsonAppend},
 * to serialize properties backed-by dynamically assignable attribute
 * values.
 * 
 * @since 2.5
 */
public class AttributePropertyWriter
    extends VirtualBeanPropertyWriter
{
    private static final long serialVersionUID = 1;

    protected final String _attrName;

    /*
    /**********************************************************
    /* Life-cycle
    /**********************************************************
     */

    protected AttributePropertyWriter(String attrName, BeanPropertyDefinition propDef,
            Annotations contextAnnotations, JavaType declaredType) {
        this(attrName, propDef, contextAnnotations, declaredType, propDef.findInclusion());
    }

    protected AttributePropertyWriter(String attrName, BeanPropertyDefinition propDef,
            Annotations contextAnnotations, JavaType declaredType,
            JsonInclude.Value inclusion)
    {
        super(propDef, contextAnnotations, declaredType,
                /* value serializer */ null, /* type serializer */ null, /* ser type */ null,
                inclusion,
                // 10-Oct-2016, tatu: Could enable per-view settings too in future
                null);
        _attrName = attrName;
    }

    public static AttributePropertyWriter construct(String attrName,
            BeanPropertyDefinition propDef,
            Annotations contextAnnotations,
            JavaType declaredType)
    {
        return new AttributePropertyWriter(attrName, propDef,
                contextAnnotations, declaredType);
    }
    
    protected AttributePropertyWriter(AttributePropertyWriter base) {
        super(base);
        _attrName = base._attrName;
    }

    /**
     * Since this method should typically not be called on this sub-type,
     * default implementation simply throws an {@link IllegalStateException}.
     */
    @Override
    public VirtualBeanPropertyWriter withConfig(MapperConfig<?> config,
            AnnotatedClass declaringClass, BeanPropertyDefinition propDef, JavaType type) {
        throw new IllegalStateException("Should not be called on this type");
    }
    
    /*
    /**********************************************************
    /* Overrides for actual serialization, value access
    /**********************************************************
     */
    
    @Override
    protected Object value(Object bean, JsonGenerator jgen, SerializerProvider prov) throws Exception {
        return prov.getAttribute(_attrName);
    }
}

⏎ com/fasterxml/jackson/databind/ser/impl/AttributePropertyWriter.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