Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

Jackson also allows you to parse or generate XML messages with the Jackson Dataformat XML Extension.

Jackson Dataformat XML Source Code files are provided in the source packge (jackson-dataformat-xml-2.14.0-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Dataformat XML Source Code below:

⏎ com/fasterxml/jackson/dataformat/xml/DefaultingXmlTypeResolverBuilder.java

package com.fasterxml.jackson.dataformat.xml;

import java.util.Collection;

import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.ObjectMapper.DefaultTyping;
import com.fasterxml.jackson.databind.cfg.MapperConfig;
import com.fasterxml.jackson.databind.jsontype.NamedType;
import com.fasterxml.jackson.databind.jsontype.PolymorphicTypeValidator;
import com.fasterxml.jackson.databind.jsontype.TypeIdResolver;
import com.fasterxml.jackson.databind.jsontype.impl.StdTypeResolverBuilder;

import com.fasterxml.jackson.dataformat.xml.util.StaxUtil;

/**
 * Sub-class of {@code StdTypeResolverBuilder} specifically used with
 * Default Typing.
 *<p>
 * Composition/sub-classing gets quite tricky here: ideally we would just
 * extend {@link XmlTypeResolverBuilder} but unfortunately inheritance hierarchy
 * does not allow this.
 *
 * @since 2.10
 */
public class DefaultingXmlTypeResolverBuilder
    extends ObjectMapper.DefaultTypeResolverBuilder
    implements java.io.Serializable
{
    private static final long serialVersionUID = 1L;

    public DefaultingXmlTypeResolverBuilder(DefaultTyping t, PolymorphicTypeValidator ptv) {
        super(t, ptv);
    }

    /*
    /**********************************************************************
    /* Methods copied from `XmlTypeResolverBuilder`
    /**********************************************************************
     */

    @Override
    public StdTypeResolverBuilder init(JsonTypeInfo.Id idType, TypeIdResolver idRes)
    {
        super.init(idType, idRes);
        if (_typeProperty != null) {
            _typeProperty = StaxUtil.sanitizeXmlTypeName(_typeProperty);
        }
        return this;
    }

    @Override
    public StdTypeResolverBuilder typeProperty(String typeIdPropName)
    {
        // ok to have null/empty; will restore to use defaults
        if (typeIdPropName == null || typeIdPropName.length() == 0) {
            typeIdPropName = _idType.getDefaultPropertyName();
        }
        _typeProperty = StaxUtil.sanitizeXmlTypeName(typeIdPropName);
        return this;
    }

    @Override
    protected TypeIdResolver idResolver(MapperConfig<?> config,
            JavaType baseType, PolymorphicTypeValidator subtypeValidator,
            Collection<NamedType> subtypes, boolean forSer, boolean forDeser)
    {
        if (_customIdResolver != null) {
            return _customIdResolver;
        }
        // Only override handlers of class, minimal class; name is good as is
        switch (_idType) {
        case CLASS:
            return new XmlTypeResolverBuilder.XmlClassNameIdResolver(baseType, config.getTypeFactory(),
                    subTypeValidator(config));
        case MINIMAL_CLASS:
            return new XmlTypeResolverBuilder.XmlMinimalClassNameIdResolver(baseType, config.getTypeFactory(),
                    subTypeValidator(config));
        default:
        }
        return super.idResolver(config, baseType, subtypeValidator, subtypes, forSer, forDeser);
    }
}

⏎ com/fasterxml/jackson/dataformat/xml/DefaultingXmlTypeResolverBuilder.java

Or download all of them as a single archive file:

File name: jackson-dataformat-xml-2.14.0-sources.jar
File size: 98015 bytes
Release date: 2022-11-05
Download 

⇒ Download Jackson Dataformat Binary Packages

⇐ Jackson Dataformat Extensions

⇑ Downloading and Reviewing jackson-*.jar

⇑⇑ Jackson - Java JSON library