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/ext/CoreXMLDeserializers.java

package com.fasterxml.jackson.databind.ext;

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

import javax.xml.datatype.*;
import javax.xml.namespace.QName;

import com.fasterxml.jackson.core.*;

import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.Deserializers;
import com.fasterxml.jackson.databind.deser.std.FromStringDeserializer;

/**
 * Container deserializers that handle "core" XML types: ones included in standard
 * JDK 1.5. Types are directly needed by JAXB, but may be unavailable on some
 * limited platforms; hence separate out from basic deserializer factory.
 */
public class CoreXMLDeserializers extends Deserializers.Base
{
    /**
     * Data type factories are thread-safe after instantiation (and
     * configuration, if any); and since instantion (esp. implementation
     * introspection) can be expensive we better reuse the instance.
     */
    final static DatatypeFactory _dataTypeFactory;
    static {
        try {
            _dataTypeFactory = DatatypeFactory.newInstance();
        } catch (DatatypeConfigurationException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public JsonDeserializer<?> findBeanDeserializer(JavaType type,
        DeserializationConfig config, BeanDescription beanDesc)
    {
        Class<?> raw = type.getRawClass();
        if (raw == QName.class) {
            return new Std(raw, TYPE_QNAME);
        }
        if (raw == XMLGregorianCalendar.class) {
            return new Std(raw, TYPE_G_CALENDAR);
        }
        if (raw == Duration.class) {
            return new Std(raw, TYPE_DURATION);
        }
        return null;
    }

    @Override // since 2.11
    public boolean hasDeserializerFor(DeserializationConfig config, Class<?> valueType) {
        return (valueType == QName.class)
                || (valueType == XMLGregorianCalendar.class)
                || (valueType == Duration.class)
                ;
    }

    /*
    /**********************************************************
    /* Concrete deserializers
    /**********************************************************
     */

    protected final static int TYPE_DURATION = 1;
    protected final static int TYPE_G_CALENDAR = 2;
    protected final static int TYPE_QNAME = 3;

    /**
     * Combo-deserializer that supports deserialization of somewhat optional
     * javax.xml types {@link QName}, {@link Duration} and {@link XMLGregorianCalendar}.
     * Combined into a single class to eliminate bunch of one-off implementation
     * classes, to reduce resulting jar size (mostly).
     *
     * @since 2.4
     */
    public static class Std extends FromStringDeserializer<Object>
    {
        private static final long serialVersionUID = 1L;

        protected final int _kind;

        public Std(Class<?> raw, int kind) {
            super(raw);
            _kind = kind;
        }

        @Override
        public Object deserialize(JsonParser p, DeserializationContext ctxt)
            throws IOException
        {
            // For most types, use super impl; but GregorianCalendar also allows
            // integer value (timestamp), which needs separate handling
            if (_kind == TYPE_G_CALENDAR) {
                if (p.hasToken(JsonToken.VALUE_NUMBER_INT)) {
                    return _gregorianFromDate(ctxt, _parseDate(p, ctxt));
                }
            }
            return super.deserialize(p, ctxt);
        }

        @Override
        protected Object _deserialize(String value, DeserializationContext ctxt)
            throws IOException
        {
            switch (_kind) {
            case TYPE_DURATION:
                return _dataTypeFactory.newDuration(value);
            case TYPE_QNAME:
                return QName.valueOf(value);
            case TYPE_G_CALENDAR:
                Date d;
                try {
                    d = _parseDate(value, ctxt);
                }
                catch (JsonMappingException e) {
                    // try to parse from native XML Schema 1.0 lexical representation String,
                    // which includes time-only formats not handled by parseXMLGregorianCalendarFromJacksonFormat(...)
                    return _dataTypeFactory.newXMLGregorianCalendar(value);
                }
                return _gregorianFromDate(ctxt, d);
            }
            throw new IllegalStateException();
        }

        protected XMLGregorianCalendar _gregorianFromDate(DeserializationContext ctxt,
                Date d)
        {
            if (d == null) {
                return null;
            }
            GregorianCalendar calendar = new GregorianCalendar();
            calendar.setTime(d);
            TimeZone tz = ctxt.getTimeZone();
            if (tz != null) {
                calendar.setTimeZone(tz);
            }
            return _dataTypeFactory.newXMLGregorianCalendar(calendar);
        }
    }
}

⏎ com/fasterxml/jackson/databind/ext/CoreXMLDeserializers.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
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