/*
* Copyright (C) 2009, 2013, 2014 XStream Committers.
* All rights reserved.
*
* The software in this package is published under the terms of the BSD
* style license a copy of which has been included with this distribution in
* the LICENSE.txt file.
*
* Created on 17. April 2009 by Joerg Schaible
*/
package com.thoughtworks.xstream.converters.extended;
import java.lang.reflect.Field;
import com.thoughtworks.xstream.InitializationException;
import com.thoughtworks.xstream.converters.ConversionException;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.SingleValueConverter;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.core.ClassLoaderReference;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.mapper.DefaultMapper;
import com.thoughtworks.xstream.mapper.Mapper;
/**
* Converts a {@link Field}.
*
* @author Jörg Schaible
*/
public class JavaFieldConverter implements Converter {
private final SingleValueConverter javaClassConverter;
private final Mapper mapper;
/**
* Construct a JavaFieldConverter.
*
* @param classLoaderReference the reference to the {@link ClassLoader} of the XStream instance
* @since 1.4.5
*/
public JavaFieldConverter(final ClassLoaderReference classLoaderReference) {
this(new JavaClassConverter(classLoaderReference), new DefaultMapper(classLoaderReference));
}
/**
* @deprecated As of 1.4.5 use {@link #JavaFieldConverter(ClassLoaderReference)}
*/
@Deprecated
public JavaFieldConverter(final ClassLoader classLoader) {
this(new ClassLoaderReference(classLoader));
}
/**
* Construct a JavaFieldConverter. Depending on the mapper chain the converter will also respect aliases.
*
* @param javaClassConverter the converter to use
* @param mapper to use
* @since 1.4.5
*/
protected JavaFieldConverter(final SingleValueConverter javaClassConverter, final Mapper mapper) {
if (!javaClassConverter.canConvert(Class.class)) {
throw new InitializationException("Java Class Converter cannot handle Class types");
}
this.javaClassConverter = javaClassConverter;
this.mapper = mapper;
}
@Override
public boolean canConvert(final Class<?> type) {
return type.equals(Field.class);
}
@Override
public void marshal(final Object source, final HierarchicalStreamWriter writer, final MarshallingContext context) {
final Field field = (Field)source;
final Class<?> type = field.getDeclaringClass();
writer.startNode("name");
writer.setValue(mapper.serializedMember(type, field.getName()));
writer.endNode();
writer.startNode("clazz");
writer.setValue(javaClassConverter.toString(type));
writer.endNode();
}
@Override
public Object unmarshal(final HierarchicalStreamReader reader, final UnmarshallingContext context) {
String methodName = null;
String declaringClassName = null;
while ((methodName == null || declaringClassName == null) && reader.hasMoreChildren()) {
reader.moveDown();
if (reader.getNodeName().equals("name")) {
methodName = reader.getValue();
} else if (reader.getNodeName().equals("clazz")) {
declaringClassName = reader.getValue();
}
reader.moveUp();
}
final Class<?> declaringClass = (Class<?>)javaClassConverter.fromString(declaringClassName);
try {
return declaringClass.getDeclaredField(mapper.realMember(declaringClass, methodName));
} catch (final NoSuchFieldException e) {
throw new ConversionException(e);
}
}
}