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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
/*
* Copyright (C) 2004, 2005 Joe Walnes.
* Copyright (C) 2006, 2007, 2008, 2010, 2013, 2018 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 25. March 2004 by Joe Walnes
*/
package com.feilong.lib.xstream.converters.extended;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.util.List;
import com.feilong.lib.xstream.converters.ConversionException;
import com.feilong.lib.xstream.converters.Converter;
import com.feilong.lib.xstream.converters.MarshallingContext;
import com.feilong.lib.xstream.converters.UnmarshallingContext;
import com.feilong.lib.xstream.core.ClassLoaderReference;
import com.feilong.lib.xstream.core.util.Fields;
import com.feilong.lib.xstream.io.HierarchicalStreamReader;
import com.feilong.lib.xstream.io.HierarchicalStreamWriter;
import com.feilong.lib.xstream.mapper.DynamicProxyMapper;
import com.feilong.lib.xstream.mapper.Mapper;
/**
* Converts a dynamic proxy to XML, storing the implemented
* interfaces and handler.
*
* @author Joe Walnes
*/
public class DynamicProxyConverter implements Converter{
private ClassLoaderReference classLoaderReference;
private Mapper mapper;
private static final Field HANDLER = Fields.locate(Proxy.class, InvocationHandler.class, false);
private static final InvocationHandler DUMMY = (proxy,method,args) -> null;
/**
* @deprecated As of 1.4.5 use {@link #DynamicProxyConverter(Mapper, ClassLoaderReference)}
*/
@Deprecated
public DynamicProxyConverter(Mapper mapper){
this(mapper, DynamicProxyConverter.class.getClassLoader());
}
/**
* Construct a DynamicProxyConverter.
*
* @param mapper
* the Mapper chain
* @param classLoaderReference
* the reference to the {@link ClassLoader} of the XStream instance
* @since 1.4.5
*/
public DynamicProxyConverter(Mapper mapper, ClassLoaderReference classLoaderReference){
this.classLoaderReference = classLoaderReference;
this.mapper = mapper;
}
/**
* @deprecated As of 1.4.5 use {@link #DynamicProxyConverter(Mapper, ClassLoaderReference)}
*/
@Deprecated
public DynamicProxyConverter(Mapper mapper, ClassLoader classLoader){
this(mapper, new ClassLoaderReference(classLoader));
}
@Override
public boolean canConvert(Class type){
return type != null && (type.equals(DynamicProxyMapper.DynamicProxy.class) || Proxy.isProxyClass(type));
}
@Override
public void marshal(Object source,HierarchicalStreamWriter writer,MarshallingContext context){
InvocationHandler invocationHandler = Proxy.getInvocationHandler(source);
addInterfacesToXml(source, writer);
writer.startNode("handler");
String attributeName = mapper.aliasForSystemAttribute("class");
if (attributeName != null){
writer.addAttribute(attributeName, mapper.serializedClass(invocationHandler.getClass()));
}
context.convertAnother(invocationHandler);
writer.endNode();
}
private void addInterfacesToXml(Object source,HierarchicalStreamWriter writer){
Class[] interfaces = source.getClass().getInterfaces();
for (Class currentInterface : interfaces){
writer.startNode("interface");
writer.setValue(mapper.serializedClass(currentInterface));
writer.endNode();
}
}
@Override
public Object unmarshal(HierarchicalStreamReader reader,UnmarshallingContext context){
List interfaces = new ArrayList();
InvocationHandler handler = null;
Class handlerType = null;
while (reader.hasMoreChildren()){
reader.moveDown();
String elementName = reader.getNodeName();
if (elementName.equals("interface")){
interfaces.add(mapper.realClass(reader.getValue()));
}else if (elementName.equals("handler")){
String attributeName = mapper.aliasForSystemAttribute("class");
if (attributeName != null){
handlerType = mapper.realClass(reader.getAttribute(attributeName));
break;
}
}
reader.moveUp();
}
if (handlerType == null){
throw new ConversionException("No InvocationHandler specified for dynamic proxy");
}
Class[] interfacesAsArray = new Class[interfaces.size()];
interfaces.toArray(interfacesAsArray);
Object proxy = null;
if (HANDLER != null){ // we will not be able to resolve references to the proxy
proxy = Proxy.newProxyInstance(classLoaderReference.getReference(), interfacesAsArray, DUMMY);
}
handler = (InvocationHandler) context.convertAnother(proxy, handlerType);
reader.moveUp();
if (HANDLER != null){
Fields.write(HANDLER, proxy, handler);
}else{
proxy = Proxy.newProxyInstance(classLoaderReference.getReference(), interfacesAsArray, handler);
}
return proxy;
}
}