/*
* Copyright (c) 2001-2008 Caucho Technology, Inc. All rights reserved.
*
* The Apache Software License, Version 1.1
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Caucho Technology (http://www.caucho.com/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "Burlap", "Resin", and "Caucho" must not be used to
* endorse or promote products derived from this software without prior
* written permission. For written permission, please contact
* info@caucho.com.
*
* 5. Products derived from this software may not be called "Resin"
* nor may "Resin" appear in their names without prior written
* permission of Caucho Technology.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL CAUCHO TECHNOLOGY OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @author Scott Ferguson
*/
package com.caucho.hessian4.io;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.caucho.hessian4.HessianException;
/**
* Serializing an object for known object types.
*/
public class WriteReplaceSerializer extends AbstractSerializer
{
private static final Logger log
= Logger.getLogger(WriteReplaceSerializer.class.getName());
private static Object []NULL_ARGS = new Object[0];
private Object _writeReplaceFactory;
private Method _writeReplace;
public WriteReplaceSerializer(Class cl,
ClassLoader loader)
{
introspectWriteReplace(cl, loader);
}
private void introspectWriteReplace(Class cl, ClassLoader loader)
{
try {
String className = cl.getName() + "HessianSerializer";
Class serializerClass = Class.forName(className, false, loader);
Object serializerObject = serializerClass.newInstance();
Method writeReplace = getWriteReplace(serializerClass, cl);
if (writeReplace != null) {
_writeReplaceFactory = serializerObject;
_writeReplace = writeReplace;
}
} catch (ClassNotFoundException e) {
} catch (Exception e) {
log.log(Level.FINER, e.toString(), e);
}
_writeReplace = getWriteReplace(cl);
if (_writeReplace != null)
_writeReplace.setAccessible(true);
}
/**
* Returns the writeReplace method
*/
protected static Method getWriteReplace(Class cl, Class param)
{
for (; cl != null; cl = cl.getSuperclass()) {
for (Method method : cl.getDeclaredMethods()) {
if (method.getName().equals("writeReplace")
&& method.getParameterTypes().length == 1
&& param.equals(method.getParameterTypes()[0]))
return method;
}
}
return null;
}
/**
* Returns the writeReplace method
*/
protected static Method getWriteReplace(Class cl)
{
for (; cl != null; cl = cl.getSuperclass()) {
Method []methods = cl.getDeclaredMethods();
for (int i = 0; i < methods.length; i++) {
Method method = methods[i];
if (method.getName().equals("writeReplace") &&
method.getParameterTypes().length == 0)
return method;
}
}
return null;
}
public void writeObject(Object obj, AbstractHessianOutput out)
throws IOException
{
if (out.addRef(obj)) {
return;
}
Class cl = obj.getClass();
try {
Object repl;
if (_writeReplaceFactory != null)
repl = _writeReplace.invoke(_writeReplaceFactory, obj);
else
repl = _writeReplace.invoke(obj);
if (obj == repl)
throw new HessianException(this + ": Hessian writeReplace error. The writeReplace method (" + _writeReplace + ") must not return the same object: " + obj);
out.removeRef(obj);
out.writeObject(repl);
out.replaceRef(repl, obj);
} catch (RuntimeException e) {
throw e;
} catch (InvocationTargetException e) {
throw new RuntimeException(e.getCause());
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}