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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.qpid.client.util;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;
import java.lang.reflect.Proxy;
import java.util.HashMap;
/**
* <code>ClassLoadingAwareObjectInputStream</code> is an Extention of Object input stream to be used
* to de-serialize JMS Object Messages.
*
* <p>This was introduced to resolve the class loading issues which can happen when we use the client
* libraries in a complex class loading Environment.</p>
*/
public class ClassLoadingAwareObjectInputStream extends ObjectInputStream
{
/** <p>Class loader instance which loaded this class.
* It will be used to load classes when we failed to load classes from dynamic class loading</p> */
private static final ClassLoader _ON_FAULT_CLASS_LOADER =
ClassLoadingAwareObjectInputStream.class.getClassLoader();
/** <p>Maps primitive type names to corresponding class objects.</p> */
private static final HashMap<String, Class> _primitives = new HashMap<String, Class>(8, 1.0F);
public ClassLoadingAwareObjectInputStream(InputStream in) throws IOException
{
super(in);
}
@Override
protected Class resolveClass(ObjectStreamClass classDesc)
throws IOException, ClassNotFoundException
{
// Here we use TTCL as our primary class loader to load the classes
ClassLoader cl = Thread.currentThread().getContextClassLoader();
return load(classDesc.getName(), cl);
}
@Override
protected Class resolveProxyClass(String[] interfaces)
throws IOException, ClassNotFoundException
{
// Here we use TTCL as our primary class loader to load the classes
ClassLoader cl = Thread.currentThread().getContextClassLoader();
Class[] cinterfaces = new Class[interfaces.length];
for (int i = 0; i < interfaces.length; i++)
{
cinterfaces[i] = load(interfaces[i], cl);
}
try
{
return Proxy.getProxyClass(cinterfaces[0].getClassLoader(), cinterfaces);
}
catch (IllegalArgumentException e)
{
throw new ClassNotFoundException(null, e);
}
}
/**
* <p>
* Method we used to load class that are needed to de-serialize the objects. </p>
* <p>
* Here we first look up for the objects from the given class loader and if its not there
* we will be using the class loader of this class.
* </p>
* @param className Class name to lookup
* @param cl primary class loader which we 1st use to lookup
* @return Class instance we are looking for
* @throws ClassNotFoundException if both primary and secondary lockup's failed.
*/
private Class load(String className, ClassLoader cl)
throws ClassNotFoundException
{
try
{
return Class.forName(className, false, cl);
}
catch (ClassNotFoundException e)
{
final Class clazz = _primitives.get(className);
if (clazz != null)
{
return clazz;
}
else
{
return Class.forName(className, false, _ON_FAULT_CLASS_LOADER);
}
}
}
static
{
_primitives.put("boolean", boolean.class);
_primitives.put("byte", byte.class);
_primitives.put("char", char.class);
_primitives.put("short", short.class);
_primitives.put("int", int.class);
_primitives.put("long", long.class);
_primitives.put("float", float.class);
_primitives.put("double", double.class);
_primitives.put("void", void.class);
}
}
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