framework/src/main/java/org/apache/felix/framework/util/ObjectInputStreamX.java

/* 
 * 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.felix.framework.util;

import java.io.*;

import org.apache.felix.moduleloader.IModule;

/**
 * The ObjectInputStreamX class is a simple extension to the ObjectInputStream
 * class.  The purpose of ObjectInputStreamX is to allow objects to be deserialized
 * when their classes are not in the CLASSPATH (e.g., in a JAR file).
 */
public class ObjectInputStreamX extends ObjectInputStream
{
    private IModule m_module = null;

    /**
     * Construct an ObjectInputStreamX for the specified InputStream and the specified
     * ClassLoader.
     * @param in the input stream to read.
     * @param loader the class loader used to resolve classes.
     */
    public ObjectInputStreamX(InputStream in, IModule module)
        throws IOException, StreamCorruptedException
    {
        super(in);
        m_module = module;
    }

    /**
     * By overloading this method, the ObjectInputStreamX can resolve a class
     * from the class loader that was passed into it at construction time.
     */
    protected Class resolveClass(ObjectStreamClass v)
        throws IOException, ClassNotFoundException
    {
        return m_module.getClass(v.getName());
    }
}