001/****************************************************************
002 * Licensed to the Apache Software Foundation (ASF) under one   *
003 * or more contributor license agreements.  See the NOTICE file *
004 * distributed with this work for additional information        *
005 * regarding copyright ownership.  The ASF licenses this file   *
006 * to you under the Apache License, Version 2.0 (the            *
007 * "License"); you may not use this file except in compliance   *
008 * with the License.  You may obtain a copy of the License at   *
009 *                                                              *
010 *   http://www.apache.org/licenses/LICENSE-2.0                 *
011 *                                                              *
012 * Unless required by applicable law or agreed to in writing,   *
013 * software distributed under the License is distributed on an  *
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
015 * KIND, either express or implied.  See the License for the    *
016 * specific language governing permissions and limitations      *
017 * under the License.                                           *
018 ****************************************************************/
019
020package org.apache.james.repository.file;
021
022import java.io.IOException;
023import java.io.InputStream;
024import java.io.ObjectInputStream;
025import java.io.ObjectStreamClass;
026
027/**
028 * A special ObjectInputStream to handle highly transient classes hosted by
029 * Avalon components that are juggling many classloaders.
030 */
031public class ClassLoaderObjectInputStream extends ObjectInputStream {
032    private final ClassLoader m_classLoader;
033
034    public ClassLoaderObjectInputStream(ClassLoader classLoader, InputStream inputStream) throws IOException {
035        super(inputStream);
036        m_classLoader = classLoader;
037    }
038
039    protected Class<?> resolveClass(ObjectStreamClass objectStreamClass) throws IOException, ClassNotFoundException {
040        final Class<?> clazz = Class.forName(objectStreamClass.getName(), false, m_classLoader);
041
042        if (null != clazz) {
043            return clazz; // the classloader knows of the class
044        } else {
045            // classloader knows not of class, let the super classloader do it
046            return super.resolveClass(objectStreamClass);
047        }
048    }
049}