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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.commons.io.input;

import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;
import java.io.StreamCorruptedException;
import java.lang.reflect.Proxy;

/**
 * A special ObjectInputStream that loads a class based on a specified
 * {@link ClassLoader} rather than the system default.
 * 

* This is useful in dynamic container environments. *

* * @since 1.1 */ public class ClassLoaderObjectInputStream extends ObjectInputStream { /** The class loader to use. */ private final ClassLoader classLoader; /** * Constructs a new ClassLoaderObjectInputStream. * * @param classLoader the ClassLoader from which classes should be loaded * @param inputStream the InputStream to work on * @throws IOException in case of an I/O error * @throws StreamCorruptedException if the stream is corrupted */ public ClassLoaderObjectInputStream( final ClassLoader classLoader, final InputStream inputStream) throws IOException, StreamCorruptedException { super(inputStream); this.classLoader = classLoader; } /** * Resolve a class specified by the descriptor using the * specified ClassLoader or the super ClassLoader. * * @param objectStreamClass descriptor of the class * @return the Class object described by the ObjectStreamClass * @throws IOException in case of an I/O error * @throws ClassNotFoundException if the Class cannot be found */ @Override protected Class resolveClass(final ObjectStreamClass objectStreamClass) throws IOException, ClassNotFoundException { try { return Class.forName(objectStreamClass.getName(), false, classLoader); } catch (final ClassNotFoundException cnfe) { // delegate to super class loader which can resolve primitives return super.resolveClass(objectStreamClass); } } /** * Create a proxy class that implements the specified interfaces using * the specified ClassLoader or the super ClassLoader. * * @param interfaces the interfaces to implement * @return a proxy class implementing the interfaces * @throws IOException in case of an I/O error * @throws ClassNotFoundException if the Class cannot be found * @see java.io.ObjectInputStream#resolveProxyClass(String[]) * @since 2.1 */ @Override protected Class resolveProxyClass(final String[] interfaces) throws IOException, ClassNotFoundException { final Class[] interfaceClasses = new Class[interfaces.length]; for (int i = 0; i < interfaces.length; i++) { interfaceClasses[i] = Class.forName(interfaces[i], false, classLoader); } try { return Proxy.getProxyClass(classLoader, interfaceClasses); } catch (final IllegalArgumentException e) { return super.resolveProxyClass(interfaces); } } }




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