/*
 * Javassist, a Java-bytecode translator toolkit.
 * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License.  Alternatively, the contents of this file may be used under
 * the terms of the GNU Lesser General Public License Version 2.1 or later,
 * or the Apache License Version 2.0.
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 */

package javassist.util.proxy;

import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;

An input stream class which knows how to deserialize proxies created via ProxyFactory and serializedo via a ProxyObjectOutputStream. It must be used when deserialising proxies created from a proxy factory configured with ProxyFactory.useWriteReplace set to false. 
Author:
Andrew Dinn/**
 * An input stream class which knows how to deserialize proxies created via {@link ProxyFactory} and
 * serializedo via a {@link ProxyObjectOutputStream}. It must be used when deserialising proxies created
 * from a proxy factory configured with {@link ProxyFactory#useWriteReplace} set to false.
 *
 * @author Andrew Dinn
 */
public class ProxyObjectInputStream extends ObjectInputStream
{
    
create an input stream which can be used to deserialize an object graph which includes proxies created
using class ProxyFactory. the classloader used to resolve proxy superclass and interface names
read from the input stream will default to the current thread's context class loader or the system
classloader if the context class loader is null.
Params:
in – 
Throws:
StreamCorruptedException – whenever ObjectInputStream would also do so
IOException – whenever ObjectInputStream would also do so
SecurityException – whenever ObjectInputStream would also do so
NullPointerException – if in is null/**
     * create an input stream which can be used to deserialize an object graph which includes proxies created
     * using class ProxyFactory. the classloader used to resolve proxy superclass and interface names
     * read from the input stream will default to the current thread's context class loader or the system
     * classloader if the context class loader is null.
     * @param in
     * @throws java.io.StreamCorruptedException whenever ObjectInputStream would also do so
     * @throws	IOException whenever ObjectInputStream would also do so
     * @throws	SecurityException whenever ObjectInputStream would also do so
     * @throws NullPointerException if in is null
     */
    public ProxyObjectInputStream(InputStream in) throws IOException
    {
        super(in);
        loader = Thread.currentThread().getContextClassLoader();
        if (loader == null) {
            loader = ClassLoader.getSystemClassLoader();
        }
    }

    
Reset the loader to be
Params:
loader – /**
     * Reset the loader to be
     * @param loader
     */
    public void setClassLoader(ClassLoader loader)
    {
        if (loader != null) {
            this.loader = loader;
        } else {
            loader = ClassLoader.getSystemClassLoader();
        }
    }

    @Override
    protected ObjectStreamClass readClassDescriptor() throws IOException, ClassNotFoundException {
        boolean isProxy = readBoolean();
        if (isProxy) {
            String name = (String)readObject();
            Class<?> superClass = loader.loadClass(name);
            int length = readInt();
            Class<?>[] interfaces = new Class[length];
            for (int i = 0; i < length; i++) {
                name = (String)readObject();
                interfaces[i] = loader.loadClass(name);
            }
            length = readInt();
            byte[] signature = new byte[length];
            read(signature);
            ProxyFactory factory = new ProxyFactory();
            // we must always use the cache and never use writeReplace when using
            // ProxyObjectOutputStream and ProxyObjectInputStream
            factory.setUseCache(true);
            factory.setUseWriteReplace(false);
            factory.setSuperclass(superClass);
            factory.setInterfaces(interfaces);
            Class<?> proxyClass = factory.createClass(signature);
            return ObjectStreamClass.lookup(proxyClass);
        }
        return super.readClassDescriptor();
    }

    
the loader to use to resolve classes for proxy superclass and interface names read
from the stream. defaults to the context class loader of the thread which creates
the input stream or the system class loader if the context class loader is null.
/**
     * the loader to use to resolve classes for proxy superclass and interface names read
     * from the stream. defaults to the context class loader of the thread which creates
     * the input stream or the system class loader if the context class loader is null.
     */
    private ClassLoader loader;
}