com.alibaba.dubbo.common.serialize.support.java.CompactedObjectInputStream Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of dubbo2 Show documentation

The all in one project of dubbo2

The newest version!

/*
 * Copyright 1999-2011 Alibaba Group.
 *  
 * Licensed 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 com.alibaba.dubbo.common.serialize.support.java;

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

import com.alibaba.dubbo.common.utils.ClassHelper;

/**
 * Compacted java object input stream.
 * 
 * @author qianlei
 */

public class CompactedObjectInputStream extends ObjectInputStream
{
	private ClassLoader mClassLoader;

	public CompactedObjectInputStream(InputStream in) throws IOException
	{
		this(in, Thread.currentThread().getContextClassLoader());
	}

	public CompactedObjectInputStream(InputStream in, ClassLoader cl) throws IOException
	{
		super(in);
		mClassLoader = cl == null ? ClassHelper.getClassLoader() : cl;
	}

	@Override
	protected ObjectStreamClass readClassDescriptor() throws IOException,ClassNotFoundException
	{
		int type = read();
		if( type < 0 )
			throw new EOFException();
		switch( type )
		{
			case 0:
				return super.readClassDescriptor();
			case 1:
				Class clazz = loadClass(readUTF());
				return ObjectStreamClass.lookup(clazz);
			default:
				throw new StreamCorruptedException("Unexpected class descriptor type: " + type);
		}
	}

	private Class loadClass(String className) throws ClassNotFoundException
	{
		return mClassLoader.loadClass(className);
	}
}