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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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.jboss.netty.handler.codec.serialization;

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

class CompactObjectInputStream extends ObjectInputStream {

    private final ClassResolver classResolver;

    CompactObjectInputStream(InputStream in, ClassResolver classResolver) throws IOException {
        super(in);
        if (classResolver == null) {
            throw new NullPointerException("classResolver");
        }
        this.classResolver = classResolver;
    }

    @Override
    protected void readStreamHeader() throws IOException {
        int version = readByte() & 0xFF;
        if (version != STREAM_VERSION) {
            throw new StreamCorruptedException(
                    "Unsupported version: " + version);
        }
    }

    @Override
    protected ObjectStreamClass readClassDescriptor()
            throws IOException, ClassNotFoundException {
        int type = read();
        if (type < 0) {
            throw new EOFException();
        }
        switch (type) {
        case CompactObjectOutputStream.TYPE_FAT_DESCRIPTOR:
            return super.readClassDescriptor();
        case CompactObjectOutputStream.TYPE_THIN_DESCRIPTOR:
            String className = readUTF();
            Class clazz = classResolver.resolve(className);
            ObjectStreamClass streamClass = ObjectStreamClass.lookup(clazz);
            if (streamClass == null) {
                // If streamClass is null its very likely that we had an old netty version that was writing an
                // interface with a thin descriptor. Fall back to use ObjectStreamClazz.lookupAny(..) to resolve
                // it.
                //
                // This will only work on java6+ but if we hit this line its very likely that a user is upgrading
                // from netty 3.2.x which was using the method before and so use java6+.
                //
                // See https://github.com/netty/netty/commit/6c2eba79d70a532822a0e38092faa9783d90906b
                streamClass = ObjectStreamClass.lookupAny(clazz);
            }
            return streamClass;
        default:
            throw new StreamCorruptedException(
                    "Unexpected class descriptor type: " + type);
        }
    }

    @Override
    protected Class resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException {
        Class clazz;
        try {
            clazz = classResolver.resolve(desc.getName());
        } catch (ClassNotFoundException ex) {
            clazz = super.resolveClass(desc);
        }

        return clazz;
    }

}