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/*
 * Licensed to Elastic Search and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Elastic Search 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.elasticsearch.util.io;

import org.elasticsearch.util.Classes;

import java.io.*;

/**
 * @author kimchy (Shay Banon)
 */
class CompactObjectInputStream extends ObjectInputStream {

    private final ClassLoader classLoader;

    CompactObjectInputStream(InputStream in) throws IOException {
        this(in, null);
    }

    CompactObjectInputStream(InputStream in, ClassLoader classLoader) throws IOException {
        super(in);
        this.classLoader = classLoader;
    }

    @Override protected void readStreamHeader() throws IOException,
            StreamCorruptedException {
        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 = loadClass(className);
                return ObjectStreamClass.lookup(clazz);
            default:
                throw new StreamCorruptedException(
                        "Unexpected class descriptor type: " + type);
        }
    }

    @Override protected Class resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException {
        String className = desc.getName();
        try {
            return loadClass(className);
        } catch (ClassNotFoundException ex) {
            return super.resolveClass(desc);
        }
    }

    protected Class loadClass(String className) throws ClassNotFoundException {
        Class clazz;
        ClassLoader classLoader = this.classLoader;
        if (classLoader == null) {
            classLoader = Classes.getDefaultClassLoader();
        }

        if (classLoader != null) {
            clazz = classLoader.loadClass(className);
        } else {
            clazz = Class.forName(className);
        }
        return clazz;
    }
}