/*
 * 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 io.netty.handler.codec.serialization;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufOutputStream;
import io.netty.buffer.Unpooled;

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.io.OutputStream;

An ObjectOutput which is interoperable with ObjectDecoder and ObjectDecoderInputStream. /**
 * An {@link ObjectOutput} which is interoperable with {@link ObjectDecoder}
 * and {@link ObjectDecoderInputStream}.
 */
public class ObjectEncoderOutputStream extends OutputStream implements
        ObjectOutput {

    private final DataOutputStream out;
    private final int estimatedLength;

    
Creates a new ObjectOutput with the estimated length of 512 bytes. 
Params:
out –  the OutputStream where the serialized form will be written out/**
     * Creates a new {@link ObjectOutput} with the estimated length of 512
     * bytes.
     *
     * @param out
     *        the {@link OutputStream} where the serialized form will be
     *        written out
     */
    public ObjectEncoderOutputStream(OutputStream out) {
        this(out, 512);
    }

    
Creates a new ObjectOutput. 
Params:
out –  the OutputStream where the serialized form will be written out
estimatedLength – 
       the estimated byte length of the serialized form of an object.
       If the length of the serialized form exceeds this value, the
       internal buffer will be expanded automatically at the cost of
       memory bandwidth.  If this value is too big, it will also waste
       memory bandwidth.  To avoid unnecessary memory copy or allocation
       cost, please specify the properly estimated value./**
     * Creates a new {@link ObjectOutput}.
     *
     * @param out
     *        the {@link OutputStream} where the serialized form will be
     *        written out
     *
     * @param estimatedLength
     *        the estimated byte length of the serialized form of an object.
     *        If the length of the serialized form exceeds this value, the
     *        internal buffer will be expanded automatically at the cost of
     *        memory bandwidth.  If this value is too big, it will also waste
     *        memory bandwidth.  To avoid unnecessary memory copy or allocation
     *        cost, please specify the properly estimated value.
     */
    public ObjectEncoderOutputStream(OutputStream out, int estimatedLength) {
        if (out == null) {
            throw new NullPointerException("out");
        }
        if (estimatedLength < 0) {
            throw new IllegalArgumentException("estimatedLength: " + estimatedLength);
        }

        if (out instanceof DataOutputStream) {
            this.out = (DataOutputStream) out;
        } else {
            this.out = new DataOutputStream(out);
        }
        this.estimatedLength = estimatedLength;
    }

    @Override
    public void writeObject(Object obj) throws IOException {
        ByteBuf buf = Unpooled.buffer(estimatedLength);
        try {
            ObjectOutputStream oout = new CompactObjectOutputStream(new ByteBufOutputStream(buf));
            try {
                oout.writeObject(obj);
                oout.flush();
            } finally {
                oout.close();
            }

            int objectSize = buf.readableBytes();
            writeInt(objectSize);
            buf.getBytes(0, this, objectSize);
        } finally {
            buf.release();
        }
    }

    @Override
    public void write(int b) throws IOException {
        out.write(b);
    }

    @Override
    public void close() throws IOException {
        out.close();
    }

    @Override
    public void flush() throws IOException {
        out.flush();
    }

    public final int size() {
        return out.size();
    }

    @Override
    public void write(byte[] b, int off, int len) throws IOException {
        out.write(b, off, len);
    }

    @Override
    public void write(byte[] b) throws IOException {
        out.write(b);
    }

    @Override
    public final void writeBoolean(boolean v) throws IOException {
        out.writeBoolean(v);
    }

    @Override
    public final void writeByte(int v) throws IOException {
        out.writeByte(v);
    }

    @Override
    public final void writeBytes(String s) throws IOException {
        out.writeBytes(s);
    }

    @Override
    public final void writeChar(int v) throws IOException {
        out.writeChar(v);
    }

    @Override
    public final void writeChars(String s) throws IOException {
        out.writeChars(s);
    }

    @Override
    public final void writeDouble(double v) throws IOException {
        out.writeDouble(v);
    }

    @Override
    public final void writeFloat(float v) throws IOException {
        out.writeFloat(v);
    }

    @Override
    public final void writeInt(int v) throws IOException {
        out.writeInt(v);
    }

    @Override
    public final void writeLong(long v) throws IOException {
        out.writeLong(v);
    }

    @Override
    public final void writeShort(int v) throws IOException {
        out.writeShort(v);
    }

    @Override
    public final void writeUTF(String str) throws IOException {
        out.writeUTF(str);
    }
}