/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.apache.activemq.transport.amqp;

import org.apache.activemq.util.ByteArrayInputStream;
import org.apache.activemq.util.ByteArrayOutputStream;
import org.apache.activemq.util.ByteSequence;
import org.apache.activemq.wireformat.WireFormat;
import org.fusesource.hawtbuf.Buffer;

import java.io.*;

/**
 */
public class AmqpWireFormat implements WireFormat {


    private int version = 1;
    private long maxFrameLength = 1024*1024*100;

    public ByteSequence marshal(Object command) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(baos);
        marshal(command, dos);
        dos.close();
        return baos.toByteSequence();
    }

    public Object unmarshal(ByteSequence packet) throws IOException {
        ByteArrayInputStream stream = new ByteArrayInputStream(packet);
        DataInputStream dis = new DataInputStream(stream);
        return unmarshal(dis);
    }

    public void marshal(Object command, DataOutput dataOut) throws IOException {
        Buffer frame = (Buffer) command;
        frame.writeTo(dataOut);
    }

    boolean magicRead = false;
    public Object unmarshal(DataInput dataIn) throws IOException {
        if( !magicRead ) {
            Buffer magic = new Buffer(8);
            magic.readFrom(dataIn);
            magicRead = true;
            return magic;
        } else {
            int size = dataIn.readInt();
            if( size > maxFrameLength ) {
                throw new AmqpProtocolException("Frame size exceeded max frame length.");
            }
            Buffer frame = new Buffer(size);
            frame.bigEndianEditor().writeInt(size);
            frame.readFrom(dataIn);
            frame.clear();
            return frame;
        }
    }

    /**
     */
    public void setVersion(int version) {
        this.version = version;
    }

    /**
     * @return the version of the wire format
     */
    public int getVersion() {
        return this.version;
    }


}
