/*
 * 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.onlab.onos.openflow.controller.impl;

import java.util.List;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.handler.codec.oneone.OneToOneEncoder;
import org.projectfloodlight.openflow.protocol.OFMessage;


/**
 * Encode an openflow message for output into a ChannelBuffer, for use in a
 * netty pipeline.
 */
public class OFMessageEncoder extends OneToOneEncoder {

    @Override
    protected Object encode(ChannelHandlerContext ctx, Channel channel,
                            Object msg) throws Exception {
        if (!(msg instanceof List)) {
            return msg;
        }

        @SuppressWarnings("unchecked")
        List<OFMessage> msglist = (List<OFMessage>) msg;
        /* XXX S can't get length of OFMessage in loxigen's openflowj??
        int size = 0;
        for (OFMessage ofm : msglist) {
            size += ofm.getLengthU();
        }*/

        ChannelBuffer buf = ChannelBuffers.dynamicBuffer();

        for (OFMessage ofm : msglist) {
            ofm.writeTo(buf);
        }
        return buf;
    }

}