addmessagedecoder.java

来自「mina是以Java实现的一个开源的网络程序框架」· Java 代码 · 共 56 行

/*
 *  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.mina.example.sumup.codec;

import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.example.sumup.message.AbstractMessage;
import org.apache.mina.example.sumup.message.AddMessage;
import org.apache.mina.filter.codec.ProtocolDecoderOutput;
import org.apache.mina.filter.codec.demux.MessageDecoder;

/**
 * A {@link MessageDecoder} that decodes {@link AddMessage}.
 *
 * @author The Apache MINA Project ([e-mail])
 * @version $Rev: 671827 $, $Date: 2008-06-26 10:49:48 +0200 (Thu, 26 Jun 2008) $
 */
public class AddMessageDecoder extends AbstractMessageDecoder {

    public AddMessageDecoder() {
        super(Constants.ADD);
    }

    @Override
    protected AbstractMessage decodeBody(IoSession session, IoBuffer in) {
        if (in.remaining() < Constants.ADD_BODY_LEN) {
            return null;
        }

        AddMessage m = new AddMessage();
        m.setValue(in.getInt());
        return m;
    }

    public void finishDecode(IoSession session, ProtocolDecoderOutput out)
            throws Exception {
    }
}