cmppmessageencoder.java

中国移动 cmpp3.0 短信 编程接口

/**
 *
 * Copyright 2006 Jason Zou.
 *
 *  Licensed 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 net.sf.cmpp.connect.codec;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import net.sf.cmpp.message.AbstractMessage;
import net.sf.cmpp.message.ActiveTestMessage;
import net.sf.cmpp.message.ActiveTestRespMessage;
import net.sf.cmpp.message.ConnectMessage;
import net.sf.cmpp.message.ConnectRespMessage;
import net.sf.cmpp.message.DeliverRespMessage;
import net.sf.cmpp.message.SubmitMessage;
import net.sf.cmpp.message.TerminateMessage;
import net.sf.cmpp.message.TerminateRespMessage;
import net.sf.cmpp.util.ByteUtil;

import org.apache.log4j.Logger;
import org.apache.mina.common.ByteBuffer;
import org.apache.mina.common.IoSession;
import org.apache.mina.filter.codec.ProtocolEncoderOutput;
import org.apache.mina.filter.codec.demux.MessageEncoder;

/**
 * A {@link MessageEncoder}that encodes message header and forwards the
 * encoding of body to a subclass.
 * 
 * @author The Apache Directory Project
 * @version $Rev: 355016 $, $Date: 2006/07/18 06:00:53 $
 */
public class CMPPMessageEncoder implements MessageEncoder {
    private static Logger logger = Logger.getLogger(CMPPMessageEncoder.class);

    String lSep = System.getProperty("line.separator");

    private static final Set TYPES;

    static {
        Set types = new HashSet();
        types.add(ConnectMessage.class);
        types.add(ConnectRespMessage.class);
        types.add(ActiveTestMessage.class);
        types.add(ActiveTestRespMessage.class);
        types.add(TerminateMessage.class);
        types.add(TerminateRespMessage.class);
        types.add(SubmitMessage.class);
        types.add(DeliverRespMessage.class);
        TYPES = Collections.unmodifiableSet(types);
    }

    public void encode(IoSession session, Object message,
            ProtocolEncoderOutput out) throws Exception {
        AbstractMessage m = (AbstractMessage) message;
        ByteBuffer buf = ByteBuffer.allocate(300);
        buf.setAutoExpand(true); // Enable auto-expand for easier encoding

        // Encode a header
        m.encodeHeader(buf);
        m.encodeBody(buf);
        int totalLength = buf.position();

        buf.putInt(0, totalLength); // rewrite the PDU's total length;

        buf.flip();

        // Log the buffer.
        logger.debug(lSep + "---------- Encoded Message--------------- " + lSep
                + ByteUtil.toHexForLog(buf) + lSep
                + "---------- End Encoded Message--------------- ");

        out.write(buf);
    }

    public Set getMessageTypes() {
        return TYPES;
    }

}