com.cloudhopper.smpp.channel.SmppSessionPduDecoder.java Source code

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Here is the source code for com.cloudhopper.smpp.channel.SmppSessionPduDecoder.java

Source

package com.cloudhopper.smpp.channel;

/*
 * #%L
 * ch-smpp
 * %%
 * Copyright (C) 2009 - 2012 Cloudhopper by Twitter
 * %%
 * 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.
 * #L%
 */

import com.cloudhopper.smpp.pdu.Pdu;
import com.cloudhopper.smpp.transcoder.PduTranscoder;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;

import java.util.List;

/**
 * Channel handler responsible for decoding a ChannelBuffer into a PDU.  A
 * decoded PDU is then passed up the pipeline for further processing.
 * 
 * @author joelauer (twitter: @jjlauer or <a href="http://twitter.com/jjlauer" target=window>http://twitter.com/jjlauer</a>)
 */
public class SmppSessionPduDecoder extends ByteToMessageDecoder {

    private final PduTranscoder transcoder;

    public SmppSessionPduDecoder(PduTranscoder transcoder) {
        this.transcoder = transcoder;
    }

    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
        // try to decode the frame into a PDU
        // NOTE: this already returns null if there isn't enough data yet
        Pdu pdu = transcoder.decode(in);

        if (pdu != null)
            out.add(pdu);
    }
}