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Java example source code file (DatagramPacketDecoder.java)
This example Java source code file (DatagramPacketDecoder.java) is included in the alvinalexander.com
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The DatagramPacketDecoder.java Java example source code
/*
* Copyright 2016 The Netty Project
*
* The Netty Project 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 io.netty.handler.codec;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.DatagramPacket;
import io.netty.handler.codec.protobuf.ProtobufDecoder;
import static io.netty.util.internal.ObjectUtil.checkNotNull;
import java.util.List;
/**
* A decoder that decodes the content of the received {@link DatagramPacket} using
* the specified {@link ByteBuf} decoder. E.g.,
*
* <pre>
* {@link ChannelPipeline} pipeline = ...;
* pipeline.addLast("udpDecoder", new {@link DatagramPacketDecoder}(new {@link ProtobufDecoder}(...));
* </code>
*/
public class DatagramPacketDecoder extends MessageToMessageDecoder<DatagramPacket> {
private final MessageToMessageDecoder<ByteBuf> decoder;
/**
* Create a {@link DatagramPacket} decoder using the specified {@link ByteBuf} decoder.
*
* @param decoder the specified {@link ByteBuf} decoder
*/
public DatagramPacketDecoder(MessageToMessageDecoder<ByteBuf> decoder) {
this.decoder = checkNotNull(decoder, "decoder");
}
@Override
public boolean acceptInboundMessage(Object msg) throws Exception {
if (msg instanceof DatagramPacket) {
return decoder.acceptInboundMessage(((DatagramPacket) msg).content());
}
return false;
}
@Override
protected void decode(ChannelHandlerContext ctx, DatagramPacket msg, List<Object> out) throws Exception {
decoder.decode(ctx, msg.content(), out);
}
@Override
public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
decoder.channelRegistered(ctx);
}
@Override
public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
decoder.channelUnregistered(ctx);
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
decoder.channelActive(ctx);
}
@Override
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
decoder.channelInactive(ctx);
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
decoder.channelReadComplete(ctx);
}
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
decoder.userEventTriggered(ctx, evt);
}
@Override
public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception {
decoder.channelWritabilityChanged(ctx);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
decoder.exceptionCaught(ctx, cause);
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
decoder.handlerAdded(ctx);
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
decoder.handlerRemoved(ctx);
}
}
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