/*
* Copyright 2012 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.bytes;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import io.netty.handler.codec.MessageToMessageDecoder;
import java.util.List;
/**
* Decodes a received {@link ByteBuf} into an array of bytes.
* A typical setup for TCP/IP would be:
* <pre>
* {@link ChannelPipeline} pipeline = ...;
*
* // Decoders
* pipeline.addLast("frameDecoder",
* new {@link LengthFieldBasedFrameDecoder}(1048576, 0, 4, 0, 4));
* pipeline.addLast("bytesDecoder",
* new {@link ByteArrayDecoder}());
*
* // Encoder
* pipeline.addLast("frameEncoder", new {@link LengthFieldPrepender}(4));
* pipeline.addLast("bytesEncoder", new {@link ByteArrayEncoder}());
* </pre>
* and then you can use an array of bytes instead of a {@link ByteBuf}
* as a message:
* <pre>
* void channelRead({@link ChannelHandlerContext} ctx, byte[] bytes) {
* ...
* }
* </pre>
*/
public class ByteArrayDecoder extends MessageToMessageDecoder<ByteBuf> {
@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out) throws Exception {
// copy the ByteBuf content to a byte array
byte[] array = new byte[msg.readableBytes()];
msg.getBytes(0, array);
out.add(array);
}
}