ServiceResponseDecoder.java
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00001 /*
00002  * Copyright (C) 2011 Google Inc.
00003  * 
00004  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
00005  * use this file except in compliance with the License. You may obtain a copy of
00006  * the License at
00007  * 
00008  * http://www.apache.org/licenses/LICENSE-2.0
00009  * 
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
00012  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
00013  * License for the specific language governing permissions and limitations under
00014  * the License.
00015  */
00016 
00017 package org.ros.internal.node.service;
00018 
00019 import org.jboss.netty.buffer.ChannelBuffer;
00020 import org.jboss.netty.channel.Channel;
00021 import org.jboss.netty.channel.ChannelHandlerContext;
00022 import org.jboss.netty.handler.codec.replay.ReplayingDecoder;
00023 
00029 class ServiceResponseDecoder<ResponseType> extends
00030     ReplayingDecoder<ServiceResponseDecoderState> {
00031 
00032   private ServiceServerResponse response;
00033 
00034   public ServiceResponseDecoder() {
00035     reset();
00036   }
00037 
00038   @SuppressWarnings("fallthrough")
00039   @Override
00040   protected Object decode(ChannelHandlerContext ctx, Channel channel, ChannelBuffer buffer,
00041       ServiceResponseDecoderState state) throws Exception {
00042     switch (state) {
00043       case ERROR_CODE:
00044         response.setErrorCode(buffer.readByte());
00045         checkpoint(ServiceResponseDecoderState.MESSAGE_LENGTH);
00046       case MESSAGE_LENGTH:
00047         response.setMessageLength(buffer.readInt());
00048         checkpoint(ServiceResponseDecoderState.MESSAGE);
00049       case MESSAGE:
00050         response.setMessage(buffer.readBytes(response.getMessageLength()));
00051         try {
00052           return response;
00053         } finally {
00054           reset();
00055         }
00056       default:
00057         throw new IllegalStateException();
00058     }
00059   }
00060 
00061   private void reset() {
00062     checkpoint(ServiceResponseDecoderState.ERROR_CODE);
00063     response = new ServiceServerResponse();
00064   }
00065 }


rosjava_core
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autogenerated on Wed Aug 26 2015 16:06:49