001/*
002 *   Licensed to the Apache Software Foundation (ASF) under one
003 *   or more contributor license agreements.  See the NOTICE file
004 *   distributed with this work for additional information
005 *   regarding copyright ownership.  The ASF licenses this file
006 *   to you under the Apache License, Version 2.0 (the
007 *   "License"); you may not use this file except in compliance
008 *   with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *   Unless required by applicable law or agreed to in writing,
013 *   software distributed under the License is distributed on an
014 *   "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *   KIND, either express or implied.  See the License for the
016 *   specific language governing permissions and limitations
017 *   under the License.
018 *
019 */
020package org.apache.mina.example.imagine.step1.codec;
021
022import org.apache.mina.core.buffer.IoBuffer;
023import org.apache.mina.core.session.IoSession;
024import org.apache.mina.example.imagine.step1.ImageRequest;
025import org.apache.mina.filter.codec.CumulativeProtocolDecoder;
026import org.apache.mina.filter.codec.ProtocolDecoderOutput;
027
028/**
029 * a decoder for {@link ImageRequest} objects
030 *
031 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
032 */
033
034public class ImageRequestDecoder extends CumulativeProtocolDecoder {
035    
036    protected boolean doDecode(IoSession session, IoBuffer in, ProtocolDecoderOutput out) throws Exception {
037        if (in.remaining() >= 12) {
038            int width = in.getInt();
039            int height = in.getInt();
040            int numberOfCharachters = in.getInt();
041            ImageRequest request = new ImageRequest(width, height, numberOfCharachters);
042            out.write(request);
043            return true;
044        } else {
045            return false;
046        }
047    }
048}