001    /**
002     *
003     * Copyright 2004 Protique Ltd
004     *
005     * Licensed under the Apache License, Version 2.0 (the "License");
006     * you may not use this file except in compliance with the License.
007     * You may obtain a copy of the License at
008     *
009     * http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     *
017     **/
018    
019    
020    package org.activemq.io.impl;
021    import java.io.DataInput;
022    import java.io.IOException;
023    
024    import org.activemq.message.CachedValue;
025    import org.activemq.message.Packet;
026    
027    /**
028     * Reads a KeepAlive packet from a stream
029     * 
030     */
031    public class CachedValueReader extends AbstractPacketReader {
032    
033        /**
034         * Return the type of Packet
035         *
036         * @return integer representation of the type of Packet
037         */
038    
039        public int getPacketType() {
040            return Packet.CACHED_VALUE_COMMAND;
041        }
042    
043        /**
044         * @return a new Packet instance
045         */
046    
047        public Packet createPacket() {
048            return new CachedValue();
049        }
050    
051    
052        /**
053         * build a Packet instance from the data input stream
054         *
055         * @param packet A Packet object
056         * @param dataIn the data input stream to build the packet from
057         * @throws IOException
058         */
059    
060        public void buildPacket(Packet packet, DataInput dataIn) throws IOException {
061            CachedValue cv = (CachedValue)packet;
062            super.buildPacket(cv, dataIn);
063            cv.setValue(super.readObject(dataIn));
064            
065        }
066    
067    
068    }