001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  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    package org.apache.kahadb.util;
018    
019    import java.io.DataInput;
020    import java.io.DataOutput;
021    import java.io.IOException;
022    
023    /**
024     * Implementation of a Marshaller for a Integer
025     * 
026     * @version $Revision: 816280 $
027     */
028    public class IntegerMarshaller implements Marshaller<Integer> {
029        
030        public static final IntegerMarshaller INSTANCE = new IntegerMarshaller();
031        
032        public void writePayload(Integer object, DataOutput dataOut) throws IOException {
033            dataOut.writeInt(object);
034        }
035    
036        public Integer readPayload(DataInput dataIn) throws IOException {
037            return dataIn.readInt();
038        }
039    
040        public int getFixedSize() {
041            return 4;
042        }
043    
044        
045        /** 
046         * @return the source object since integers are immutable. 
047         */
048        public Integer deepCopy(Integer source) {
049            return source;
050        }
051    
052        public boolean isDeepCopySupported() {
053            return true;
054        }
055    }