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.activemq.store.kahadb.disk.util;
018    
019    /**
020     * Convenience base class for Marshaller implementations which do not deepCopy and
021     * which use variable size encodings.
022     * 
023     * @author chirino
024     * @param <T>
025     */
026    abstract public class VariableMarshaller<T> implements Marshaller<T> {
027    
028        public int getFixedSize() {
029            return -1;
030        }
031    
032        public boolean isDeepCopySupported() {
033            return false;
034        }
035    
036        public T deepCopy(T source) {
037            throw new UnsupportedOperationException();
038        }
039    
040    }