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.camel.processor.resequencer;
018
019 import java.util.Comparator;
020
021 /**
022 * A strategy for comparing elements of a sequence.
023 *
024 * @author Martin Krasser
025 *
026 * @version $Revision: 697732 $
027 */
028 public interface SequenceElementComparator<E> extends Comparator<E> {
029
030 /**
031 * Returns <code>true</code> if <code>o1</code> is an immediate predecessor
032 * of <code>o2</code>.
033 *
034 * @param o1 a sequence element.
035 * @param o2 a sequence element.
036 */
037 boolean predecessor(E o1, E o2);
038
039 /**
040 * Returns <code>true</code> if <code>o1</code> is an immediate successor
041 * of <code>o2</code>.
042 *
043 * @param o1 a sequence element.
044 * @param o2 a sequence element.
045 */
046 boolean successor(E o1, E o2);
047
048 }