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; 018 019 import java.util.Comparator; 020 import java.util.List; 021 import java.util.Set; 022 import java.util.TreeSet; 023 024 import org.apache.camel.Endpoint; 025 import org.apache.camel.Exchange; 026 import org.apache.camel.Expression; 027 import org.apache.camel.Processor; 028 import org.apache.camel.util.ExpressionComparator; 029 import org.apache.camel.util.ExpressionListComparator; 030 031 /** 032 * An implementation of the <a href="http://activemq.apache.org/camel/resequencer.html">Resequencer</a> 033 * which can reorder messages within a batch. 034 * 035 * @version $Revision: 35332 $ 036 */ 037 public class Resequencer extends BatchProcessor { 038 public Resequencer(Endpoint endpoint, Processor processor, Expression<Exchange> expression) { 039 this(endpoint, processor, createSet(expression)); 040 } 041 042 public Resequencer(Endpoint endpoint, Processor processor, List<Expression> expressions) { 043 this(endpoint, processor, createSet(expressions)); 044 } 045 046 public Resequencer(Endpoint endpoint, Processor processor, Set<Exchange> collection) { 047 super(endpoint, processor, collection); 048 } 049 050 @Override 051 public String toString() { 052 return "Resequencer[to: " + getProcessor() + "]"; 053 } 054 055 // Implementation methods 056 //------------------------------------------------------------------------- 057 058 protected static Set<Exchange> createSet(Expression<Exchange> expression) { 059 return createSet(new ExpressionComparator<Exchange>(expression)); 060 } 061 062 protected static Set<Exchange> createSet(List<Expression> expressions) { 063 if (expressions.size() == 1) { 064 return createSet(expressions.get(0)); 065 } 066 return createSet(new ExpressionListComparator(expressions)); 067 } 068 069 protected static Set<Exchange> createSet(Comparator<? super Exchange> comparator) { 070 return new TreeSet<Exchange>(comparator); 071 } 072 }