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.Exchange; 025 import org.apache.camel.Expression; 026 import org.apache.camel.Processor; 027 import org.apache.camel.util.ExpressionComparator; 028 import org.apache.camel.util.ExpressionListComparator; 029 030 /** 031 * An implementation of the <a href="http://activemq.apache.org/camel/resequencer.html">Resequencer</a> 032 * which can reorder messages within a batch. 033 * 034 * @version $Revision: 64127 $ 035 */ 036 public class Resequencer extends BatchProcessor { 037 public Resequencer(Processor processor, Expression expression) { 038 this(processor, createSet(expression)); 039 } 040 041 public Resequencer(Processor processor, List<Expression> expressions) { 042 this(processor, createSet(expressions)); 043 } 044 045 public Resequencer(Processor processor, Set<Exchange> collection) { 046 super(processor, collection); 047 } 048 049 @Override 050 public String toString() { 051 return "Resequencer[to: " + getProcessor() + "]"; 052 } 053 054 // Implementation methods 055 //------------------------------------------------------------------------- 056 057 protected static Set<Exchange> createSet(Expression<Exchange> expression) { 058 return createSet(new ExpressionComparator<Exchange>(expression)); 059 } 060 061 protected static Set<Exchange> createSet(List<Expression> expressions) { 062 if (expressions.size() == 1) { 063 return createSet(expressions.get(0)); 064 } 065 return createSet(new ExpressionListComparator(expressions)); 066 } 067 068 protected static Set<Exchange> createSet(Comparator<? super Exchange> comparator) { 069 return new TreeSet<Exchange>(comparator); 070 } 071 }