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 */ 017package org.apache.camel.util; 018 019import java.util.Comparator; 020 021import org.apache.camel.Exchange; 022import org.apache.camel.Expression; 023 024/** 025 * An implementation of {@link Comparator} that takes an {@link Expression} which is evaluated 026 * on each exchange to be compared 027 * 028 * @version 029 */ 030public class ExpressionComparator implements Comparator<Exchange> { 031 private final Expression expression; 032 033 public ExpressionComparator(Expression expression) { 034 this.expression = expression; 035 } 036 037 public int compare(Exchange e1, Exchange e2) { 038 Object o1 = expression.evaluate(e1, Object.class); 039 Object o2 = expression.evaluate(e2, Object.class); 040 return ObjectHelper.compare(o1, o2); 041 } 042}