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.Collections; 020 import java.util.Comparator; 021 import java.util.List; 022 023 import org.apache.camel.Exchange; 024 import org.apache.camel.Expression; 025 import org.apache.camel.Message; 026 import org.apache.camel.Processor; 027 import org.apache.camel.support.ServiceSupport; 028 029 /** 030 * A processor that sorts the expression using a comparator 031 */ 032 public class SortProcessor<T> extends ServiceSupport implements Processor { 033 034 private final Expression expression; 035 private final Comparator<? super T> comparator; 036 037 public SortProcessor(Expression expression, Comparator<? super T> comparator) { 038 this.expression = expression; 039 this.comparator = comparator; 040 } 041 042 public void process(Exchange exchange) throws Exception { 043 Message in = exchange.getIn(); 044 045 @SuppressWarnings("unchecked") 046 List<T> list = expression.evaluate(exchange, List.class); 047 Collections.sort(list, comparator); 048 049 if (exchange.getPattern().isOutCapable()) { 050 Message out = exchange.getOut(); 051 out.copyFrom(in); 052 out.setBody(list); 053 } else { 054 in.setBody(list); 055 } 056 } 057 058 public String toString() { 059 return "Sort[" + expression + "]"; 060 } 061 062 @Override 063 protected void doStart() throws Exception { 064 // noop 065 } 066 067 @Override 068 protected void doStop() throws Exception { 069 // noop 070 } 071 } 072 073