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.processor; 018 019import java.util.Comparator; 020import java.util.List; 021 022import org.apache.camel.AsyncCallback; 023import org.apache.camel.AsyncProcessor; 024import org.apache.camel.Exchange; 025import org.apache.camel.Expression; 026import org.apache.camel.Message; 027import org.apache.camel.spi.IdAware; 028import org.apache.camel.support.ServiceSupport; 029import org.apache.camel.util.AsyncProcessorHelper; 030 031/** 032 * A processor that sorts the expression using a comparator 033 */ 034public class SortProcessor<T> extends ServiceSupport implements AsyncProcessor, Traceable, IdAware { 035 036 private String id; 037 private final Expression expression; 038 private final Comparator<? super T> comparator; 039 040 public SortProcessor(Expression expression, Comparator<? super T> comparator) { 041 this.expression = expression; 042 this.comparator = comparator; 043 } 044 045 public void process(Exchange exchange) throws Exception { 046 AsyncProcessorHelper.process(this, exchange); 047 } 048 049 @Override 050 public boolean process(Exchange exchange, AsyncCallback callback) { 051 try { 052 Message in = exchange.getIn(); 053 054 @SuppressWarnings("unchecked") 055 List<T> list = expression.evaluate(exchange, List.class); 056 list.sort(comparator); 057 058 if (exchange.getPattern().isOutCapable()) { 059 Message out = exchange.getOut(); 060 out.copyFrom(in); 061 out.setBody(list); 062 } else { 063 in.setBody(list); 064 } 065 } catch (Exception e) { 066 exchange.setException(e); 067 } 068 069 callback.done(true); 070 return true; 071 } 072 073 public String toString() { 074 return "Sort[" + expression + "]"; 075 } 076 077 @Override 078 public String getTraceLabel() { 079 return "sort[" + expression + "]"; 080 } 081 082 public String getId() { 083 return id; 084 } 085 086 public void setId(String id) { 087 this.id = id; 088 } 089 090 public Expression getExpression() { 091 return expression; 092 } 093 094 public Comparator<? super T> getComparator() { 095 return comparator; 096 } 097 098 @Override 099 protected void doStart() throws Exception { 100 // noop 101 } 102 103 @Override 104 protected void doStop() throws Exception { 105 // noop 106 } 107} 108 109