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
028 /**
029 * A processor that sorts the expression using a comparator
030 */
031 public class SortProcessor implements Processor {
032
033 private final Expression expression;
034 private final Comparator comparator;
035
036 public SortProcessor(Expression expression, Comparator comparator) {
037 this.expression = expression;
038 this.comparator = comparator;
039 }
040
041 @SuppressWarnings("unchecked")
042 public void process(Exchange exchange) throws Exception {
043 Message in = exchange.getIn();
044
045 List list = expression.evaluate(exchange, List.class);
046 Collections.sort(list, comparator);
047
048 if (exchange.getPattern().isOutCapable()) {
049 Message out = exchange.getOut();
050 out.copyFrom(in);
051 out.setBody(list);
052 } else {
053 in.setBody(list);
054 }
055 }
056
057 }
058
059