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.converter;
018
019 import java.util.Arrays;
020 import java.util.Collection;
021 import java.util.HashSet;
022 import java.util.List;
023 import java.util.Map;
024 import java.util.Set;
025
026 import org.apache.camel.Converter;
027
028 /**
029 * Some core java.util Collection based
030 * <a href="http://activemq.apache.org/camel/type-converter.html">Type Converters</a>
031 *
032 * @version $Revision: 524215 $
033 */
034 @Converter
035 public class CollectionConverter {
036
037 /**
038 * Utility classes should not have a public constructor.
039 */
040 private CollectionConverter() {
041 }
042
043 /**
044 * Converts a collection to an array
045 */
046 @Converter
047 public static Object[] toArray(Collection value) {
048 if (value == null) {
049 return null;
050 }
051 return value.toArray();
052 }
053
054 /**
055 * Converts an array to a collection
056 */
057 @Converter
058 public static List toList(Object[] array) {
059 return Arrays.asList(array);
060 }
061
062 @Converter
063 public static Set toSet(Object[] array) {
064 Set answer = new HashSet();
065 for (Object element : array) {
066 answer.add(element);
067 }
068 return answer;
069 }
070
071 @Converter
072 public static Set toSet(Collection collection) {
073 return new HashSet(collection);
074 }
075
076 @Converter
077 public static Set toSet(Map map) {
078 return map.entrySet();
079 }
080 }