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 }