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.ArrayList; 020 import java.util.Arrays; 021 import java.util.Collection; 022 import java.util.HashMap; 023 import java.util.HashSet; 024 import java.util.Hashtable; 025 import java.util.Iterator; 026 import java.util.LinkedList; 027 import java.util.List; 028 import java.util.Map; 029 import java.util.Properties; 030 import java.util.Set; 031 032 import org.apache.camel.Converter; 033 034 /** 035 * Some core java.util Collection based 036 * <a href="http://camel.apache.org/type-converter.html">Type Converters</a> 037 * 038 * @version $Revision: 747062 $ 039 */ 040 @Converter 041 public final class CollectionConverter { 042 043 /** 044 * Utility classes should not have a public constructor. 045 */ 046 private CollectionConverter() { 047 } 048 049 /** 050 * Converts a collection to an array 051 */ 052 @Converter 053 public static Object[] toArray(Collection value) { 054 if (value == null) { 055 return null; 056 } 057 return value.toArray(); 058 } 059 060 /** 061 * Converts an array to a collection 062 */ 063 @Converter 064 public static List toList(Object[] array) { 065 return Arrays.asList(array); 066 } 067 068 /** 069 * Converts a collection to a List if it is not already 070 */ 071 @Converter 072 @SuppressWarnings("unchecked") 073 public static List toList(Collection collection) { 074 return new ArrayList(collection); 075 } 076 077 /** 078 * Converts an {@link Iterator} to a {@link ArrayList} 079 */ 080 @Converter 081 @SuppressWarnings("unchecked") 082 public static ArrayList toArrayList(Iterator it) { 083 ArrayList list = new ArrayList(); 084 while (it.hasNext()) { 085 list.add(it.next()); 086 } 087 return list; 088 } 089 090 @Converter 091 @SuppressWarnings("unchecked") 092 public static Set toSet(Object[] array) { 093 Set answer = new HashSet(); 094 answer.addAll(Arrays.asList(array)); 095 return answer; 096 } 097 098 @Converter 099 @SuppressWarnings("unchecked") 100 public static Set toSet(Collection collection) { 101 return new HashSet(collection); 102 } 103 104 @Converter 105 public static Set toSet(Map map) { 106 return map.entrySet(); 107 } 108 109 @Converter 110 @SuppressWarnings("unchecked") 111 public static Properties toProperties(Map map) { 112 Properties answer = new Properties(); 113 answer.putAll(map); 114 return answer; 115 } 116 117 @Converter 118 @SuppressWarnings("unchecked") 119 public static Hashtable toHashtable(Map map) { 120 return new Hashtable(map); 121 } 122 123 @Converter 124 @SuppressWarnings("unchecked") 125 public static HashMap toHashMap(Map map) { 126 return new HashMap(map); 127 } 128 129 /** 130 * Converts an {@link Iterable} into a {@link List} 131 */ 132 @Converter 133 @SuppressWarnings("unchecked") 134 public static List toList(Iterable iterable) { 135 if (iterable instanceof List) { 136 return (List) iterable; 137 } 138 List result = new LinkedList(); 139 for (Object value : iterable) { 140 result.add(value); 141 } 142 return result; 143 } 144 }