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.impl.converter;
018
019 import java.lang.reflect.Array;
020 import java.util.ArrayList;
021 import java.util.Arrays;
022 import java.util.Collection;
023 import java.util.List;
024
025 import org.apache.camel.TypeConverter;
026
027 /**
028 * A type converter which is used to convert to and from array types
029 * particularly for derived types of array component types and dealing with
030 * primitive array types.
031 *
032 * @version $Revision: 660275 $
033 */
034 public class ArrayTypeConverter implements TypeConverter {
035
036 public <T> T convertTo(Class<T> type, Object value) {
037 if (type.isArray()) {
038 if (value instanceof Collection) {
039 Collection collection = (Collection)value;
040 Object array = Array.newInstance(type.getComponentType(), collection.size());
041 if (array instanceof Object[]) {
042 collection.toArray((Object[])array);
043 } else {
044 int index = 0;
045 for (Object element : collection) {
046 Array.set(array, index++, element);
047 }
048 }
049 return (T)array;
050 } else if (value != null && value.getClass().isArray()) {
051 int size = Array.getLength(value);
052 Object answer = Array.newInstance(type.getComponentType(), size);
053 for (int i = 0; i < size; i++) {
054 Array.set(answer, i, Array.get(value, i));
055 }
056 return (T)answer;
057 }
058 } else if (Collection.class.isAssignableFrom(type)) {
059 if (value != null) {
060 if (value instanceof Object[]) {
061 return (T)Arrays.asList((Object[])value);
062 } else if (value.getClass().isArray()) {
063 int size = Array.getLength(value);
064 List answer = new ArrayList(size);
065 for (int i = 0; i < size; i++) {
066 answer.add(Array.get(value, i));
067 }
068 return (T)answer;
069 }
070 }
071 }
072 return null;
073 }
074 }