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    }