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 org.apache.camel.TypeConverter;
020    
021    import java.lang.reflect.Array;
022    import java.util.ArrayList;
023    import java.util.Arrays;
024    import java.util.Collection;
025    import java.util.List;
026    
027    /**
028     * A type converter which is used to convert to and from array types particularly for derived types of array
029     * component types and dealing with primitive array types.
030     *
031     * @version $Revision: $
032     */
033    public class ArrayTypeConverter implements TypeConverter {
034        public <T> T convertTo(Class<T> type, Object value) {
035            if (type.isArray()) {
036                if (value instanceof Collection) {
037                    Collection collection = (Collection) value;
038                    Object array = Array.newInstance(type.getComponentType(), collection.size());
039                    if (array instanceof Object[]) {
040                        collection.toArray((Object[]) array);
041                    }
042                    else {
043                        int index = 0;
044                        for (Object element : collection) {
045                            Array.set(array, index++, element);
046                        }
047                    }
048                    return (T) array;
049                }
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            }
059            else if (Collection.class.isAssignableFrom(type)) {
060                if (value != null) {
061                    if (value instanceof Object[]) {
062                        return (T) Arrays.asList((Object[]) value);
063                    }
064                    else if (value.getClass().isArray()) {
065                        int size = Array.getLength(value);
066                        List answer = new ArrayList(size);
067                        for (int i = 0; i < size; i++) {
068                            answer.add(Array.get(value, i));
069                        }
070                        return (T) answer;
071                    }
072                }
073            }
074            return null;
075        }
076    }