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.Exchange;
026    import org.apache.camel.support.TypeConverterSupport;
027    
028    /**
029     * A type converter which is used to convert to and from array types
030     * particularly for derived types of array component types and dealing with
031     * primitive array types.
032     *
033     * @version 
034     */
035    public class ArrayTypeConverter extends TypeConverterSupport {
036    
037        @SuppressWarnings("unchecked")
038        public <T> T convertTo(Class<T> type, Exchange exchange, Object value) {
039            if (type.isArray()) {
040                if (value instanceof Collection) {
041                    Collection<?> collection = (Collection<?>)value;
042                    Object array = Array.newInstance(type.getComponentType(), collection.size());
043                    if (array instanceof Object[]) {
044                        collection.toArray((Object[])array);
045                    } else {
046                        int index = 0;
047                        for (Object element : collection) {
048                            Array.set(array, index++, element);
049                        }
050                    }
051                    return (T)array;
052                } else if (value != null && value.getClass().isArray()) {
053                    int size = Array.getLength(value);
054                    Object answer = Array.newInstance(type.getComponentType(), size);
055                    for (int i = 0; i < size; i++) {
056                        Array.set(answer, i, Array.get(value, i));
057                    }
058                    return (T)answer;
059                }
060            } else if (Collection.class.isAssignableFrom(type)) {
061                if (value != null) {
062                    if (value instanceof Object[]) {
063                        return (T)Arrays.asList((Object[])value);
064                    } else if (value.getClass().isArray()) {
065                        int size = Array.getLength(value);
066                        List<Object> answer = new ArrayList<Object>(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    
077    }