001 /*
002 GRANITE DATA SERVICES
003 Copyright (C) 2011 GRANITE DATA SERVICES S.A.S.
004
005 This file is part of Granite Data Services.
006
007 Granite Data Services is free software; you can redistribute it and/or modify
008 it under the terms of the GNU Library General Public License as published by
009 the Free Software Foundation; either version 2 of the License, or (at your
010 option) any later version.
011
012 Granite Data Services is distributed in the hope that it will be useful, but
013 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
015 for more details.
016
017 You should have received a copy of the GNU Library General Public License
018 along with this library; if not, see <http://www.gnu.org/licenses/>.
019 */
020
021 package org.granite.messaging.amf.io.convert.impl;
022
023 import java.lang.reflect.Type;
024 import java.lang.reflect.WildcardType;
025 import java.util.Collection;
026
027 import org.granite.messaging.amf.io.convert.Converter;
028 import org.granite.messaging.amf.io.convert.Converters;
029 import org.granite.messaging.amf.io.convert.IllegalConverterArgumentException;
030 import org.granite.util.ClassUtil;
031 import org.granite.util.CollectionUtil;
032
033 /**
034 * @author Franck WOLFF
035 */
036 public class Collection2Collection extends Converter {
037
038 public Collection2Collection(Converters converters) {
039 super(converters);
040 }
041
042 @Override
043 protected boolean internalCanConvert(Object value, Type targetType) {
044
045 Type targetComponentType = CollectionUtil.getComponentType(targetType);
046 if (targetComponentType == null)
047 return false; // not a collection.
048
049 if (value == null)
050 return true;
051
052 if (!(value instanceof Collection<?>))
053 return false;
054
055 if (targetComponentType.equals(Object.class) || targetComponentType instanceof WildcardType)
056 return true;
057
058 Converter itemConverter = null;
059 for (Object item : (Collection<?>)value) {
060
061 if (itemConverter == null)
062 itemConverter = converters.getConverter(item, targetComponentType);
063 else if (!itemConverter.canConvert(item, targetComponentType))
064 itemConverter = converters.getConverter(item, targetComponentType);
065
066 if (itemConverter == null)
067 return false;
068 }
069
070 return true;
071 }
072
073 @Override
074 protected Object internalConvert(Object value, Type targetType) {
075
076 if (value == null)
077 return null;
078
079 if (value instanceof Collection<?>) {
080 Collection<?> c = (Collection<?>)value;
081
082 Type targetComponentType = CollectionUtil.getComponentType(targetType);
083 if (targetComponentType != null) {
084
085 Class<?> targetClass = ClassUtil.classOfType(targetType);
086 if (targetClass.isInstance(value) &&
087 (targetComponentType.equals(Object.class) || targetComponentType instanceof WildcardType))
088 return value;
089
090 Collection<Object> targetInstance = null;
091 try {
092 targetInstance = CollectionUtil.newCollection(targetClass, c.size());
093 } catch (Exception e) {
094 throw new IllegalConverterArgumentException(this, value, targetType, e);
095 }
096
097 Converter itemConverter = null;
098 for (Object item : c) {
099
100 if (itemConverter == null)
101 itemConverter = converters.getConverter(item, targetComponentType);
102 else if (!itemConverter.canConvert(item, targetComponentType))
103 itemConverter = converters.getConverter(item, targetComponentType);
104
105 if (itemConverter == null)
106 throw new IllegalConverterArgumentException(this, value, targetType);
107
108 targetInstance.add(itemConverter.convert(item, targetComponentType));
109 }
110
111 return targetInstance;
112 }
113 }
114
115 throw new IllegalConverterArgumentException(this, value, targetType);
116 }
117 }