001 /**
002 * GRANITE DATA SERVICES
003 * Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 * This file is part of the Granite Data Services Platform.
006 *
007 * Granite Data Services is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * Granite Data Services is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 * General Public License for more details.
016 *
017 * You should have received a copy of the GNU Lesser General Public
018 * License along with this library; if not, write to the Free Software
019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 * USA, or see <http://www.gnu.org/licenses/>.
021 */
022 package org.granite.messaging.amf.io.convert.impl;
023
024 import java.lang.reflect.Type;
025 import java.lang.reflect.WildcardType;
026 import java.util.Map;
027 import java.util.Map.Entry;
028
029 import org.granite.messaging.amf.io.convert.Converter;
030 import org.granite.messaging.amf.io.convert.Converters;
031 import org.granite.messaging.amf.io.convert.IllegalConverterArgumentException;
032 import org.granite.util.TypeUtil;
033 import org.granite.util.MapUtil;
034
035 /**
036 * @author Franck WOLFF
037 */
038 public class Map2Map extends Converter {
039
040 public Map2Map(Converters converters) {
041 super(converters);
042 }
043
044 @Override
045 protected boolean internalCanConvert(Object value, Type targetType) {
046
047 Type[] targetComponentTypes = MapUtil.getComponentTypes(targetType);
048 if (targetComponentTypes == null)
049 return false; // not a map.
050
051 if (value == null)
052 return true;
053
054 if (!(value instanceof Map<?, ?>))
055 return false;
056
057 Type keyType = targetComponentTypes[0];
058 Type valueType = targetComponentTypes[1];
059
060 if ((keyType.equals(Object.class) || keyType instanceof WildcardType) &&
061 (valueType.equals(Object.class) || valueType instanceof WildcardType))
062 return true;
063
064 Converter keyConverter = null;
065 Converter valueConverter = null;
066 for (Map.Entry<?, ?> item : ((Map<?, ?>)value).entrySet()) {
067
068 if (keyConverter == null)
069 keyConverter = converters.getConverter(item.getKey(), keyType);
070 else if (!keyConverter.canConvert(item.getKey(), keyType))
071 keyConverter = converters.getConverter(item.getKey(), keyType);
072 if (keyConverter == null)
073 return false;
074
075 if (valueConverter == null)
076 valueConverter = converters.getConverter(item.getValue(), valueType);
077 else if (!valueConverter.canConvert(item.getValue(), valueType))
078 valueConverter = converters.getConverter(item.getValue(), valueType);
079 if (valueConverter == null)
080 return false;
081 }
082
083 return true;
084 }
085
086 @Override
087 protected Object internalConvert(Object value, Type targetType) {
088
089 if (value == null)
090 return null;
091
092 if (value instanceof Map<?, ?>) {
093 Map<?, ?> map = (Map<?, ?>)value;
094
095 Type[] targetComponentTypes = MapUtil.getComponentTypes(targetType);
096 if (targetComponentTypes != null) {
097 Type keyType = targetComponentTypes[0];
098 Type valueType = targetComponentTypes[1];
099
100 Class<?> targetClass = TypeUtil.classOfType(targetType);
101 if (targetClass.isInstance(value) &&
102 (keyType.equals(Object.class) || keyType instanceof WildcardType) &&
103 (valueType.equals(Object.class) || valueType instanceof WildcardType))
104 return value;
105
106 // Check if all keys and values are compatible
107 if (targetClass.isInstance(value)) {
108 Class<?> keyClass = TypeUtil.classOfType(keyType);
109 Class<?> valueClass = TypeUtil.classOfType(valueType);
110
111 boolean compatible = true;
112 for (Entry<?, ?> entry : ((Map<?, ?>)value).entrySet()) {
113 if (!keyClass.isInstance(entry.getKey()) || !valueClass.isInstance(entry.getValue())) {
114 compatible = false;
115 break;
116 }
117 }
118 if (compatible)
119 return value;
120 }
121
122 Map<Object, Object> targetInstance = null;
123 try {
124 targetInstance = MapUtil.newMap(targetClass, map.size());
125 } catch (Exception e) {
126 throw new IllegalConverterArgumentException(this, value, targetType, e);
127 }
128
129 Converter keyConverter = null;
130 Converter valueConverter = null;
131 for (Map.Entry<?, ?> item : ((Map<?, ?>)value).entrySet()) {
132
133 if (keyConverter == null)
134 keyConverter = converters.getConverter(item.getKey(), keyType);
135 else if (!keyConverter.canConvert(item.getKey(), keyType))
136 keyConverter = converters.getConverter(item.getKey(), keyType);
137 if (keyConverter == null)
138 throw new IllegalConverterArgumentException(this, value, targetType);
139
140 if (valueConverter == null)
141 valueConverter = converters.getConverter(item.getValue(), valueType);
142 else if (!valueConverter.canConvert(item.getValue(), valueType))
143 valueConverter = converters.getConverter(item.getValue(), valueType);
144 if (valueConverter == null)
145 throw new IllegalConverterArgumentException(this, value, targetType);
146
147 targetInstance.put(
148 keyConverter.convert(item.getKey(), keyType),
149 valueConverter.convert(item.getValue(), valueType)
150 );
151 }
152
153 return targetInstance;
154 }
155 }
156
157 throw new IllegalConverterArgumentException(this, value, targetType);
158 }
159 }