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.Array;
024 import java.lang.reflect.Type;
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.ArrayUtil;
031
032 /**
033 * @author Franck WOLFF
034 */
035 public class Collection2Array extends Converter {
036
037 public Collection2Array(Converters converters) {
038 super(converters);
039 }
040
041 @Override
042 protected boolean internalCanConvert(Object value, Type targetType) {
043 Type targetComponentType = ArrayUtil.getComponentType(targetType);
044
045 if (targetComponentType == null)
046 return false; // not an array.
047
048 if (value == null)
049 return true;
050
051 if (!(value instanceof Collection<?>))
052 return false;
053
054 if (targetComponentType.equals(Object.class))
055 return true;
056
057 Converter itemConverter = null;
058 for (Object item : (Collection<?>)value) {
059
060 if (itemConverter == null)
061 itemConverter = converters.getConverter(item, targetComponentType);
062 else if (!itemConverter.canConvert(item, targetComponentType))
063 itemConverter = converters.getConverter(item, targetComponentType);
064
065 if (itemConverter == null)
066 return false;
067 }
068
069 return true;
070 }
071
072 @Override
073 protected Object internalConvert(Object value, Type targetType) {
074
075 if (value == null)
076 return null;
077
078 if (value instanceof Collection<?>) {
079 Collection<?> c = (Collection<?>)value;
080
081 Type targetComponentType = ArrayUtil.getComponentType(targetType);
082 if (targetComponentType != null) {
083 Converter itemConverter = null;
084 final Object array = ArrayUtil.newArray(targetComponentType, c.size());
085 int i = 0;
086 for (Object item : c) {
087
088 if (itemConverter == null)
089 itemConverter = converters.getConverter(item, targetComponentType);
090 else if (!itemConverter.canConvert(item, targetComponentType))
091 itemConverter = converters.getConverter(item, targetComponentType);
092
093 if (itemConverter == null)
094 throw new IllegalConverterArgumentException(this, value, targetType);
095
096 Array.set(array, i++, itemConverter.convert(item, targetComponentType));
097 }
098 return array;
099 }
100 }
101
102 throw new IllegalConverterArgumentException(this, value, targetType);
103 }
104 }