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 */
022package org.granite.messaging.amf.io.convert.impl;
023
024import java.lang.reflect.Array;
025import java.lang.reflect.Type;
026import java.util.Collection;
027
028import org.granite.messaging.amf.io.convert.Converter;
029import org.granite.messaging.amf.io.convert.Converters;
030import org.granite.messaging.amf.io.convert.IllegalConverterArgumentException;
031import org.granite.util.ArrayUtil;
032
033/**
034 * @author Franck WOLFF
035 */
036public class Collection2Array extends Converter {
037
038    public Collection2Array(Converters converters) {
039        super(converters);
040    }
041
042    @Override
043        protected boolean internalCanConvert(Object value, Type targetType) {
044        Type targetComponentType = ArrayUtil.getComponentType(targetType);
045
046        if (targetComponentType == null)
047            return false; // not an array.
048
049        if (value == null)
050            return true;
051
052        if (!(value instanceof Collection<?>))
053            return false;
054
055        if (targetComponentType.equals(Object.class))
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 = ArrayUtil.getComponentType(targetType);
083            if (targetComponentType != null) {
084                Converter itemConverter = null;
085                final Object array = ArrayUtil.newArray(targetComponentType, c.size());
086                int i = 0;
087                for (Object item : c) {
088
089                    if (itemConverter == null)
090                        itemConverter = converters.getConverter(item, targetComponentType);
091                    else if (!itemConverter.canConvert(item, targetComponentType))
092                        itemConverter = converters.getConverter(item, targetComponentType);
093
094                    if (itemConverter == null)
095                        throw new IllegalConverterArgumentException(this, value, targetType);
096
097                    Array.set(array, i++, itemConverter.convert(item, targetComponentType));
098                }
099                return array;
100            }
101        }
102
103        throw new IllegalConverterArgumentException(this, value, targetType);
104    }
105}