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.TypeUtil;
032import org.granite.util.CollectionUtil;
033
034/**
035 * @author Franck WOLFF
036 */
037public class Array2Collection extends Converter {
038
039    public Array2Collection(Converters converters) {
040        super(converters);
041    }
042
043    @Override
044        protected boolean internalCanConvert(Object value, Type targetType) {
045
046        Type targetComponentType = CollectionUtil.getComponentType(targetType);
047        if (targetComponentType == null)
048            return false; // not a collection.
049
050        if (value == null)
051            return true;
052
053        if (!value.getClass().isArray())
054            return false;
055
056        Class<?> oComponentClass = value.getClass().getComponentType();
057        if (targetComponentType.equals(oComponentClass))
058            return true;
059
060        Converter itemConverter = null;
061        final int length = Array.getLength(value);
062        for (int i = 0; i < length; i++) {
063            Object item = Array.get(value, i);
064
065            if (itemConverter == null)
066                itemConverter = converters.getConverter(item, targetComponentType);
067            else if (!itemConverter.canConvert(item, targetComponentType))
068                itemConverter = converters.getConverter(item, targetComponentType);
069
070            if (itemConverter == null)
071                return false;
072        }
073
074        return true;
075    }
076
077    @Override
078        protected Object internalConvert(Object value, Type targetType) {
079
080        if (value == null)
081            return null;
082
083        if (value.getClass().isArray()) {
084            Type targetComponentType = CollectionUtil.getComponentType(targetType);
085
086            if (targetComponentType != null) {
087                final int length = Array.getLength(value);
088                Class<?> targetClass = TypeUtil.classOfType(targetType);
089
090                Collection<Object> targetInstance = null;
091                try {
092                    targetInstance = CollectionUtil.newCollection(targetClass, Array.getLength(value));
093                } catch (Exception e) {
094                    throw new IllegalConverterArgumentException(this, value, targetType, e);
095                }
096
097                Converter itemConverter = null;
098                for (int i = 0; i < length; i++) {
099                    Object item = Array.get(value, i);
100
101                    if (itemConverter == null)
102                        itemConverter = converters.getConverter(item, targetComponentType);
103                    else if (!itemConverter.canConvert(item, targetComponentType))
104                        itemConverter = converters.getConverter(item, targetComponentType);
105
106                    if (itemConverter == null)
107                        throw new IllegalConverterArgumentException(this, value, targetType);
108
109                    targetInstance.add(itemConverter.convert(item, targetComponentType));
110                }
111
112                return targetInstance;
113            }
114        }
115
116        throw new IllegalConverterArgumentException(this, value, targetType);
117    }
118}