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.Method;
025import java.lang.reflect.Type;
026import java.util.Locale;
027
028import org.granite.messaging.amf.io.convert.Converter;
029import org.granite.messaging.amf.io.convert.Converters;
030import org.granite.util.TypeUtil;
031
032/**
033 * @author Franck WOLFF
034 */
035public class String2Enum extends Converter {
036
037    public String2Enum(Converters converters) {
038        super(converters);
039    }
040
041    @Override
042        protected boolean internalCanConvert(Object value, Type targetType) {
043        return Enum.class.isAssignableFrom(TypeUtil.classOfType(targetType)) && (value == null || value instanceof String || value instanceof Enum);
044    }
045
046    @Override
047        protected Object internalConvert(Object value, Type targetType) {
048        if (value == null)
049            return null;
050        Class<?> enumType = TypeUtil.classOfType(targetType);
051        String enumValue = value instanceof String ? (String)value : ((Enum<?>)value).name();
052        try {
053                Method m = enumType.getClass().getMethod("valueOf", enumType, String.class);
054                return m.invoke(enumType, enumValue);
055        }
056        catch (Exception e) {
057                throw new RuntimeException("Cound not convert " + value + " to enum of type " + targetType, e);
058        }
059    }
060
061        public boolean canRevert(Object value) {
062                return (value == null) || (value instanceof Locale);
063        }
064
065        public Object revert(Object value) {
066                if (value != null)
067                        value = value.toString();
068                return value;
069        }
070}