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.Method;
025    import java.lang.reflect.Type;
026    import java.util.Locale;
027    
028    import org.granite.messaging.amf.io.convert.Converter;
029    import org.granite.messaging.amf.io.convert.Converters;
030    import org.granite.util.TypeUtil;
031    
032    /**
033     * @author Franck WOLFF
034     */
035    public 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    }