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