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
021package org.granite.messaging.amf.io.convert.impl;
022
023import java.lang.reflect.Method;
024import java.lang.reflect.Type;
025import java.util.Locale;
026
027import org.granite.messaging.amf.io.convert.Converter;
028import org.granite.messaging.amf.io.convert.Converters;
029import org.granite.util.TypeUtil;
030
031/**
032 * @author Franck WOLFF
033 */
034public 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}