001/**
002 *   GRANITE DATA SERVICES
003 *   Copyright (C) 2006-2014 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.seam21;
023
024import java.lang.reflect.Type;
025
026import org.granite.messaging.amf.io.convert.Converter;
027import org.granite.messaging.amf.io.convert.Converters;
028import org.granite.messaging.amf.io.convert.Reverter;
029import org.granite.util.TypeUtil;
030import org.jboss.seam.core.Expressions;
031import org.jboss.seam.core.Expressions.ValueExpression;
032
033/**
034 * @author William DRAI
035 */
036public class ValueExpressionConverter extends Converter implements Reverter {
037    
038    private Expressions expressions = new Expressions();
039
040    public ValueExpressionConverter(Converters converters) {
041        super(converters);
042    }
043
044    @Override
045    protected boolean internalCanConvert(Object value, Type targetType) {
046        Class<?> targetClass = TypeUtil.classOfType(targetType);
047        return (
048            targetClass != Object.class && targetClass.isAssignableFrom(ValueExpression.class) &&
049            (value instanceof String || value == null)
050        );
051    }
052
053    @Override
054    protected Object internalConvert(Object value, Type targetType) {
055        if (value == null)
056            return null;
057        return expressions.createValueExpression((String)value);
058    }
059
060    public boolean canRevert(Object value) {
061        return value instanceof ValueExpression<?>;
062    }
063
064    public Object revert(Object value) {
065        return ((ValueExpression<?>)value).getExpressionString();
066    }
067
068}