/*
* Geotoolkit - An Open Source Java GIS Toolkit
* http://www.geotoolkit.org
*
* (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
* (C) 2009, Geomatys
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotoolkit.filter;
import java.io.Serializable;
import javax.xml.bind.annotation.XmlTransient;
import org.apache.sis.util.ObjectConverters;
import org.apache.sis.util.UnconvertibleObjectException;
import org.opengis.filter.expression.Expression;
/**
* Override evaluate(Object,Class) by using the converters system.
*
* @author Johann Sorel (Geomatys)
* @module
*/
@XmlTransient
public abstract class AbstractExpression implements Expression,Serializable {
/**
* {@inheritDoc }
* Use the converters utility class to convert the default result object
* to the wished class.
*/
@Override
public <T> T evaluate(final Object candidate, final Class<T> target) {
final Object value = evaluate(candidate);
if (target == null) {
return (T) value; // TODO - unsafe cast!!!!
}
try{
return ObjectConverters.convert(value, target);
}catch (UnconvertibleObjectException ex){
return null;
}
}
}