/*
* Copyright (c) 2005-2011 Vincent Vandenschrick. All rights reserved.
*
* This file is part of the Jspresso framework.
*
* Jspresso 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, either version 3 of the License, or
* (at your option) any later version.
*
* Jspresso 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.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Jspresso. If not, see <http://www.gnu.org/licenses/>.
*/
package org.jspresso.framework.util.freemarker;
import java.util.List;
import freemarker.ext.beans.BeansWrapper;
import freemarker.ext.beans.BooleanModel;
import freemarker.template.AdapterTemplateModel;
import freemarker.template.TemplateMethodModelEx;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
import freemarker.template.TemplateScalarModel;
/**
* Tells wether an object is instance of a class.
*
* @version $LastChangedRevision: 4321 $
* @author Vincent Vandenschrick
*/
public class InstanceOf implements TemplateMethodModelEx {
private BeansWrapper wrapper;
/**
* Constructs a new <code>InstanceOf</code> instance.
*
* @param wrapper
* the beans wrapper.
*/
public InstanceOf(BeansWrapper wrapper) {
this.wrapper = wrapper;
}
/**
* Tells wether an object is instance of a class.
* <p>
* {@inheritDoc}
*/
@Override
public TemplateModel exec(@SuppressWarnings("rawtypes") List arguments)
throws TemplateModelException {
try {
Object target = ((AdapterTemplateModel) arguments.get(0))
.getAdaptedObject(Object.class);
Class<?> clazz = Class.forName(((TemplateScalarModel) arguments.get(1))
.getAsString());
return new BooleanModel(new Boolean(clazz.isAssignableFrom(target
.getClass())), wrapper);
} catch (Exception ex) {
throw new TemplateModelException("Could execute instanceof method.", ex);
}
}
}