QTI_not.java

/**
* OLAT - Online Learning and Training<br>
* http://www.olat.org
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); <br>
* you may not use this file except in compliance with the License.<br>
* You may obtain a copy of the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing,<br>
* software distributed under the License is distributed on an "AS IS" BASIS, <br>
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
* See the License for the specific language governing permissions and <br>
* limitations under the License.
* <p>
* Copyright (c) since 2004 at Multimedia- & E-Learning Services (MELS),<br>
* University of Zurich, Switzerland.
* <hr>
* <a href="http://www.openolat.org">
* OpenOLAT - Online Learning and Training</a><br>
* This file has been modified by the OpenOLAT community. Changes are licensed
* under the Apache 2.0 license as the original file.
*/

package org.olat.ims.qti.process.elements;

import org.dom4j.Element;
import org.olat.ims.qti.container.ItemContext;
import org.olat.ims.qti.process.QTIHelper;

public class QTI_not implements BooleanEvaluable {

	/**
	 * not element
	 * ims qti 1.2
	 * <!ELEMENT not (and | or | not | unanswered | other | varequal | varlt | varlte | 
	 *    vargt | vargte | varsubset | varinside | varsubstring | durequal | durlt | durlte | durgt | durgte)>
	 * 
	 */
	public boolean eval(Element boolElement, ItemContext userContext, EvalContext ect) {
		// since the dom is validated against the dtd, we know the not element has exactly one child element.
		Element child = (Element) boolElement.elements().get(0);
		String name = child.getName();
		BooleanEvaluable bev = QTIHelper.getBooleanEvaluableInstance(name);
		boolean res = !bev.eval(child, userContext, ect); 
		return res;
	}
}