/**
* 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.
* <p>
*/
package org.olat.course.condition.interpreter;
import org.olat.course.editor.CourseEditorEnv;
import org.olat.course.run.userview.UserCourseEnvironment;
import com.neemsoft.jmep.FunctionCB;
/**
* Initial Date: Feb 6, 2004
* Description:<br>
* the abstract class for all functions
*
* @author Felix Jost
*/
public abstract class AbstractFunction extends FunctionCB{
private UserCourseEnvironment userCourseEnv;
/**
* @param userCourseEnv
*/
public AbstractFunction(UserCourseEnvironment userCourseEnv) {
this.userCourseEnv = userCourseEnv;
}
/**
* @see com.neemsoft.jmep.FunctionCB#call(java.lang.Object[])
*/
public abstract Object call(Object[] inStack);
/**
* @return user course environment
*/
public UserCourseEnvironment getUserCourseEnv() {
return userCourseEnv;
}
/**
* the exception handle method for each function. It checks the condition
* interpreters mode, e.g. if it is used in the editor environment or in the
* run.
*
* @param e
* @return default value of function
*/
protected Object handleException(Exception e){
CourseEditorEnv cev = getUserCourseEnv().getCourseEditorEnv();
if (cev != null) {
cev.pushError(e);
}
return defaultValue();
}
protected abstract Object defaultValue();
}