//   Copyright 2012 Georg-August-Universität Göttingen, Germany
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

package de.ugoe.cs.autoquest.tasktrees.treeifc;


/**
 * <p>
 * This is an implementation of the visitor pattern. Through this, it is possible to effectively
 * process a task instance tree. 
 * </p>
 * 
 * @author Patrick Harms
 */
public interface ITaskInstanceVisitor {

    /**
     * <p>
     * method called for each visited event task instance.
     * </p>
     * 
     * @param eventTaskInstance the event task instance to be processed
     */
    public void visit(IEventTaskInstance eventTaskInstance);
    
    /**
     * <p>
     * method called for each visited iteration instance.
     * </p>
     * 
     * @param iterationInstance the iteration instance to be processed
     */
    public void visit(IIterationInstance iterationInstance);
    
    /**
     * <p>
     * method called for each visited optional instance.
     * </p>
     * 
     * @param optionalInstance the optional instance to be processed
     */
    public void visit(IOptionalInstance optionalInstance);
    
    /**
     * <p>
     * method called for each visited selection instance.
     * </p>
     * 
     * @param selectionInstance the selection instance to be processed
     */
    public void visit(ISelectionInstance selectionInstance);
    
    /**
     * <p>
     * method called for each visited sequence instance.
     * </p>
     * 
     * @param sequenceInstance the sequence instance to be processed
     */
    public void visit(ISequenceInstance sequenceInstance);

    /**
     * <p>
     * method called for each other kind of visited task instance (implemented to support future
     * versions).
     * </p>
     * 
     * @param taskInstance the task instance to be processed
     */
    public void visit(ITaskInstance taskInstance);
    
}