//   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;

import java.io.Serializable;
import java.util.Collection;
import java.util.List;

/**
 * <p>
 * This class represents a complete task model. A task model within AutoQUEST is usually generated
 * based on user session. Therefore, the task model consists of the user sessions, the models
 * of the identified tasks, as well as further information about the tasks (e.g. their
 * occurrence count) for statistical processing.
 * </p>
 * 
 * @author 2012, Patrick Harms
 */
public interface ITaskModel extends Cloneable, Serializable {

    /**
     * <p>
     * returns the user sessions belonging to the model. The return value may be null in the case
     * no user sessions are associated the the tasks in the model.
     * </p>
     * 
     * @return as described
     */
    public List<IUserSession> getUserSessions();

    /**
     * <p>
     * returns the tasks belonging to the model. The return value must not be null. However,
     * it may be an empty list, if the model is an empty model.
     * </p>
     * 
     * @return as described
     */
    public Collection<ITask> getTasks();

    /**
     * <p>
     * returns additional info for the provided task. The method returns null, if the provided
     * task does not belong to the model.
     * </p>
     * 
     * @return as described
     */
    public ITaskInfo getTaskInfo(ITask task);

    /**
     * <p>
     * creates a deep clone of the model including all tasks and user sessions.
     * </p>
     * 
     * @return as described
     */
    public ITaskModel clone();
}