source: branches/autoquest-core-tasktrees-alignment/src/main/java/de/ugoe/cs/autoquest/tasktrees/treeimpl/Optional.java @ 1734

//   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.treeimpl;

import de.ugoe.cs.autoquest.tasktrees.treeifc.IOptional;
import de.ugoe.cs.autoquest.tasktrees.treeifc.ITask;

// TODO: Auto-generated Javadoc
/**
 * <p>
 * this is the default implementation of the interface {@link IOptional}. It
 * does not do anything fancy except implementing the interface.
 * </p>
 *
 * @author Patrick Harms
 */
class Optional extends MarkingTemporalRelationship implements IOptional {

        /** <p> default serial version UID </p>. */
        private static final long serialVersionUID = 1L;

        /**
         * <p>
         * simple constructor providing the base class with a human readable name of
         * the type of this task
         * </p>.
         */
        Optional() {
                super("optionality");
        }

        /*
         * (non-Javadoc)
         * 
         * @see
         * de.ugoe.cs.autoquest.tasktrees.treeimpl.MarkingTemporalRelationship#clone
         * ()
         */
        @Override
        public Optional clone() {
                return (Optional) super.clone();
        }

        /*
         * (non-Javadoc)
         * 
         * @see de.ugoe.cs.autoquest.tasktrees.treeimpl.MarkingTemporalRelationship#
         * setMarkedTask(ITask)
         */
        @Override
        protected void setMarkedTask(ITask markedTask) {
                if (markedTask instanceof IOptional) {
                        throw new IllegalArgumentException(
                                        "the marked task of an optional must not be an optional");
                }

                super.setMarkedTask(markedTask);
        }

}