source: branches/autoquest-core-tasktrees-alignment/src/main/java/de/ugoe/cs/autoquest/tasktrees/manager/ComponentManager.java @ 1733

//   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.manager;

import de.ugoe.cs.autoquest.tasktrees.temporalrelation.TemporalRelationshipRuleManager;
import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskBuilder;
import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskFactory;
import de.ugoe.cs.autoquest.tasktrees.treeimpl.TaskBuilder;
import de.ugoe.cs.autoquest.tasktrees.treeimpl.TaskFactory;

/**
 * <p>
 * The component manager is the central reference for the distinct submodules
 * required for task tree generation. Such include the temporal relationship
 * rule manager, the task equality rule manager, the default task builder, as
 * well as the default task factory.
 * </p>
 * 
 * @version 1.0
 * @author pharms
 */
public class ComponentManager {

        /**
         * <p>
         * clears the singleton instance. Needed for test purposes to ensure
         * statelessness between tests.
         * </p>
         */
        public static synchronized void clearInstance() {
                instance = null;
        }

        /**
         * <p>
         * returns the default task builder
         * </p>
         * 
         * @return as described
         */
        public static ITaskBuilder getDefaultTaskBuilder() {
                return getInstance().taskBuilder;
        }

        /**
         * <p>
         * returns the default task factory
         * </p>
         * 
         * @return as described
         */
        public static ITaskFactory getDefaultTaskFactory() {
                return getInstance().taskFactory;
        }

        /**
         * <p>
         * returns the singleton instance of this class
         * </p>
         * 
         * @return as described
         */
        private static synchronized ComponentManager getInstance() {
                if (instance == null) {
                        instance = new ComponentManager();
                        instance.init();
                }
                return instance;
        }

        /**
         * <p>
         * returns the default temporal relationship rule manager
         * </p>
         * 
         * @return as described
         */
        public static TemporalRelationshipRuleManager getTemporalRelationshipRuleManager() {
                return getInstance().temporalRelationshipRuleManager;
        }

        /**
         * <p>
         * singleton instance of this class
         * </p>
         */
        private static ComponentManager instance;

        /**
         * <p>
         * the default temporal relationship rule manager
         * </p>
         */
        private TemporalRelationshipRuleManager temporalRelationshipRuleManager;

        /**
         * <p>
         * the default task builder
         * </p>
         */
        private ITaskBuilder taskBuilder;

        /**
         * <p>
         * the default task factory
         * </p>
         */
        private ITaskFactory taskFactory;

        /**
         * <p>
         * initialized the component manager with all it default components which
         * are the temporal relationship rule manager, the task equality rule
         * manager, the default task builder, as well as the default task factory.
         * </p>
         */
        private void init() {
                taskBuilder = new TaskBuilder();
                taskFactory = new TaskFactory();

                temporalRelationshipRuleManager = new TemporalRelationshipRuleManager(
                                taskFactory, taskBuilder);
                temporalRelationshipRuleManager.init();
        }

}