AggregationStrategyFactory.java

/**
 * *****************************************************************************
 * Copyright 2013 Johannes Mitlmeier
 *
 * 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.fub.agg2graph.agg;

import de.fub.agg2graph.agg.strategy.DefaultAggregationStrategy;

/**
 * A factory that returns the {@link IAggregationStrategy} currently set via the
 * getObject method.
 *
 * @author Johannes Mitlmeier
 *
 */
public class AggregationStrategyFactory {
    /*
     * Default class to return. Can be overwritten by calls to setClass.
     */

    private static Class<? extends IAggregationStrategy> factoryClass = DefaultAggregationStrategy.class;

    public static void setClass(Class<? extends IAggregationStrategy> clazz) {
        factoryClass = clazz;
    }

    public static IAggregationStrategy getObject() {
        if (factoryClass == null) {
            return null;
        }
        try {
            return factoryClass.newInstance();
        } catch (InstantiationException e) {
            e.printStackTrace();
            return null;
        } catch (IllegalAccessException e) {
            e.printStackTrace();
            return null;
        }
    }
}