DataPointComparatorFactory.java

/*******************************************************************************
 * Copyright 2011 The Regents of the University of California
 * 
 * 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 org.ohmage.conditionevaluator.comparator;

import org.ohmage.conditionevaluator.DataPoint;

/**
 * Creates a DataPointComparator based on the prompt type. The possible prompt
 * types are defined in the DataPoint.PromptType enum. Each prompt type must
 * have a comparator defined by extending the AbstractDataPointComparator class.
 * 
 * @author mmonibi
 */
public final class DataPointComparatorFactory {
    private DataPointComparatorFactory() {
    };

    /**
     * Create one of six comparators based on the prompt type.
     * 
     * @param promptType One of the prompt types defined by the
     *            DataPoint.PromptType enum
     * @return The appropriate DataPointComparator
     */
    public static DataPointComparator createDataPointComparator(DataPoint.PromptType promptType) {

        switch (promptType) {
            case single_choice:
                return new SingleChoiceDataPointComparator();

            case single_choice_custom:
                return new SingleChoiceCustomDataPointComparator();

            case multi_choice:
                return new MultiChoiceDataPointComparator();

            case multi_choice_custom:
                return new MultiChoiceCustomDataPointComparator();

            case number:
                return new NumberDataPointComparator();

            case hours_before_now:
                return new HoursBeforeNowDataPointComparator();

            default:
                return new BasicDataPointComparator();
        }

    }
}