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/*
 * Copyright (C) 2016 The droitated DB Authors
 *
 * 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.droitateddb;

import org.droitateddb.schema.SchemaConstants;

import static org.droitateddb.Utilities.getStaticFieldValue;

/**
 * @author Falk Appel
 * @author Alexander Frank
 */
public class DroitatedDB {
    private static final Object MUTEX = new Object();
    private static String basePackage;

    private DroitatedDB() {
        //static only
    }

    static String getBasePackage() {
        synchronized (MUTEX) {
            if (basePackage == null || "".equals(basePackage)) {
                basePackage = readBasePackageFromFile();
            }
        }
        return basePackage;
    }

    private static String readBasePackageFromFile() {
        try {
            Class basePackageDefinition = Class.forName(SchemaConstants.BASE_PACKAGE_FILE_PACKAGE + "." + SchemaConstants.BASE_PACKAGE_FILE_NAME);
            return getStaticFieldValue(basePackageDefinition, SchemaConstants.BASE_PACKAGE_CONSTANT_NAME);
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }
}