/*
 * Copyright (c) 2019, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * 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.wso2.extension.siddhi.execution.geovelocity.internal.impl;

import org.wso2.extension.siddhi.execution.geovelocity.api.GeoVelocityDataResolver;

/**
 * A singleton class to initialize extension.
 */
public class GeoVelocityDataResolverHolder {

    private static GeoVelocityDataResolverHolder geoVelocityDataResolverHolder = new GeoVelocityDataResolverHolder();
    private GeoVelocityDataResolver geoVelocityDataResolver;

    private GeoVelocityDataResolverHolder() {
    }

    public static GeoVelocityDataResolverHolder getGeoVelocityResolverHolderInstance() {

        return geoVelocityDataResolverHolder;
    }

    public GeoVelocityDataResolver getGeoVelocityDataResolver(String geovelocityResolverImplClassName)
            throws ClassNotFoundException, IllegalAccessException, InstantiationException {

        if (geoVelocityDataResolver == null) {
            synchronized (this) {
                geoVelocityDataResolver = (GeoVelocityDataResolver) Class.forName
                        (geovelocityResolverImplClassName).newInstance();
            }
        }
        return geoVelocityDataResolver;
    }
}
