/*
 * Copyright Amazon.com, Inc. or its affiliates. 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.
 * A copy of the License is located at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * or in the "license" file accompanying this file. This file 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 software.aws.neptune.jdbc.utilities;

import org.slf4j.Logger;
import java.sql.SQLException;

public class CastHelper {
    /**
     * Generic unwrap function implementation.
     *
     * @param iface        Class Object passed in.
     * @param logger       Logger for errors.
     * @param callingClass Calling class of function (should be this).
     * @param <T>          Template type of iface.
     * @return Casted Object.
     * @throws SQLException Thrown if it cannot be casted.
     */
    public static <T> T unwrap(final Class<T> iface, final Logger logger, final Object callingClass)
            throws SQLException {
        if (iface.isAssignableFrom(callingClass.getClass())) {
            return iface.cast(callingClass);
        }

        throw SqlError.createSQLException(
                logger,
                SqlState.DATA_EXCEPTION,
                SqlError.CANNOT_UNWRAP,
                iface.toString());
    }

    /**
     * Generic isWrapperFor implementation.
     *
     * @param iface        Class Object passed in.
     * @param callingClass Calling class of function (should be this).
     * @return Whether or not it is assignable.
     */
    public static boolean isWrapperFor(final Class<?> iface, final Object callingClass) {
        return (null != iface) && iface.isAssignableFrom(callingClass.getClass());
    }
}