/*
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.amazon.utils;

public class EnvironmentVariableUtils {
    public static String getMandatoryEnv(String name) {

        if (isNullOrEmpty(System.getenv(name))) {

            throw new IllegalStateException(String.format("Missing environment variable: %s", name));
        }
        return System.getenv(name);
    }

    public static String getOptionalEnv(String name, String defaultValue) {
        if (isNullOrEmpty(System.getenv(name))) {
            return defaultValue;
        }
        return System.getenv(name);
    }

    private static boolean isNullOrEmpty(String value) {
        return value == null || value.isEmpty();
    }
}