/*-
 * ============LICENSE_START=======================================================
 * ONAP - Logging
 * ================================================================================
 * Copyright (C) 2019 AT&T Intellectual Property. 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.logging.filter.base;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class PropertyUtil {
    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    public String getProperty(String property) {
        logger.info("Checking for system property [{}]", property);
        String propertyValue = System.getProperty(property);
        if (propertyValue == null || propertyValue.isEmpty()) {
            logger.info("System property was null or empty. Checking environment variable for: {}", property);
            propertyValue = System.getenv(property);
            if (propertyValue == null || propertyValue.isEmpty()) {
                logger.info("Environment variable: {} was null or empty. Returning value: {}", property,
                        Constants.DefaultValues.UNKNOWN);
                propertyValue = Constants.DefaultValues.UNKNOWN;
            }
        }
        return propertyValue;
    }
}