001/*
002 * Copyright 2012-2018 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.boot.system;
018
019/**
020 * Access to system properties.
021 *
022 * @author Phillip Webb
023 * @since 2.0.0
024 */
025public final class SystemProperties {
026
027        private SystemProperties() {
028        }
029
030        public static String get(String... properties) {
031                for (String property : properties) {
032                        try {
033                                String override = System.getProperty(property);
034                                override = (override != null) ? override : System.getenv(property);
035                                if (override != null) {
036                                        return override;
037                                }
038                        }
039                        catch (Throwable ex) {
040                                System.err.println(
041                                                "Could not resolve '" + property + "' as system property: " + ex);
042                        }
043                }
044                return null;
045        }
046
047}