1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 */ 19 package org.apache.maven.properties.internal; 20 21 import java.util.Properties; 22 23 /** 24 * @since 3.2.3 25 */ 26 public class SystemProperties { 27 /** 28 * Thread-safe System.properties copy implementation. 29 */ 30 public static void addSystemProperties(Properties props) { 31 props.putAll(getSystemProperties()); 32 } 33 34 /** 35 * Returns a copy of {@link System#getProperties()} in a thread-safe manner. 36 * 37 * @return {@link System#getProperties()} obtained in a thread-safe manner. 38 */ 39 public static Properties getSystemProperties() { 40 return copyProperties(System.getProperties()); 41 } 42 43 /** 44 * Copies the given {@link Properties} object into a new {@link Properties} object, in a thread-safe manner. 45 * @param properties Properties to copy. 46 * @return Copy of the given properties. 47 */ 48 public static Properties copyProperties(Properties properties) { 49 final Properties copyProperties = new Properties(); 50 // guard against modification/removal of keys in the given properties (MNG-5670, MNG-6053, MNG-6105) 51 synchronized (properties) { 52 copyProperties.putAll(properties); 53 } 54 return copyProperties; 55 } 56 }