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 }