1 package org.apache.maven.properties.internal;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.util.Properties;
23
24 /**
25 * @since 3.2.3
26 */
27 public class SystemProperties
28 {
29 /**
30 * Thread-safe System.properties copy implementation.
31 */
32 public static void addSystemProperties( Properties props )
33 {
34 props.putAll( getSystemProperties() );
35 }
36
37 /**
38 * Returns a copy of {@link System#getProperties()} in a thread-safe manner.
39 *
40 * @return {@link System#getProperties()} obtained in a thread-safe manner.
41 */
42 public static Properties getSystemProperties()
43 {
44 return copyProperties( System.getProperties() );
45 }
46
47 /**
48 * Copies the given {@link Properties} object into a new {@link Properties} object, in a thread-safe manner.
49 * @param properties Properties to copy.
50 * @return Copy of the given properties.
51 */
52 public static Properties copyProperties( Properties properties )
53 {
54 final Properties copyProperties = new Properties();
55 // guard against modification/removal of keys in the given properties (MNG-5670, MNG-6053, MNG-6105)
56 synchronized ( properties )
57 {
58 copyProperties.putAll( properties );
59 }
60 return copyProperties;
61 }
62
63 }