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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  }