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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  }