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.Locale;
23 import java.util.Map;
24 import java.util.Properties;
25
26 import org.codehaus.plexus.util.Os;
27
28 /**
29 * Assists the project builder. <strong>Warning:</strong> This is an internal utility class that is only public for
30 * technical reasons, it is not part of the public API. In particular, this class can be changed or deleted without
31 * prior notice.
32 *
33 * @since 3.0
34 * @author Benjamin Bentmann
35 */
36 public class EnvironmentUtils
37 {
38
39 private static Properties envVars;
40
41 /**
42 * Adds the environment variables in the form of properties whose keys are prefixed with {@code env.}, e.g. {@code
43 * env.PATH}. Unlike native environment variables, properties are always case-sensitive. For the sake of
44 * determinism, the environment variable names will be normalized to upper case on platforms with case-insensitive
45 * variable lookup.
46 *
47 * @param props The properties to add the environment variables to, may be {@code null}.
48 */
49 public static void addEnvVars( Properties props )
50 {
51 if ( props != null )
52 {
53 if ( envVars == null )
54 {
55 Properties tmp = new Properties();
56 boolean caseSensitive = !Os.isFamily( Os.FAMILY_WINDOWS );
57 for ( Map.Entry<String, String> entry : System.getenv().entrySet() )
58 {
59 String key =
60 "env." + ( caseSensitive ? entry.getKey() : entry.getKey().toUpperCase( Locale.ENGLISH ) );
61 tmp.setProperty( key, entry.getValue() );
62 }
63 envVars = tmp;
64 }
65
66 props.putAll( envVars );
67 }
68 }
69
70 }