1 package org.apache.maven.shared.utils;
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.io.File;
23 import java.io.FileInputStream;
24 import java.io.IOException;
25 import java.io.InputStream;
26 import java.util.Properties;
27
28 import javax.annotation.Nonnull;
29 import javax.annotation.Nullable;
30
31 import org.apache.maven.shared.utils.io.IOUtil;
32
33 /**
34 *
35 */
36 public class PropertyUtils
37 {
38
39 /**
40 * The constructor.
41 */
42 public PropertyUtils()
43 {
44 // should throw new IllegalAccessError( "Utility class" );
45 }
46
47 /**
48 * @param url The URL which should be used to load the properties.
49 * @return The loaded properties.
50 */
51 public static java.util.Properties loadProperties( @Nonnull java.net.URL url )
52 {
53 try
54 {
55 return loadProperties( url.openStream() );
56 }
57 catch ( Exception e )
58 {
59 // ignore
60 }
61 return null;
62 }
63
64 /**
65 * @param file The file from which the properties will be loaded.
66 * @return The loaded properties.
67 */
68 public static Properties loadProperties( @Nonnull File file )
69 {
70 try
71 {
72 return loadProperties( new FileInputStream( file ) );
73 }
74 catch ( Exception e )
75 {
76 // ignore
77 }
78 return null;
79 }
80
81 /**
82 * @param is {@link InputStream}
83 * @return The loaded properties.
84 */
85 public static Properties loadProperties( @Nullable InputStream is )
86 {
87 try
88 {
89 // to make this the same behaviour as the others we should really return null on any error
90 Properties result = new Properties();
91 if ( is != null )
92 {
93 try
94 {
95 result.load( is );
96 }
97 catch ( IOException e )
98 {
99 // ignore
100 }
101 }
102 return result;
103 }
104 catch ( Exception e )
105 {
106 // ignore
107 }
108 finally
109 {
110 IOUtil.close( is );
111 }
112 return null;
113 }
114
115 }