1 //
2 // ========================================================================
3 // Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
4 // ------------------------------------------------------------------------
5 // All rights reserved. This program and the accompanying materials
6 // are made available under the terms of the Eclipse Public License v1.0
7 // and Apache License v2.0 which accompanies this distribution.
8 //
9 // The Eclipse Public License is available at
10 // http://www.eclipse.org/legal/epl-v10.html
11 //
12 // The Apache License v2.0 is available at
13 // http://www.opensource.org/licenses/apache2.0.php
14 //
15 // You may elect to redistribute this code under either of these licenses.
16 // ========================================================================
17 //
18
19
20 package org.eclipse.jetty.osgi.boot.utils;
21
22 import java.net.MalformedURLException;
23 import java.net.URL;
24 import java.util.ArrayList;
25 import java.util.Dictionary;
26 import java.util.List;
27 import java.util.StringTokenizer;
28
29 /**
30 * Various useful functions utility methods for OSGi wide use.
31 */
32 public class Util
33 {
34 public static final String DEFAULT_DELIMS = ",;";
35
36
37 /**
38 * Get the value of a manifest header.
39 *
40 * @param name the name of the header
41 * @param altName an alternative name for the header (useful for deprecated names)
42 * @param manifest the dictionary
43 * @return the value from the manifest
44 */
45 public static String getManifestHeaderValue (String name, String altName, Dictionary manifest)
46 {
47 if (manifest == null)
48 return null;
49 if (name == null && altName == null)
50 return null;
51 if (name != null)
52 return (String)manifest.get(name);
53 return (String)manifest.get(altName);
54 }
55
56
57
58 /* ------------------------------------------------------------ */
59 /**
60 * Treating the string as a separated list of filenames,
61 * convert and return the list of urls.
62 *
63 * @param val the separated list of filenames
64 * @param delims the separators (default is <code>,;</code>)
65 * @return the list of URLs found in the input list
66 * @throws Exception if unable to convert entry to a URL
67 */
68 public static List<URL> fileNamesAsURLs(String val, String delims)
69 throws Exception
70 {
71 String separators = DEFAULT_DELIMS;
72 if (delims == null)
73 delims = separators;
74
75 StringTokenizer tokenizer = new StringTokenizer(val, delims, false);
76 List<URL> urls = new ArrayList<URL>();
77 while (tokenizer.hasMoreTokens())
78 {
79 urls.add(BundleFileLocatorHelperFactory.getFactory().getHelper().getLocalURL(new URL(tokenizer.nextToken())));
80 }
81 return urls;
82 }
83
84
85 /* ------------------------------------------------------------ */
86 public static void setProperty(Dictionary<String,String> properties, String key, String value)
87 {
88 if (value != null)
89 {
90 properties.put(key, value);
91 }
92 }
93
94
95 /* ------------------------------------------------------------ */
96 /**
97 * recursively substitute the <code>${sysprop}</code> by their actual system property.
98 * <code>${sysprop,defaultvalue}</code> will use <code>'defaultvalue'</code> as the value if no
99 * sysprop is defined. Not the most efficient code but we are shooting for
100 * simplicity and speed of development here.
101 *
102 * @param value the input string
103 * @return the string with replaced properties
104 */
105 public static String resolvePropertyValue(String value)
106 {
107 int ind = value.indexOf("${");
108 if (ind == -1) { return value; }
109 int ind2 = value.indexOf('}', ind);
110 if (ind2 == -1) { return value; }
111 String sysprop = value.substring(ind + 2, ind2);
112 String defaultValue = null;
113 int comma = sysprop.indexOf(',');
114 if (comma != -1 && comma + 1 != sysprop.length())
115 {
116 defaultValue = sysprop.substring(comma + 1);
117 defaultValue = resolvePropertyValue(defaultValue);
118 sysprop = sysprop.substring(0, comma);
119 }
120 else
121 {
122 defaultValue = "${" + sysprop + "}";
123 }
124
125 String v = System.getProperty(sysprop);
126
127 String reminder = value.length() > ind2 + 1 ? value.substring(ind2 + 1) : "";
128 reminder = resolvePropertyValue(reminder);
129 if (v != null)
130 {
131 return value.substring(0, ind) + v + reminder;
132 }
133 else
134 {
135 return value.substring(0, ind) + defaultValue + reminder;
136 }
137 }
138 }