Thu, 24 Jul 2008 19:06:57 +0100
6717241: some diagnostic argument is prematurely converted into a String object
Summary: removed early toString() conversions applied to diagnostic arguments
Reviewed-by: jjg
1 /*
2 * Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
26 package com.sun.tools.javac.processing;
28 import java.io.BufferedReader;
29 import java.io.FileNotFoundException;
30 import java.io.IOException;
31 import java.io.InputStream;
32 import java.io.InputStreamReader;
33 import java.net.MalformedURLException;
34 import java.net.URL;
35 import java.util.ArrayList;
36 import java.util.Iterator;
37 import java.util.List;
38 import java.util.Set;
40 /**
41 * Utility class to determine if a service can be found on the
42 * path that might be used to create a class loader.
43 *
44 * <p><b>This is NOT part of any API supported by Sun Microsystems.
45 * If you write code that depends on this, you do so at your own risk.
46 * This code and its internal interfaces are subject to change or
47 * deletion without notice.</b>
48 *
49 */
50 // based on sun.misc.Service
51 class ServiceProxy {
52 static class ServiceConfigurationError extends Error {
53 static final long serialVersionUID = 7732091036771098303L;
55 ServiceConfigurationError(String msg) {
56 super(msg);
57 }
58 }
60 private static final String prefix = "META-INF/services/";
62 private static void fail(Class service, String msg)
63 throws ServiceConfigurationError {
64 throw new ServiceConfigurationError(service.getName() + ": " + msg);
65 }
67 private static void fail(Class service, URL u, int line, String msg)
68 throws ServiceConfigurationError {
69 fail(service, u + ":" + line + ": " + msg);
70 }
72 /**
73 * Parse the content of the given URL as a provider-configuration file.
74 *
75 * @param service
76 * The service class for which providers are being sought;
77 * used to construct error detail strings
78 *
79 * @param url
80 * The URL naming the configuration file to be parsed
81 *
82 * @return true if the name of a service is found
83 *
84 * @throws ServiceConfigurationError
85 * If an I/O error occurs while reading from the given URL, or
86 * if a configuration-file format error is detected
87 */
88 private static boolean parse(Class service, URL u) throws ServiceConfigurationError {
89 InputStream in = null;
90 BufferedReader r = null;
91 try {
92 in = u.openStream();
93 r = new BufferedReader(new InputStreamReader(in, "utf-8"));
94 int lc = 1;
95 String ln;
96 while ((ln = r.readLine()) != null) {
97 int ci = ln.indexOf('#');
98 if (ci >= 0) ln = ln.substring(0, ci);
99 ln = ln.trim();
100 int n = ln.length();
101 if (n != 0) {
102 if ((ln.indexOf(' ') >= 0) || (ln.indexOf('\t') >= 0))
103 fail(service, u, lc, "Illegal configuration-file syntax");
104 int cp = ln.codePointAt(0);
105 if (!Character.isJavaIdentifierStart(cp))
106 fail(service, u, lc, "Illegal provider-class name: " + ln);
107 for (int i = Character.charCount(cp); i < n; i += Character.charCount(cp)) {
108 cp = ln.codePointAt(i);
109 if (!Character.isJavaIdentifierPart(cp) && (cp != '.'))
110 fail(service, u, lc, "Illegal provider-class name: " + ln);
111 }
112 return true;
113 }
114 }
115 } catch (FileNotFoundException x) {
116 return false;
117 } catch (IOException x) {
118 fail(service, ": " + x);
119 } finally {
120 try {
121 if (r != null) r.close();
122 } catch (IOException y) {
123 fail(service, ": " + y);
124 }
125 try {
126 if (in != null) in.close();
127 } catch (IOException y) {
128 fail(service, ": " + y);
129 }
130 }
131 return false;
132 }
134 /**
135 * Return true if a description for at least one service is found in the
136 * service configuration files in the given URLs.
137 */
138 public static boolean hasService(Class<?> service, URL[] urls)
139 throws ServiceConfigurationError {
140 for (URL url: urls) {
141 try {
142 String fullName = prefix + service.getName();
143 URL u = new URL(url, fullName);
144 boolean found = parse(service, u);
145 if (found)
146 return true;
147 } catch (MalformedURLException e) {
148 // should not happen; ignore it if it does
149 }
150 }
151 return false;
152 }
153 }