01: /*
02: * Copyright 1999 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * 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: */
25:
26: package com.sun.jndi.ldap;
27:
28: import java.net.MalformedURLException;
29: import java.net.URL;
30:
31: abstract class VersionHelper {
32:
33: private static VersionHelper helper = null;
34:
35: VersionHelper() {
36: } // Disallow anyone from creating one of these.
37:
38: static {
39: try {
40: Class.forName("java.net.URLClassLoader"); // 1.2 test
41: Class.forName("java.security.PrivilegedAction"); // 1.2 test
42: helper = (VersionHelper) Class.forName(
43: "com.sun.jndi.ldap.VersionHelper12").newInstance();
44: } catch (Exception e) {
45: }
46:
47: // Use 1.1 helper if 1.2 test fails, or if we cannot create 1.2 helper
48: if (helper == null) {
49: try {
50: helper = (VersionHelper) Class.forName(
51: "com.sun.jndi.ldap.VersionHelper11")
52: .newInstance();
53: } catch (Exception e) {
54: // should never happen
55: }
56: }
57: }
58:
59: static VersionHelper getVersionHelper() {
60: return helper;
61: }
62:
63: abstract ClassLoader getURLClassLoader(String[] url)
64: throws MalformedURLException;
65:
66: static protected URL[] getUrlArray(String[] url)
67: throws MalformedURLException {
68: URL[] urlArray = new URL[url.length];
69: for (int i = 0; i < urlArray.length; i++) {
70: urlArray[i] = new URL(url[i]);
71: }
72: return urlArray;
73: }
74:
75: abstract Class loadClass(String className)
76: throws ClassNotFoundException;
77:
78: abstract Thread createThread(Runnable r);
79: }
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