79 lines
2.7 KiB
Java
79 lines
2.7 KiB
Java
/*
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* Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.jndi.ldap;
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import java.net.MalformedURLException;
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import java.net.URL;
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abstract class VersionHelper {
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private static VersionHelper helper = null;
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VersionHelper() {} // Disallow anyone from creating one of these.
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static {
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try {
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Class.forName("java.net.URLClassLoader"); // 1.2 test
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Class.forName("java.security.PrivilegedAction"); // 1.2 test
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helper = (VersionHelper)
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Class.forName(
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"com.sun.jndi.ldap.VersionHelper12").newInstance();
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} catch (Exception e) {
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}
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// Use 1.1 helper if 1.2 test fails, or if we cannot create 1.2 helper
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if (helper == null) {
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try {
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helper = (VersionHelper)
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Class.forName(
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"com.sun.jndi.ldap.VersionHelper11").newInstance();
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} catch (Exception e) {
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// should never happen
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}
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}
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}
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static VersionHelper getVersionHelper() {
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return helper;
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}
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abstract ClassLoader getURLClassLoader(String[] url)
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throws MalformedURLException;
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static protected URL[] getUrlArray(String[] url) throws MalformedURLException {
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URL[] urlArray = new URL[url.length];
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for (int i = 0; i < urlArray.length; i++) {
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urlArray[i] = new URL(url[i]);
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}
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return urlArray;
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}
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abstract Class<?> loadClass(String className) throws ClassNotFoundException;
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abstract Thread createThread(Runnable r);
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}
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