jdk/test/java/net/URL/HandlerLoop.java
author duke
Sat, 01 Dec 2007 00:00:00 +0000
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/*
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 * Copyright 1998 Sun Microsystems, Inc.  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.
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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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 */
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import java.io.*;
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/*
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 * @test
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 * @bug 4135031
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 * @summary Test boostrap problem when a URLStreamHandlerFactory is loaded
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 *          by the application class loader.
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 *
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 */
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import java.net.*;
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public class HandlerLoop {
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    public static void main(String args[]) throws Exception {
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        URL.setURLStreamHandlerFactory(
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            new HandlerFactory("sun.net.www.protocol"));
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        URL url = new URL("file://bogus/index.html");
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        System.out.println("url = " + url);
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        url.openConnection();
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    }
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    private static class HandlerFactory implements URLStreamHandlerFactory {
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        private String pkg;
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        HandlerFactory(String pkg) {
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            this.pkg = pkg;
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        }
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        public URLStreamHandler createURLStreamHandler(String protocol) {
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            String name = pkg + "." + protocol + ".Handler";
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            System.out.println("Loading handler class: " + name);
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            // Loading this dummy class demonstrates the bootstrap
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            // problem as the stream handler factory will be reentered
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            // over and over again if the application class loader
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            // shares the same stream handler factory.
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            new Dummy();
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            try {
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                Class c = Class.forName(name);
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                return (URLStreamHandler)c.newInstance();
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            } catch (ClassNotFoundException e) {
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                e.printStackTrace();
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            } catch (IllegalAccessException e) {
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                e.printStackTrace();
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            } catch (InstantiationException e) {
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                e.printStackTrace();
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            }
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            return null;
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        }
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    }
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    private static class Dummy {
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    }
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}