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/**
* Author: Sven Gothel <sgothel@jausoft.com>
* Copyright (c) 2021 Gothel Software e.K.
* Copyright (c) 2012 Gothel Software e.K.
* Copyright (c) 2013 JogAmp Community.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package org.jau.net;
import java.net.URL;
import java.net.URLStreamHandler;
import java.net.URLStreamHandlerFactory;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.HashMap;
import java.util.Map;
public class GenericURLStreamHandlerFactory implements URLStreamHandlerFactory {
private static GenericURLStreamHandlerFactory factory = null;
private final Map<String, URLStreamHandler> protocolHandlers;
private GenericURLStreamHandlerFactory() {
protocolHandlers = new HashMap<String, URLStreamHandler>();
}
/**
* Sets the <code>handler</code> for <code>protocol</code>.
*
* @return the previous set <code>handler</code>, or null if none was set.
*/
public synchronized final URLStreamHandler setHandler(final String protocol, final URLStreamHandler handler) {
return protocolHandlers.put(protocol, handler);
}
/**
* Returns the <code>protocol</code> handler previously set via {@link #setHandler(String, URLStreamHandler)},
* or null if none was set.
*/
public synchronized final URLStreamHandler getHandler(final String protocol) {
return protocolHandlers.get(protocol);
}
@Override
public synchronized final URLStreamHandler createURLStreamHandler(final String protocol) {
return getHandler(protocol);
}
/**
* Returns the singleton instance of the registered GenericURLStreamHandlerFactory
* or null if registration was not successful.
* <p>
* Registration is only performed once.
* </p>
*/
public synchronized static GenericURLStreamHandlerFactory register() {
if(null == factory) {
factory = AccessController.doPrivileged(new PrivilegedAction<GenericURLStreamHandlerFactory>() {
@Override
public GenericURLStreamHandlerFactory run() {
boolean ok = false;
final GenericURLStreamHandlerFactory f = new GenericURLStreamHandlerFactory();
try {
URL.setURLStreamHandlerFactory(f);
ok = true;
} catch (final Throwable e) {
System.err.println("GenericURLStreamHandlerFactory: Setting URLStreamHandlerFactory failed: "+e.getMessage());
}
return ok ? f : null;
} } );
}
return factory;
}
}
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