org.apache.naming.resources.DirContextURLStreamHandlerFactory Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.naming.resources;
import java.net.URLStreamHandler;
import java.net.URLStreamHandlerFactory;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* Factory for Stream handlers to a JNDI directory context,
* or for Stream handlers to a classpath url,
* which also supports users specifying additional stream handler.
*
* @author Remy Maucherat
*/
public class DirContextURLStreamHandlerFactory
implements URLStreamHandlerFactory {
// Singleton
private static DirContextURLStreamHandlerFactory instance =
new DirContextURLStreamHandlerFactory();
public static DirContextURLStreamHandlerFactory getInstance() {
return instance;
}
public static void addUserFactory(URLStreamHandlerFactory factory) {
instance.userFactories.add(factory);
}
private List userFactories =
new CopyOnWriteArrayList();
private DirContextURLStreamHandlerFactory() {
// Hide the default constructor
}
/**
* Creates a new URLStreamHandler instance with the specified protocol.
* Will return null if the protocol is not jndi.
*
* @param protocol the protocol (must be "jndi" here)
* @return a URLStreamHandler for the jndi protocol, or null if the
* protocol is not JNDI
*/
@Override
public URLStreamHandler createURLStreamHandler(String protocol) {
if (protocol.equals("jndi")) {
return new DirContextURLStreamHandler();
} else if (protocol.equals("classpath")) {
return new ClasspathURLStreamHandler();
} else {
for (URLStreamHandlerFactory factory : userFactories) {
URLStreamHandler handler =
factory.createURLStreamHandler(protocol);
if (handler != null) {
return handler;
}
}
return null;
}
}
}