org.apache.naming.resources.DirContextURLStreamHandler 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.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;
import java.util.Hashtable;
import javax.naming.directory.DirContext;
/**
* Stream handler to a JNDI directory context.
*
* @author Remy Maucherat
* @version $Revision: 1079320 $
*/
public class DirContextURLStreamHandler extends URLStreamHandler {
// ----------------------------------------------------------- Constructors
public DirContextURLStreamHandler() {
// NOOP
}
public DirContextURLStreamHandler(DirContext context) {
this.context = context;
}
// -------------------------------------------------------------- Variables
/**
* Bindings class loader - directory context. Keyed by CL id.
*/
private static Hashtable clBindings =
new Hashtable();
/**
* Bindings thread - directory context. Keyed by thread id.
*/
private static Hashtable threadBindings =
new Hashtable();
// ----------------------------------------------------- Instance Variables
/**
* Directory context.
*/
protected DirContext context = null;
// ------------------------------------------------------------- Properties
// ----------------------------------------------- URLStreamHandler Methods
/**
* Opens a connection to the object referenced by the URL
* argument.
*/
@Override
protected URLConnection openConnection(URL u)
throws IOException {
DirContext currentContext = this.context;
if (currentContext == null)
currentContext = get();
return new DirContextURLConnection(currentContext, u);
}
// ------------------------------------------------------------ URL Methods
/**
* Override as part of the fix for 36534, to ensure toString is correct.
*/
@Override
protected String toExternalForm(URL u) {
// pre-compute length of StringBuilder
int len = u.getProtocol().length() + 1;
if (u.getPath() != null) {
len += u.getPath().length();
}
if (u.getQuery() != null) {
len += 1 + u.getQuery().length();
}
if (u.getRef() != null)
len += 1 + u.getRef().length();
StringBuilder result = new StringBuilder(len);
result.append(u.getProtocol());
result.append(":");
if (u.getPath() != null) {
result.append(u.getPath());
}
if (u.getQuery() != null) {
result.append('?');
result.append(u.getQuery());
}
if (u.getRef() != null) {
result.append("#");
result.append(u.getRef());
}
return result.toString();
}
// --------------------------------------------------------- Public Methods
/**
* Set the java.protocol.handler.pkgs system property. For use when
* embedding Tomcat and the embedding application has already set its own
* {@link java.net.URLStreamHandlerFactory}.
*/
public static void setProtocolHandler() {
String value = System.getProperty(Constants.PROTOCOL_HANDLER_VARIABLE);
if (value == null) {
value = Constants.Package;
System.setProperty(Constants.PROTOCOL_HANDLER_VARIABLE, value);
} else if (value.indexOf(Constants.Package) == -1) {
value += "|" + Constants.Package;
System.setProperty(Constants.PROTOCOL_HANDLER_VARIABLE, value);
}
}
/**
* Returns true if the thread or the context class loader of the current
* thread is bound.
*/
public static boolean isBound() {
return (clBindings.containsKey
(Thread.currentThread().getContextClassLoader()))
|| (threadBindings.containsKey(Thread.currentThread()));
}
/**
* Binds a directory context to a class loader.
*/
public static void bind(DirContext dirContext) {
ClassLoader currentCL =
Thread.currentThread().getContextClassLoader();
if (currentCL != null)
clBindings.put(currentCL, dirContext);
}
/**
* Unbinds a directory context to a class loader.
*/
public static void unbind() {
ClassLoader currentCL =
Thread.currentThread().getContextClassLoader();
if (currentCL != null)
clBindings.remove(currentCL);
}
/**
* Binds a directory context to a thread.
*/
public static void bindThread(DirContext dirContext) {
threadBindings.put(Thread.currentThread(), dirContext);
}
/**
* Unbinds a directory context to a thread.
*/
public static void unbindThread() {
threadBindings.remove(Thread.currentThread());
}
/**
* Get the bound context.
*/
public static DirContext get() {
DirContext result = null;
Thread currentThread = Thread.currentThread();
ClassLoader currentCL = currentThread.getContextClassLoader();
// Checking CL binding
result = clBindings.get(currentCL);
if (result != null)
return result;
// Checking thread biding
result = threadBindings.get(currentThread);
// Checking parent CL binding
currentCL = currentCL.getParent();
while (currentCL != null) {
result = clBindings.get(currentCL);
if (result != null)
return result;
currentCL = currentCL.getParent();
}
if (result == null)
throw new IllegalStateException("Illegal class loader binding");
return result;
}
/**
* Binds a directory context to a class loader.
*/
public static void bind(ClassLoader cl, DirContext dirContext) {
clBindings.put(cl, dirContext);
}
/**
* Unbinds a directory context to a class loader.
*/
public static void unbind(ClassLoader cl) {
clBindings.remove(cl);
}
/**
* Get the bound context.
*/
public static DirContext get(ClassLoader cl) {
return clBindings.get(cl);
}
/**
* Get the bound context.
*/
public static DirContext get(Thread thread) {
return threadBindings.get(thread);
}
}