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package org.apache.naming.java;
import java.util.Hashtable;
import javax.naming.Name;
import javax.naming.Context;
import javax.naming.NamingException;
import javax.naming.spi.ObjectFactory;
import javax.naming.spi.InitialContextFactory;
import org.apache.naming.SelectorContext;
import org.apache.naming.NamingContext;
import org.apache.naming.ContextBindings;
/**
* Context factory for the "java:" namespace.
*
* Important note : This factory MUST be associated with the "java" URL
* prefix, which can be done by either :
*
* - Adding a
* java.naming.factory.url.pkgs=org.apache.catalina.util.naming property
* to the JNDI properties file
* - Setting an environment variable named Context.URL_PKG_PREFIXES with
* its value including the org.apache.catalina.util.naming package name.
* More detail about this can be found in the JNDI documentation :
* {@link javax.naming.spi.NamingManager#getURLContext(java.lang.String, java.util.Hashtable)}.
*
*
* @author Remy Maucherat
* @version $Revision: 1.2 $ $Date: 2005/12/08 01:29:08 $
*/
public class javaURLContextFactory
implements ObjectFactory, InitialContextFactory {
// ----------------------------------------------------------- Constructors
// -------------------------------------------------------------- Constants
public static final String MAIN = "initialContext";
// ----------------------------------------------------- Instance Variables
/**
* Initial context.
*/
protected static volatile Context initialContext = null;
// --------------------------------------------------------- Public Methods
// -------------------------------------------------- ObjectFactory Methods
/**
* Crete a new Context's instance.
*/
public Object getObjectInstance(Object obj, Name name, Context nameCtx,
Hashtable environment)
throws NamingException {
if ((ContextBindings.isThreadBound()) ||
(ContextBindings.isClassLoaderBound())) {
return new SelectorContext(castEnvironment(environment));
} else {
return null;
}
}
/**
* Get a new (writable) initial context.
*/
public Context getInitialContext(Hashtable environment)
throws NamingException {
if (ContextBindings.isThreadBound() ||
(ContextBindings.isClassLoaderBound())) {
// Redirect the request to the bound initial context
return new SelectorContext(castEnvironment(environment), true);
}
// If the thread is not bound, return a shared writable context
if (initialContext == null) {
synchronized(javaURLContextFactory.class) {
if (initialContext == null) {
initialContext = new NamingContext(
castEnvironment(environment), MAIN);
}
}
}
return initialContext;
}
@SuppressWarnings("unchecked")
private Hashtable castEnvironment(Hashtable env) {
return (Hashtable)env;
}
}