javaurlcontextfactory.java

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// ========================================================================
// $Id: javaURLContextFactory.java 231 2006-02-19 15:09:58Z janb $
// Copyright 1999-2006 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// Licensed 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.mortbay.naming.java;

import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.Name;
import javax.naming.NamingException;
import javax.naming.spi.ObjectFactory;

import org.mortbay.log.Log;


/** javaURLContextFactory
 * <p>This is the URL context factory for the java: URL.
 *
 * <p><h4>Notes</h4>
 * <p>
 *
 * <p><h4>Usage</h4>
 * <pre>
 */
/*
* </pre>
*
* @see
*
* @author <a href="mailto:[e-mail]">Jan Bartel</a>
* @version 1.0
*/
public class javaURLContextFactory implements ObjectFactory 
{
        
    /**
     * Either return a new context or the resolution of a url.
     *
     * @param url an <code>Object</code> value
     * @param name a <code>Name</code> value
     * @param ctx a <code>Context</code> value
     * @param env a <code>Hashtable</code> value
     * @return a new context or the resolved object for the url
     * @exception Exception if an error occurs
     */
    public Object getObjectInstance(Object url, Name name, Context ctx, Hashtable env)
        throws Exception 
    {
        // null object means return a root context for doing resolutions
        if (url == null)
        {
            if(Log.isDebugEnabled())Log.debug(">>> new root context requested ");
            return new javaRootURLContext(env);
        }
        
        // return the resolution of the url
        if (url instanceof String)
        {
            if(Log.isDebugEnabled())Log.debug(">>> resolution of url "+url+" requested");
            Context rootctx = new javaRootURLContext (env);
            return rootctx.lookup ((String)url);
        }

        // return the resolution of at least one of the urls
        if (url instanceof String[])
        {
            if(Log.isDebugEnabled())Log.debug(">>> resolution of array of urls requested");
            String[] urls = (String[])url; 
            Context rootctx = new javaRootURLContext (env);
            Object object = null;
            NamingException e = null;
            for (int i=0;(i< urls.length) && (object == null); i++)
            {
                try
                {
                    object = rootctx.lookup (urls[i]);
                }
                catch (NamingException x)
                {
                    e = x;
                }
            }

            if (object == null)
                throw e;
            else
                return object;
        }

        if(Log.isDebugEnabled())Log.debug(">>> No idea what to do, so return a new root context anyway");
        return new javaRootURLContext (env);
    }
};