001: /*
002: * $Header: /home/cvs/jakarta-tomcat-4.0/catalina/src/share/org/apache/naming/java/javaURLContextFactory.java,v 1.2 2001/01/25 18:35:35 remm Exp $
003: * $Revision: 1.2 $
004: * $Date: 2001/01/25 18:35:35 $
005: *
006: * ====================================================================
007: *
008: * The Apache Software License, Version 1.1
009: *
010: * Copyright (c) 1999 The Apache Software Foundation. All rights
011: * reserved.
012: *
013: * Redistribution and use in source and binary forms, with or without
014: * modification, are permitted provided that the following conditions
015: * are met:
016: *
017: * 1. Redistributions of source code must retain the above copyright
018: * notice, this list of conditions and the following disclaimer.
019: *
020: * 2. Redistributions in binary form must reproduce the above copyright
021: * notice, this list of conditions and the following disclaimer in
022: * the documentation and/or other materials provided with the
023: * distribution.
024: *
025: * 3. The end-user documentation included with the redistribution, if
026: * any, must include the following acknowlegement:
027: * "This product includes software developed by the
028: * Apache Software Foundation (http://www.apache.org/)."
029: * Alternately, this acknowlegement may appear in the software itself,
030: * if and wherever such third-party acknowlegements normally appear.
031: *
032: * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
033: * Foundation" must not be used to endorse or promote products derived
034: * from this software without prior written permission. For written
035: * permission, please contact apache@apache.org.
036: *
037: * 5. Products derived from this software may not be called "Apache"
038: * nor may "Apache" appear in their names without prior written
039: * permission of the Apache Group.
040: *
041: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
042: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
043: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
044: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
045: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
046: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
047: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
048: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
049: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
050: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
051: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
052: * SUCH DAMAGE.
053: * ====================================================================
054: *
055: * This software consists of voluntary contributions made by many
056: * individuals on behalf of the Apache Software Foundation. For more
057: * information on the Apache Software Foundation, please see
058: * <http://www.apache.org/>.
059: *
060: * [Additional notices, if required by prior licensing conditions]
061: *
062: */
063:
064: package org.apache.naming.java;
065:
066: import java.util.Hashtable;
067: import javax.naming.Name;
068: import javax.naming.Context;
069: import javax.naming.NamingException;
070: import javax.naming.spi.ObjectFactory;
071: import javax.naming.spi.InitialContextFactory;
072: import org.apache.naming.SelectorContext;
073: import org.apache.naming.NamingContext;
074: import org.apache.naming.ContextBindings;
075:
076: /**
077: * Context factory for the "java:" namespace.
078: * <p>
079: * <b>Important note</b> : This factory MUST be associated with the "java" URL
080: * prefix, which can be done by either :
081: * <ul>
082: * <li>Adding a
083: * java.naming.factory.url.pkgs=org.apache.catalina.util.naming property
084: * to the JNDI properties file</li>
085: * <li>Setting an environment variable named Context.URL_PKG_PREFIXES with
086: * its value including the org.apache.catalina.util.naming package name.
087: * More detail about this can be found in the JNDI documentation :
088: * {@link javax.naming.spi.NamingManager#getURLContext(java.lang.String, java.util.Hashtable)}.</li>
089: * </ul>
090: *
091: * @author Remy Maucherat
092: * @version $Revision: 1.2 $ $Date: 2001/01/25 18:35:35 $
093: */
094:
095: public class javaURLContextFactory implements ObjectFactory,
096: InitialContextFactory {
097:
098: // ----------------------------------------------------------- Constructors
099:
100: // -------------------------------------------------------------- Constants
101:
102: public static final String MAIN = "initialContext";
103:
104: // ----------------------------------------------------- Instance Variables
105:
106: /**
107: * Initial context.
108: */
109: protected static Context initialContext = null;
110:
111: // --------------------------------------------------------- Public Methods
112:
113: // -------------------------------------------------- ObjectFactory Methods
114:
115: /**
116: * Crete a new Context's instance.
117: */
118: public Object getObjectInstance(Object obj, Name name,
119: Context nameCtx, Hashtable environment)
120: throws NamingException {
121: if ((ContextBindings.isThreadBound())
122: || (ContextBindings.isClassLoaderBound())) {
123: return new SelectorContext(environment);
124: } else {
125: return null;
126: }
127: }
128:
129: /**
130: * Get a new (writable) initial context.
131: */
132: public Context getInitialContext(Hashtable environment)
133: throws NamingException {
134: if (ContextBindings.isThreadBound()
135: || (ContextBindings.isClassLoaderBound())) {
136: // Redirect the request to the bound initial context
137: return new SelectorContext(environment, true);
138: } else {
139: // If the thread is not bound, return a shared writable context
140: if (initialContext == null)
141: initialContext = new NamingContext(environment, MAIN);
142: return initialContext;
143: }
144: }
145:
146: }
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