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Tomcat example source code file (ContextBindings.java)

This example Tomcat source code file (ContextBindings.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

classloader, context, context, contextbindings, hashtable, hashtable, naming, namingexception, namingexception, object, object, stringmanager, util

The Tomcat ContextBindings.java source code

/*
 * 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;

import java.util.Hashtable;
import javax.naming.NamingException;
import javax.naming.Context;

/**
 * Handles the associations :
 * <ul>
 * <li>Catalina context name with the NamingContext
 * <li>Calling thread with the NamingContext
 * </ul>
 *
 * @author Remy Maucherat
 * @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
 */

public class ContextBindings {


    // -------------------------------------------------------------- Variables


    /**
     * Bindings name - naming context. Keyed by name.
     */
    private static Hashtable contextNameBindings = new Hashtable();


    /**
     * Bindings thread - naming context. Keyed by thread id.
     */
    private static Hashtable threadBindings = new Hashtable();


    /**
     * Bindings thread - name. Keyed by thread id.
     */
    private static Hashtable threadNameBindings = new Hashtable();


    /**
     * Bindings class loader - naming context. Keyed by CL id.
     */
    private static Hashtable clBindings = new Hashtable();


    /**
     * Bindings class loader - name. Keyed by CL id.
     */
    private static Hashtable clNameBindings = new Hashtable();


    /**
     * The string manager for this package.
     */
    protected static StringManager sm = 
        StringManager.getManager(Constants.Package);


    // --------------------------------------------------------- Public Methods


    /**
     * Binds a context name.
     * 
     * @param name Name of the context
     * @param context Associated naming context instance
     */
    public static void bindContext(Object name, Context context) {
        bindContext(name, context, null);
    }


    /**
     * Binds a context name.
     * 
     * @param name Name of the context
     * @param context Associated naming context instance
     * @param token Security token
     */
    public static void bindContext(Object name, Context context, 
                                   Object token) {
        if (ContextAccessController.checkSecurityToken(name, token))
            contextNameBindings.put(name, context);
    }


    /**
     * Unbind context name.
     * 
     * @param name Name of the context
     */
    public static void unbindContext(Object name) {
        unbindContext(name, null);
    }


    /**
     * Unbind context name.
     * 
     * @param name Name of the context
     * @param token Security token
     */
    public static void unbindContext(Object name, Object token) {
        if (ContextAccessController.checkSecurityToken(name, token))
            contextNameBindings.remove(name);
    }


    /**
     * Retrieve a naming context.
     * 
     * @param name Name of the context
     */
    static Context getContext(Object name) {
        return (Context) contextNameBindings.get(name);
    }


    /**
     * Binds a naming context to a thread.
     * 
     * @param name Name of the context
     */
    public static void bindThread(Object name) 
        throws NamingException {
        bindThread(name, null);
    }


    /**
     * Binds a naming context to a thread.
     * 
     * @param name Name of the context
     * @param token Security token
     */
    public static void bindThread(Object name, Object token) 
        throws NamingException {
        if (ContextAccessController.checkSecurityToken(name, token)) {
            Context context = (Context) contextNameBindings.get(name);
            if (context == null)
                throw new NamingException
                    (sm.getString("contextBindings.unknownContext", name));
            threadBindings.put(Thread.currentThread(), context);
            threadNameBindings.put(Thread.currentThread(), name);
        }
    }


    /**
     * Unbinds a naming context to a thread.
     * 
     * @param name Name of the context
     */
    public static void unbindThread(Object name) {
        unbindThread(name, null);
    }


    /**
     * Unbinds a naming context to a thread.
     * 
     * @param name Name of the context
     * @param token Security token
     */
    public static void unbindThread(Object name, Object token) {
        if (ContextAccessController.checkSecurityToken(name, token)) {
            threadBindings.remove(Thread.currentThread());
            threadNameBindings.remove(Thread.currentThread());
        }
    }


    /**
     * Retrieves the naming context bound to a thread.
     */
    public static Context getThread()
        throws NamingException {
        Context context = 
            (Context) threadBindings.get(Thread.currentThread());
        if (context == null)
            throw new NamingException
                (sm.getString("contextBindings.noContextBoundToThread"));
        return context;
    }


    /**
     * Retrieves the naming context name bound to a thread.
     */
    static Object getThreadName()
        throws NamingException {
        Object name = threadNameBindings.get(Thread.currentThread());
        if (name == null)
            throw new NamingException
                (sm.getString("contextBindings.noContextBoundToThread"));
        return name;
    }


    /**
     * Tests if current thread is bound to a context.
     */
    public static boolean isThreadBound() {
        return (threadBindings.containsKey(Thread.currentThread()));
    }


    /**
     * Binds a naming context to a class loader.
     * 
     * @param name Name of the context
     */
    public static void bindClassLoader(Object name) 
        throws NamingException {
        bindClassLoader(name, null);
    }


    /**
     * Binds a naming context to a thread.
     * 
     * @param name Name of the context
     * @param token Security token
     */
    public static void bindClassLoader(Object name, Object token) 
        throws NamingException {
        bindClassLoader
            (name, token, Thread.currentThread().getContextClassLoader());
    }


    /**
     * Binds a naming context to a thread.
     * 
     * @param name Name of the context
     * @param token Security token
     */
    public static void bindClassLoader(Object name, Object token, 
                                       ClassLoader classLoader) 
        throws NamingException {
        if (ContextAccessController.checkSecurityToken(name, token)) {
            Context context = (Context) contextNameBindings.get(name);
            if (context == null)
                throw new NamingException
                    (sm.getString("contextBindings.unknownContext", name));
            clBindings.put(classLoader, context);
            clNameBindings.put(classLoader, name);
        }
    }


    /**
     * Unbinds a naming context to a class loader.
     * 
     * @param name Name of the context
     */
    public static void unbindClassLoader(Object name) {
        unbindClassLoader(name, null);
    }


    /**
     * Unbinds a naming context to a class loader.
     * 
     * @param name Name of the context
     * @param token Security token
     */
    public static void unbindClassLoader(Object name, Object token) {
        unbindClassLoader(name, token, 
                          Thread.currentThread().getContextClassLoader());
    }


    /**
     * Unbinds a naming context to a class loader.
     * 
     * @param name Name of the context
     * @param token Security token
     */
    public static void unbindClassLoader(Object name, Object token, 
                                         ClassLoader classLoader) {
        if (ContextAccessController.checkSecurityToken(name, token)) {
            Object n = clNameBindings.get(classLoader);
            if ((n==null) || !(n.equals(name))) {
                return;
            }
            clBindings.remove(classLoader);
            clNameBindings.remove(classLoader);
        }
    }


    /**
     * Retrieves the naming context bound to a class loader.
     */
    public static Context getClassLoader()
        throws NamingException {
        ClassLoader cl = Thread.currentThread().getContextClassLoader();
        Context context = null;
        do {
            context = (Context) clBindings.get(cl);
            if (context != null) {
                return context;
            }
        } while ((cl = cl.getParent()) != null);
        throw new NamingException
            (sm.getString("contextBindings.noContextBoundToCL"));
    }


    /**
     * Retrieves the naming context name bound to a class loader.
     */
    static Object getClassLoaderName()
        throws NamingException {
        ClassLoader cl = Thread.currentThread().getContextClassLoader();
        Object name = null;
        do {
            name = clNameBindings.get(cl);
            if (name != null) {
                return name;
            }
        } while ((cl = cl.getParent()) != null);
        throw new NamingException
            (sm.getString("contextBindings.noContextBoundToCL"));
    }


    /**
     * Tests if current class loader is bound to a context.
     */
    public static boolean isClassLoaderBound() {
        ClassLoader cl = Thread.currentThread().getContextClassLoader();
        do {
            if (clBindings.containsKey(cl)) {
                return true;
            }
        } while ((cl = cl.getParent()) != null);
        return false;
    }


}

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