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Tomcat example source code file (ContextAccessController.java)

This example Tomcat source code file (ContextAccessController.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

contextaccesscontroller, contextaccesscontroller, hashtable, hashtable, object, object, util

The Tomcat ContextAccessController.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;

/**
 * Handles the access control on the JNDI contexts.
 *
 * @author Remy Maucherat
 * @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
 */

public class ContextAccessController {


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


    /**
     * Catalina context names on which writing is not allowed.
     */
    private static Hashtable readOnlyContexts = new Hashtable();


    /**
     * Security tokens repository.
     */
    private static Hashtable securityTokens = new Hashtable();


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


    /**
     * Set a security token for a context. Can be set only once.
     * 
     * @param name Name of the context
     * @param token Security token
     */
    public static void setSecurityToken(Object name, Object token) {
        if ((!securityTokens.containsKey(name)) && (token != null)) {
            securityTokens.put(name, token);
        }
    }


    /**
     * Remove a security token for a context.
     * 
     * @param name Name of the context
     * @param token Security token
     */
    public static void unsetSecurityToken(Object name, Object token) {
        if (checkSecurityToken(name, token)) {
            securityTokens.remove(name);
        }
    }


    /**
     * Check a submitted security token. The submitted token must be equal to
     * the token present in the repository. If no token is present for the 
     * context, then returns true.
     * 
     * @param name Name of the context
     * @param token Submitted security token
     */
    public static boolean checkSecurityToken
        (Object name, Object token) {
        Object refToken = securityTokens.get(name);
        if (refToken == null)
            return (true);
        if ((refToken != null) && (refToken.equals(token)))
            return (true);
        return (false);
    }


    /**
     * Allow writing to a context.
     * 
     * @param name Name of the context
     * @param token Security token
     */
    public static void setWritable(Object name, Object token) {
        if (checkSecurityToken(name, token))
            readOnlyContexts.remove(name);
    }


    /**
     * Set whether or not a context is writable.
     * 
     * @param name Name of the context
     */
    public static void setReadOnly(Object name) {
        readOnlyContexts.put(name, name);
    }


    /**
     * Returns if a context is writable.
     * 
     * @param name Name of the context
     */
    public static boolean isWritable(Object name) {
        return !(readOnlyContexts.containsKey(name));
    }


}

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