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From a..@apache.org
Subject cvs commit: incubator-geronimo/modules/core/src/java/org/apache/geronimo/security/util ContextManager.java
Date Sat, 08 Nov 2003 22:40:28 GMT
adc         2003/11/08 14:40:28

  Added:       modules/core/src/java/org/apache/geronimo/security/util
                        ContextManager.java
  Log:
  Keeps track of the AccessControlContexts for each thread.
  
  Revision  Changes    Path
  1.1                  incubator-geronimo/modules/core/src/java/org/apache/geronimo/security/util/ContextManager.java
  
  Index: ContextManager.java
  ===================================================================
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2003 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http:www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" and
   *    "Apache Geronimo" must not be used to endorse or promote products
   *    derived from this software without prior written permission. For
   *    written permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    "Apache Geronimo", nor may "Apache" appear in their name, without
   *    prior written permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http:www.apache.org/>.
   *
   * ====================================================================
   */
  package org.apache.geronimo.security.util;
  
  import org.apache.geronimo.security.GeronimoSecurityPermission;
  
  import java.util.Stack;
  import java.security.AccessControlContext;
  
  
  /**
   *
   * @version $Revision: 1.1 $ $Date: 2003/11/08 22:40:28 $
   */
  
  public class ContextManager {
      private static ContextThreadLocalStack contexts = new ContextThreadLocalStack();
  
      public static final GeronimoSecurityPermission GET_CONTEXT = new GeronimoSecurityPermission("getContext");
      public static final GeronimoSecurityPermission SET_CONTEXT = new GeronimoSecurityPermission("setContext");
  
      public static AccessControlContext peekContext() {
          SecurityManager sm = System.getSecurityManager();
          if (sm != null) sm.checkPermission(GET_CONTEXT);
  
          return contexts.peek();
      }
  
      public static AccessControlContext popContext() {
          SecurityManager sm = System.getSecurityManager();
          if (sm != null) sm.checkPermission(SET_CONTEXT);
  
          return contexts.pop();
      }
  
      public static void pushContext(AccessControlContext context) {
          SecurityManager sm = System.getSecurityManager();
          if (sm != null) sm.checkPermission(SET_CONTEXT);
  
          contexts.push(context);
      }
  
      private static class ContextThreadLocalStack extends ThreadLocal {
          protected Object initialValue() {
              return new Stack();
          }
  
          void push(AccessControlContext runAs) {
              Stack stack = (Stack) super.get();
              stack.push(runAs);
          }
  
          AccessControlContext pop() {
              Stack stack = (Stack) super.get();
              return (AccessControlContext) stack.pop();
          }
  
          AccessControlContext peek() {
              Stack stack = (Stack) super.get();
              return (AccessControlContext) stack.peek();
          }
      }
  }
  
  
  

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