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/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.security;

import java.security.Principal;
import java.util.ArrayList;
import java.util.HashMap;

import javax.security.auth.Subject;

import org.jboss.logging.Logger;

/**
 * The SecurityAssociation class maintains the security principal and
 * credentials. This can be done on either a singleton basis or a thread local
 * basis depending on the server property. When the server property has been set
 * to true, the security information is maintained in thread local storage. The
 * type of thread local storage depends on the org.jboss.security.SecurityAssociation.ThreadLocal
 * property. If this property is true, then the thread local storage object is
 * of type java.lang.ThreadLocal which results in the current thread's security
 * information NOT being propagated to child threads.
 *
 * When the property is false or does not exist, the thread local storage object
 * is of type java.lang.InheritableThreadLocal, and any threads spawned by the
 * current thread will inherit the security information of the current thread.
 * Subseqent changes to the current thread's security information are NOT
 * propagated to any previously spawned child threads.
 *
 * When the server property is false, security information is maintained in
 * class variables which makes the information available to all threads within
 * the current VM.
 * 
 * Note that this is not a public API class. Its an implementation detail that
 * is subject to change without notice.
 * 
 * @author Daniel O'Connor ([email protected])
 * @author [email protected]
 * @author [email protected]
 * @version $Revision: 107 $
 */
public final class SecurityAssociation
{
   private static Logger log = Logger.getLogger(SecurityAssociation.class);
   /**
    * A flag indicating if trace level logging should be performed
    */
   private static boolean trace;
   /**
    * A flag indicating if security information is global or thread local
    */
   private static boolean server;
   /**
    * The SecurityAssociation principal used when the server flag is false
    */
   private static Principal principal;
   /**
    * The SecurityAssociation credential used when the server flag is false
    */
   private static Object credential;

   /**
    * The SecurityAssociation principal used when the server flag is true
    */
   private static ThreadLocal threadPrincipal;
   /**
    * The SecurityAssociation credential used when the server flag is true
    */
   private static ThreadLocal