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  /*
   * JBoss, Home of Professional Open Source
   * Copyright 2006, Red Hat Middleware LLC, and individual contributors
   * as indicated by the @author tags. 
   * See the copyright.txt in the distribution for a full listing 
   * of individual contributors.
   * This copyrighted material is made available to anyone wishing to use,
   * modify, copy, or redistribute it subject to the terms and conditions
   * of the GNU Lesser General Public License, v. 2.1.
  * This program is distributed in the hope that it will be useful, but WITHOUT A
  * 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,
  * v.2.1 along with this distribution; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  * MA  02110-1301, USA.
  * 
  * (C) 2005-2006,
  * @author JBoss Inc.
  */
 /*
  * Copyright (C) 2002,
  *
  * Arjuna Technologies Limited,
  * Newcastle upon Tyne,
  * Tyne and Wear,
  * UK.
  *
  * $Id: ActivityHierarchy.java,v 1.1 2002/11/25 10:51:41 nmcl Exp $
  */
 
 package com.arjuna.mw.wsas.activity;

This class represents a handle on a stack of activities. It should only be used for suspending and resuming the thread-to-activity association. The activity at the top of the stack is the current activity.

Author(s):
Mark Little (mark.little@arjuna.com)
Version:
$Id: ActivityHierarchy.java,v 1.1 2002/11/25 10:51:41 nmcl Exp $
Since:
1.0.
 
 
 public interface ActivityHierarchy
 {
    

Returns:
the number of activities associated with this stack.
 
 
     public int size ();
    
    

Returns:
whether or not this is a valid context. If a single entry in the context is invalid then we assume the entire context is.
 
 
     public boolean valid ();

    

Parameters:
index index of the specific activity in the stack.
Returns:
the activity handle.
Throws:
java.lang.IndexOutOfBoundsException Thrown if the activity number is too large or small.
 
 
     public ActivityHandle activity (int indexthrows IndexOutOfBoundsException;

    

Returns:
the current activity in the context.
 
 
     public ActivityHandle current ();

    
Obtain a copy of this context. Although the context may be shared between different threads, the same instance of the context should not be.

Returns:
the context copy.
 
 
     public ActivityHierarchy copy ();

    
Overrides Object.equals Two contexts are equal if both hierarchies are identical.

Returns:
true if the two objects are the same, false otherwise.
 
 
     public boolean equals (Object obj);

    
Although users won't typically care what the underlying implementation of a context is, they will need to do comparisons. So, although this method is provided by Java.Object we have it here to ensure that we don't forget to implement it!

Returns:
the hash value for the target.
    public int hashCode ();
    
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