com.arjuna.mwlabs.wsas.activity.ActivityHierarchyImple Maven / Gradle / Ivy
/*
* 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: ActivityHierarchyImple.java,v 1.1 2002/11/25 10:51:45 nmcl Exp $
*/
package com.arjuna.mwlabs.wsas.activity;
import com.arjuna.mwlabs.wsas.activity.ActivityImple;
import com.arjuna.mw.wsas.activity.ActivityHierarchy;
import com.arjuna.mw.wsas.activity.ActivityHandle;
import java.util.Stack;
/**
* 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.
*/
public class ActivityHierarchyImple implements ActivityHierarchy
{
public ActivityHierarchyImple (ActivityImple current)
{
_hierarchy = new Stack();
if (current != null)
{
ActivityImple[] hierarchy = current.hierarchy();
for (int i = 0; i < hierarchy.length; i++)
_hierarchy.push(new ActivityHandleImple(hierarchy[i]));
_valid = true;
}
else
_valid = false;
}
/**
* @return the number of activities associated with this stack.
*/
public int size ()
{
return _hierarchy.size();
}
/**
* @return 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 ()
{
return _valid;
}
/**
* @param the specific activity in the stack.
* @exception IndexOutOfBoundsException Thrown if the activity number
* is too large or small.
* @return the activity handle.
*/
public ActivityHandle activity (int index) throws IndexOutOfBoundsException
{
try
{
return (ActivityHandle) _hierarchy.elementAt(index);
}
catch (ArrayIndexOutOfBoundsException ex)
{
throw new IndexOutOfBoundsException();
}
}
/**
* @return the current activity in the context.
*/
public ActivityHandle current ()
{
try
{
return (ActivityHandle) _hierarchy.peek();
}
catch (Exception ex)
{
return null;
}
}
/**
* Obtain a copy of this context. Although the context may be shared
* between different threads, the same instance of the context should
* not be.
*
* @return the context copy.
*/
public ActivityHierarchy copy ()
{
return new ActivityHierarchyImple(this);
}
/**
* Overrides Object.equals
*
* Two contexts are equal if both hierarchies are identical.
*/
public boolean equals (Object obj)
{
if (obj != null)
{
if (obj == this)
return true;
else
{
if (obj instanceof ActivityHierarchyImple)
{
ActivityHierarchyImple compare = (ActivityHierarchyImple) obj;
if (_hierarchy.size() == compare._hierarchy.size())
{
for (int i = 0; i < _hierarchy.size(); i++)
{
if (!_hierarchy.elementAt(i).equals(compare._hierarchy.elementAt(i)))
{
return false;
}
}
return true;
}
}
else
return true;
}
}
return false;
}
/**
* 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!
*/
public int hashCode ()
{
return _hierarchy.hashCode();
}
public String toString ()
{
String toReturn = "Activity context:";
if ((_hierarchy == null) || (_hierarchy.size() == 0))
toReturn += " null";
else
{
for (int i = 0; i < _hierarchy.size(); i++)
toReturn += " "+_hierarchy.elementAt(i);
}
return toReturn;
}
protected ActivityHierarchyImple (ActivityHierarchyImple toCopy)
{
_hierarchy = null;
_valid = false;
if (toCopy != null)
{
int copySize = toCopy._hierarchy.size();
if (copySize > 0)
{
_hierarchy = new Stack();
for (int i = 0; i < copySize; i++)
{
/*
* Do we want to create copies of the elements?
*/
_hierarchy.push(toCopy._hierarchy.elementAt(i));
}
_valid = true;
}
}
}
private Stack _hierarchy;
private boolean _valid;
}