/*******************************************************************************
* Copyright (c) 2005, 2006 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.internal.ui.viewers;
/**
* An update policy updates a viewer based on deltas reported by a model proxy.
*
* @since 3.2
*
*/
public abstract class AbstractUpdatePolicy {
private AsynchronousViewer fViewer = null;
/* (non-Javadoc)
* @see org.eclipse.debug.ui.viewers.IUpdatePolicy#init(org.eclipse.debug.ui.viewers.update.IPresentation)
*/
public void init(AsynchronousViewer viewer) {
fViewer = viewer;
}
/* (non-Javadoc)
* @see org.eclipse.debug.ui.viewers.IUpdatePolicy#dispose()
*/
public synchronized void dispose() {
fViewer = null;
}
/**
* Returns the viewer this policy is installed on or <code>null</code>
* if disposed.
*
* @return presentation to update
*/
public AsynchronousViewer getViewer() {
return fViewer;
}
protected synchronized boolean isDisposed() {
return fViewer == null;
}
}