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/*******************************************************************************
* Copyright (c) 2005, 2013 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.internal.ui.viewers.model;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.debug.internal.core.commands.Request;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerInputRequestor;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerInputUpdate;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.ui.progress.WorkbenchJob;
/**
* Internal implementation of the {@link IViewerInputUpdate} interface. Allows
* implementors to translate the active debug context into an appropriate viewer
* input.
*
* @since 3.4
* @see IViewerInputUpdate
*/
public class ViewerInputUpdate extends Request implements IViewerInputUpdate {
/**
* Presentation context
*/
private IPresentationContext fContext;
/**
* New viewer input
*/
private Object fSource;
/**
* Whether this update is done
*/
private boolean fDone;
/**
* Viewer input to use
*/
private Object fInputElement;
/**
* Viewer input at the time the request was made
*/
private Object fViewerInput;
/**
* Client making request
*/
private IViewerInputRequestor fRequestor;
/**
* When <code>done()</code> is called, the viewer must be informed that the update is complete in the UI thread.
*/
protected WorkbenchJob fViewerInputUpdateJob = new WorkbenchJob("Asynchronous viewer input update") { //$NON-NLS-1$
@Override
public IStatus runInUIThread(IProgressMonitor monitor) {
if (ViewerInputUpdate.this.isCanceled()){
return Status.CANCEL_STATUS;
}
fRequestor.viewerInputComplete(ViewerInputUpdate.this);
return Status.OK_STATUS;
}
};
/**
* Constructs a viewer input update request.
*
* @param context presentation context
* @param viewerInput viewer input at the time the request was made
* @param requestor client making the request
* @param source source from which to derive a viewer input
*/
public ViewerInputUpdate(IPresentationContext context, Object viewerInput, IViewerInputRequestor requestor, Object source){
fContext = context;
fSource = source;
fRequestor = requestor;
fViewerInputUpdateJob.setSystem(true);
fViewerInput = viewerInput;
}
@Override
public IPresentationContext getPresentationContext() {
return fContext;
}
@Override
public final void done() {
synchronized (this) {
if (isDone()) {
return;
}
fDone = true;
}
fViewerInputUpdateJob.schedule();
}
/**
* Returns whether this request is done yet.
*
* @return whether this request is done yet
*/
protected synchronized boolean isDone() {
return fDone;
}
@Override
public Object getElement() {
return fSource;
}
@Override
public TreePath getElementPath() {
return TreePath.EMPTY;
}
@Override
public void setInputElement(Object element) {
fInputElement = element;
}
@Override
public Object getInputElement() {
return fInputElement;
}
@Override
public Object getViewerInput() {
return fViewerInput;
}
}
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