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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 fInput;
/**
* 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") { //$NON-NLS-1$
public IStatus runInUIThread(IProgressMonitor monitor) {
fRequestor.viewerInputComplete(ViewerInputUpdate.this);
return Status.OK_STATUS;
}
};
/**
* Constructs a viewer input update request.
*
* @param context presentation context
* @param requestor client making the request
* @param source source from which to derive a viewer input
*/
public ViewerInputUpdate(IPresentationContext context, IViewerInputRequestor requestor, Object source){
fContext = context;
fSource = source;
fRequestor = requestor;
fViewerInputUpdateJob.setSystem(true);
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerInputUpdate#getPresentationContext()
*/
public IPresentationContext getPresentationContext() {
return fContext;
}
/* (non-Javadoc)
* @see org.eclipse.core.runtime.IProgressMonitor#done()
*/
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;
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerInputUpdate#getElement()
*/
public Object getElement() {
return fSource;
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerUpdate#getElementPath()
*/
public TreePath getElementPath() {
return TreePath.EMPTY;
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerInputUpdate#setViewerInput(java.lang.Object)
*/
public void setViewerInput(Object element) {
fInput = element;
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerInputUpdate#getViewerInput()
*/
public Object getViewerInput() {
return fInput;
}
}
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