package org.eclipse.nebula.widgets.xviewer.util.internal;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.nebula.widgets.xviewer.util.XViewerDisplay;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.internal.WorkbenchPlugin;
import org.eclipse.ui.internal.misc.UIStats;
import org.eclipse.ui.internal.progress.ProgressMessages;
/**
* The UIJob is a Job that runs within the UI Thread via an asyncExec.
*
* @since 3.0
*/
@SuppressWarnings("restriction")
public abstract class XViewerUIJob extends Job {
private Display cachedDisplay;
/**
* Create a new instance of the receiver with the supplied name. The display used will be the one from the workbench
* if this is available. UIJobs with this constructor will determine their display at runtime.
*
* @param name the job name
*/
public XViewerUIJob(String name) {
super(name);
}
/**
* Create a new instance of the receiver with the supplied Display.
*
* @param jobDisplay the display
* @param name the job name
* @see Job
*/
public XViewerUIJob(Display jobDisplay, String name) {
this(name);
setDisplay(jobDisplay);
}
/**
* Convenience method to return a status for an exception.
*
* @param exception
* @return IStatus an error status built from the exception
* @see Job
*/
public static IStatus errorStatus(Throwable exception) {
return WorkbenchPlugin.getStatus(exception);
}
/**
* @see org.eclipse.core.runtime.jobs.Job#run(org.eclipse.core.runtime.IProgressMonitor) Note: this message is marked
* final. Implementors should use runInUIThread() instead.
*/
@Override
public final IStatus run(final IProgressMonitor monitor) {
if (monitor.isCanceled()) {
return Status.CANCEL_STATUS;
}
Display asyncDisplay = getDisplay();
if (asyncDisplay == null || asyncDisplay.isDisposed()) {
return Status.CANCEL_STATUS;
}
asyncDisplay.asyncExec(new Runnable() {
@Override
public void run() {
IStatus result = null;
Throwable throwable = null;
try {
//As we are in the UI Thread we can
//always know what to tell the job.
setThread(Thread.currentThread());
if (monitor.isCanceled()) {
result = Status.CANCEL_STATUS;
} else {
UIStats.start(UIStats.UI_JOB, getName());
result = runInUIThread(monitor);
}
} catch (Throwable t) {
throwable = t;
} finally {
UIStats.end(UIStats.UI_JOB, XViewerUIJob.this, getName());
if (result == null) {
result =
new Status(IStatus.ERROR, PlatformUI.PLUGIN_ID, IStatus.ERROR, ProgressMessages.InternalError,
throwable);
}
done(result);
}
}
});
return Job.ASYNC_FINISH;
}
/**
* Run the job in the UI Thread.
*
* @param monitor
* @return IStatus
*/
public abstract IStatus runInUIThread(IProgressMonitor monitor);
/**
* Sets the display to execute the asyncExec in. Generally this is not' used if there is a valid display available
* via PlatformUI.isWorkbenchRunning().
*
* @param runDisplay Display
* @see XViewerUIJob#getDisplay()
* @see PlatformUI#isWorkbenchRunning()
*/
public void setDisplay(Display runDisplay) {
Assert.isNotNull(runDisplay);
cachedDisplay = runDisplay;
}
/**
* Returns the display for use by the receiver when running in an asyncExec. If it is not set then the display set in
* the workbench is used. If the display is null the job will not be run.
*
* @return Display or <code>null</code>.
*/
public Display getDisplay() {
//If it was not set get it from the workbench
if (cachedDisplay == null) {
cachedDisplay = XViewerDisplay.getDisplay();
}
return cachedDisplay;
}
}