| /******************************************************************************* |
| * Copyright (c) 2003, 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 - Initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ui.progress; |
| |
| 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.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 |
| */ |
| public abstract class UIJob 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 thier display at runtime. |
| * |
| * @param name |
| * the job name |
| * |
| */ |
| public UIJob(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 UIJob(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. |
| */ |
| 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() { |
| public void run() { |
| IStatus result = 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); |
| } |
| |
| } finally { |
| UIStats.end(UIStats.UI_JOB, UIJob.this, getName()); |
| if (result == null) { |
| result = new Status(IStatus.ERROR, |
| PlatformUI.PLUGIN_ID, IStatus.ERROR, |
| ProgressMessages.Error, |
| null); |
| } |
| 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 avaialble via PlatformUI.isWorkbenchRunning(). |
| * |
| * @param runDisplay |
| * Display |
| * @see UIJob#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 && PlatformUI.isWorkbenchRunning()) { |
| return PlatformUI.getWorkbench().getDisplay(); |
| } |
| return cachedDisplay; |
| } |
| } |