/*******************************************************************************
* Copyright (c) 2000, 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.ui;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.application.WorkbenchAdvisor;
import org.eclipse.ui.internal.Workbench;
import org.eclipse.ui.internal.WorkbenchMessages;
import org.eclipse.ui.internal.util.PrefUtil;
import org.eclipse.ui.testing.TestableObject;
/**
* The central class for access to the Eclipse Platform User Interface.
* This class cannot be instantiated; all functionality is provided by
* static methods.
*
* Features provided:
* <ul>
* <li>creation of the workbench.</li>
* <li>access to the workbench.</li>
* </ul>
* <p>
*
* @see IWorkbench
*/
public final class PlatformUI {
/**
* Identifies the workbench plug-in.
*/
public static final String PLUGIN_ID = "org.eclipse.ui"; //$NON-NLS-1$
/**
* Return code (value 0) indicating that the workbench terminated normally.
*
* @see #createAndRunWorkbench
* @since 3.0
*/
public static final int RETURN_OK = 0;
/**
* Return code (value 1) indicating that the workbench was terminated with
* a call to <code>IWorkbench.restart</code>.
*
* @see #createAndRunWorkbench
* @see IWorkbench#restart
* @since 3.0
*/
public static final int RETURN_RESTART = 1;
/**
* Return code (value 2) indicating that the workbench failed to start.
*
* @see #createAndRunWorkbench
* @see IWorkbench#restart
* @since 3.0
*/
public static final int RETURN_UNSTARTABLE = 2;
/**
* Return code (value 3) indicating that the workbench was terminated with
* a call to IWorkbenchConfigurer#emergencyClose.
*
* @see #createAndRunWorkbench
* @since 3.0
*/
public static final int RETURN_EMERGENCY_CLOSE = 3;
/**
* Block instantiation.
*/
private PlatformUI() {
// do nothing
}
/**
* Returns the workbench. Fails if the workbench has not been created yet.
*
* @return the workbench
*/
public static IWorkbench getWorkbench() {
if (Workbench.getInstance() == null) {
// app forgot to call createAndRunWorkbench beforehand
throw new IllegalStateException(WorkbenchMessages.PlatformUI_NoWorkbench);
}
return Workbench.getInstance();
}
/**
* Returns whether {@link #createAndRunWorkbench createAndRunWorkbench} has
* been called to create the workbench, and the workbench has yet to
* terminate.
* <p>
* Note that this method may return <code>true</code> while the workbench
* is still being initialized, so it may not be safe to call workbench API
* methods even if this method returns true. See bug 49316 for details.
* </p>
*
* @return <code>true</code> if the workbench has been created and is
* still running, and <code>false</code> if the workbench has not
* yet been created or has completed
* @since 3.0
*/
public static boolean isWorkbenchRunning() {
return Workbench.getInstance() != null
&& Workbench.getInstance().isRunning();
}
/**
* Creates the workbench and associates it with the given display and workbench
* advisor, and runs the workbench UI. This entails processing and dispatching
* events until the workbench is closed or restarted.
* <p>
* This method is intended to be called by the main class (the "application").
* Fails if the workbench UI has already been created.
* </p>
* <p>
* Use {@link #createDisplay createDisplay} to create the display to pass in.
* </p>
* <p>
* Note that this method is intended to be called by the application
* (<code>org.eclipse.core.boot.IPlatformRunnable</code>). It must be
* called exactly once, and early on before anyone else asks
* <code>getWorkbench()</code> for the workbench.
* </p>
*
* @param display the display to be used for all UI interactions with the workbench
* @param advisor the application-specific advisor that configures and
* specializes the workbench
* @return return code {@link #RETURN_OK RETURN_OK} for normal exit;
* {@link #RETURN_RESTART RETURN_RESTART} if the workbench was terminated
* with a call to {@link IWorkbench#restart IWorkbench.restart};
* {@link #RETURN_UNSTARTABLE RETURN_UNSTARTABLE} if the workbench could
* not be started;
* {@link #RETURN_EMERGENCY_CLOSE RETURN_EMERGENCY_CLOSE} if the UI quit
* because of an emergency; other values reserved for future use
* @since 3.0
*/
public static int createAndRunWorkbench(Display display,
WorkbenchAdvisor advisor) {
return Workbench.createAndRunWorkbench(display, advisor);
}
/**
* Creates the <code>Display</code> to be used by the workbench.
* It is the caller's responsibility to dispose the resulting <code>Display</code>,
* not the workbench's.
*
* @return the display
* @since 3.0
*/
public static Display createDisplay() {
return Workbench.createDisplay();
}
/**
* Returns the testable object facade, for use by the test harness.
* <p>
* IMPORTANT: This method is only for use by the test harness.
* Applications and regular plug-ins should not call this method.
* </p>
*
* @return the testable object facade
* @since 3.0
*/
public static TestableObject getTestableObject() {
return Workbench.getWorkbenchTestable();
}
/**
* Returns the preference store used for publicly settable workbench preferences.
* Constants for these preferences are defined on
* {@link org.eclipse.ui.IWorkbenchPreferenceConstants}.
*
* @return the workbench public preference store
* @since 3.0
*/
public static IPreferenceStore getPreferenceStore() {
return PrefUtil.getAPIPreferenceStore();
}
}
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