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/*******************************************************************************
* Copyright (c) 2005, 2011 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
* Pawel Piech - Bug 210023: Another NPE in DefaultWatchExpressionModelProxy
*******************************************************************************/
package org.eclipse.debug.internal.ui.viewers.update;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.debug.core.ILaunch;
import org.eclipse.debug.core.model.IDebugElement;
import org.eclipse.debug.core.model.IWatchExpression;
import org.eclipse.debug.internal.ui.DebugUIPlugin;
import org.eclipse.debug.ui.DebugUITools;
import org.eclipse.debug.ui.contexts.DebugContextEvent;
import org.eclipse.debug.ui.contexts.IDebugContextListener;
import org.eclipse.debug.ui.contexts.IDebugContextService;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.progress.UIJob;
/**
* Model proxy for the expressions view
*
* @see org.eclipse.debug.internal.ui.views.expression.ExpressionView
* @see org.eclipse.debug.internal.ui.model.elements.ExpressionContentProvider
* @see org.eclipse.debug.internal.ui.model.elements.ExpressionsViewMementoProvider
*
* @since 3.2
*/
public class DefaultWatchExpressionModelProxy extends DefaultExpressionModelProxy implements IDebugContextListener {
private IWorkbenchWindow fWindow;
public DefaultWatchExpressionModelProxy(IWatchExpression expression) {
super(expression);
}
@Override
public void installed(final Viewer viewer) {
super.installed(viewer);
UIJob job = new UIJob("install watch expression model proxy") { //$NON-NLS-1$
@Override
public IStatus runInUIThread(IProgressMonitor monitor) {
if (!isDisposed()) {
IWorkbenchWindow[] workbenchWindows = PlatformUI.getWorkbench().getWorkbenchWindows();
for (int i = 0; i < workbenchWindows.length; i++) {
IWorkbenchWindow window = workbenchWindows[i];
// Virtual viewer may have a null control.
Control control = viewer.getControl();
if (control != null && control.getShell().equals(window.getShell())) {
fWindow = window;
break;
}
}
if (fWindow == null) {
fWindow = DebugUIPlugin.getActiveWorkbenchWindow();
}
IDebugContextService contextService = DebugUITools.getDebugContextManager().getContextService(fWindow);
contextService.addDebugContextListener(DefaultWatchExpressionModelProxy.this);
ISelection activeContext = contextService.getActiveContext();
if (activeContext != null) {
contextActivated(activeContext);
}
}
return Status.OK_STATUS;
}
};
job.setSystem(true);
job.schedule();
}
@Override
public synchronized void dispose() {
super.dispose();
if (fWindow != null) {
DebugUITools.getDebugContextManager().getContextService(fWindow).removeDebugContextListener(this);
fWindow = null;
}
}
@Override
protected DebugEventHandler[] createEventHandlers() {
return new DebugEventHandler[]{new ExpressionEventHandler(this)};
}
/**
* Handles the activation of the specified debug context (i.e. the selection)
* @param selection the specified context to 'activate'
*/
protected void contextActivated(ISelection selection) {
if (fWindow != null) {
if (selection instanceof IStructuredSelection) {
IDebugElement context = null;
IStructuredSelection ss = (IStructuredSelection)selection;
if (ss.size() < 2) {
Object object = ss.getFirstElement();
if (object instanceof IDebugElement) {
context= (IDebugElement) object;
} else if (object instanceof ILaunch) {
context= ((ILaunch) object).getDebugTarget();
}
}
IWatchExpression expression = (IWatchExpression)getExpression();
if (expression != null){
expression.setExpressionContext(context);
}
}
}
}
@Override
public void debugContextChanged(DebugContextEvent event) {
if ((event.getFlags() & DebugContextEvent.ACTIVATED) > 0) {
contextActivated(event.getContext());
}
}
}
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