Bug 101625 NPE when cancelling Call Hierachy search
In I20050624-0010. 1) Start a Call Hierarchy query that is likely to take a long time (for example, on SomeClass.toString()). 2) Try to cancel the search before it completes. The search is not cancelled, and the following is written to the error log: java.lang.NullPointerException at org.eclipse.ui.progress.DeferredTreeContentManager$1.isParent(DeferredTreeContentManager.java:225) at org.eclipse.ui.progress.DeferredTreeContentManager$1.belongsTo(DeferredTreeContentManager.java:206) at org.eclipse.core.internal.jobs.JobManager.select(JobManager.java:876) at org.eclipse.core.internal.jobs.JobManager.select(JobManager.java:898) at org.eclipse.core.internal.jobs.JobManager.select(JobManager.java:886) at org.eclipse.core.internal.jobs.JobManager.cancel(JobManager.java:229) at org.eclipse.ui.progress.DeferredTreeContentManager.cancel(DeferredTreeContentManager.java:365) at org.eclipse.jdt.internal.ui.callhierarchy.CallHierarchyContentProvider.cancelJobs(CallHierarchyContentProvider.java:171) at org.eclipse.jdt.internal.ui.callhierarchy.CallHierarchyViewer.cancelJobs(CallHierarchyViewer.java:129) at org.eclipse.jdt.internal.ui.callhierarchy.CallHierarchyViewPart.cancelJobs(CallHierarchyViewPart.java:922) at org.eclipse.jdt.internal.ui.callhierarchy.CancelSearchAction.run(CancelSearchAction.java:37) at org.eclipse.jface.action.Action.runWithEvent(Action.java:996) at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:538) at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:488) at org.eclipse.jface.action.ActionContributionItem$6.handleEvent(ActionContributionItem.java:441) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:843) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3080) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2713) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1699) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1663) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:367) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143) at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:103) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:226) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:376) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:163) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.eclipse.core.launcher.Main.invokeFramework(Main.java:334) at org.eclipse.core.launcher.Main.basicRun(Main.java:278) at org.eclipse.core.launcher.Main.run(Main.java:973) at org.eclipse.core.launcher.Main.main(Main.java:948)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/callhierarchy/CallHierarchyViewPart.java
IStatusLineManager slManager = getViewSite().getActionBars().getStatusLineManager();
        fSelectionProviderMediator.addSelectionChangedListener(new StatusBarUpdater(slManager));
        getSite().setSelectionProvider(fSelectionProviderMediator);
        fClipboard= new Clipboard(parent.getDisplay());
        
        makeActions();
        fillViewMenu();
        fillActionBars();
        initOrientation();
        initCallMode();
        if (fMemento != null) {
            restoreState(fMemento);
        }
		restoreSplitterRatio();
		addPartListener();
   }
	private void restoreSplitterRatio() {
		String ratio= fDialogSettings.get(DIALOGSTORE_RATIO + fCurrentOrientation);
		if (ratio == null)
			return;
		int intRatio= Integer.parseInt(ratio);
        fHierarchyLocationSplitter.setWeights(new int[] {intRatio, 1000 - intRatio});
	}
	private void saveSplitterRatio() {
		if (fHierarchyLocationSplitter != null && ! fHierarchyLocationSplitter.isDisposed()) {
	        int[] weigths = fHierarchyLocationSplitter.getWeights();
	        int ratio = (weigths[0] * 1000) / (weigths[0] + weigths[1]);
			String key= DIALOGSTORE_RATIO + fCurrentOrientation;
	        fDialogSettings.put(key, ratio);
		}