Bug 11814 OpenExternalJavadoc action should not call findElement on JAR
This causes an exception: Java Model Exception: Java Model Status [Invalid path: C:/Java/IBM1.3/jre/lib/rt.jar.] at org.eclipse.jdt.internal.core.JavaProject.findElement(JavaProject.java:435) at org.eclipse.jdt.internal.ui.actions.OpenExternalJavadocAction.run(OpenExternalJavadocAction.java:102) at org.eclipse.ui.texteditor.RetargetTextEditorAction.run(RetargetTextEditorAction.java:103) at org.eclipse.jface.action.Action.runWithEvent(Action.java:473) at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:407) at org.eclipse.jface.action.ActionContributionItem.handleWidgetEvent(ActionContributionItem.java(Compiled Code)) at org.eclipse.jface.action.ActionContributionItem$ActionListener.handleEvent(ActionContributionItem.java(Compiled Code)) at org.eclipse.jface.action.ActionContributionItem$ActionListener.handleEvent(ActionContributionItem.java(Compiled Code)) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java(Compiled Code)) at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java(Compiled Code)) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java(Compiled Code)) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java(Compiled Code)) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java(Compiled Code)) at org.eclipse.ui.internal.Workbench.run(Workbench.java:698) at org.eclipse.core.internal.boot.InternalBootLoader.run(InternalBootLoader.java:777) at org.eclipse.core.boot.BootLoader.run(BootLoader.java:319) at java.lang.reflect.Method.invoke(Native Method) at org.eclipse.core.launcher.Main.basicRun(Main.java:196) at org.eclipse.core.launcher.Main.run(Main.java:555) at org.eclipse.core.launcher.UIMain.main(UIMain.java:52) 4 org.eclipse.jdt.core 979 Invalid path: C:/Java/IBM1.3/jre/lib/rt.jar.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/actions/OpenExternalJavadocAction.java
setText("Open E&xternal Javadoc@Shift+F2");
		setDescription("Opens the Javadoc of the selected element in an external browser");
		setToolTipText("Opens the Javadoc of the selected element in an external browser");
		fSelectionProvider= provider;
	}
	
	public void update() {
		setEnabled(canOperateOn());
	}
	
	private boolean canOperateOn() {
		if (fSelectionProvider != null) {
			IStructuredSelection selection= fSelectionProvider.getSelection(StructuredSelectionProvider.FLAGS_GET_EDITOR_INPUT);
			return selection.size() == 1;
		}
		return false;
	}
	
	private Object getSelectedElement() {
		if (fSelectionProvider == null) {
			return null;
		}
		
		IStructuredSelection selection= fSelectionProvider.getSelection(StructuredSelectionProvider.FLAGS_DO_CODERESOLVE | StructuredSelectionProvider.FLAGS_GET_EDITOR_INPUT);
		if (selection.size() != 1)
			return null;
			
		return selection.getFirstElement();
	}