Bug 109041 [implementation] Occurrence finders should not compute current node each time
I20050906-1200 This is a minor performance improvement item: currently each occurrence finder computes the node at the caret location via NodeFinder. It would be more efficient to compute the node once and initialize each occurrence finder with that node.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
ISourceViewer sourceViewer= getSourceViewer();
			if (sourceViewer == null) {
				fTextOperationAction.run();
				return;
			}
			if (sourceViewer instanceof ITextViewerExtension4)  {
				ITextViewerExtension4 extension4= (ITextViewerExtension4) sourceViewer;
				if (extension4.moveFocusToWidgetToken())
					return;
			}
			if (! (sourceViewer instanceof ITextViewerExtension2)) {
				fTextOperationAction.run();
				return;
			}
			ITextViewerExtension2 textViewerExtension2= (ITextViewerExtension2) sourceViewer;
			
			ITextHover textHover= textViewerExtension2.getCurrentTextHover();
			if (textHover == null) {
				fTextOperationAction.run();
				return;
			}
			Point hoverEventLocation= textViewerExtension2.getHoverEventLocation();
			int offset= computeOffsetAtLocation(sourceViewer, hoverEventLocation.x, hoverEventLocation.y);
			if (offset == -1) {
				fTextOperationAction.run();
				return;
			}
			try {
				
				String contentType= TextUtilities.getContentType(sourceViewer.getDocument(), IJavaPartitions.JAVA_PARTITIONING, offset, true);