Bug 15527 JavaCore constants should be used is favor of hard-coded strings
the following classes should use constants defined in JavaCode rather than hard-coded strings StubUtility CodeFormatterUtil CompilationUnitEditor JavaCodeScanner JavaCompiletionProcessor
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitEditor.java
AdaptedSourceViewer asv= (AdaptedSourceViewer) getSourceViewer();
			asv.addTextConverter(fTabConverter);
		}
	}
	
	private void stopTabConversion() {
		if (fTabConverter != null) {
			AdaptedSourceViewer asv= (AdaptedSourceViewer) getSourceViewer();
			asv.removeTextConverter(fTabConverter);
			fTabConverter= null;
		}
	}
	
	private boolean isTabConversionEnabled() {
		IPreferenceStore store= getPreferenceStore();
		return store.getBoolean(SPACES_FOR_TABS);
	}
	
	private void showOverviewRuler() {
		AdaptedSourceViewer asv= (AdaptedSourceViewer) getSourceViewer();
		asv.showOverviewRuler();
	}
	
	private void hideOverviewRuler() {
		AdaptedSourceViewer asv= (AdaptedSourceViewer) getSourceViewer();
		asv.hideOverviewRuler();
	}
	
	private boolean isOverviewRulerVisible() {
		IPreferenceStore store= getPreferenceStore();