String newCuName= newText + ".java";
String newCuName= JavaModelUtil.getRenamedCUName(cu, newText);
			public String isValid(String newText) {				if (newText == null || "".equals(newText)) //$NON-NLS-1$					return INVALID_NAME_NO_MESSAGE;				String newCuName= newText + ".java"; //$NON-NLS-1$				IStatus status= JavaConventions.validateCompilationUnitName(newCuName);					if (status.getSeverity() == IStatus.ERROR)					return status.getMessage();				RefactoringStatus refStatus;				refStatus= Checks.checkCompilationUnitNewName(cu, newText);				if (refStatus.hasFatalError())					return refStatus.getMessageMatchingSeverity(RefactoringStatus.FATAL);				if (cu.getElementName().equalsIgnoreCase(newCuName))					return ReorgMessages.ReorgQueries_resourceExistsWithDifferentCaseMassage; 								return null;				}