docs: private boolean ensureAntScriptFileIsValid(File antScriptFile) {
  		if (antScriptFile.exists() && antScriptFile.isDirectory() && fAntScriptNamesCombo.getText().length() > 0) {
  			setErrorMessage(FatJarPackagerMessages.FatJarPackageWizardPage_error_antScriptLocationIsDir);
  			fAntScriptNamesCombo.setFocus();
  			return false;
  		}
  		if (antScriptFile.exists()) {
  			if (!antScriptFile.canWrite()) {
  				setErrorMessage(FatJarPackagerMessages.FatJarPackageWizardPage_error_antScriptLocationUnwritable);
  				fAntScriptNamesCombo.setFocus();
  				return false;
  			}
  		}
  		return true;
  	}