public static void checkCreateClassOrInterface(@NotNull PsiDirectory directory, String name)
throws IncorrectOperationException {
PsiUtil.checkIsIdentifier(directory.getManager(), name);
String fileName = name + "." + StdFileTypes.JAVA.getDefaultExtension();
directory.checkCreateFile(fileName);
PsiNameHelper helper = JavaPsiFacade.getInstance(directory.getProject()).getNameHelper();
PsiPackage aPackage = JavaDirectoryService.getInstance().getPackage(directory);
String qualifiedName = aPackage == null ? null : aPackage.getQualifiedName();
if (!StringUtil.isEmpty(qualifiedName) && !helper.isQualifiedName(qualifiedName)) {
throw new IncorrectOperationException(
"Cannot create class in invalid package: '" + qualifiedName + "'");
}
}
