How to get all Java-Files from a Project without the java files from the dependencies

Hello, I try to get all java Files from the project. I tried this:

FileBasedIndex.getInstance()
.getContainingFiles(
      FileTypeIndex.NAME,
      JavaFileType.INSTANCE,
      GlobalSearchScope.allScope(project))

But I get all java Files also the files from the Dependencies.

How can I get only the Files from the Project without the files from the Dependencies?

kind regards

Chris