private List<PsiClass> getClassesList(String packageName) {
    assertValid();
    ApplicationManager.getApplication().assertReadAccessAllowed();
    List<PsiClass> psiClasses = myPackageToClassesMap.get(packageName);
    if (psiClasses == null) {
      psiClasses = new ArrayList<>();
      myPackageToClassesMap.put(packageName, psiClasses);
    }
    return psiClasses;
  }
private List<PsiClass> getClassesList(String packageName)