/** Return class names form jet sources in given scope which should be visible as Java classes. */
  @NotNull
  @Override
  public PsiClass[] getClassesByName(
      @NotNull @NonNls String name, @NotNull GlobalSearchScope scope) {
    List<PsiClass> result = new ArrayList<PsiClass>();

    IDELightClassGenerationSupport lightClassGenerationSupport =
        IDELightClassGenerationSupport.getInstanceForIDE(project);
    MultiMap<String, FqName> packageClasses =
        lightClassGenerationSupport.getAllPackageClasses(scope);

    // .namespace classes can not be indexed, since they have no explicit declarations
    Collection<FqName> fqNames = packageClasses.get(name);
    if (!fqNames.isEmpty()) {
      for (FqName fqName : fqNames) {
        PsiClass psiClass =
            JavaElementFinder.getInstance(project).findClass(fqName.getFqName(), scope);
        if (psiClass != null) {
          result.add(psiClass);
        }
      }
    }

    // Quick check for classes from getAllClassNames()
    Collection<JetClassOrObject> classOrObjects =
        JetShortClassNameIndex.getInstance().get(name, project, scope);
    if (classOrObjects.isEmpty()) {
      return result.toArray(new PsiClass[result.size()]);
    }

    for (JetClassOrObject classOrObject : classOrObjects) {
      FqName fqName = JetPsiUtil.getFQName(classOrObject);
      if (fqName != null) {
        assert fqName.shortName().getName().equals(name)
            : "A declaration obtained from index has non-matching name:\n"
                + "in index: "
                + name
                + "\n"
                + "declared: "
                + fqName.shortName()
                + "("
                + fqName
                + ")";
        PsiClass psiClass =
            JavaElementFinder.getInstance(project).findClass(fqName.getFqName(), scope);
        if (psiClass != null) {
          result.add(psiClass);
        }
      }
    }

    return result.toArray(new PsiClass[result.size()]);
  }
  /** Return jet class names form jet project sources which should be visible from java. */
  @NotNull
  @Override
  public String[] getAllClassNames() {
    Collection<String> classNames = JetShortClassNameIndex.getInstance().getAllKeys(project);

    // .namespace classes can not be indexed, since they have no explicit declarations
    IDELightClassGenerationSupport lightClassGenerationSupport =
        IDELightClassGenerationSupport.getInstanceForIDE(project);
    Set<String> packageClassShortNames =
        lightClassGenerationSupport
            .getAllPackageClasses(GlobalSearchScope.allScope(project))
            .keySet();
    classNames.addAll(packageClassShortNames);

    return ArrayUtil.toStringArray(classNames);
  }