private static String getRenameKind(IJavaElement e) {
    switch (e.getElementType()) {
      case IJavaElement.COMPILATION_UNIT:
        return IJavaRefactorings.RENAME_COMPILATION_UNIT;

      case IJavaElement.FIELD:
        return IJavaRefactorings.RENAME_FIELD;

      case IJavaElement.LOCAL_VARIABLE:
        return IJavaRefactorings.RENAME_LOCAL_VARIABLE;

      case IJavaElement.METHOD:
        return IJavaRefactorings.RENAME_METHOD;

      case IJavaElement.TYPE:
        return IJavaRefactorings.RENAME_TYPE;

      case IJavaElement.TYPE_PARAMETER:
        return IJavaRefactorings.RENAME_TYPE_PARAMETER;

      case IJavaElement.PACKAGE_FRAGMENT:
        return IJavaRefactorings.RENAME_PACKAGE;

      case IJavaElement.PACKAGE_FRAGMENT_ROOT:
        return IJavaRefactorings.RENAME_PACKAGE;

      default:
        throw new RuntimeException("Unexpected object `" + e.getClass() + "' to rename");
    }
  }
  public JavaRefactoringDescriptor buildEclipseDescriptor() throws Exception {
    System.err.println("[eclipse-rename] Building descriptor...");
    IJavaElement element = location.getIJavaElement();
    String kind = getRenameKind(element);
    // [1] BUGFIX was needed:  The scripting interface didn't allow VariableDeclarationFragments as
    // IJavaElements
    // and thus had to be extended

    // [2] WORKAROUND for scripting interface bug (see below)
    if (kind.equals(IJavaRefactorings.RENAME_METHOD)) {
      IMethod m = (IMethod) element;
      if (m.isConstructor()) {
        // Rename the type instead (as the UI would do-- the scripting interface will only rename
        // the constructor, which is broken)
        kind = IJavaRefactorings.RENAME_TYPE;
        element = m.getDeclaringType();
      }
    }

    System.err.println("[eclipse-rename] Kind = " + kind + ",  element = " + element);

    // [3] Don't test for package fragments now
    if (kind.equals(IJavaRefactorings.RENAME_PACKAGE)) return null; // don't bother with this now

    if (element == null) {
      System.err.println("!!! ABORT: No IJavaElement to represent location");
      throw new RuntimeException("!!! ABORT: No IJavaElement for location");
    }

    if (element instanceof ILocalVariable) {
      System.err.println("element is of type " + element.getClass());
      final ILocalVariable fLocalVariable = (ILocalVariable) element;
      final ISourceRange sourceRange = fLocalVariable.getNameRange();
      final CompilationUnit fCompilationUnitNode = location.getCompilationUnit();
      ASTNode name = NodeFinder.perform(fCompilationUnitNode, sourceRange);
      System.err.println("node is of type " + name.getClass());
      if (name == null) System.err.println("!!! ILV doesn't have associated name!");
      if (name.getParent() instanceof VariableDeclaration)
        System.err.println("ILV has parent : " + (VariableDeclaration) name.getParent());
      else
        System.err.println(
            "!!! ILV doesn't have var declaration parent, instead " + name.getParent().getClass());
    }

    System.err.println("Trying to rename a " + kind + ": " + element);
    if (element instanceof SimpleName)
      System.err.println("  Name = '" + ((SimpleName) element).getIdentifier() + "'");

    if (kind.equals(IJavaRefactorings.RENAME_TYPE)) {
      System.err.println("(Possibly need a new launch configuration)");
      tproject.renameClass((IType) element, new_name);
    }

    final RenameJavaElementDescriptor descriptor =
        (RenameJavaElementDescriptor) getDescriptor(kind);
    descriptor.setJavaElement(element);
    descriptor.setNewName(this.new_name);

    if (element.getElementType() == IJavaElement.TYPE
        || element.getElementType() == IJavaElement.PACKAGE_FRAGMENT)
      descriptor.setUpdateQualifiedNames(true);
    else descriptor.setUpdateQualifiedNames(false);

    descriptor.setUpdateReferences(true);
    descriptor.setDeprecateDelegate(false);
    descriptor.setRenameGetters(false);
    descriptor.setRenameSetters(false);
    descriptor.setKeepOriginal(false);
    descriptor.setUpdateHierarchy(false);
    descriptor.setUpdateSimilarDeclarations(false);

    // [3] Fix:  Eclipse will complain if the transformation is a no-op, but we don't want that:
    if (element.getElementName().equals(this.new_name)) throw new NOPException();

    System.err.println("[eclipse-rename] Computed descriptor.");
    return descriptor;
  }