protected final void registerVariableError(@NotNull PsiVariable variable, Object... infos) {
   final PsiElement nameIdentifier = variable.getNameIdentifier();
   if (nameIdentifier == null) {
     registerError(variable, infos);
   } else {
     registerError(nameIdentifier, infos);
   }
 }
  public static Set<String> suggestExpressionOfType(
      final PsiClassType type, final PsiLiteralExpression context) {
    PsiVariable[] variables = MacroUtil.getVariablesVisibleAt(context, "");
    Set<String> result = new LinkedHashSet<String>();
    for (PsiVariable var : variables) {
      PsiType varType = var.getType();
      if (type == null || type.isAssignableFrom(varType)) {
        result.add(var.getNameIdentifier().getText());
      }
    }

    PsiExpression[] expressions = MacroUtil.getStandardExpressionsOfType(context, type);
    for (PsiExpression expression : expressions) {
      result.add(expression.getText());
    }
    if (type != null) {
      addAvailableMethodsOfType(type, context, result);
    }
    return result;
  }
  @Override
  protected void invokeImpl(final PsiClass targetClass) {
    if (CreateFromUsageUtils.isValidReference(myReferenceExpression, true)) {
      return;
    }

    final Project project = myReferenceExpression.getProject();
    PsiElementFactory factory = JavaPsiFacade.getInstance(project).getElementFactory();

    final PsiFile targetFile = targetClass.getContainingFile();

    PsiType[] expectedTypes = CreateFromUsageUtils.guessType(myReferenceExpression, false);
    PsiType type = expectedTypes[0];

    String varName = myReferenceExpression.getReferenceName();
    PsiExpression initializer = null;
    boolean isInline = false;
    PsiExpression[] expressions =
        CreateFromUsageUtils.collectExpressions(
            myReferenceExpression, PsiMember.class, PsiFile.class);
    PsiStatement anchor = getAnchor(expressions);
    if (anchor instanceof PsiExpressionStatement
        && ((PsiExpressionStatement) anchor).getExpression() instanceof PsiAssignmentExpression) {
      PsiAssignmentExpression assignment =
          (PsiAssignmentExpression) ((PsiExpressionStatement) anchor).getExpression();
      if (assignment.getLExpression().textMatches(myReferenceExpression)) {
        initializer = assignment.getRExpression();
        isInline = true;
      }
    }

    PsiDeclarationStatement decl =
        factory.createVariableDeclarationStatement(varName, type, initializer);

    TypeExpression expression = new TypeExpression(project, expectedTypes);

    if (isInline) {
      final PsiExpression expr = ((PsiExpressionStatement) anchor).getExpression();
      final PsiElement semicolon = expr.getNextSibling();
      if (semicolon != null) {
        final PsiElement nextSibling = semicolon.getNextSibling();
        if (nextSibling != null) {
          decl.addRange(nextSibling, anchor.getLastChild());
        }
      }
      decl = (PsiDeclarationStatement) anchor.replace(decl);
    } else {
      decl = (PsiDeclarationStatement) anchor.getParent().addBefore(decl, anchor);
    }

    PsiVariable var = (PsiVariable) decl.getDeclaredElements()[0];
    boolean isFinal =
        CodeStyleSettingsManager.getSettings(project).GENERATE_FINAL_LOCALS
            && !CreateFromUsageUtils.isAccessedForWriting(expressions);
    PsiUtil.setModifierProperty(var, PsiModifier.FINAL, isFinal);

    var = CodeInsightUtilBase.forcePsiPostprocessAndRestoreElement(var);
    if (var == null) return;
    TemplateBuilderImpl builder = new TemplateBuilderImpl(var);
    builder.replaceElement(var.getTypeElement(), expression);
    builder.setEndVariableAfter(var.getNameIdentifier());
    Template template = builder.buildTemplate();

    final Editor newEditor = positionCursor(project, targetFile, var);
    TextRange range = var.getTextRange();
    newEditor.getDocument().deleteString(range.getStartOffset(), range.getEndOffset());

    startTemplate(
        newEditor,
        template,
        project,
        new TemplateEditingAdapter() {
          @Override
          public void templateFinished(Template template, boolean brokenOff) {
            PsiDocumentManager.getInstance(project).commitDocument(newEditor.getDocument());
            final int offset = newEditor.getCaretModel().getOffset();
            final PsiLocalVariable localVariable =
                PsiTreeUtil.findElementOfClassAtOffset(
                    targetFile, offset, PsiLocalVariable.class, false);
            if (localVariable != null) {
              ApplicationManager.getApplication()
                  .runWriteAction(
                      new Runnable() {
                        @Override
                        public void run() {
                          CodeStyleManager.getInstance(project).reformat(localVariable);
                        }
                      });
            }
          }
        });
  }