@Override
    protected void addCompletions(
        @NotNull CompletionParameters parameters,
        ProcessingContext processingContext,
        @NotNull CompletionResultSet completionResultSet) {

      PsiElement position = parameters.getPosition();
      if (!Symfony2ProjectComponent.isEnabled(position)) {
        return;
      }

      PsiElement prevSiblingOfType =
          PsiElementUtils.getPrevSiblingOfType(
              position, YamlElementPatternHelper.getPreviousCommaSibling());
      if (prevSiblingOfType == null) {
        return;
      }

      String service = PsiElementUtils.trimQuote(prevSiblingOfType.getText());
      if (StringUtils.isBlank(service)) {
        return;
      }

      PhpClass phpClass = ServiceUtil.getServiceClass(prevSiblingOfType.getProject(), service);
      if (phpClass == null) {
        return;
      }

      for (Method method : phpClass.getMethods()) {
        if (method.getAccess().isPublic() && !(method.getName().startsWith("__"))) {
          completionResultSet.addElement(new PhpLookupElement(method));
        }
      }
    }