/**
     * Assigns a content type to a content type group.
     *
     * @throws \eZ\Publish\API\Repository\Exceptions\UnauthorizedException if the user is not allowed to unlink a content type
     * @throws \eZ\Publish\API\Repository\Exceptions\InvalidArgumentException If the content type is already assigned the given group
     *
     * @param \eZ\Publish\API\Repository\Values\ContentType\ContentType $contentType
     * @param \eZ\Publish\API\Repository\Values\ContentType\ContentTypeGroup $contentTypeGroup
     */
    public function assignContentTypeGroup( APIContentType $contentType, APIContentTypeGroup $contentTypeGroup )
    {
        if ( $this->repository->hasAccess( 'class', 'update' ) !== true )
            throw new UnauthorizedException( 'ContentType', 'update' );

        $spiContentType = $this->contentTypeHandler->load(
            $contentType->id,
            $contentType->status
        );

        if ( in_array( $contentTypeGroup->id, $spiContentType->groupIds ) )
        {
            throw new InvalidArgumentException(
                "\$contentTypeGroup",
                "The given ContentType is already assigned to the ContentTypeGroup"
            );
        }

        $this->repository->beginTransaction();
        try
        {
            $this->contentTypeHandler->link(
                $contentTypeGroup->id,
                $contentType->id,
                $contentType->status
            );
            $this->repository->commit();
        }
        catch ( Exception $e )
        {
            $this->repository->rollback();
            throw $e;
        }
    }
 /**
  * Link a content type group with a content type
  *
  * @param mixed $groupId
  * @param mixed $contentTypeId
  * @throws \eZ\Publish\API\Repository\Exceptions\NotFoundException If group or type with provided status is not found
  * @throws \eZ\Publish\API\Repository\Exceptions\BadStateException If type is already part of group
  * @todo Above throws are not implemented
  */
 public function link($groupId, $contentTypeId, $status)
 {
     $this->clearCache();
     return $this->innerHandler->link($groupId, $contentTypeId, $status);
 }