/**
  * @param ValidatorProviderInterface $validators
  * @param RequestInterpreterInterface $interpreter
  * @param RequestInterface $request
  * @return DocumentValidatorInterface|null
  */
 private function documentAcceptanceValidator(ValidatorProviderInterface $validators, RequestInterpreterInterface $interpreter, RequestInterface $request)
 {
     $resourceType = $request->getResourceType();
     $resourceId = $interpreter->getResourceId();
     $relationshipName = $interpreter->getRelationshipName();
     $record = $request->getRecord();
     /** Create Resource */
     if ($interpreter->isCreateResource()) {
         return $validators->createResource($resourceType);
     } elseif ($interpreter->isUpdateResource()) {
         return $validators->updateResource($resourceType, $resourceId, $record);
     } elseif ($interpreter->isModifyRelationship()) {
         return $validators->modifyRelationship($resourceType, $resourceId, $relationshipName, $record);
     }
     return null;
 }
 /**
  * @inheritdoc
  */
 public function handle(ApiInterface $api, RequestInterface $request)
 {
     $interpreter = $api->getRequestInterpreter();
     $resourceType = $request->getResourceType();
     /** Check the relationship is acceptable */
     if ($request->getRelationshipName()) {
         $this->checkRelationshipName($request);
     }
     /** Check request parameters are acceptable */
     $this->checkQueryParameters($api, $request, $this->filterValidator($resourceType));
     /** Authorize the request */
     if ($this->authorizer) {
         $this->authorize($interpreter, $this->authorizer, $request);
     }
     /** Check the document content is acceptable */
     if ($this->validators) {
         $this->checkDocumentIsAcceptable($this->validators, $interpreter, $request);
     }
 }