fix code style and structure problems

Author: ngabor84

src/BuilderParamsApplierTrait.php

@@ -38,12 +38,16 @@ public function applyParams(Builder $query, RequestParamsInterface $params): Len
             $query->limit($pagination->getLimit());
             $query->offset($pagination->getPage() * $pagination->getLimit());
 
-            $paginator = $query->paginate($params->getPagination()->getLimit(), ['*'], 'page', $params->getPagination()->getPage());
+            $paginator = $query->paginate(
+                $params->getPagination()->getLimit(),
+                ['*'],
+                'page',
+                $params->getPagination()->getPage()
+            );
         } else {
             $paginator = $query->paginate($query->count(), ['*'], 'page', 1);
         }
 
-
         return $paginator;
     }
 
@@ -55,7 +59,6 @@ protected function applyFilter(Builder $query, Filter $filter): void
         $value = $filter->getValue();
         $method = 'where';
         $clauseOperator = null;
-        $databaseField = null;
 
         switch ($operator) {
             case 'ct':
@@ -67,7 +70,7 @@ protected function applyFilter(Builder $query, Filter $filter): void
                 $clauseOperator = 'NOT LIKE';
                 break;
             case 'sw':
-                $value = $value . '%';
+                $value .= '%';
                 $clauseOperator = 'LIKE';
                 break;
             case 'ew':
@@ -99,9 +102,10 @@ protected function applyFilter(Builder $query, Filter $filter): void
         if ($operator === 'in') {
             $query->whereIn($filter, explode('|', $value));
         } else {
-            call_user_func_array([$query, $method], [
-                $field, $clauseOperator, $value
-            ]);
+            call_user_func_array(
+                [$query, $method],
+                [$field, $clauseOperator, $value]
+            );
         }
     }
 

src/Params/Pagination.php

@@ -7,7 +7,7 @@ class Pagination implements PaginationInterface
     protected $limit;
     protected $page;
 
-    public function __construct(int $limit = null, int $page = null)
+    public function __construct(?int $limit = null, ?int $page = null)
     {
         $this->setLimit($limit);
         $this->setPage($page);

src/RequestQueryParser.php

@@ -32,32 +32,32 @@ public function parse(Request $request): RequestParamsInterface
 
     protected function parseFilters(Request $request): void
     {
-        if ($request->has('filter')) {
-            foreach ($request->get('filter') as $filter) {
-                $filterDatas = explode(':', $filter, 3);
+        $filters = $request->has('filter') ? $request->get('filter') : [];
 
-                if (count($filterDatas) < 3) {
-                    throw new UnprocessableEntityHttpException('Filter must contains field and value!');
-                }
-                list($field, $operator, $value) = $filterDatas;
+        foreach ($filters as $filter) {
+            $filterDatas = explode(':', $filter, 3);
 
-                $this->requestParams->addFilter(new Filter($field, $operator, $value));
+            if (count($filterDatas) < 3) {
+                throw new UnprocessableEntityHttpException('Filter must contains field and value!');
             }
+            [$field, $operator, $value] = $filterDatas;
+
+            $this->requestParams->addFilter(new Filter($field, $operator, $value));
         }
     }
 
     protected function parseSort(Request $request): void
     {
-        if ($request->has('sort')) {
-            foreach ($request->get('sort') as $sort) {
-                list($field, $direction) = explode(':', $sort);
+        $sorts = $request->has('sort') ? $request->get('sort') : [];
 
-                if (empty($field)) {
-                    throw new UnprocessableEntityHttpException('Sort must contains field!');
-                }
+        foreach ($sorts as $sort) {
+            [$field, $direction] = explode(':', $sort);
 
-                $this->requestParams->addSort(new Sort($field, $direction));
+            if ($field === '') {
+                throw new UnprocessableEntityHttpException('Sort must contains field!');
             }
+
+            $this->requestParams->addSort(new Sort($field, $direction));
         }
     }