Update Validators to extend ABC instead of implementing interface.

app/Models/Validation/Validators/OkValidator.php

@@ -2,9 +2,14 @@
 
 namespace App\Models\Validation\Validators;
 
-use App\Models\Validation\Validators\ValidationInterface;
+use App\Models\Validation\Validators\Validator;
+
+class OkValidator extends Validator {
+    public function isCurrentValid(): bool
+    {
+        return true;
+    }
 
-class OkValidator implements ValidationInterface {
     public function isValid(): bool
     {
         return true;

app/Models/Validation/Validators/UpperRangeValidator.php

@@ -2,15 +2,14 @@
 
 namespace App\Models\Validation\Validators;
 
-use App\Models\Validation\Validators\ValidationInterface;
+use App\Models\Validation\Validators\Validator;
-use App\Models\Validation\Validators\ValidationTrait;
 
-class UpperRangeValidator implements ValidationInterface {
+class UpperRangeValidator extends Validator {
-    private ValidationInterface $nextValidator;
     private int $value;
     private int $rangeLimit;
+    protected Validator $nextValidator;
 
-    public function __construct(int $value, int $rangeLimit, ValidationInterface $nextValidator)
+    public function __construct(int $value, int $rangeLimit, Validator $nextValidator)
     {
         $this->value = $value;
         $this->rangeLimit = $rangeLimit;
@@ -24,10 +23,5 @@ class UpperRangeValidator implements ValidationInterface {
 
         return true;
     }
-
-    public function isValid(): bool
-    {
-        return $this->isCurrentValid() && $this->nextValidator->isValid();
-    }
 }
 

app/Models/Validation/Validators/Validator.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace App\Models\Validation\Validators;
+
+abstract class Validator {
+    abstract public function isCurrentValid(): bool;
+
+    public function isValid(): bool
+    {
+        return $this->isCurrentValid() && $this->nextValidator->isValid();
+    }
+}
+