HP-1751 added PriceTypeDefinitionInterface::getTariffTypeDefinition() method

Author: VadymHrechukha

src/product/price/PriceTypeDefinition.php

@@ -14,6 +14,7 @@
 use hiqdev\php\billing\product\Domain\Model\Unit\FractionUnitInterface;
 use hiqdev\php\billing\product\Domain\Model\Unit\UnitInterface;
 use hiqdev\php\billing\product\quantity\QuantityFormatterInterface;
+use hiqdev\php\billing\product\TariffTypeDefinitionInterface;
 use hiqdev\php\billing\type\TypeInterface;
 
 /**
@@ -173,4 +174,9 @@ public function getAggregate(): AggregateInterface
 
         return $this->aggregate;
     }
+
+    public function getTariffTypeDefinition(): TariffTypeDefinitionInterface
+    {
+        return $this->parent->end();
+    }
 }

src/product/price/PriceTypeDefinitionInterface.php

@@ -8,6 +8,7 @@
 use hiqdev\php\billing\product\invoice\InvoiceRepresentationCollection;
 use hiqdev\php\billing\product\quantity\FractionQuantityData;
 use hiqdev\php\billing\product\quantity\QuantityFormatterInterface;
+use hiqdev\php\billing\product\TariffTypeDefinitionInterface;
 use hiqdev\php\billing\type\TypeInterface;
 
 interface PriceTypeDefinitionInterface extends HasBehaviorsInterface
@@ -45,4 +46,6 @@ public function getUnit(): UnitInterface;
     public function aggregation(AggregateInterface $aggregate): self;
 
     public function getAggregate(): AggregateInterface;
+
+    public function getTariffTypeDefinition(): TariffTypeDefinitionInterface;
 }