feat: add enum casting

system/DataCaster/Cast/EnumCast.php

@@ -0,0 +1,126 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <[email protected]>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\DataCaster\Cast;
+
+use BackedEnum;
+use CodeIgniter\DataCaster\Exceptions\CastException;
+use ReflectionEnum;
+use UnitEnum;
+
+/**
+ * Class EnumCast
+ *
+ * Handles casting for PHP enums (both backed and unit enums)
+ *
+ * (PHP) [enum --> value/name] --> (DB driver) --> (DB column) int|string
+ *       [     <-- value/name] <-- (DB driver) <-- (DB column) int|string
+ */
+class EnumCast extends BaseCast implements CastInterface
+{
+    /**
+     * @param array<int, string> $params
+     */
+    public static function get(
+        mixed $value,
+        array $params = [],
+        ?object $helper = null,
+    ): mixed {
+        if (! is_string($value) && ! is_int($value)) {
+            self::invalidTypeValueError($value);
+        }
+
+        $enumClass = $params[0] ?? null;
+
+        if ($enumClass === null) {
+            throw CastException::forMissingEnumClass();
+        }
+
+        if (! enum_exists($enumClass)) {
+            throw CastException::forNotEnum($enumClass);
+        }
+
+        $reflection = new ReflectionEnum($enumClass);
+
+        // Unit enum
+        if (! $reflection->isBacked()) {
+            // Unit enum - match by name
+            foreach ($enumClass::cases() as $case) {
+                if ($case->name === $value) {
+                    return $case;
+                }
+            }
+
+            throw CastException::forInvalidEnumCaseName($enumClass, $value);
+        }
+
+        // Backed enum - validate and cast the value to proper type
+        $backingType = $reflection->getBackingType();
+
+        // Cast to proper type (int or string)
+        if ($backingType->getName() === 'int') {
+            $value = (int) $value;
+        } elseif ($backingType->getName() === 'string') {
+            $value = (string) $value;
+        }
+
+        $enum = $enumClass::tryFrom($value);
+
+        if ($enum === null) {
+            throw CastException::forInvalidEnumValue($enumClass, $value);
+        }
+
+        return $enum;
+    }
+
+    /**
+     * @param array<int, string> $params
+     */
+    public static function set(
+        mixed $value,
+        array $params = [],
+        ?object $helper = null,
+    ): int|string {
+        if (! is_object($value) || ! enum_exists($value::class)) {
+            self::invalidTypeValueError($value);
+        }
+
+        // Get the expected enum class
+        $enumClass = $params[0] ?? null;
+
+        if ($enumClass === null) {
+            throw CastException::forMissingEnumClass();
+        }
+
+        if (! enum_exists($enumClass)) {
+            throw CastException::forNotEnum($enumClass);
+        }
+
+        // Validate that the enum is of the expected type
+        if (! $value instanceof $enumClass) {
+            throw CastException::forInvalidEnumType($enumClass, $value::class);
+        }
+
+        $reflection = new ReflectionEnum($value::class);
+
+        // Backed enum - return the properly typed backing value
+        if ($reflection->isBacked()) {
+            /** @var BackedEnum $value */
+            return $value->value;
+        }
+
+        // Unit enum - return the case name
+        /** @var UnitEnum $value */
+        return $value->name;
+    }
+}

system/DataCaster/DataCaster.php

@@ -18,6 +18,7 @@
 use CodeIgniter\DataCaster\Cast\CastInterface;
 use CodeIgniter\DataCaster\Cast\CSVCast;
 use CodeIgniter\DataCaster\Cast\DatetimeCast;
+use CodeIgniter\DataCaster\Cast\EnumCast;
 use CodeIgniter\DataCaster\Cast\FloatCast;
 use CodeIgniter\DataCaster\Cast\IntBoolCast;
 use CodeIgniter\DataCaster\Cast\IntegerCast;
@@ -48,6 +49,7 @@ final class DataCaster
         'boolean'   => BooleanCast::class,
         'csv'       => CSVCast::class,
         'datetime'  => DatetimeCast::class,
+        'enum'      => EnumCast::class,
         'double'    => FloatCast::class,
         'float'     => FloatCast::class,
         'int'       => IntegerCast::class,

system/Entity/Cast/BaseCast.php

@@ -18,27 +18,11 @@
  */
 abstract class BaseCast implements CastInterface
 {
-    /**
-     * Get
-     *
-     * @param array|bool|float|int|object|string|null $value  Data
-     * @param array                                   $params Additional param
-     *
-     * @return array|bool|float|int|object|string|null
-     */
     public static function get($value, array $params = [])
     {
         return $value;
     }
 
-    /**
-     * Set
-     *
-     * @param array|bool|float|int|object|string|null $value  Data
-     * @param array                                   $params Additional param
-     *
-     * @return array|bool|float|int|object|string|null
-     */
     public static function set($value, array $params = [])
     {
         return $value;

system/Entity/Cast/CastInterface.php

@@ -26,7 +26,7 @@ interface CastInterface
      * Takes a raw value from Entity, returns its value for PHP.
      *
      * @param array|bool|float|int|object|string|null $value  Data
-     * @param array                                   $params Additional param
+     * @param array<int, string>                      $params Additional param
      *
      * @return array|bool|float|int|object|string|null
      */
@@ -36,7 +36,7 @@ public static function get($value, array $params = []);
      * Takes a PHP value, returns its raw value for Entity.
      *
      * @param array|bool|float|int|object|string|null $value  Data
-     * @param array                                   $params Additional param
+     * @param array<int, string>                      $params Additional param
      *
      * @return array|bool|float|int|object|string|null
      */

system/Entity/Cast/EnumCast.php

@@ -0,0 +1,142 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <[email protected]>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Entity\Cast;
+
+use BackedEnum;
+use CodeIgniter\Entity\Exceptions\CastException;
+use ReflectionEnum;
+use UnitEnum;
+
+/**
+ * Class EnumCast
+ *
+ * Handles casting for PHP enums (both backed and unit enums)
+ */
+class EnumCast extends BaseCast
+{
+    /**
+     * {@inheritDoc}
+     */
+    public static function get($value, array $params = [])
+    {
+        $enumClass = $params[0] ?? null;
+
+        if ($enumClass === null) {
+            throw CastException::forMissingEnumClass();
+        }
+
+        if (! enum_exists($enumClass)) {
+            throw CastException::forNotEnum($enumClass);
+        }
+
+        $reflection = new ReflectionEnum($enumClass);
+
+        // Backed enum - validate and cast the value to proper type
+        if ($reflection->isBacked()) {
+            $backingType = $reflection->getBackingType();
+
+            // Cast to proper type (int or string)
+            if ($backingType->getName() === 'int') {
+                $value = (int) $value;
+            } elseif ($backingType->getName() === 'string') {
+                $value = (string) $value;
+            }
+
+            $enum = $enumClass::tryFrom($value);
+
+            if ($enum === null) {
+                throw CastException::forInvalidEnumValue($enumClass, $value);
+            }
+
+            return $enum;
+        }
+
+        // Unit enum - match by name
+        foreach ($enumClass::cases() as $case) {
+            if ($case->name === $value) {
+                return $case;
+            }
+        }
+
+        throw CastException::forInvalidEnumCaseName($enumClass, $value);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public static function set($value, array $params = []): int|string|null
+    {
+        // Get the expected enum class
+        $enumClass = $params[0] ?? null;
+
+        if ($enumClass === null) {
+            throw CastException::forMissingEnumClass();
+        }
+
+        if (! enum_exists($enumClass)) {
+            throw CastException::forNotEnum($enumClass);
+        }
+
+        // If it's already an enum object, validate and extract its value
+        if (is_object($value) && enum_exists($value::class)) {
+            // Validate that the enum is of the expected type
+            if (! $value instanceof $enumClass) {
+                throw CastException::forInvalidEnumType($enumClass, $value::class);
+            }
+
+            $reflection = new ReflectionEnum($value::class);
+
+            // Backed enum - return the properly typed backing value
+            if ($reflection->isBacked()) {
+                /** @var BackedEnum $value */
+                return $value->value;
+            }
+
+            // Unit enum - return the case name
+            /** @var UnitEnum $value */
+            return $value->name;
+        }
+
+        $reflection = new ReflectionEnum($enumClass);
+
+        // Validate backed enum values
+        if ($reflection->isBacked()) {
+            $backingType = $reflection->getBackingType();
+
+            // Cast to proper type (int or string)
+            if ($backingType->getName() === 'int') {
+                $value = (int) $value;
+            } elseif ($backingType->getName() === 'string') {
+                $value = (string) $value;
+            }
+
+            if ($enumClass::tryFrom($value) === null) {
+                throw CastException::forInvalidEnumValue($enumClass, $value);
+            }
+
+            return $value;
+        }
+
+        // Validate unit enum case names - must be a string
+        $value = (string) $value;
+
+        foreach ($enumClass::cases() as $case) {
+            if ($case->name === $value) {
+                return $value;
+            }
+        }
+
+        throw CastException::forInvalidEnumCaseName($enumClass, $value);
+    }
+}

system/Entity/Entity.php

@@ -18,6 +18,7 @@
 use CodeIgniter\Entity\Cast\BooleanCast;
 use CodeIgniter\Entity\Cast\CSVCast;
 use CodeIgniter\Entity\Cast\DatetimeCast;
+use CodeIgniter\Entity\Cast\EnumCast;
 use CodeIgniter\Entity\Cast\FloatCast;
 use CodeIgniter\Entity\Cast\IntBoolCast;
 use CodeIgniter\Entity\Cast\IntegerCast;
@@ -92,6 +93,7 @@ class Entity implements JsonSerializable
         'csv'       => CSVCast::class,
         'datetime'  => DatetimeCast::class,
         'double'    => FloatCast::class,
+        'enum'      => EnumCast::class,
         'float'     => FloatCast::class,
         'int'       => IntegerCast::class,
         'integer'   => IntegerCast::class,