Update Base_Constant to return the singleton object for same static calls

changelog/update-base-constant-return-same-object-static-call

@@ -0,0 +1,4 @@
+Significance: patch
+Type: dev
+
+Update Base_Constant to return the singleton object for same static calls.

includes/constants/class-base-constant.php

@@ -27,12 +27,19 @@ abstract class Base_Constant implements \JsonSerializable {
 	protected $value;
 
 	/**
-	 * Class constructor.
+	 * Static objects cache.
 	 *
-	 * @param mixed $value Constant from class.
+	 * @var array
+	 */
+	protected static $object_cache = [];
+
+	/**
+	 * Class constructor. Keep it private to only allow initializing from __callStatic()
+	 *
+	 * @param string $value Constant from class.
 	 * @throws \InvalidArgumentException
 	 */
-	public function __construct( $value ) {
+	private function __construct( string $value ) {
 		if ( $value instanceof static ) {
 			$value = $value->get_value();
 		} else {
@@ -61,7 +68,7 @@ public function get_value() {
 	 * @return bool
 	 */
 	final public function equals( $variable = null ): bool {
-		return $variable instanceof Base_Constant && $this->get_value() === $variable->get_value() && static::class === \get_class( $variable );
+		return $this === $variable;
 	}
 
 	/**
@@ -92,7 +99,10 @@ public static function search( string $value ) {
 	 * @throws \InvalidArgumentException
 	 */
 	public static function __callStatic( $name, $arguments ) {
-		return new static( $name );
+		if ( ! isset( static::$object_cache[ $name ] ) ) {
+			static::$object_cache[ $name ] = new static( $name );
+		}
+		return static::$object_cache[ $name ];
 	}
 
 	/**

tests/unit/test-class-base-constant.php

@@ -12,6 +12,11 @@
  */
 class Base_Constant_Test extends WCPAY_UnitTestCase {
 
+	public function test_base_constant_retun_single_object_for_multiple_same_static_calls() {
+		$instance_1 = Payment_Method::BASC();
+		$instance_2 = Payment_Method::BASC();
+		$this->assertTrue( $instance_1 === $instance_2 );
+	}
 	public function test_base_constant_will_create_constant() {
 		$class = Payment_Method::BASC();
 		$this->assertInstanceOf( Payment_Method::class, $class );
@@ -52,4 +57,5 @@ public function test_class_will_throw_exception_if_searched_by_value_that_does_n
 		$this->expectException( \InvalidArgumentException::class );
 		Payment_Method::search( 'foo' );
 	}
+
 }