Added object type-casting handler (fixes #7)

src/TypeCast/Handler/ObjectHandler.php

@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Jasny\MetaCast\TypeCast\Handler;
+
+use Jasny\TypeCast\Handler\ObjectHandler as BaseObjectHandler;
+use Jasny\TypeCast\HandlerInterface;
+use Jasny\MetaCast\MetaCast;
+
+/**
+ * Type cast to an object of a specific class
+ */
+class ObjectHandler extends BaseObjectHandler
+{
+    /**
+     * Instance of MetaCast
+     * @var MetaCast
+     **/
+    protected $metaCast;
+
+    /**
+     * Create class instance
+     *
+     * @param MetaCast $metaCast
+     */
+    public function __construct(MetaCast $metaCast)
+    {
+        $this->metaCast = $metaCast;
+    }
+
+    /**
+     * Create object using __set_state.
+     *
+     * @param mixed $value
+     * @return object|mixed
+     */
+    protected function createWithSetState($value)
+    {
+        $value = $this->metaCast->cast($this->class, $value);
+
+        return parent::createWithSetState($value);
+    }
+}

tests/TypeCast/Handler/ObjectHandlerTest.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace Jasny\MetaCast\Tests\TypeCast\Handler;
+
+use Jasny\MetaCast\MetaCast;
+use Jasny\MetaCast\TypeCast\Handler\ObjectHandler;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers Jasny\MetaCast\TypeCast\Handler\ObjectHandler
+ */
+class ObjectHandlerTest extends TestCase
+{
+    /**
+     * Test 'cast' method in case when __set_state should be used
+     */
+    public function testCast()
+    {
+        $class = $this->getObjectClass();
+        $data = ['x' => 'x_value', 'y' => 'y_value'];
+        $casted = ['x' => 'casted_x_value', 'y' => 'casted_y_value'];
+
+        $metaCast = $this->createMock(MetaCast::class);
+        $metaCast->expects($this->once())->method('cast')->with($class, $data)->willReturn($casted);
+
+        $handler = new ObjectHandler($metaCast);
+        $handler = $handler->forType($class);
+
+        $result = $handler->cast($data);
+
+        $this->assertInstanceOf($class, $result);
+        $this->assertSame($casted['x'], $result->x);
+        $this->assertSame($casted['y'], $result->y);
+    }
+
+    /**
+     * Get target class for casting
+     *
+     * @return string
+     */
+    protected function getObjectClass()
+    {
+        $object = new class() {
+            public $x;
+            public $y;
+
+            public static function __set_state(array $data)
+            {
+                $foobar = new self();
+
+                if (isset($data['x'])) $foobar->x = $data['x'];
+                if (isset($data['y'])) $foobar->y = $data['y'];
+
+                return $foobar;
+            }
+        };
+
+        return get_class($object);
+    }
+}