Add HandlerUnpacker

src/pjdietz/WellRESTed/HandlerUnpacker.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace pjdietz\WellRESTed;
+
+use pjdietz\WellRESTed\Interfaces\HandlerInterface;
+
+class HandlerUnpacker
+{
+    public function unpack($handler)
+    {
+        if (is_callable($handler)) {
+            $handler = $handler();
+        } elseif (is_string($handler)) {
+            $handler = new $handler();
+        }
+        if (!$handler instanceof HandlerInterface) {
+            throw new \UnexpectedValueException("Handler must implement HandlerInterface");
+        }
+        return $handler;
+    }
+}

test/HandlerUnpackerTest.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace pjdietz\WellRESTed\Test;
+
+use pjdietz\WellRESTed\HandlerUnpacker;
+use pjdietz\WellRESTed\Interfaces\HandlerInterface;
+use pjdietz\WellRESTed\Interfaces\RequestInterface;
+
+/**
+ * @covers pjdietz\WellRESTed\HandlerUnpacker
+ */
+class HandlerUnpackerTest extends \PHPUnit_Framework_TestCase
+{
+    public function testUnpacksFromCallable()
+    {
+        $handlerContainer = function () {
+            return new HandlerUnpackerTest_Handler();
+        };
+        $handlerUnpacker = new HandlerUnpacker();
+        $handler = $handlerUnpacker->unpack($handlerContainer);
+        $this->assertInstanceOf("\\pjdietz\\WellRESTed\\Interfaces\\HandlerInterface", $handler);
+    }
+
+    public function testUnpacksFromString()
+    {
+        $handlerContainer = __NAMESPACE__ . "\\HandlerUnpackerTest_Handler";
+        $handlerUnpacker = new HandlerUnpacker();
+        $handler = $handlerUnpacker->unpack($handlerContainer);
+        $this->assertInstanceOf("\\pjdietz\\WellRESTed\\Interfaces\\HandlerInterface", $handler);
+    }
+
+    public function testUnpacksInstance()
+    {
+        $handler = new HandlerUnpackerTest_Handler();
+        $handlerUnpacker = new HandlerUnpacker();
+        $handler = $handlerUnpacker->unpack($handler);
+        $this->assertInstanceOf("\\pjdietz\\WellRESTed\\Interfaces\\HandlerInterface", $handler);
+    }
+
+    /**
+     * @expectedException \UnexpectedValueException
+     */
+    public function testThrowsExceptionWhenUnpackedInstanceDoesNotImplementInterface()
+    {
+        $handlerUnpacker = new HandlerUnpacker();
+        $handlerUnpacker->unpack("\\stdClass");
+    }
+}
+
+class HandlerUnpackerTest_Handler implements HandlerInterface
+{
+    public function getResponse(RequestInterface $request, array $args = null)
+    {
+        return null;
+    }
+}