Add $storage->instanceOfStorage to handle instanceof for storage wrappers

lib/private/files/storage/common.php

@@ -7,6 +7,7 @@
  */
 
 namespace OC\Files\Storage;
+
 use OC\Files\Filesystem;
 use OC\Files\Cache\Watcher;
 
@@ -21,7 +22,6 @@ use OC\Files\Cache\Watcher;
  * Some \OC\Files\Storage\Common methods call functions which are first defined
  * in classes which extend it, e.g. $this->stat() .
  */
-
 abstract class Common implements \OC\Files\Storage\Storage {
 	protected $cache;
 	protected $scanner;
@@ -46,7 +46,7 @@ abstract class Common implements \OC\Files\Storage\Storage {
 	protected function remove($path) {
 		if ($this->is_dir($path)) {
 			return $this->rmdir($path);
-		} else if($this->is_file($path)) {
+		} else if ($this->is_file($path)) {
 			return $this->unlink($path);
 		} else {
 			return false;
@@ -412,4 +412,14 @@ abstract class Common implements \OC\Files\Storage\Storage {
 	protected function removeCachedFile($path) {
 		unset($this->cachedFiles[$path]);
 	}
+
+	/**
+	 * Check if the storage is an instance of $class or is a wrapper for a storage that is an instance of $class
+	 *
+	 * @param string $class
+	 * @return bool
+	 */
+	public function instanceOfStorage($class) {
+		return is_a($this, $class);
+	}
 }

lib/private/files/storage/wrapper/wrapper.php

@@ -440,4 +440,14 @@ class Wrapper implements \OC\Files\Storage\Storage {
 	public function isLocal() {
 		return $this->storage->isLocal();
 	}
+
+	/**
+	 * Check if the storage is an instance of $class or is a wrapper for a storage that is an instance of $class
+	 *
+	 * @param string $class
+	 * @return bool
+	 */
+	public function instanceOfStorage($class) {
+		return is_a($this, $class) or $this->storage->instanceOfStorage($class);
+	}
 }

lib/public/files/storage.php

@@ -327,4 +327,12 @@ interface Storage {
 	 * @return bool true if the files are stored locally, false otherwise
 	 */
 	public function isLocal();
+
+	/**
+	 * Check if the storage is an instance of $class or is a wrapper for a storage that is an instance of $class
+	 *
+	 * @param string $class
+	 * @return bool
+	 */
+	public function instanceOfStorage($class);
 }

tests/lib/files/storage/storage.php

@@ -464,4 +464,10 @@ abstract class Storage extends \PHPUnit_Framework_TestCase {
 
 		$this->assertEquals('foo', $this->instance->file_get_contents('target/test1.txt'));
 	}
+
+	public function testInstanceOfStorage() {
+		$this->assertTrue($this->instance->instanceOfStorage('\OCP\Files\Storage'));
+		$this->assertTrue($this->instance->instanceOfStorage(get_class($this->instance)));
+		$this->assertFalse($this->instance->instanceOfStorage('\OC'));
+	}
 }

tests/lib/files/storage/wrapper/quota.php

@@ -155,4 +155,10 @@ class Quota extends \Test\Files\Storage\Storage {
 
 		$this->assertEquals(1024 - 50, $instance->free_space(''));
 	}
+
+	public function testInstanceOfStorageWrapper() {
+		$this->assertTrue($this->instance->instanceOfStorage('\OC\Files\Storage\Local'));
+		$this->assertTrue($this->instance->instanceOfStorage('\OC\Files\Storage\Wrapper\Wrapper'));
+		$this->assertTrue($this->instance->instanceOfStorage('\OC\Files\Storage\Wrapper\Quota'));
+	}
 }

tests/lib/files/storage/wrapper/wrapper.php

@@ -23,4 +23,9 @@ class Wrapper extends \Test\Files\Storage\Storage {
 	public function tearDown() {
 		\OC_Helper::rmdirr($this->tmpDir);
 	}
+
+	public function testInstanceOfStorageWrapper() {
+		$this->assertTrue($this->instance->instanceOfStorage('\OC\Files\Storage\Local'));
+		$this->assertTrue($this->instance->instanceOfStorage('\OC\Files\Storage\Wrapper\Wrapper'));
+	}
 }