autodetect class and protocol

src/CallbackWrapper.php

@@ -72,7 +72,7 @@ class CallbackWrapper extends Wrapper {
 				'preClose' => $preClose,
 			)
 		));
-		return Wrapper::wrapSource($source, $context, 'callback', '\Icewind\Streams\CallbackWrapper');
+		return self::wrapSource($source, $context);
 	}
 
 	protected function open() {

src/CountWrapper.php

@@ -69,7 +69,7 @@ class CountWrapper extends Wrapper {
 				'callback' => $callback
 			)
 		));
-		return Wrapper::wrapSource($source, $context, 'callback', '\Icewind\Streams\CountWrapper');
+		return self::wrapSource($source, $context);
 	}
 
 	protected function open() {

src/DirectoryFilter.php

@@ -55,6 +55,6 @@ class DirectoryFilter extends DirectoryWrapper {
 				'filter' => $filter
 			)
 		);
-		return self::wrapWithOptions($options, '\Icewind\Streams\DirectoryFilter');
+		return self::wrapWithOptions($options);
 	}
 }

src/DirectoryWrapper.php

@@ -75,10 +75,11 @@ class DirectoryWrapper implements Directory {
 
 	/**
 	 * @param array $options the options for the context to wrap the stream with
-	 * @param string $class
+	 * @param null $class  deprecated, class is now automatically generated
 	 * @return resource
 	 */
-	protected static function wrapWithOptions($options, $class) {
+	protected static function wrapWithOptions($options, $class = null) {
+        $class = static::class;
 		$context = stream_context_create($options);
 		stream_wrapper_register('dirwrapper', $class);
 		$wrapped = opendir('dirwrapper://', $context);

src/IteratorDirectory.php

@@ -115,7 +115,7 @@ class IteratorDirectory implements Directory {
 		} else {
 			throw new \BadMethodCallException('$source should be an Iterator or array');
 		}
-		stream_wrapper_register('iterator', '\Icewind\Streams\IteratorDirectory');
+		stream_wrapper_register('iterator', static::class);
 		$wrapped = opendir('iterator://', $context);
 		stream_wrapper_unregister('iterator');
 		return $wrapped;

src/NullWrapper.php

@@ -24,7 +24,7 @@ class NullWrapper extends Wrapper {
 			'null' => array(
 				'source' => $source)
 		));
-		return Wrapper::wrapSource($source, $context, 'null', '\Icewind\Streams\NullWrapper');
+		return self::wrapSource($source, $context);
 	}
 
 	public function stream_open($path, $mode, $options, &$opened_path) {

src/RetryWrapper.php

@@ -24,7 +24,7 @@ class RetryWrapper extends Wrapper {
 				'source' => $source
 			)
 		));
-		return Wrapper::wrapSource($source, $context, 'retry', '\Icewind\Streams\RetryWrapper');
+		return self::wrapSource($source, $context);
 	}
 
 	protected function open() {

src/SeekableWrapper.php

@@ -39,7 +39,7 @@ class SeekableWrapper extends Wrapper {
 				'source' => $source
 			)
 		));
-		return Wrapper::wrapSource($source, $context, 'callback', '\Icewind\Streams\SeekableWrapper');
+		return self::wrapSource($source, $context);
 	}
 
 	public function dir_opendir($path, $options) {

src/UrlCallBack.php

@@ -61,7 +61,7 @@ class UrlCallback extends Wrapper implements Url {
 			'unlink' => $unlink,
 			'stat' => $stat
 		);
-		return new Path('\Icewind\Streams\UrlCallBack', $options);
+		return new Path(static::class, $options);
 	}
 
 	protected function loadContext($url) {

src/Wrapper.php

@@ -25,7 +25,19 @@ abstract class Wrapper implements File, Directory {
 	 */
 	protected $source;
 
-	protected static function wrapSource($source, $context, $protocol, $class) {
+	/**
+	 * @param $source
+	 * @param $context
+	 * @param null $protocol deprecated, protocol is now automatically generated
+	 * @param null $class deprecated, class is now automatically generated
+	 * @return bool|resource
+	 */
+	protected static function wrapSource($source, $context, $protocol = null, $class = null) {
+		if ($class === null) {
+			$class = static::class;
+		}
+		$parts = explode('\\', $class);
+		$protocol = strtolower(array_pop($parts));
 		if (!is_resource($source)) {
 			throw new \BadMethodCallException();
 		}

tests/DirectoryWrapper.php

@@ -13,7 +13,7 @@ class DirectoryWrapperNull extends \Icewind\Streams\DirectoryWrapper {
 			'dir' => array(
 				'source' => $source)
 		);
-		return self::wrapWithOptions($options, '\Icewind\Streams\Tests\DirectoryWrapperNull');
+		return self::wrapWithOptions($options);
 	}
 }
 
@@ -23,7 +23,7 @@ class DirectoryWrapperDummy extends \Icewind\Streams\DirectoryWrapper {
 			'dir' => array(
 				'source' => $source)
 		);
-		return self::wrapWithOptions($options, '\Icewind\Streams\Tests\DirectoryWrapperDummy');
+		return self::wrapWithOptions($options);
 	}
 
 	public function dir_readdir() {

tests/RetryWrapper.php

@@ -21,7 +21,7 @@ class PartialWrapper extends \Icewind\Streams\NullWrapper {
 			'null' => array(
 				'source' => $source)
 		));
-		return self::wrapSource($source, $context, 'partial', '\Icewind\Streams\Tests\PartialWrapper');
+		return self::wrapSource($source, $context);
 	}
 
 	public function stream_read($count) {
@@ -49,7 +49,7 @@ class FailWrapper extends \Icewind\Streams\NullWrapper {
 			'null' => array(
 				'source' => $source)
 		));
-		return self::wrapSource($source, $context, 'fail', '\Icewind\Streams\Tests\FailWrapper');
+		return self::wrapSource($source, $context);
 	}
 
 	public function stream_read($count) {