Add more type hinting

lib/private/preview/provider.php

@@ -26,7 +26,7 @@ abstract class Provider implements IProvider {
 	 * @param \OCP\Files\FileInfo $file
 	 * @return bool
 	 */
-	public function isAvailable($file) {
+	public function isAvailable(\OCP\Files\FileInfo $file) {
 		return true;
 	}
 

lib/private/preview/txt.php

@@ -18,7 +18,7 @@ class TXT extends Provider {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function isAvailable($file) {
+	public function isAvailable(\OCP\Files\FileInfo $file) {
 		return $file->getSize() > 5;
 	}
 

lib/public/ipreview.php

@@ -41,7 +41,7 @@ interface IPreview {
 	 * In order to improve lazy loading a closure can be registered which will be
 	 * called in case preview providers are actually requested
 	 *
-	 * $callable has to return an instance of \OC\Preview\Provider
+	 * $callable has to return an instance of \OCP\Preview\IProvider
 	 *
 	 * @param string $mimeTypeRegex Regex with the mime types that are supported by this provider
 	 * @param \Closure $callable

lib/public/preview/iprovider.php

@@ -23,7 +23,7 @@ interface IProvider {
 	 * @param \OCP\Files\FileInfo $file
 	 * @return bool
 	 */
-	public function isAvailable($file);
+	public function isAvailable(\OCP\Files\FileInfo $file);
 
 	/**
 	 * get thumbnail for file at path $path