format: Refactor format factory to non-static class

The format factory can be based on the abstract factory class if it
wasn't static. This allows for higher abstraction and makes future
extensions possible. Also, not all parts of RSS-Bridge need to work
on the same instance of the factory.

References #1001

actions/DisplayAction.php

@@ -215,7 +215,9 @@ class DisplayAction extends ActionAbstract {
 
 		// Data transformation
 		try {
-			$format = Format::create($format);
+			$formatFac = new FormatFactory();
+			$formatFac->setWorkingDir(PATH_LIB_FORMATS);
+			$format = $formatFac->create($format);
 			$format->setItems($items);
 			$format->setExtraInfos($infos);
 			$format->setLastModified($cache->getTime());

lib/BridgeList.php

@@ -63,9 +63,11 @@ EOD;
 
 		$bridgeFac = new \BridgeFactory();
 		$bridgeFac->setWorkingDir(PATH_LIB_BRIDGES);
-
 		$bridgeList = $bridgeFac->getBridgeNames();
-		$formats = Format::getFormatNames();
+
+		$formatFac = new FormatFactory();
+		$formatFac->setWorkingDir(PATH_LIB_FORMATS);
+		$formats = $formatFac->getFormatNames();
 
 		$totalBridges = count($bridgeList);
 

lib/FormatFactory.php

@@ -31,29 +31,7 @@
  * $format = Format::create('Atom');
  * ```
  */
-class Format {
-
-	/**
-	 * Holds a path to the working directory.
-	 *
-	 * Do not access this property directly!
-	 * Use {@see Format::setWorkingDir()} and {@see Format::getWorkingDir()} instead.
-	 *
-	 * @var string|null
-	 */
-	protected static $workingDir = null;
-
-	/**
-	 * Throws an exception when trying to create a new instance of this class.
-	 * Use {@see Format::create()} to create a new format object from the working
-	 * directory.
-	 *
-	 * @throws \LogicException if called.
-	 */
-	public function __construct(){
-		throw new \LogicException('Use ' . __CLASS__ . '::create($name) to create cache objects!');
-	}
-
+class FormatFactory extends FactoryAbstract {
 	/**
 	 * Creates a new format object from the working directory.
 	 *
@@ -63,13 +41,13 @@ class Format {
 	 * @param string $name Name of the format object.
 	 * @return object|bool The format object or false if the class is not instantiable.
 	 */
-	public static function create($name){
-		if(!self::isFormatName($name)) {
+	public function create($name){
+		if(!$this->isFormatName($name)) {
 			throw new \InvalidArgumentException('Format name invalid!');
 		}
 
-		$name = self::sanitizeFormatName($name) . 'Format';
-		$pathFormat = self::getWorkingDir() . $name . '.php';
+		$name = $this->sanitizeFormatName($name) . 'Format';
+		$pathFormat = $this->getWorkingDir() . $name . '.php';
 
 		if(!file_exists($pathFormat)) {
 			throw new \Exception('Format file ' . $filePath . ' does not exist!');
@@ -84,48 +62,6 @@ class Format {
 		return false;
 	}
 
-	/**
-	 * Sets the working directory.
-	 *
-	 * @param string $dir Path to a directory containing cache classes
-	 * @throws \InvalidArgumentException if $dir is not a string.
-	 * @throws \Exception if the working directory doesn't exist.
-	 * @throws \InvalidArgumentException if $dir is not a directory.
-	 * @return void
-	 */
-	public static function setWorkingDir($dir){
-		self::$workingDir = null;
-
-		if(!is_string($dir)) {
-			throw new \InvalidArgumentException('Dir format must be a string.');
-		}
-
-		if(!file_exists($dir)) {
-			throw new \Exception('Working directory does not exist!');
-		}
-
-		if(!is_dir($dir)) {
-			throw new \InvalidArgumentException('Working directory is not a directory!');
-		}
-
-		self::$workingDir = realpath($dir) . '/';
-	}
-
-	/**
-	 * Returns the working directory.
-	 * The working directory must be set with {@see Format::setWorkingDir()}!
-	 *
-	 * @throws \LogicException if the working directory is not set.
-	 * @return string The current working directory.
-	 */
-	public static function getWorkingDir(){
-		if(is_null(self::$workingDir)) {
-			throw new \LogicException('Working directory is not set!');
-		}
-
-		return self::$workingDir;
-	}
-
 	/**
 	 * Returns true if the provided name is a valid format name.
 	 *
@@ -135,7 +71,7 @@ class Format {
 	 * @param string $name The format name.
 	 * @return bool true if the name is a valid format name, false otherwise.
 	 */
-	public static function isFormatName($name){
+	public function isFormatName($name){
 		return is_string($name) && preg_match('/^[A-Z][a-zA-Z0-9-]*$/', $name) === 1;
 	}
 
@@ -146,11 +82,11 @@ class Format {
 	 *
 	 * @return array List of format names
 	 */
-	public static function getFormatNames(){
+	public function getFormatNames(){
 		static $formatNames = array(); // Initialized on first call
 
 		if(empty($formatNames)) {
-			$files = scandir(self::getWorkingDir());
+			$files = scandir($this->getWorkingDir());
 
 			if($files !== false) {
 				foreach($files as $file) {
@@ -181,7 +117,7 @@ class Format {
 	 * @return string|null The sanitized format name if the provided name is
 	 * valid, null otherwise.
 	 */
-	protected static function sanitizeFormatName($name) {
+	protected function sanitizeFormatName($name) {
 
 		if(is_string($name)) {
 
@@ -196,15 +132,15 @@ class Format {
 			}
 
 			// Improve performance for correctly written format names
-			if(in_array($name, self::getFormatNames())) {
-				$index = array_search($name, self::getFormatNames());
-				return self::getFormatNames()[$index];
+			if(in_array($name, $this->getFormatNames())) {
+				$index = array_search($name, $this->getFormatNames());
+				return $this->getFormatNames()[$index];
 			}
 
 			// The name is valid if a corresponding format file is found on disk
-			if(in_array(strtolower($name), array_map('strtolower', self::getFormatNames()))) {
-				$index = array_search(strtolower($name), array_map('strtolower', self::getFormatNames()));
-				return self::getFormatNames()[$index];
+			if(in_array(strtolower($name), array_map('strtolower', $this->getFormatNames()))) {
+				$index = array_search(strtolower($name), array_map('strtolower', $this->getFormatNames()));
+				return $this->getFormatNames()[$index];
 			}
 
 			Debug::log('Invalid format name: "' . $name . '"!');

lib/rssbridge.php

@@ -61,7 +61,7 @@ require_once PATH_LIB . 'FactoryAbstract.php';
 require_once PATH_LIB . 'FeedItem.php';
 require_once PATH_LIB . 'Debug.php';
 require_once PATH_LIB . 'Exceptions.php';
-require_once PATH_LIB . 'Format.php';
+require_once PATH_LIB . 'FormatFactory.php';
 require_once PATH_LIB . 'FormatAbstract.php';
 require_once PATH_LIB . 'BridgeFactory.php';
 require_once PATH_LIB . 'BridgeAbstract.php';
@@ -84,12 +84,3 @@ require_once PATH_LIB . 'contents.php';
 define('MAX_FILE_SIZE', 10000000); /* Allow larger files for simple_html_dom */
 require_once PATH_LIB_VENDOR . 'simplehtmldom/simple_html_dom.php';
 require_once PATH_LIB_VENDOR . 'php-urljoin/src/urljoin.php';
-
-// Initialize static members
-try {
-	Format::setWorkingDir(PATH_LIB_FORMATS);
-} catch(Exception $e) {
-	error_log($e);
-	header('Content-type: text/plain', true, 500);
-	die($e->getMessage());
-}

tests/AtomFormatTest.php

@@ -77,7 +77,9 @@ class AtomFormatTest extends TestCase {
 	}
 
 	private function initFormat() {
-		$this->format = \Format::create('Atom');
+		$formatFac = new FormatFactory();
+		$formatFac->setWorkingDir(PATH_LIB_FORMATS);
+		$this->format = $formatFac->create('Atom');
 		$this->format->setItems($this->sample->items);
 		$this->format->setExtraInfos($this->sample->meta);
 		$this->format->setLastModified(strtotime('2000-01-01 12:00:00 UTC'));

tests/JsonFormatTest.php

@@ -77,7 +77,9 @@ class JsonFormatTest extends TestCase {
 	}
 
 	private function initFormat() {
-		$this->format = \Format::create('Json');
+		$formatFac = new FormatFactory();
+		$formatFac->setWorkingDir(PATH_LIB_FORMATS);
+		$this->format = $formatFac->create('Json');
 		$this->format->setItems($this->sample->items);
 		$this->format->setExtraInfos($this->sample->meta);
 		$this->format->setLastModified(strtotime('2000-01-01 12:00:00 UTC'));

tests/MrssFormatTest.php

@@ -78,7 +78,9 @@ class MrssFormatTest extends TestCase {
 	}
 
 	private function initFormat() {
-		$this->format = \Format::create('Mrss');
+		$formatFac = new FormatFactory();
+		$formatFac->setWorkingDir(PATH_LIB_FORMATS);
+		$this->format = $formatFac->create('Mrss');
 		$this->format->setItems($this->sample->items);
 		$this->format->setExtraInfos($this->sample->meta);
 		$this->format->setLastModified(strtotime('2000-01-01 12:00:00 UTC'));