Update Reader/WriterEntityFactory

Add `WriterEntityFactory::createWriterFromFile`, working like `ReaderEntityFactory::createReaderFromFile` (guessing writer type from file name).
Use static functions when needed.

src/Spout/Writer/Common/Creator/WriterEntityFactory.php

@@ -22,7 +22,20 @@ class WriterEntityFactory
      */
     public static function createWriter($writerType)
     {
-        return (new WriterFactory())->create($writerType);
+        return WriterFactory::create($writerType);
+    }
+
+    /**
+     * This creates an instance of the appropriate writer, given the extension of the file to be written
+     *
+     * @param string $path The path to the spreadsheet file. Supported extensions are .csv, .ods and .xlsx
+     * @throws \Box\Spout\Common\Exception\IOException
+     * @throws \Box\Spout\Common\Exception\UnsupportedTypeException
+     * @return WriterInterface
+     */
+    public static function createWriterFromFile(string $path)
+    {
+        return WriterFactory::createFromFile($path);
     }
 
     /**

src/Spout/Writer/Common/Creator/WriterFactory.php

@@ -3,6 +3,7 @@
 namespace Box\Spout\Writer\Common\Creator;
 
 use Box\Spout\Common\Creator\HelperFactory;
+use Box\Spout\Common\Exception\IOException;
 use Box\Spout\Common\Exception\UnsupportedTypeException;
 use Box\Spout\Common\Helper\GlobalFunctionsHelper;
 use Box\Spout\Common\Type;
@@ -26,6 +27,16 @@ use Box\Spout\Writer\XLSX\Writer as XLSXWriter;
  */
 class WriterFactory
 {
+    /**
+     * Map file extensions to reader types
+     * @var array
+     */
+    private static $extensionReaderMap = [
+        'csv' => Type::CSV,
+        'ods' => Type::ODS,
+        'xlsx' => Type::XLSX,
+    ];
+
     /**
      * This creates an instance of the appropriate writer, given the type of the file to be read
      *
@@ -33,21 +44,49 @@ class WriterFactory
      * @throws \Box\Spout\Common\Exception\UnsupportedTypeException
      * @return WriterInterface
      */
-    public function create($writerType)
+    public static function create($writerType)
     {
         switch ($writerType) {
-            case Type::CSV: return $this->getCSVWriter();
-            case Type::XLSX: return $this->getXLSXWriter();
-            case Type::ODS: return $this->getODSWriter();
+            case Type::CSV: return self::getCSVWriter();
+            case Type::XLSX: return self::getXLSXWriter();
+            case Type::ODS: return self::getODSWriter();
             default:
                 throw new UnsupportedTypeException('No writers supporting the given type: ' . $writerType);
         }
     }
 
+    /**
+     * This creates an instance of the appropriate writer, given the extension of the file to be written
+     *
+     * @param string $path The path to the spreadsheet file. Supported extensions are .csv,.ods and .xlsx
+     * @throws \Box\Spout\Common\Exception\IOException
+     * @throws \Box\Spout\Common\Exception\UnsupportedTypeException
+     * @return WriterInterface
+     */
+    public static function createFromFile(string $path)
+    {
+        if (!is_file($path)) {
+            throw new IOException(
+                sprintf('Could not open "%s" for reading! File does not exist.', $path)
+            );
+        }
+
+        $ext = pathinfo($path, PATHINFO_EXTENSION);
+        $ext = strtolower($ext);
+        $readerType = self::$extensionReaderMap[$ext] ?? null;
+        if ($readerType === null) {
+            throw new UnsupportedTypeException(
+                sprintf('No readers supporting the file extension "%s".', $ext)
+            );
+        }
+
+        return self::create($readerType);
+    }
+
     /**
      * @return CSVWriter
      */
-    private function getCSVWriter()
+    private static function getCSVWriter()
     {
         $optionsManager = new CSVOptionsManager();
         $globalFunctionsHelper = new GlobalFunctionsHelper();
@@ -60,7 +99,7 @@ class WriterFactory
     /**
      * @return XLSXWriter
      */
-    private function getXLSXWriter()
+    private static function getXLSXWriter()
     {
         $styleBuilder = new StyleBuilder();
         $optionsManager = new XLSXOptionsManager($styleBuilder);
@@ -75,7 +114,7 @@ class WriterFactory
     /**
      * @return ODSWriter
      */
-    private function getODSWriter()
+    private static function getODSWriter()
     {
         $styleBuilder = new StyleBuilder();
         $optionsManager = new ODSOptionsManager($styleBuilder);