Row objects and Cell styling

This commit introduces Row and Cell entities, that will replace the arrays passed in previously.
It also adds support for Cell styling (instead of Row styling only).

src/Spout/Writer/WriterMultiSheetsAbstract.php

@@ -7,6 +7,7 @@ use Box\Spout\Common\Helper\GlobalFunctionsHelper;
 use Box\Spout\Common\Manager\OptionsManagerInterface;
 use Box\Spout\Writer\Common\Creator\ManagerFactoryInterface;
 use Box\Spout\Writer\Common\Entity\Options;
+use Box\Spout\Writer\Common\Entity\Row;
 use Box\Spout\Writer\Common\Entity\Sheet;
 use Box\Spout\Writer\Common\Entity\Worksheet;
 use Box\Spout\Writer\Common\Manager\Style\StyleMerger;
@@ -65,10 +66,7 @@ abstract class WriterMultiSheetsAbstract extends WriterAbstract
     }
 
     /**
-     * Configures the write and sets the current sheet pointer to a new sheet.
-     *
-     * @throws \Box\Spout\Common\Exception\IOException If unable to open the file for writing
-     * @return void
+     * {@inheritdoc}
      */
     protected function openWriter()
     {
@@ -159,27 +157,16 @@ abstract class WriterMultiSheetsAbstract extends WriterAbstract
     }
 
     /**
-     * Adds data to the currently opened writer.
-     * If shouldCreateNewSheetsAutomatically option is set to true, it will handle pagination
-     * with the creation of new worksheets if one worksheet has reached its maximum capicity.
-     *
-     * @param array $dataRow Array containing data to be written.
-     *          Example $dataRow = ['data1', 1234, null, '', 'data5'];
-     * @param \Box\Spout\Writer\Common\Entity\Style\Style $style Style to be applied to the row.
-     * @throws WriterNotOpenedException If the book is not created yet
-     * @throws \Box\Spout\Common\Exception\IOException If unable to write data
-     * @return void
+     * {@inheritdoc}
      */
-    protected function addRowToWriter(array $dataRow, $style)
+    protected function addRowToWriter(Row $row)
     {
         $this->throwIfWorkbookIsNotAvailable();
-        $this->workbookManager->addRowToCurrentWorksheet($dataRow, $style);
+        $this->workbookManager->addRowToCurrentWorksheet($row);
     }
 
     /**
-     * Closes the writer, preventing any additional writing.
-     *
-     * @return void
+     * {@inheritdoc}
      */
     protected function closeWriter()
     {