Begin optimize xlsx write

src/Spout/Common/Entity/Style/EmptyStyle.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Box\Spout\Common\Entity\Style;
+
+class EmptyStyle extends Style
+{
+}

src/Spout/Writer/Common/Manager/Style/StyleRegistry.php

@@ -36,7 +36,7 @@ class StyleRegistry
     {
         $serializedStyle = $this->serialize($style);
 
-        if (!$this->hasStyleAlreadyBeenRegistered($style)) {
+        if (!$this->hasSerializedStyleAlreadyBeenRegistered($serializedStyle)) {
             $nextStyleId = \count($this->serializedStyleToStyleIdMappingTable);
             $style->setId($nextStyleId);
 
@@ -57,6 +57,17 @@ class StyleRegistry
     {
         $serializedStyle = $this->serialize($style);
 
+        return $this->hasSerializedStyleAlreadyBeenRegistered($serializedStyle);
+    }
+
+    /**
+     * Returns whether the serialized style has already been registered.
+     *
+     * @param string $serializedStyle The serialized style
+     * @return bool
+     */
+    protected function hasSerializedStyleAlreadyBeenRegistered(string $serializedStyle)
+    {
         // Using isset here because it is way faster than array_key_exists...
         return isset($this->serializedStyleToStyleIdMappingTable[$serializedStyle]);
     }

src/Spout/Writer/ODS/Manager/WorksheetManager.php

@@ -4,6 +4,7 @@ namespace Box\Spout\Writer\ODS\Manager;
 
 use Box\Spout\Common\Entity\Cell;
 use Box\Spout\Common\Entity\Row;
+use Box\Spout\Common\Entity\Style\EmptyStyle;
 use Box\Spout\Common\Entity\Style\Style;
 use Box\Spout\Common\Exception\InvalidArgumentException;
 use Box\Spout\Common\Exception\IOException;
@@ -157,9 +158,13 @@ class WorksheetManager implements WorksheetManagerInterface
      */
     private function applyStyleAndGetCellXML(Cell $cell, Style $rowStyle, $currentCellIndex, $nextCellIndex)
     {
-        // Apply row and extra styles
+        if ($cell->getStyle() instanceof EmptyStyle) {
-        $mergedCellAndRowStyle = $this->styleMerger->merge($cell->getStyle(), $rowStyle);
+            $cell->setStyle($rowStyle);
-        $cell->setStyle($mergedCellAndRowStyle);
+        } else {
+            $mergedCellAndRowStyle = $this->styleMerger->merge($cell->getStyle(), $rowStyle);
+            $cell->setStyle($mergedCellAndRowStyle);
+        }
+
         $newCellStyle = $this->styleManager->applyExtraStylesIfNeeded($cell);
 
         $registeredStyle = $this->styleManager->registerStyle($newCellStyle);

src/Spout/Writer/XLSX/Manager/WorksheetManager.php

@@ -4,6 +4,7 @@ namespace Box\Spout\Writer\XLSX\Manager;
 
 use Box\Spout\Common\Entity\Cell;
 use Box\Spout\Common\Entity\Row;
+use Box\Spout\Common\Entity\Style\EmptyStyle;
 use Box\Spout\Common\Entity\Style\Style;
 use Box\Spout\Common\Exception\InvalidArgumentException;
 use Box\Spout\Common\Exception\IOException;
@@ -185,11 +186,14 @@ EOD;
      */
     private function applyStyleAndGetCellXML(Cell $cell, Style $rowStyle, $rowIndexOneBased, $columnIndexZeroBased)
     {
-        // Apply row and extra styles
+        if ($cell->getStyle() instanceof EmptyStyle) {
-        $mergedCellAndRowStyle = $this->styleMerger->merge($cell->getStyle(), $rowStyle);
+            $cell->setStyle($rowStyle);
-        $cell->setStyle($mergedCellAndRowStyle);
+        } else {
-        $newCellStyle = $this->styleManager->applyExtraStylesIfNeeded($cell);
+            $mergedCellAndRowStyle = $this->styleMerger->merge($cell->getStyle(), $rowStyle);
+            $cell->setStyle($mergedCellAndRowStyle);
+        }
 
+        $newCellStyle = $this->styleManager->applyExtraStylesIfNeeded($cell);
         $registeredStyle = $this->styleManager->registerStyle($newCellStyle);
 
         return $this->getCellXML($rowIndexOneBased, $columnIndexZeroBased, $cell, $registeredStyle->getId());