From be265113a20e0fd99ed9127220c45fb5c970c992 Mon Sep 17 00:00:00 2001
From: HorstOeko <horstoeko@erling.com.de>
Date: Thu, 17 Aug 2023 05:11:15 +0200
Subject: [PATCH] Adding XMLDataCache to ZugferdDocumentPdfBuilder (like
 ZugferdDocumentPdfMerger)

---
 src/ZugferdDocumentPdfBuilder.php | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/ZugferdDocumentPdfBuilder.php b/src/ZugferdDocumentPdfBuilder.php
index a9049c77..2cf7cc6f 100644
--- a/src/ZugferdDocumentPdfBuilder.php
+++ b/src/ZugferdDocumentPdfBuilder.php
@@ -31,6 +31,13 @@ class ZugferdDocumentPdfBuilder extends ZugferdDocumentAbstractPdfBuilder
      */
     private $documentBuiler = null;
 
+    /**
+     * Cached XML data
+     *
+     * @var string
+     */
+    private $xmlDataCache = "";
+
     /**
      * Constructor
      *
@@ -52,7 +59,13 @@ public function __construct(ZugferdDocumentBuilder $documentBuiler, string $pdfD
      */
     protected function getXmlContent(): string
     {
-        return $this->documentBuiler->getContentAsDomDocument()->saveXML();
+        if ($this->xmlDataCache) {
+            return $this->xmlDataCache;
+        }
+
+        $this->xmlDataCache = $this->documentBuiler->getContentAsDomDocument()->saveXML();
+
+        return $this->xmlDataCache;
     }
 
     /**