From 020fd0305248def48a8109a61eb5c6656931a50c Mon Sep 17 00:00:00 2001
From: langfr <frank.langelage@outlook.de>
Date: Fri, 23 May 2025 12:36:01 +0100
Subject: [PATCH] Re-Initialize the HTML-template on language change.

Handle templates in an language based map for switching language.
---
 .../ZUGFeRD/ZUGFeRDVisualizer.java            | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDVisualizer.java b/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDVisualizer.java
index d4f280a9..53144a65 100644
--- a/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDVisualizer.java
+++ b/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDVisualizer.java
@@ -46,6 +46,8 @@ import javax.xml.transform.stream.StreamResult;
 import javax.xml.transform.stream.StreamSource;
 import java.io.*;
 import java.nio.charset.StandardCharsets;
+import java.util.HashMap;
+import java.util.Map;
 import java.util.Optional;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.Consumer;
@@ -77,7 +79,7 @@ public class ZUGFeRDVisualizer {
 	private Templates mXsltXRTemplate = null;
 	private Templates mXsltUBLTemplate = null;
 	private Templates mXsltCIOTemplate = null;
-	private Templates mXsltHTMLTemplate = null;
+	private Map<Language, Templates> mXsltHTMLTemplates = null;
 	private Templates mXsltPDFTemplate = null;
 	private Templates mXsltZF1HTMLTemplate = null;
 
@@ -179,7 +181,7 @@ public class ZUGFeRDVisualizer {
 		Optional<InputStream> in = copyStream(htmlOutput);
 		ByteArrayOutputStream htmlOutStream = new ByteArrayOutputStream();
 		if (in.isPresent()) {
-			applyXSLTToHTML(in.get(), htmlOutStream);
+			applyXSLTToHTML(in.get(), htmlOutStream, lang);
 		}
 
 		return htmlOutStream.toString(StandardCharsets.UTF_8);
@@ -222,9 +224,12 @@ public class ZUGFeRDVisualizer {
 				new StreamSource(CLASS_LOADER.getResourceAsStream(RESOURCE_PATH + "stylesheets/cii-xr.xsl")));
 		}
 
-		if (mXsltHTMLTemplate == null) {
-			mXsltHTMLTemplate = mFactory.newTemplates(new StreamSource(
-				CLASS_LOADER.getResourceAsStream(RESOURCE_PATH + "stylesheets/xrechnung-html." + lang.name().toLowerCase() + ".xsl")));
+		if (mXsltHTMLTemplates == null) {
+			mXsltHTMLTemplates = new HashMap<>();
+			if (mXsltHTMLTemplates.get(lang) == null) {
+				Templates mXsltHTMLTemplate = mFactory.newTemplates(new StreamSource(CLASS_LOADER.getResourceAsStream(RESOURCE_PATH + "stylesheets/xrechnung-html." + lang.name().toLowerCase() + ".xsl")));
+				mXsltHTMLTemplates.put(lang, mXsltHTMLTemplate);
+			}
 		}
 		if (mXsltZF1HTMLTemplate == null) {
 			mXsltZF1HTMLTemplate = mFactory.newTemplates(new StreamSource(
@@ -442,9 +447,9 @@ public class ZUGFeRDVisualizer {
 		transformer.transform(new StreamSource(xmlFile), new StreamResult(htmlOutStream));
 	}
 
-	protected void applyXSLTToHTML(final InputStream xmlFile, final OutputStream htmlOutStream)
+	protected void applyXSLTToHTML(final InputStream xmlFile, final OutputStream htmlOutStream, Language lang)
 		throws TransformerException, IOException {
-		Transformer transformer = mXsltHTMLTemplate.newTransformer();
+		Transformer transformer = mXsltHTMLTemplates.get(lang).newTransformer();
 
 		transformer.transform(new StreamSource(xmlFile), new StreamResult(htmlOutStream));
 		xmlFile.close();