update

ts/formats/decoder.factory.ts

@@ -0,0 +1,52 @@
+import { BaseDecoder } from './base.decoder.js';
+import { FacturXDecoder } from './facturx.decoder.js';
+import { XInvoiceDecoder } from './xinvoice.decoder.js';
+
+/**
+ * Factory class for creating the appropriate decoder based on XML format.
+ * Analyzes XML content and returns the best decoder for the given format.
+ */
+export class DecoderFactory {
+  /**
+   * Creates a decoder for the given XML content
+   */
+  public static createDecoder(xmlString: string): BaseDecoder {
+    if (!xmlString) {
+      throw new Error('No XML string provided for decoder selection');
+    }
+    
+    const format = DecoderFactory.detectFormat(xmlString);
+    
+    switch (format) {
+      case 'XInvoice/UBL':
+        return new XInvoiceDecoder(xmlString);
+        
+      case 'FacturX/ZUGFeRD':
+      default:
+        // Default to FacturX/ZUGFeRD decoder
+        return new FacturXDecoder(xmlString);
+    }
+  }
+  
+  /**
+   * Detects the XML invoice format using string pattern matching
+   */
+  private static detectFormat(xmlString: string): string {
+    // XInvoice/UBL format
+    if (xmlString.includes('oasis:names:specification:ubl') || 
+        xmlString.includes('Invoice xmlns') ||
+        xmlString.includes('xrechnung')) {
+      return 'XInvoice/UBL';
+    }
+    
+    // ZUGFeRD/Factur-X (CII format)
+    if (xmlString.includes('CrossIndustryInvoice') || 
+        xmlString.includes('un/cefact') ||
+        xmlString.includes('rsm:')) {
+      return 'FacturX/ZUGFeRD';
+    }
+    
+    // Default to FacturX/ZUGFeRD
+    return 'FacturX/ZUGFeRD';
+  }
+}