Add basic support for PDF/A-2 and PDF/A-3 conformance levels

[Copilot]

Description of the new Feature/Bugfix

Adds constants and supporting infrastructure for PDF/A-2 (2a, 2b, 2u) and PDF/A-3 (3a, 3b, 3u) conformance levels, needed for ZUGFeRD/Factur-X electronic invoices.

PdfWriter.java:

• New constants: PDFA2A, PDFA2B, PDFA2U, PDFA3A, PDFA3B, PDFA3U
• New methods: isPdfA2(), isPdfA3(), isPdfA()
• setPDFXConformance() sets PDF version 1.7 for PDF/A-2/3

PdfXConformanceImp.java:

• Added isPdfA2(), isPdfA3(), isPdfA() helper methods
• Updated completeInfoDictionary() and completeExtraCatalog() to exclude PDF/A-2/3 from PDF/X-specific processing

XmpWriter.java:

• Writes correct XMP metadata (pdfaid:part=2|3, pdfaid:conformance=A|B|U) for PDF/A-2/3

Usage:

PdfWriter writer = PdfWriter.getInstance(document, outputStream);
writer.setPDFXConformance(PdfWriter.PDFA3B);  // For ZUGFeRD

Note: CIDSet is intentionally NOT included for PDF/A-2+ (deprecated per spec).

Unit-Tests for the new Feature/Bugfix

• Unit-Tests added to reproduce the bug
• Unit-Tests added to the added feature

PdfAConformanceTest.java covers conformance flags, XMP metadata generation, and constant values for all new PDF/A levels.

Compatibilities Issues

None. All changes are additive. Existing PDF/A-1 and PDF/X behavior unchanged.

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Testing details

Run mvn test -pl openpdf-core -Dtest=PdfAConformanceTest to verify the new functionality.

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[sonarqubecloud]

Quality Gate passed

Issues
22 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud