Fix #538: PDFValidation for PDF/A-3A always invalid

This fixes the bug where validation of actually valid PDF/A-3A files
always claimed that the PDF is "Not a PDF/A-3".
In fact, the validation was only accepting levels 3B and 3U.

validator/src/main/java/org/mustangproject/validator/PDFValidator.java

@@ -52,7 +52,7 @@ public class PDFValidator extends Validator {
 	}
 
 	private static final Logger LOGGER = LoggerFactory.getLogger(PDFValidator.class.getCanonicalName()); // log output
-	private static final PDFAFlavour[] PDF_A_3_FLAVOURS = {PDFAFlavour.PDFA_3_A, PDFAFlavour.PDFA_3_A, PDFAFlavour.PDFA_3_A};
+	private static final PDFAFlavour[] PDF_A_3_FLAVOURS = {PDFAFlavour.PDFA_3_A, PDFAFlavour.PDFA_3_B, PDFAFlavour.PDFA_3_U};
 
 	private String pdfFilename;
 
@@ -301,8 +301,10 @@ public class PDFValidator extends Validator {
 		if (!processorResult.getValidationResult().isCompliant()) {
 			context.setInvalid();
 		}
+
+		PDFAFlavour pdfaFlavourFromValidationResult = processorResult.getValidationResult().getPDFAFlavour();
 		if (Arrays.stream(PDF_A_3_FLAVOURS)
-			.anyMatch(pdfaFlavour -> processorResult.getValidationResult().getPDFAFlavour().equals(pdfaFlavour))) {
+			.noneMatch(pdfaFlavourFromValidationResult::equals)) {
 			context.addResultItem(
 				new ValidationResultItem(ESeverity.error, "Not a PDF/A-3").setSection(23).setPart(EPart.pdf));
 

validator/src/test/java/org/mustangproject/validator/ZUGFeRDValidatorTest.java

@@ -141,6 +141,17 @@ public class ZUGFeRDValidatorTest extends ResourceCase {
 
   }
 
+	public void testPDFA3AValidation() {
+		File tempFile = getResourceAsFile("zugferd_2p1_EXTENDED_PDFA-3A.pdf");
+
+		ZUGFeRDValidator zfv = new ZUGFeRDValidator();
+
+		String res = zfv.validate(tempFile.getAbsolutePath());
+
+		assertThat(res).valueByXPath("/validation/pdf/summary/@status")
+			.isEqualTo("valid");
+	}
+
 	/***
 	 * the XMLValidatorTests only cover the <xml></xml> part, this one includes the root element and
 	 * the global <summary></summary> part as well