Suppress pmpty nodes in output XML

library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRD2PullProvider.java

@@ -589,19 +589,19 @@ public class ZUGFeRD2PullProvider implements IXMLProvider {
 		xml += getTradePartyAsXML(trans.getRecipient(), false, false);
 		xml += "</ram:BuyerTradeParty>";
 
-		if (trans.getSellerOrderReferencedDocumentID() != null) {
+		if (trans.getSellerOrderReferencedDocumentID() != null && !trans.getSellerOrderReferencedDocumentID().trim().isEmpty()) {
 			xml += "<ram:SellerOrderReferencedDocument>"
 				+ "<ram:IssuerAssignedID>"
 				+ XMLTools.encodeXML(trans.getSellerOrderReferencedDocumentID()) + "</ram:IssuerAssignedID>"
 				+ "</ram:SellerOrderReferencedDocument>";
 		}
-		if (trans.getBuyerOrderReferencedDocumentID() != null) {
+		if (trans.getBuyerOrderReferencedDocumentID() != null && !trans.getBuyerOrderReferencedDocumentID().trim().isEmpty()) {
 			xml += "<ram:BuyerOrderReferencedDocument>"
 				+ "<ram:IssuerAssignedID>"
 				+ XMLTools.encodeXML(trans.getBuyerOrderReferencedDocumentID()) + "</ram:IssuerAssignedID>"
 				+ "</ram:BuyerOrderReferencedDocument>";
 		}
-		if (trans.getContractReferencedDocument() != null) {
+		if (trans.getContractReferencedDocument() != null && !trans.getContractReferencedDocument().trim().isEmpty()) {
 			xml += "<ram:ContractReferencedDocument>"
 				+ "<ram:IssuerAssignedID>"
 				+ XMLTools.encodeXML(trans.getContractReferencedDocument()) + "</ram:IssuerAssignedID>"
@@ -655,7 +655,7 @@ public class ZUGFeRD2PullProvider implements IXMLProvider {
 		 * "<ID>2013-51112</ID>" +
 		 * "</DeliveryNoteReferencedDocument>"
 		 */
-		if (trans.getDespatchAdviceReferencedDocumentID() != null) {
+		if (trans.getDespatchAdviceReferencedDocumentID() != null && !trans.getDespatchAdviceReferencedDocumentID().trim().isEmpty()) {
 			xml += "<ram:DespatchAdviceReferencedDocument>";
 			xml += "<ram:IssuerAssignedID>" + XMLTools.encodeXML(trans.getDespatchAdviceReferencedDocumentID()) + "</ram:IssuerAssignedID>";
 			xml += "</ram:DespatchAdviceReferencedDocument>";
@@ -888,7 +888,7 @@ public class ZUGFeRD2PullProvider implements IXMLProvider {
 		}
 		xml += "<ram:DuePayableAmount>" + currencyFormat(calc.getDuePayable()) + "</ram:DuePayableAmount>"
 			+ "</ram:SpecifiedTradeSettlementHeaderMonetarySummation>";
-		if (trans.getInvoiceReferencedDocumentID() != null) {
+		if (trans.getInvoiceReferencedDocumentID() != null && !trans.getInvoiceReferencedDocumentID().trim().isEmpty()) {
 			xml += "<ram:InvoiceReferencedDocument>"
 				+ "<ram:IssuerAssignedID>"
 				+ XMLTools.encodeXML(trans.getInvoiceReferencedDocumentID()) + "</ram:IssuerAssignedID>";

library/src/test/java/org/mustangproject/ZUGFeRD/ZF2PushTest.java

@@ -816,4 +816,51 @@ public class ZF2PushTest extends TestCase {
 		}
 	}
 
+	public void testEmptyDocumentReference() {
+		String orgname = "Test company";
+		String number = "123";
+		BigDecimal price = new BigDecimal(1.0);
+		BigDecimal qty = new BigDecimal(1.0);
+
+		ZUGFeRD2PullProvider zf2p = new ZUGFeRD2PullProvider();
+		zf2p.setProfile( Profiles.getByName( "XRechnung" ) );
+
+		Invoice i = new Invoice().setIssueDate(new Date()).setDueDate(new Date()).setDetailedDeliveryPeriod(new Date(), new Date()).setDeliveryDate(new Date())
+			.setSender(new TradeParty(orgname, "teststr", "55232", "teststadt", "DE").addTaxID("4711").addVATID("DE0815").addBankDetails(new BankDetails("DE88200800000970375700", "COBADEFFXXX")))
+			.setRecipient(new TradeParty("Franz Müller", "teststr.12", "55232", "Entenhausen", "DE").addVATID("DE0815"))
+			.setNumber(number)
+			.addItem(new Item(new Product("Testprodukt", "", "C62", new BigDecimal(19)), price, qty));
+
+		// empty strings for document id's
+		i.setSellerOrderReferencedDocumentID("")
+			.setBuyerOrderReferencedDocumentID("")
+			.setContractReferencedDocument("")
+			.setDespatchAdviceReferencedDocumentID("")
+			.setInvoiceReferencedDocumentID("");
+
+		zf2p.generateXML(i);
+		String theXML = new String(zf2p.getXML());
+
+		assertFalse(theXML.contains("<ram:SellerOrderReferencedDocument"));
+		assertFalse(theXML.contains("<ram:BuyerOrderReferencedDocument"));
+		assertFalse(theXML.contains("<ram:ContractReferencedDocument"));
+		assertFalse(theXML.contains("<ram:DespatchAdviceReferencedDocument"));
+		assertFalse(theXML.contains("<ram:InvoiceReferencedDocument"));
+
+		// effective empty strings for document id's
+		i.setSellerOrderReferencedDocumentID(" ")
+			.setBuyerOrderReferencedDocumentID("  ")
+			.setContractReferencedDocument("   ")
+			.setDespatchAdviceReferencedDocumentID("    ")
+			.setInvoiceReferencedDocumentID("     ");
+
+		zf2p.generateXML(i);
+		theXML = new String(zf2p.getXML());
+
+		assertFalse(theXML.contains("<ram:SellerOrderReferencedDocument"));
+		assertFalse(theXML.contains("<ram:BuyerOrderReferencedDocument"));
+		assertFalse(theXML.contains("<ram:ContractReferencedDocument"));
+		assertFalse(theXML.contains("<ram:DespatchAdviceReferencedDocument"));
+		assertFalse(theXML.contains("<ram:InvoiceReferencedDocument"));
+	}
 }