hide empty elements

library/src/main/java/org/mustangproject/Invoice.java

@@ -26,6 +26,7 @@ import java.util.Collection;
 import java.util.Date;
 import java.util.List;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
 import org.mustangproject.ZUGFeRD.*;
 import org.mustangproject.ZUGFeRD.model.DocumentCodeTypeConstants;
 
@@ -37,6 +38,7 @@ import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
  * @see IExportableTransaction if you want to implement an interface instead
  */
 @JsonIgnoreProperties(ignoreUnknown = true)
+@JsonInclude(JsonInclude.Include.NON_EMPTY)
 public class Invoice implements IExportableTransaction {
 
 	protected String documentName = null, documentCode = null, number = null, ownOrganisationFullPlaintextInfo = null, referenceNumber = null, shipToOrganisationID = null, shipToOrganisationName = null, shipToStreet = null, shipToZIP = null, shipToLocation = null, shipToCountry = null, buyerOrderReferencedDocumentID = null, invoiceReferencedDocumentID = null, buyerOrderReferencedDocumentIssueDateTime = null, ownForeignOrganisationID = null, ownOrganisationName = null, currency = null, paymentTermDescription = null;

library/src/main/java/org/mustangproject/Item.java

@@ -1,6 +1,7 @@
 package org.mustangproject;
 
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonInclude;
 import org.mustangproject.ZUGFeRD.IReferencedDocument;
 import org.mustangproject.ZUGFeRD.IZUGFeRDAllowanceCharge;
 import org.mustangproject.ZUGFeRD.IZUGFeRDExportableItem;
@@ -18,6 +19,7 @@ import java.util.Date;
  */
 
 @JsonIgnoreProperties(ignoreUnknown = true)
+@JsonInclude(JsonInclude.Include.NON_EMPTY)
 public class Item implements IZUGFeRDExportableItem {
 	protected BigDecimal price = BigDecimal.ZERO;
 	protected BigDecimal quantity;

library/src/main/java/org/mustangproject/Product.java

@@ -1,6 +1,7 @@
 package org.mustangproject;
 
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonInclude;
 import org.mustangproject.ZUGFeRD.IDesignatedProductClassification;
 import org.mustangproject.ZUGFeRD.IZUGFeRDExportableProduct;
 import org.mustangproject.util.NodeMap;
@@ -17,6 +18,8 @@ import java.util.Map;
  * describes a product, good or service used in an invoice item line
  */
 @JsonIgnoreProperties(ignoreUnknown = true)
+@JsonInclude(JsonInclude.Include.NON_EMPTY)
+
 public class Product implements IZUGFeRDExportableProduct {
 	protected String unit, name, sellerAssignedID, buyerAssignedID;
 	protected String description="";

library/src/main/java/org/mustangproject/TradeParty.java

@@ -5,6 +5,7 @@ import java.util.List;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
 import org.mustangproject.ZUGFeRD.IZUGFeRDExportableContact;
 import org.mustangproject.ZUGFeRD.IZUGFeRDExportableTradeParty;
 import org.mustangproject.ZUGFeRD.IZUGFeRDLegalOrganisation;
@@ -19,6 +20,7 @@ import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
  * A organisation, i.e. usually a company
  */
 @JsonIgnoreProperties(ignoreUnknown = true)
+@JsonInclude(JsonInclude.Include.NON_EMPTY)
 public class TradeParty implements IZUGFeRDExportableTradeParty {
 
 	protected String name, zip, street, location, country;
@@ -500,6 +502,7 @@ public class TradeParty implements IZUGFeRDExportableTradeParty {
 		return this;
 	}
 
+
 	/**
 	 * (optional)
 	 *
@@ -511,6 +514,14 @@ public class TradeParty implements IZUGFeRDExportableTradeParty {
 		return this;
 	}
 
+	/**
+	 * primarily for invoiceimporter and JSON
+	 * @return the list of sepa mandates
+	 */
+	public List<DirectDebit> getDebitDetails() {
+		return debitDetails;
+	}
+
 	@Override
 	public IZUGFeRDLegalOrganisation getLegalOrganisation() {
 		return legalOrg;
@@ -670,6 +681,7 @@ public class TradeParty implements IZUGFeRDExportableTradeParty {
 		return contact;
 	}
 
+	@JsonIgnore
 	public IZUGFeRDTradeSettlement[] getAsTradeSettlement() {
 		if (bankDetails.isEmpty() && debitDetails.isEmpty()) {
 			return null;