Merge branch 'master' of github.com:ZUGFeRD/mustangproject

library/src/main/java/org/mustangproject/Exceptions/ArithmetricException.java

@@ -3,11 +3,14 @@ package org.mustangproject.Exceptions;
 import java.text.ParseException;
 
 /***
- * will be thrown if a invoice cant be reproduced numerically
+ * will be thrown if an invoice cant be reproduced numerically
  */
 public class ArithmetricException extends ParseException {
 	public ArithmetricException() {
-		super(
-			"Could not reproduce the invoice, this could mean that it could not be read properly", 0);
+		this("");
+	}
+
+	public ArithmetricException(String details) {
+		super("Could not reproduce the invoice. " + details, 0);
 	}
 }

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

@@ -38,7 +38,7 @@ import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 @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;
+	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, buyerOrderReferencedDocumentIssueDateTime = null, ownForeignOrganisationID = null, ownOrganisationName = null, currency = null, paymentTermDescription = null;
 	protected Date issueDate = null, dueDate = null, deliveryDate = null;
 	protected TradeParty sender = null, recipient = null, deliveryAddress = null, payee = null;
 	protected ArrayList<CashDiscount> cashDiscounts = null;
@@ -57,7 +57,12 @@ public class Invoice implements IExportableTransaction {
 	protected ArrayList<IZUGFeRDAllowanceCharge> Allowances = new ArrayList<>(),
 		Charges = new ArrayList<>(), LogisticsServiceCharges = new ArrayList<>();
 	protected IZUGFeRDPaymentTerms paymentTerms = null;
+
+	protected String invoiceReferencedDocumentID = null;
 	protected Date invoiceReferencedIssueDate;
+	// New field for storing Invoiced Object Identifier (BG-3)
+	protected ArrayList<ReferencedDocument> invoiceReferencedDocuments = null;
+
 	protected String specifiedProcuringProjectID = null;
 	protected String specifiedProcuringProjectName = null;
 	protected String despatchAdviceReferencedDocumentID = null;
@@ -148,6 +153,7 @@ public class Invoice implements IExportableTransaction {
 	 */
 	public Invoice setCorrection(String number) {
 		setInvoiceReferencedDocumentID(number);
+		addInvoiceReferencedDocument(new ReferencedDocument(number));
 		documentCode = DocumentCodeTypeConstants.CORRECTEDINVOICE;
 		return this;
 	}
@@ -546,6 +552,26 @@ public class Invoice implements IExportableTransaction {
 		return this;
 	}
 
+	// Getter for BG-3
+	@Override
+	public ArrayList<ReferencedDocument> getInvoiceReferencedDocuments() {
+		return invoiceReferencedDocuments;
+	}
+
+	// Setter for BG-3
+	public void setInvoiceReferencedDocuments(ArrayList<ReferencedDocument> invoiceReferencedDocuments) {
+		this.invoiceReferencedDocuments = invoiceReferencedDocuments;
+	}
+
+	// Method to add a single ReferencedDocument for BG-3
+	public Invoice addInvoiceReferencedDocument(ReferencedDocument doc) {
+		if (invoiceReferencedDocuments == null) {
+			invoiceReferencedDocuments = new ArrayList<>();
+		}
+		invoiceReferencedDocuments.add(doc);
+		return this;
+	}
+
 	@Override
 	public IZUGFeRDAllowanceCharge[] getZFAllowances() {
 		if (Allowances.isEmpty()) {

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

@@ -2,6 +2,8 @@ package org.mustangproject;
 
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonInclude;
+import java.util.Date;
+
 import org.mustangproject.ZUGFeRD.IReferencedDocument;
 import org.mustangproject.util.NodeMap;
 import org.w3c.dom.Node;
@@ -13,20 +15,33 @@ public class ReferencedDocument implements IReferencedDocument {
 	String issuerAssignedID;
 	String typeCode;
 	String referenceTypeCode;
+	Date formattedIssueDateTime;
 
 	public ReferencedDocument(String issuerAssignedID, String typeCode, String referenceTypeCode) {
-		this.issuerAssignedID = issuerAssignedID;
+		this(issuerAssignedID);
 		this.typeCode = typeCode;
 		this.referenceTypeCode = referenceTypeCode;
 	}
 
-	public ReferencedDocument(String issuerAssignedID, String referenceTypeCode) {
-		this.issuerAssignedID = issuerAssignedID;
-		this.typeCode = "916"; // additional invoice related document
-		this.referenceTypeCode = referenceTypeCode;
+	public ReferencedDocument(String issuerAssignedID, String typeCode, String referenceTypeCode, Date formattedIssueDateTime) {
+		this(issuerAssignedID, typeCode, referenceTypeCode);
+		this.formattedIssueDateTime = formattedIssueDateTime;
 	}
 
-    /***
+	public ReferencedDocument(String issuerAssignedID, String referenceTypeCode) {
+		this(issuerAssignedID, "916", referenceTypeCode); // additional invoice related document
+	}
+
+	public ReferencedDocument(String issuerAssingedID, Date formattedIssueDateTime) {
+		this(issuerAssingedID);
+		this.formattedIssueDateTime = formattedIssueDateTime;
+	}
+	
+	public ReferencedDocument(String issuerAssignedID) {
+		this.issuerAssignedID = issuerAssignedID;
+	}
+
+	/***
 	 * sets an ID assigned by the sender
 	 * @param issuerAssignedID the ID as a string :-)
 	 */
@@ -50,6 +65,15 @@ public class ReferencedDocument implements IReferencedDocument {
 		this.referenceTypeCode = referenceTypeCode;
 	}
 
+	/**
+	 * issue date of this line
+	 *
+	 * @param formattedIssueDateTime as Date
+	 */
+	public void setFormattedIssueDateTime(Date formattedIssueDateTime) {
+		this.formattedIssueDateTime = formattedIssueDateTime;
+	}
+
 	@Override
 	public String getIssuerAssignedID() {
 		return issuerAssignedID;
@@ -65,6 +89,12 @@ public class ReferencedDocument implements IReferencedDocument {
 		return referenceTypeCode;
 	}
 
+	@Override
+	public Date getFormattedIssueDateTime()
+	{
+		return formattedIssueDateTime;
+	}
+
 	public static ReferencedDocument fromNode(Node node) {
 		if (!node.hasChildNodes()) {
 			return null;
@@ -72,6 +102,7 @@ public class ReferencedDocument implements IReferencedDocument {
 		NodeMap nodes = new NodeMap(node);
 		return new ReferencedDocument(nodes.getAsStringOrNull("IssuerAssignedID", "ID"),
 			nodes.getAsStringOrNull("TypeCode", "DocumentTypeCode"),
-			nodes.getAsStringOrNull("ReferenceTypeCode"));
+			nodes.getAsStringOrNull("ReferenceTypeCode"),
+			XMLTools.tryDate(nodes.getAsStringOrNull("FormattedIssueDateTime")));
 	}
 }

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

@@ -30,11 +30,13 @@ package org.mustangproject.ZUGFeRD;
  * */
 
 import java.math.BigDecimal;
-import java.util.Date;
+import java.util.ArrayList;
+import java.util.Date; 
 import java.util.List;
 
 import org.mustangproject.FileAttachment;
 import org.mustangproject.IncludedNote;
+import org.mustangproject.ReferencedDocument;
 import org.mustangproject.ZUGFeRD.model.DocumentCodeTypeConstants;
 
 /***
@@ -424,13 +426,23 @@ public interface IExportableTransaction {
 	 *
 	 * @return the ID of the document
 	 */
+	@Deprecated
 	default String getInvoiceReferencedDocumentID() {
 		return null;
 	}
 
+	@Deprecated
 	default Date getInvoiceReferencedIssueDate() {
 		return null;
 	}
+	
+	/**
+	 * Getter for BG-3
+	 * @return list of documents
+	 */
+	default ArrayList<ReferencedDocument> getInvoiceReferencedDocuments() {
+		return null;
+	}
 
 	/**
 	 * get the issue timestamp of the BuyerOrderReferencedDocument, which sits in

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

@@ -1,5 +1,7 @@
 package org.mustangproject.ZUGFeRD;
 
+import java.util.Date;
+
 public interface IReferencedDocument {
 
 	/***
@@ -20,4 +22,12 @@ public interface IReferencedDocument {
 	 */
 	String getReferenceTypeCode();
 
+	/***
+	 * 
+	 * issue date of this line
+	 *
+	 * @return date of the issue
+	 */
+	Date getFormattedIssueDateTime();
+
 }

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

@@ -459,6 +459,19 @@ public class OXPullProvider extends ZUGFeRD2PullProvider {
 			}
 			xml += "</ram:InvoiceReferencedDocument>";
 		}
+		if (trans.getInvoiceReferencedDocuments() != null) {
+			for (var doc : trans.getInvoiceReferencedDocuments()) {
+				xml += "<ram:InvoiceReferencedDocument>"
+						+ "<ram:IssuerAssignedID>"
+						+ XMLTools.encodeXML(doc.getIssuerAssignedID()) + "</ram:IssuerAssignedID>";
+				if (doc.getFormattedIssueDateTime() != null) {
+					xml += "<ram:FormattedIssueDateTime>"
+							+ DATE.qdtFormat(doc.getFormattedIssueDateTime())
+							+ "</ram:FormattedIssueDateTime>";
+				}
+				xml += "</ram:InvoiceReferencedDocument>";
+			}
+		}
 
 		xml += "</ram:ApplicableHeaderTradeSettlement>";
 		// + " <IncludedSupplyChainTradeLineItem>"

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

@@ -4,7 +4,10 @@ import static java.math.BigDecimal.ZERO;
 
 import java.math.BigDecimal;
 import java.math.RoundingMode;
+import java.util.Arrays;
 import java.util.HashMap;
+import java.util.Objects;
+import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
 /***
@@ -91,17 +94,14 @@ public class TransactionCalculator implements IAbsoluteValueProvider {
 	}
 
 	private String getAllowanceChargeReasonForPercent(BigDecimal percent, IZUGFeRDAllowanceCharge[] charges) {
-		String res = " ";
-		if ((charges != null) && (charges.length > 0)) {
-			for (IZUGFeRDAllowanceCharge currentCharge : charges) {
-				if ((percent == null) || (currentCharge.getTaxPercent().compareTo(percent) == 0)
-					&& currentCharge.getReason() != null) {
-					res += currentCharge.getReason() + " ";
-				}
-			}
+		if (charges == null) {
+			return "";
 		}
-		res = res.substring(0, res.length() - 1);
-		return res;
+		return Arrays.stream(charges)
+			.filter(currentCharge -> (percent == null || currentCharge.getTaxPercent().compareTo(percent) == 0))
+			.map(IZUGFeRDAllowanceCharge::getReason)
+			.filter(Objects::nonNull)
+			.collect(Collectors.joining(" "));
 	}
 
 	/***

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

@@ -828,6 +828,12 @@ public class ZUGFeRD2PullProvider implements IXMLProvider {
 			if (paymentTermsDescription != null) {
 				xml += "<ram:Description>" + paymentTermsDescription + "</ram:Description>";
 			}
+			
+			if (trans.getDueDate() != null) {
+				xml += "<ram:DueDateDateTime>" // $NON-NLS-2$
+					+ DATE.udtFormat(trans.getDueDate())
+					+ "</ram:DueDateDateTime>";// 20130704
+			}
 
 			if (trans.getTradeSettlement() != null) {
 				for (final IZUGFeRDTradeSettlement payment : trans.getTradeSettlement()) {
@@ -837,12 +843,6 @@ public class ZUGFeRD2PullProvider implements IXMLProvider {
 				}
 			}
 
-			if (trans.getDueDate() != null) {
-				xml += "<ram:DueDateDateTime>" // $NON-NLS-2$
-					+ DATE.udtFormat(trans.getDueDate())
-					+ "</ram:DueDateDateTime>";// 20130704
-
-			}
 			xml += "</ram:SpecifiedTradePaymentTerms>";
 		} else {
 			xml += buildPaymentTermsXml();
@@ -893,6 +893,19 @@ public class ZUGFeRD2PullProvider implements IXMLProvider {
 			}
 			xml += "</ram:InvoiceReferencedDocument>";
 		}
+		if (trans.getInvoiceReferencedDocuments() != null) {
+			for (var doc : trans.getInvoiceReferencedDocuments()) {
+				xml += "<ram:InvoiceReferencedDocument>"
+						+ "<ram:IssuerAssignedID>"
+						+ XMLTools.encodeXML(doc.getIssuerAssignedID()) + "</ram:IssuerAssignedID>";
+				if (doc.getFormattedIssueDateTime() != null) {
+					xml += "<ram:FormattedIssueDateTime>"
+							+ DATE.qdtFormat(doc.getFormattedIssueDateTime())
+							+ "</ram:FormattedIssueDateTime>";
+				}
+				xml += "</ram:InvoiceReferencedDocument>";
+			}
+		}
 
 		xml += "</ram:ApplicableHeaderTradeSettlement>";
 		// + "<IncludedSupplyChainTradeLineItem>\n"

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

@@ -32,6 +32,9 @@ import java.nio.file.StandardOpenOption;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
 
 public class ZUGFeRDInvoiceImporter {
 
@@ -472,9 +475,11 @@ public class ZUGFeRDInvoiceImporter {
 
 		xpr = xpath.compile("//*[local-name()=\"SpecifiedTradeSettlementHeaderMonetarySummation\"]/*[local-name()=\"DuePayableAmount\"]|//*[local-name()=\"LegalMonetaryTotal\"]/*[local-name()=\"PayableAmount\"]");
 		NodeList lineDueNodes = (NodeList) xpr.evaluate(getDocument(), XPathConstants.NODESET);
+		BigDecimal duePayableAmount = null;
 		if (lineDueNodes.getLength() > 0) {
+			duePayableAmount = new BigDecimal(XMLTools.trimOrNull(lineDueNodes.item(0)));
 			if (zpp instanceof CalculatedInvoice) {
-				((CalculatedInvoice) zpp).setDuePayable(new BigDecimal(XMLTools.trimOrNull(lineDueNodes.item(0))));
+				((CalculatedInvoice) zpp).setDuePayable(duePayableAmount);
 			}
 		}
 
@@ -816,6 +821,23 @@ public class ZUGFeRDInvoiceImporter {
 		}
 		zpp.setInvoiceReferencedDocumentID(extractString("//*[local-name()=\"InvoiceReferencedDocument\"]/*[local-name()=\"IssuerAssignedID\"]|//*[local-name()=\"BillingReference\"]/*[local-name()=\"InvoiceDocumentReference\"]/*[local-name()=\"ID\"]"));
 
+		xpr = xpath.compile("//*[local-name()=\"InvoiceReferencedDocument\"]");
+		NodeList nodes = (NodeList) xpr.evaluate(getDocument(), XPathConstants.NODESET);
+
+		if (nodes.getLength() != 0) {
+			for (int i = 0; i < nodes.getLength(); i++) {
+
+				Node currentItemNode = nodes.item(i);
+				ReferencedDocument doc = ReferencedDocument.fromNode(currentItemNode);
+				if (doc != null 
+						&& (!Objects.equals(zpp.getInvoiceReferencedDocumentID(), doc.getIssuerAssignedID()) 
+						|| !Objects.equals(zpp.getInvoiceReferencedIssueDate(), doc.getFormattedIssueDateTime())))
+				{
+					zpp.addInvoiceReferencedDocument(doc);
+				}
+			}
+		}
+		
 		zpp.setOwnOrganisationName(extractString("//*[local-name()=\"SellerTradeParty\"]/*[local-name()=\"Name\"]|//*[local-name()=\"AccountingSupplierParty\"]/*[local-name()=\"Party\"]/*[local-name()=\"PartyName\"]").trim());
 
 		String rounding = extractString("//*[local-name()=\"SpecifiedTradeSettlementHeaderMonetarySummation\"]/*[local-name()=\"RoundingAmount\"]|//*[local-name()=\"LegalMonetaryTotal\"]/*[local-name()=\"Party\"]/*[local-name()=\"PayableRoundingAmount\"]");
@@ -834,7 +856,7 @@ public class ZUGFeRDInvoiceImporter {
 		}
 
 		xpr = xpath.compile("//*[local-name()=\"IncludedSupplyChainTradeLineItem\"]|//*[local-name()=\"InvoiceLine\"]");
-		NodeList nodes = (NodeList) xpr.evaluate(getDocument(), XPathConstants.NODESET);
+		nodes = (NodeList) xpr.evaluate(getDocument(), XPathConstants.NODESET);
 
 		if (nodes.getLength() != 0) {
 			for (int i = 0; i < nodes.getLength(); i++) {
@@ -938,8 +960,7 @@ public class ZUGFeRDInvoiceImporter {
 
 
 			TransactionCalculator tc = new TransactionCalculator(zpp);
-			String expectedStringTotalGross = tc.getGrandTotal()
-				.subtract(Objects.requireNonNullElse(zpp.getTotalPrepaidAmount(), BigDecimal.ZERO)).toPlainString();
+			String calculatedPayableTotal = tc.getDuePayable().toPlainString();
 			EStandard whichType;
 			try {
 				whichType = getStandard();
@@ -947,10 +968,21 @@ public class ZUGFeRDInvoiceImporter {
 				throw new StructureException("Could not find out if it's an invoice, order, or delivery advice", 0);
 			}
 
-			if ((whichType != EStandard.despatchadvice)
-				&& ((!expectedStringTotalGross.equals(XMLTools.nDigitFormat(expectedGrandTotal, 2)))
-				&& (!ignoreCalculationErrors))) {
-				throw new ArithmetricException();
+			if (whichType != EStandard.despatchadvice && !ignoreCalculationErrors) {
+				// Check calculation if document type allows it and calculation errors should not be ignored
+
+				String payableTotalFromXml = XMLTools.nDigitFormat(Objects.requireNonNullElse(duePayableAmount, expectedGrandTotal), 2);
+				if (!calculatedPayableTotal.equals(payableTotalFromXml)) {
+					String moreDetails = "";
+					try {
+						moreDetails = " with tax basis " + tc.getTaxBasis() + " and with positions " + tc.getTotal() + " = "
+							+ Stream.of(tc.trans.getZFItems())
+							.map(item -> new LineCalculator(item).getItemTotalNetAmount().toPlainString())
+							.collect(Collectors.joining(" + "));
+					} catch (Exception ignored) {
+					}
+					throw new ArithmetricException("Payable total in XML is " + payableTotalFromXml + ", but calculated total is " + calculatedPayableTotal + moreDetails);
+				}
 			}
 		}
 		return zpp;
@@ -1068,5 +1100,4 @@ public class ZUGFeRDInvoiceImporter {
 			LOGGER.error(e.getMessage(), e);
 		}
 	}
-
 }

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

@@ -20,42 +20,9 @@
  */
 package org.mustangproject.ZUGFeRD;
 
-import java.io.BufferedOutputStream;
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.io.PipedInputStream;
-import java.io.PipedOutputStream;
-import java.nio.charset.StandardCharsets;
-import java.nio.file.Files;
-import java.nio.file.Paths;
-
-import javax.xml.parsers.DocumentBuilder;
-import javax.xml.parsers.DocumentBuilderFactory;
-import javax.xml.parsers.ParserConfigurationException;
-import javax.xml.transform.Result;
-import javax.xml.transform.Source;
-import javax.xml.transform.Templates;
-import javax.xml.transform.Transformer;
-import javax.xml.transform.TransformerConfigurationException;
-import javax.xml.transform.TransformerException;
-import javax.xml.transform.TransformerFactory;
-import javax.xml.transform.URIResolver;
-import javax.xml.transform.sax.SAXResult;
-import javax.xml.transform.stream.StreamResult;
-import javax.xml.transform.stream.StreamSource;
-
-import org.apache.fop.apps.FOPException;
-import org.apache.fop.apps.FOUserAgent;
-import org.apache.fop.apps.Fop;
-import org.apache.fop.apps.FopFactory;
-import org.apache.fop.apps.FopFactoryBuilder;
+import com.helger.commons.io.stream.StreamHelper;
+import org.apache.commons.io.IOUtils;
+import org.apache.fop.apps.*;
 import org.apache.fop.apps.io.ResourceResolverFactory;
 import org.apache.fop.configuration.Configuration;
 import org.apache.fop.configuration.ConfigurationException;
@@ -65,12 +32,19 @@ import org.mustangproject.ClasspathResolverURIAdapter;
 import org.mustangproject.EStandard;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-
-import com.helger.commons.io.stream.StreamHelper;
 import org.w3c.dom.Document;
 import org.w3c.dom.Element;
 import org.xml.sax.InputSource;
-import org.xml.sax.SAXException;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.transform.*;
+import javax.xml.transform.sax.SAXResult;
+import javax.xml.transform.stream.StreamResult;
+import javax.xml.transform.stream.StreamSource;
+import java.io.*;
+import java.nio.charset.StandardCharsets;
+import java.util.Optional;
 
 public class ZUGFeRDVisualizer {
 
@@ -113,7 +87,7 @@ public class ZUGFeRDVisualizer {
 	 * @param fis inputstream (will be consumed)
 	 * @return (facturx = cii)
 	 */
-	public EStandard findOutStandardFromRootNode(InputStream fis) {
+	private EStandard findOutStandardFromRootNode(InputStream fis) {
 
 		String zf1Signature = "CrossIndustryDocument";
 		String zf2Signature = "CrossIndustryInvoice";
@@ -144,106 +118,97 @@ public class ZUGFeRDVisualizer {
 		return null;
 	}
 
-	public String visualize(String xmlFilename, Language lang)
-		throws FileNotFoundException, TransformerException, IOException, SAXException, ParserConfigurationException {
-
-		try {
-			if (mXsltPDFTemplate == null) {
-				mXsltPDFTemplate = mFactory.newTemplates(
-					new StreamSource(CLASS_LOADER.getResourceAsStream(RESOURCE_PATH + "stylesheets/xr-pdf.xsl")));
-			}
-			if (mXsltHTMLTemplate == null) {
-				mXsltHTMLTemplate = mFactory.newTemplates(new StreamSource(
-					CLASS_LOADER.getResourceAsStream(RESOURCE_PATH + "stylesheets/xrechnung-html." + lang.name().toLowerCase() + ".xsl")));
-			}
-			if (mXsltZF1HTMLTemplate == null) {
-				mXsltZF1HTMLTemplate = mFactory.newTemplates(new StreamSource(
-					CLASS_LOADER.getResourceAsStream(RESOURCE_PATH + "stylesheets/ZUGFeRD_1p0_c1p0_s1p0.xslt")));
-			}
-		} catch (TransformerConfigurationException ex) {
-			LOGGER.error("Failed to init XSLT templates", ex);
-		}
-
-		/**
-		 * *
-		 * http://www.unece.org/fileadmin/DAM/cefact/xml/XML-Naming-And-Design-Rules-V2_1.pdf
-		 * http://www.ferd-net.de/upload/Dokumente/FACTUR-X_ZUGFeRD_2p0_Teil1_Profil_EN16931_1p03.pdf
-		 * http://countwordsfree.com/xmlviewer
-		 */
+	public String visualize(String xmlFilename, Language lang) throws IOException, TransformerException {
 		FileInputStream fis = new FileInputStream(xmlFilename);
-		String fileContent = "";
-		try {
-			fileContent = new String(Files.readAllBytes(Paths.get(xmlFilename)), StandardCharsets.UTF_8);
-		} catch (IOException e2) {
-			LOGGER.error("Failed to read file content", e2);
-		}
+		return visualize(fis, lang);
+	}
 
-		ByteArrayOutputStream iaos = new ByteArrayOutputStream();
-		ByteArrayOutputStream baos = new ByteArrayOutputStream();
+	public String visualize(InputStream inputXml, Language lang) throws IOException, TransformerException {
+		initTemplates(lang);
 
-		boolean doPostProcessing = false;
+		String fileContent = new String(IOUtils.toByteArray(inputXml), StandardCharsets.UTF_8);
+		EStandard thestandard = findOutStandardFromRootNode(new ByteArrayInputStream(fileContent.getBytes(StandardCharsets.UTF_8)));
+		ByteArrayOutputStream htmlOutput = new ByteArrayOutputStream();
 
 
-		fis = new FileInputStream(xmlFilename); // fis wont reset() so re-read from beginning
-		EStandard thestandard = findOutStandardFromRootNode(fis);
-		fis = new FileInputStream(xmlFilename); // fis wont reset() so re-read from beginning
+		ByteArrayInputStream xmlContentStream = new ByteArrayInputStream(fileContent.getBytes(StandardCharsets.UTF_8));
 
 		if (thestandard == EStandard.zugferd) {
-			applyZF1XSLT(fis, baos);
+			applyZF1XSLT(xmlContentStream, htmlOutput);
+			return htmlOutput.toString(StandardCharsets.UTF_8);
 		} else if (thestandard == EStandard.facturx) {
 			//zf2 or fx
-			applyZF2XSLT(fis, iaos);
-			doPostProcessing = true;
+			applyZF2XSLT(xmlContentStream, htmlOutput);
 		} else if (thestandard == EStandard.ubl) {
 			//zf2 or fx
-			applyUBL2XSLT(fis, iaos);
-			doPostProcessing = true;
+			applyUBL2XSLT(xmlContentStream, htmlOutput);
 		} else if (thestandard == EStandard.ubl_creditnote) {
 			//zf2 or fx
-			applyUBLCreditNote2XSLT(fis, iaos);
-			doPostProcessing = true;
+			applyUBLCreditNote2XSLT(xmlContentStream, htmlOutput);
 		} else if (thestandard == EStandard.orderx) {
 			//zf2 or fx
-			applyCIO2XSLT(fis, iaos);
-			doPostProcessing = true;
+			applyCIO2XSLT(xmlContentStream, htmlOutput);
 		} else {
 			throw new IllegalArgumentException("File does not look like CII or UBL");
 		}
-		if (doPostProcessing) {
-			// take the copy of the stream and re-write it to an InputStream
-			PipedInputStream in = new PipedInputStream();
-			PipedOutputStream out;
-			try {
-				out = new PipedOutputStream(in);
-				new Thread(new Runnable() {
-					public void run() {
-						try {
-							// write the original OutputStream to the PipedOutputStream
-							// note that in order for the below method to work, you need
-							// to ensure that the data has finished writing to the
-							// ByteArrayOutputStream
-							iaos.writeTo(out);
-						} catch (IOException e) {
-							LOGGER.error("Failed to write to stream", e);
-						} finally {
-							// close the PipedOutputStream here because we're done writing data
-							// once this thread has completed its run
-							StreamHelper.close(out);
-						}
-					}
-				}).start();
-				applyXSLTToHTML(in, baos);
-			} catch (IOException e1) {
-				LOGGER.error("Failed to create HTML", e1);
-			}
-
+		Optional<InputStream> in = copyStream(htmlOutput);
+		ByteArrayOutputStream htmlOutStream = new ByteArrayOutputStream();
+		if (in.isPresent()) {
+			applyXSLTToHTML(in.get(), htmlOutStream);
 		}
 
-		return baos.toString(StandardCharsets.UTF_8);
+		return htmlOutStream.toString(StandardCharsets.UTF_8);
+	}
+
+	/**
+	 * TODO: jstaerk: why not copy with that simple call: new ByteArrayInputStream(byteArrayOutputStream.toByteArray()) ?
+	 */
+	private Optional<InputStream> copyStream(ByteArrayOutputStream byteArrayOutputStream) {
+		// take the copy of the stream and re-write it to an InputStream
+		PipedInputStream in = new PipedInputStream();
+		try {
+			PipedOutputStream out = new PipedOutputStream(in);
+			new Thread(() -> {
+				try {
+					// write the original OutputStream to the PipedOutputStream
+					// note that in order for the below method to work, you need
+					// to ensure that the data has finished writing to the
+					// ByteArrayOutputStream
+					byteArrayOutputStream.writeTo(out);
+				} catch (IOException e) {
+					LOGGER.error("Failed to write to stream", e);
+				} finally {
+					// close the PipedOutputStream here because we're done writing data
+					// once this thread has completed its run
+					StreamHelper.close(out);
+				}
+			}).start();
+		} catch (IOException e1) {
+			LOGGER.error("Failed to create HTML", e1);
+			return Optional.empty();
+		}
+		return Optional.of(in);
+	}
+
+
+	private void initTemplates(Language lang) throws TransformerConfigurationException {
+		if (mXsltXRTemplate == null) {
+			mXsltXRTemplate = mFactory.newTemplates(
+				new StreamSource(CLASS_LOADER.getResourceAsStream(RESOURCE_PATH + "stylesheets/cii-xr.xsl")));
+		}
+
+		if (mXsltHTMLTemplate == null) {
+			mXsltHTMLTemplate = mFactory.newTemplates(new StreamSource(
+				CLASS_LOADER.getResourceAsStream(RESOURCE_PATH + "stylesheets/xrechnung-html." + lang.name().toLowerCase() + ".xsl")));
+		}
+		if (mXsltZF1HTMLTemplate == null) {
+			mXsltZF1HTMLTemplate = mFactory.newTemplates(new StreamSource(
+				CLASS_LOADER.getResourceAsStream(RESOURCE_PATH + "stylesheets/ZUGFeRD_1p0_c1p0_s1p0.xslt")));
+		}
 	}
 
 	protected String toFOP(String xmlFilename)
-		throws FileNotFoundException, TransformerException {
+		throws IOException, TransformerException {
 
 		FileInputStream fis = new FileInputStream(xmlFilename);
 		EStandard theStandard = findOutStandardFromRootNode(fis);
@@ -253,8 +218,8 @@ public class ZUGFeRDVisualizer {
 	}
 
 	protected String toFOP(InputStream is, EStandard theStandard)
-		throws FileNotFoundException, TransformerException {
-			
+		throws TransformerException, IOException {
+
 		try {
 			if (mXsltPDFTemplate == null) {
 				mXsltPDFTemplate = mFactory.newTemplates(
@@ -265,7 +230,6 @@ public class ZUGFeRDVisualizer {
 		}
 
 		ByteArrayOutputStream iaos = new ByteArrayOutputStream();
-		ByteArrayOutputStream baos = new ByteArrayOutputStream();
 
 		//zf2 or fx
 		if (theStandard == EStandard.facturx) {
@@ -277,33 +241,11 @@ public class ZUGFeRDVisualizer {
 		}
 
 
-		PipedInputStream in = new PipedInputStream();
-		PipedOutputStream out;
-		try {
-			out = new PipedOutputStream(in);
-			new Thread(new Runnable() {
-				public void run() {
-					try {
-						// write the original OutputStream to the PipedOutputStream
-						// note that in order for the below method to work, you need
-						// to ensure that the data has finished writing to the
-						// ByteArrayOutputStream
-						iaos.writeTo(out);
-					} catch (IOException e) {
-						LOGGER.error("Failed to write to stream", e);
-					} finally {
-						// close the PipedOutputStream here because we're done writing data
-						// once this thread has completed its run
-						StreamHelper.close(out);
-					}
-				}
-			}).start();
-			applyXSLTToPDF(in, baos);
-		} catch (IOException e1) {
-			LOGGER.error("Failed to create PDF", e1);
+		Optional<InputStream> in = copyStream(iaos);
+		ByteArrayOutputStream baos = new ByteArrayOutputStream();
+		if (in.isPresent()) {
+			applyXSLTToPDF(in.get(), baos);
 		}
-
-
 		return baos.toString(StandardCharsets.UTF_8);
 	}
 
@@ -319,7 +261,7 @@ public class ZUGFeRDVisualizer {
 			 */
 		try {
 			result = this.toFOP(XMLinputFile.getAbsolutePath());
-		} catch (FileNotFoundException | TransformerException e) {
+		} catch (TransformerException | IOException e) {
 			LOGGER.error("Failed to apply FOP", e);
 		}
 		DefaultConfigurationBuilder cfgBuilder = new DefaultConfigurationBuilder();
@@ -373,7 +315,7 @@ public class ZUGFeRDVisualizer {
 		}
 	}
 
-	protected void applyZF2XSLT(final InputStream xmlFile, final OutputStream HTMLOutstream)
+	protected void applyZF2XSLT(final InputStream xmlFile, final OutputStream htmlOutStream)
 		throws TransformerException {
 		if (mXsltXRTemplate == null) {
 			mXsltXRTemplate = mFactory.newTemplates(
@@ -382,10 +324,10 @@ public class ZUGFeRDVisualizer {
 		}
 		Transformer transformer = mXsltXRTemplate.newTransformer();
 
-		transformer.transform(new StreamSource(xmlFile), new StreamResult(HTMLOutstream));
+		transformer.transform(new StreamSource(xmlFile), new StreamResult(htmlOutStream));
 	}
 
-	protected void applyCIO2XSLT(final InputStream xmlFile, final OutputStream HTMLOutstream)
+	protected void applyCIO2XSLT(final InputStream xmlFile, final OutputStream htmlOutstream)
 		throws TransformerException {
 		if (mXsltCIOTemplate == null) {
 			mXsltCIOTemplate = mFactory.newTemplates(
@@ -393,10 +335,10 @@ public class ZUGFeRDVisualizer {
 		}
 		Transformer transformer = mXsltCIOTemplate.newTransformer();
 
-		transformer.transform(new StreamSource(xmlFile), new StreamResult(HTMLOutstream));
+		transformer.transform(new StreamSource(xmlFile), new StreamResult(htmlOutstream));
 	}
 
-	protected void applyUBL2XSLT(final InputStream xmlFile, final OutputStream HTMLOutstream)
+	protected void applyUBL2XSLT(final InputStream xmlFile, final OutputStream htmlOutStream)
 		throws TransformerException {
 		if (mXsltUBLTemplate == null) {
 			mXsltUBLTemplate = mFactory.newTemplates(
@@ -404,10 +346,10 @@ public class ZUGFeRDVisualizer {
 		}
 		Transformer transformer = mXsltUBLTemplate.newTransformer();
 
-		transformer.transform(new StreamSource(xmlFile), new StreamResult(HTMLOutstream));
+		transformer.transform(new StreamSource(xmlFile), new StreamResult(htmlOutStream));
 	}
 
-	protected void applyUBLCreditNote2XSLT(final InputStream xmlFile, final OutputStream HTMLOutstream)
+	protected void applyUBLCreditNote2XSLT(final InputStream xmlFile, final OutputStream htmlOutStream)
 		throws TransformerException {
 		if (mXsltUBLTemplate == null) {
 			mXsltUBLTemplate = mFactory.newTemplates(
@@ -415,28 +357,30 @@ public class ZUGFeRDVisualizer {
 		}
 		Transformer transformer = mXsltUBLTemplate.newTransformer();
 
-		transformer.transform(new StreamSource(xmlFile), new StreamResult(HTMLOutstream));
+		transformer.transform(new StreamSource(xmlFile), new StreamResult(htmlOutStream));
 	}
 
-	protected void applyZF1XSLT(final InputStream xmlFile, final OutputStream HTMLOutstream)
+	protected void applyZF1XSLT(final InputStream xmlFile, final OutputStream htmlOutStream)
 		throws TransformerException {
 		Transformer transformer = mXsltZF1HTMLTemplate.newTransformer();
 
-		transformer.transform(new StreamSource(xmlFile), new StreamResult(HTMLOutstream));
+		transformer.transform(new StreamSource(xmlFile), new StreamResult(htmlOutStream));
 	}
 
-	protected void applyXSLTToHTML(final InputStream xmlFile, final OutputStream HTMLOutstream)
-		throws TransformerException {
+	protected void applyXSLTToHTML(final InputStream xmlFile, final OutputStream htmlOutStream)
+		throws TransformerException, IOException {
 		Transformer transformer = mXsltHTMLTemplate.newTransformer();
 
-		transformer.transform(new StreamSource(xmlFile), new StreamResult(HTMLOutstream));
+		transformer.transform(new StreamSource(xmlFile), new StreamResult(htmlOutStream));
+		xmlFile.close();
 	}
 
 	protected void applyXSLTToPDF(final InputStream xmlFile, final OutputStream PDFOutstream)
-		throws TransformerException {
+		throws TransformerException, IOException {
 		Transformer transformer = mXsltPDFTemplate.newTransformer();
 
 		transformer.transform(new StreamSource(xmlFile), new StreamResult(PDFOutstream));
+		xmlFile.close();
 	}
 
 	private static class ClasspathResourceURIResolver implements URIResolver {
@@ -445,7 +389,7 @@ public class ZUGFeRDVisualizer {
 		}
 
 		@Override
-		public Source resolve(String href, String base) throws TransformerException {
+		public Source resolve(String href, String base) {
 			return new StreamSource(CLASS_LOADER.getResourceAsStream(RESOURCE_PATH + "stylesheets/" + href));
 		}
 	}