Implemented converting CII to UBL

e-invoicing-domain/src/main/kotlin/net/codinux/invoicing/converter/EInvoiceConverter.kt

@@ -0,0 +1,41 @@
+package net.codinux.invoicing.converter
+
+import net.codinux.invoicing.creation.EInvoiceCreator
+import net.codinux.invoicing.model.Invoice
+import org.mustangproject.CII.CIIToUBL
+import java.io.File
+
+class EInvoiceConverter {
+
+    /**
+     * Converts a CII (Cross Industry Invoice) invoice, e.g. a Zugferd or Factur-X invoice, to UBL (Universal Business Language).
+     */
+    fun convertCiiToUbl(invoice: Invoice) = convertCiiToUbl(EInvoiceCreator().createXRechnungXml(invoice))
+
+    /**
+     * Converts a CII (Cross Industry Invoice) invoice, e.g. a Zugferd or Factur-X invoice, to UBL (Universal Business Language).
+     */
+    fun convertCiiToUbl(invoiceXml: String): String {
+        // TODO: extract a common method for this
+        val xmlFile = File.createTempFile("Zugferd", ".xml")
+            .also { it.writeText(invoiceXml) }
+        val ublFile = File(xmlFile.parentFile, xmlFile.nameWithoutExtension + "-ubl.xml")
+
+        convertCiiToUbl(xmlFile, ublFile)
+
+        val ubl = ublFile.readText()
+
+        xmlFile.delete()
+        ublFile.delete()
+
+        return ubl
+    }
+
+    /**
+     * Converts a CII (Cross Industry Invoice) invoice, e.g. a Zugferd or Factur-X invoice, to UBL (Universal Business Language).
+     */
+    fun convertCiiToUbl(xmlFile: File, outputFile: File) {
+        val cii2Ubl = CIIToUBL()
+        cii2Ubl.convert(xmlFile, outputFile)
+    }
+}

e-invoicing-domain/src/test/kotlin/net/codinux/invoicing/converter/EInvoiceConverterTest.kt

@@ -0,0 +1,25 @@
+package net.codinux.invoicing.converter
+
+import assertk.assertThat
+import assertk.assertions.isNotEmpty
+import net.codinux.invoicing.test.DataGenerator
+import kotlin.test.Test
+
+class EInvoiceConverterTest {
+
+    private val underTest = EInvoiceConverter()
+
+
+    @Test
+    fun convertCiiToUbl() {
+        val invoice = createInvoice()
+
+        val result = underTest.convertCiiToUbl(invoice)
+
+        assertThat(result).isNotEmpty()
+    }
+
+
+    private fun createInvoice() = DataGenerator.createInvoice()
+
+}