diff --git a/metafacture-csv/src/main/java/org/metafacture/csv/CsvEncoder.java b/metafacture-csv/src/main/java/org/metafacture/csv/CsvEncoder.java
new file mode 100644
index 000000000..3723493db
--- /dev/null
+++ b/metafacture-csv/src/main/java/org/metafacture/csv/CsvEncoder.java
@@ -0,0 +1,220 @@
+/*
+ * Copyright 2018-2023 Deutsche Nationalbibliothek et al
+ *
+ * Licensed under the Apache License, Version 2.0 the "License";
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.metafacture.csv;
+
+import org.metafacture.framework.FluxCommand;
+import org.metafacture.framework.MetafactureException;
+import org.metafacture.framework.ObjectReceiver;
+import org.metafacture.framework.StreamReceiver;
+import org.metafacture.framework.annotations.Description;
+import org.metafacture.framework.annotations.In;
+import org.metafacture.framework.annotations.Out;
+import org.metafacture.framework.helpers.DefaultStreamPipe;
+
+import com.opencsv.CSVWriter;
+
+import java.io.IOException;
+import java.io.StringWriter;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A csv encoder that converts a record into a csv line (Default separator: {@value #DEFAULT_SEP}).
+ *
+ *
+ * Each record represents a row. Each literal value represents a column value.
+ *
+ *
+ * @author eberhardtj (j.eberhardt@dnb.de)
+ */
+@Description("Encodes each value in a record as a csv row.")
+@In(StreamReceiver.class)
+@Out(String.class)
+@FluxCommand("encode-csv")
+public class CsvEncoder extends DefaultStreamPipe> {
+ public static final char DEFAULT_SEP = CSVWriter.DEFAULT_SEPARATOR;
+ private CSVWriter csvWriter;
+ private StringWriter writer;
+ private List rowItems = new ArrayList<>();
+ private boolean isFirstRecord = true;
+ private List header = new ArrayList<>();
+ private char separator = DEFAULT_SEP;
+ private boolean noQuotes;
+ private boolean includeHeader;
+ private boolean includeRecordId;
+
+ /**
+ * Creates an instance of {@link CsvEncoder} with a given separator.
+ *
+ * @param separator to separate columns
+ */
+ public CsvEncoder(final String separator) {
+ this.separator = separator.charAt(0);
+ }
+
+ /**
+ * Creates an instance of {@link CsvEncoder} with a given separator.
+ *
+ * @param separator to separate columns
+ */
+ public CsvEncoder(final char separator) {
+ this.separator = separator;
+ }
+
+ /**
+ * Creates an instance of {@link CsvEncoder}. The default separator is
+ * {@value #DEFAULT_SEP}.
+ */
+ public CsvEncoder() {
+ }
+
+ /**
+ * Start each line with the record ID.
+ * Default is to not start each line with the record ID.
+ *
+ * @param includeRecordId true if the first column should consist of the record's ID
+ */
+ public void setIncludeRecordId(final boolean includeRecordId) {
+ this.includeRecordId = includeRecordId;
+ }
+
+ /**
+ * Add first record as a column description header.
+ * Default is to not add a column description.
+ *
+ * @param includeHeader true if the first record should act as a CSV header, otherwise false
+ */
+ public void setIncludeHeader(final boolean includeHeader) {
+ this.includeHeader = includeHeader;
+ }
+
+ /**
+ * Set the character to separate the columns.
+ * The default is {@value #DEFAULT_SEP}.
+ *
+ * @param separator set the character which separates the columns
+ */
+ public void setSeparator(final String separator) {
+ if (separator.length() > 1) {
+ throw new MetafactureException("Separator needs to be a single character.");
+ }
+ this.separator = separator.charAt(0);
+ }
+
+ /**
+ * Set the character to separate the columns.
+ * The default is {@value #DEFAULT_SEP}.
+ *
+ * @param separator set the character which separates the columns
+ */
+ public void setSeparator(final char separator) {
+ this.separator = separator;
+ }
+
+ /**
+ * Set if values should be not quoted by '"'.
+ * The default is to quote values.
+ *
+ * @param noQuotes true if no quotes should be used. Default is false.
+ */
+ public void setNoQuotes(final boolean noQuotes) {
+ this.noQuotes = noQuotes;
+ }
+
+ private void initialize() {
+ writer = new StringWriter();
+ final String emptyLineEnd = "";
+ csvWriter = new CSVWriter(writer, separator,
+ noQuotes ? CSVWriter.NO_QUOTE_CHARACTER : CSVWriter.DEFAULT_QUOTE_CHARACTER,
+ CSVWriter.DEFAULT_ESCAPE_CHARACTER, emptyLineEnd);
+ }
+
+ private String[] arrayOf(final List list) {
+ final int length = list.size();
+ return list.toArray(new String[length]);
+ }
+
+ private void resetCaches() {
+ this.rowItems = new ArrayList<>();
+ }
+
+ private void writeRow(final List rowItemsArray) {
+ final String[] row = arrayOf(rowItemsArray);
+ csvWriter.writeNext(row);
+ final String line = writer.toString();
+ getReceiver().process(line);
+ writer.getBuffer().setLength(0);
+ }
+
+ @Override
+ public void startRecord(final String identifier) {
+ if (isFirstRecord) {
+ initialize();
+ if (includeRecordId) {
+ header.add("record id");
+ }
+ }
+
+ rowItems = new ArrayList<>();
+
+ if (includeRecordId) {
+ rowItems.add(identifier);
+ }
+ }
+
+ @Override
+ public void endRecord() {
+ if (isFirstRecord) {
+ if (includeHeader) {
+ writeRow(header);
+ header.clear();
+ }
+ isFirstRecord = false;
+ }
+
+ writeRow(rowItems);
+ resetCaches();
+ }
+
+ @Override
+ public void literal(final String name, final String value) {
+ if (isFirstRecord) {
+ header.add(name);
+ }
+ rowItems.add(value);
+ }
+
+ @Override
+ public void onCloseStream() {
+ try {
+ csvWriter.close();
+ }
+ catch (final IOException e) {
+ throw new MetafactureException(e);
+ }
+ }
+
+ @Override
+ public void onResetStream() {
+ this.includeRecordId = false;
+ this.includeHeader = false;
+ this.header = new ArrayList<>();
+ this.isFirstRecord = true;
+ this.rowItems = new ArrayList<>();
+ }
+
+}
diff --git a/metafacture-csv/src/main/resources/flux-commands.properties b/metafacture-csv/src/main/resources/flux-commands.properties
index d51970343..8b55b5c67 100644
--- a/metafacture-csv/src/main/resources/flux-commands.properties
+++ b/metafacture-csv/src/main/resources/flux-commands.properties
@@ -14,3 +14,4 @@
# limitations under the License.
#
decode-csv org.metafacture.csv.CsvDecoder
+encode-csv org.metafacture.csv.CsvEncoder
diff --git a/metafacture-csv/src/test/java/org/metafacture/csv/CsvEncoderTest.java b/metafacture-csv/src/test/java/org/metafacture/csv/CsvEncoderTest.java
new file mode 100644
index 000000000..2356d1f43
--- /dev/null
+++ b/metafacture-csv/src/test/java/org/metafacture/csv/CsvEncoderTest.java
@@ -0,0 +1,191 @@
+/*
+ * Copyright 2018-2023 Deutsche Nationalbibliothek et al
+ *
+ * Licensed under the Apache License, Version 2.0 the "License";
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.metafacture.csv;
+
+import org.junit.Rule;
+import org.metafacture.framework.ObjectReceiver;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import org.mockito.InOrder;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.MockitoAnnotations;
+import org.mockito.exceptions.base.MockitoAssertionError;
+import org.mockito.junit.MockitoJUnit;
+import org.mockito.junit.MockitoRule;
+
+import java.util.Arrays;
+import java.util.function.Consumer;
+
+/**
+ * Tests for {@link CsvEncoder}.
+ *
+ * @author eberhardtj (j.eberhardt@dnb.de)
+ * @author Pascal Christoph (dr0i)
+ * @author Jens Wille
+ */
+public final class CsvEncoderTest {
+
+ @Mock
+ private ObjectReceiver receiver;
+ private static final String LITERAL1 = "column 1";
+ private static final String LITERAL2 = "column 2";
+ private static final String RECORD_ID1 = "1";
+ private static final String RECORD_ID2 = "2";
+ private static final String RECORD_ID3 = "3";
+ private static final String VALUE1 = "a";
+ private static final String VALUE2 = "b";
+ private static final String VALUE3 = "c";
+ private static final String VALUE4 = "d";
+ private static final String VALUE5 = "e";
+ private static final String VALUE6 = "f";
+
+ @Rule
+ public MockitoRule rule = MockitoJUnit.rule();
+
+ @Test
+ public void shouldReceiveSingleRecord() {
+ assertEncode(i -> {
+ i.startRecord(RECORD_ID1);
+ i.literal(LITERAL1, VALUE1);
+ i.literal(LITERAL2, VALUE2);
+ i.endRecord();
+ }, "\"a\",\"b\"");
+ }
+
+ @Test
+ public void shouldHaveNoQuotes() {
+ assertEncode(i -> {
+ i.setNoQuotes(true);
+ i.startRecord(RECORD_ID1);
+ i.literal(LITERAL1, VALUE1);
+ i.literal(LITERAL2, VALUE2);
+ i.endRecord();
+ }, "a,b");
+ }
+
+ @Test
+ public void shouldReceiveSingleRecordWithHeader() {
+ assertEncode(i -> {
+ i.setIncludeHeader(true);
+ i.startRecord(RECORD_ID1);
+ i.literal(LITERAL1, VALUE1);
+ i.literal(LITERAL2, VALUE2);
+ i.endRecord();
+ }, "\"column 1\",\"column 2\"", "\"a\",\"b\"");
+ }
+
+ @Test
+ public void shouldReceiveSingleRecordWithRecordId() {
+ assertEncode(i -> {
+ i.setIncludeRecordId(true);
+ i.startRecord(RECORD_ID1);
+ i.literal(LITERAL1, VALUE1);
+ i.literal(LITERAL2, VALUE2);
+ i.endRecord();
+ }, "\"1\",\"a\",\"b\"");
+ }
+
+ @Test
+ public void shouldReceiveSingleRecordWithRecordIdAndHeader() {
+ assertEncode(i -> {
+ i.setIncludeRecordId(true);
+ i.setIncludeHeader(true);
+ i.startRecord(RECORD_ID1);
+ i.literal(LITERAL1, VALUE1);
+ i.literal(LITERAL2, VALUE2);
+ i.endRecord();
+ }, "\"record id\",\"column 1\",\"column 2\"", "\"1\",\"a\",\"b\"");
+ }
+
+ @Test
+ public void shouldReceiveThreeRows() {
+ assertEncode(i -> {
+ i.startRecord(RECORD_ID1);
+ i.literal(LITERAL1, VALUE1);
+ i.literal(LITERAL2, VALUE2);
+ i.endRecord();
+ i.startRecord(RECORD_ID2);
+ i.literal(LITERAL1, VALUE3);
+ i.literal(LITERAL2, VALUE4);
+ i.endRecord();
+ i.startRecord(RECORD_ID3);
+ i.literal(LITERAL1, VALUE5);
+ i.literal(LITERAL2, VALUE6);
+ i.endRecord();
+ }, "\"a\",\"b\"", "\"c\",\"d\"", "\"e\",\"f\"");
+ }
+
+ @Test
+ public void shouldUseTabulatorAsSeparator() {
+ assertEncode(i -> {
+ i.setSeparator('\t');
+ i.startRecord(RECORD_ID1);
+ i.literal(LITERAL1, VALUE1);
+ i.literal(LITERAL2, VALUE2);
+ i.endRecord();
+ }, "\"a\"\t\"b\"");
+ }
+
+ @Test
+ public void shouldNotCreateNestedCsvInColumn() {
+ assertEncode(i -> {
+ i.startRecord(RECORD_ID1);
+ i.literal(LITERAL1, VALUE1);
+ i.literal(LITERAL2, VALUE2);
+ i.literal(LITERAL2, VALUE3);
+ i.literal(LITERAL2, VALUE4);
+ i.endRecord();
+ }, "\"a\",\"b\",\"c\",\"d\"");
+ }
+
+ @Test
+ public void shouldRepeatHeaderForRepeatedColumns() {
+ assertEncode(i -> {
+ i.setIncludeHeader(true);
+ i.startRecord(RECORD_ID1);
+ i.literal(LITERAL1, VALUE1);
+ i.literal(LITERAL2, VALUE2);
+ i.literal(LITERAL2, VALUE3);
+ i.literal(LITERAL1, VALUE4);
+ i.literal(LITERAL2, VALUE5);
+ i.endRecord();
+ }, "\"column 1\",\"column 2\",\"column 2\",\"column 1\",\"column 2\"", "\"a\",\"b\",\"c\",\"d\",\"e\"");
+ }
+
+ private void assertEncode(final Consumer in, final String... out) {
+ final InOrder ordered = Mockito.inOrder(receiver);
+
+ final CsvEncoder csvEncoder = new CsvEncoder();
+ csvEncoder.setReceiver(receiver);
+ in.accept(csvEncoder);
+
+ try {
+ Arrays.stream(out).forEach(s -> ordered.verify(receiver).process(s));
+
+ ordered.verifyNoMoreInteractions();
+ Mockito.verifyNoMoreInteractions(receiver);
+ }
+ catch (final MockitoAssertionError e) {
+ System.out.println(Mockito.mockingDetails(receiver).printInvocations());
+ throw e;
+ }
+
+ }
+}