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..7fe99edf3
--- /dev/null
+++ b/metafacture-csv/src/main/java/org/metafacture/csv/CsvEncoder.java
@@ -0,0 +1,224 @@
+/*
+ * 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;
+import java.util.stream.Collectors;
+
+/**
+ * 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.
+ *
+ */
+@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;
+ }
+
+ /**
+ * Add a 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);
+ }
+
+ /**
+ * Add a 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) {
+ final List uniqueHeader = header.stream().distinct().collect(Collectors.toList());
+ writeRow(uniqueHeader);
+ 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..95f0d37d5
--- /dev/null
+++ b/metafacture-csv/src/test/java/org/metafacture/csv/CsvEncoderTest.java
@@ -0,0 +1,179 @@
+/*
+ * 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.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.metafacture.framework.ObjectReceiver;
+import org.mockito.InOrder;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+import static org.mockito.Mockito.inOrder;
+
+/**
+ * Tests for {@link CsvEncoder}.
+ *
+ * @author Pascal Christoph (dr0i)
+ */
+public final class CsvEncoderTest {
+
+ private CsvEncoder encoder;
+
+ @Mock
+ private ObjectReceiver receiver;
+
+ @Before
+ public void setup() {
+ MockitoAnnotations.initMocks(this);
+ encoder = new CsvEncoder();
+ encoder.setIncludeHeader(false);
+ encoder.setReceiver(receiver);
+ }
+
+ @After
+ public void cleanup() {
+ encoder.closeStream();
+ }
+
+ @Test
+ public void shouldReceiveSingleRecord() {
+ encoder.startRecord("1");
+ encoder.literal("column 1", "a");
+ encoder.literal("column 2", "b");
+ encoder.endRecord();
+ encoder.closeStream();
+
+ final InOrder ordered = inOrder(receiver);
+ ordered.verify(receiver).process("\"a\",\"b\"");
+ }
+
+ @Test
+ public void shouldHaveNoQuotes() {
+ encoder.setNoQuotes(true);
+ encoder.startRecord("1");
+ encoder.literal("column 1", "a");
+ encoder.literal("column 2", "b");
+ encoder.endRecord();
+ encoder.closeStream();
+
+ final InOrder ordered = inOrder(receiver);
+ ordered.verify(receiver).process("a,b");
+ }
+
+ @Test
+ public void shouldReceiveSingleRecordWithHeader() {
+ encoder.setIncludeHeader(true);
+
+ encoder.startRecord("1");
+ encoder.literal("column 1", "a");
+ encoder.literal("column 2", "b");
+ encoder.endRecord();
+ encoder.closeStream();
+
+ final InOrder ordered = inOrder(receiver);
+ ordered.verify(receiver).process("\"column 1\",\"column 2\"");
+ ordered.verify(receiver).process("\"a\",\"b\"");
+ }
+
+ @Test
+ public void shouldReceiveSingleRecordWithRecordId() {
+ encoder.setIncludeRecordId(true);
+
+ encoder.startRecord("1");
+ encoder.literal("column 1", "a");
+ encoder.literal("column 2", "b");
+ encoder.endRecord();
+ encoder.closeStream();
+
+ final InOrder ordered = inOrder(receiver);
+ ordered.verify(receiver).process("\"1\",\"a\",\"b\"");
+ }
+
+ @Test
+ public void shouldReceiveSingleRecordWithRecordIdAndHeader() {
+ encoder.setIncludeRecordId(true);
+ encoder.setIncludeHeader(true);
+
+ encoder.startRecord("1");
+ encoder.literal("column 1", "a");
+ encoder.literal("column 2", "b");
+ encoder.endRecord();
+ encoder.closeStream();
+
+ final InOrder ordered = inOrder(receiver);
+ ordered.verify(receiver).process("\"record id\",\"column 1\",\"column 2\"");
+ ordered.verify(receiver).process("\"1\",\"a\",\"b\"");
+ }
+
+ @Test
+ public void shouldReceiveThreeRows() {
+ encoder.startRecord("1");
+ encoder.literal("column 1", "a");
+ encoder.literal("column 2", "b");
+ encoder.endRecord();
+ encoder.startRecord("2");
+ encoder.literal("column 1", "c");
+ encoder.literal("column 2", "d");
+ encoder.endRecord();
+ encoder.startRecord("3");
+ encoder.literal("column 1", "e");
+ encoder.literal("column 2", "f");
+ encoder.endRecord();
+ encoder.closeStream();
+
+ final InOrder ordered = inOrder(receiver);
+ ordered.verify(receiver).process("\"a\",\"b\"");
+ ordered.verify(receiver).process("\"c\",\"d\"");
+ ordered.verify(receiver).process("\"e\",\"f\"");
+ }
+
+ @Test
+ public void shouldUseTabulatorAsSeparator() {
+ encoder.setSeparator('\t');
+
+ encoder.startRecord("1");
+ encoder.literal("column 1", "a");
+ encoder.literal("column 2", "b");
+ encoder.endRecord();
+ encoder.startRecord("2");
+ encoder.literal("column 1", "c");
+ encoder.literal("column 2", "d");
+ encoder.endRecord();
+ encoder.closeStream();
+
+ final InOrder ordered = inOrder(receiver);
+ ordered.verify(receiver).process("\"a\"\t\"b\"");
+ ordered.verify(receiver).process("\"c\"\t\"d\"");
+ }
+
+ @Test
+ public void shouldNotCreateNestedCsvInColumn() {
+ encoder.startRecord("1");
+ encoder.literal("name", "a");
+ encoder.literal("alias", "a1");
+ encoder.literal("alias", "a2");
+ encoder.literal("alias", "a3");
+ encoder.endRecord();
+ encoder.closeStream();
+
+ final InOrder ordered = inOrder(receiver);
+ ordered.verify(receiver).process("\"a\",\"a1\",\"a2\",\"a3\"");
+ }
+
+}