From e45038d31a5714161dcad4719f39b526f92bb4f1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Prante?= <joergprante@gmail.com>
Date: Mon, 7 Nov 2022 18:40:46 +0100
Subject: [PATCH] fix handling of meta tags in JSON writer, clean style
 constructors, let the meta fields be appended at the end in JSON, not at the
 beginning, because it is the natural order

---
 gradle.properties                             |  2 +-
 src/main/java/org/xbib/marc/MarcRecord.java   | 12 ++-
 .../org/xbib/marc/json/MarcJsonWriter.java    | 66 +++++++------
 .../java/org/xbib/marc/ConcurrencyTest.java   |  3 +-
 .../java/org/xbib/marc/MarcRecordTest.java    |  4 +-
 src/test/java/org/xbib/marc/ZDBTest.java      |  5 +-
 .../xbib/marc/dialects/mab/MabXmlTest.java    |  4 +-
 .../xbib/marc/json/MarcJsonWriterTest.java    | 96 +++++++++++++++----
 .../dialects/mab/mabxml-example.xml.jsonl     |  6 +-
 .../org/xbib/marc/json/chabon-loc.mrc.json    |  2 +-
 .../org/xbib/marc/json/chabon.mrc.json        |  2 +-
 .../resources/org/xbib/marc/json/multi.json   |  4 +-
 .../xbib/marc/json/rism_190101037.mrc.json    |  2 +-
 .../org/xbib/marc/json/summerland.mrc.json    |  2 +-
 .../org/xbib/marc/zdbtitutf8.mrc.json         | 16 ++--
 15 files changed, 150 insertions(+), 76 deletions(-)

diff --git a/gradle.properties b/gradle.properties
index 78971fc..02abcbe 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,5 +1,5 @@
 group = org.xbib
 name = marc
-version = 2.9.4
+version = 2.9.5
 
 org.gradle.warning.mode = ALL
diff --git a/src/main/java/org/xbib/marc/MarcRecord.java b/src/main/java/org/xbib/marc/MarcRecord.java
index 4f4f930..a4873a1 100644
--- a/src/main/java/org/xbib/marc/MarcRecord.java
+++ b/src/main/java/org/xbib/marc/MarcRecord.java
@@ -447,9 +447,6 @@ public class MarcRecord implements Map<String, Object> {
     @SuppressWarnings("unchecked")
     private Map<String, Object> createMapFromMarcFields(boolean stable) {
         Map<String, Object> map = stable ? new TreeMap<>() : new LinkedHashMap<>();
-        map.put(FORMAT_TAG, format);
-        map.put(TYPE_TAG, type);
-        map.put(LEADER_TAG, recordLabel.toString());
         for (MarcField marcField : marcFields) {
             String tag = marcField.getTag();
             int repeat;
@@ -494,6 +491,15 @@ public class MarcRecord implements Map<String, Object> {
                 repeatMap.put(Integer.toString(repeat), marcField.getValue());
             }
         }
+        if (format != null) {
+            map.put(FORMAT_TAG, format);
+        }
+        if (type != null) {
+            map.put(TYPE_TAG, type);
+        }
+        if (recordLabel != null && !RecordLabel.EMPTY.equals(recordLabel)) {
+            map.put(LEADER_TAG, recordLabel.toString());
+        }
         return map;
     }
 
diff --git a/src/main/java/org/xbib/marc/json/MarcJsonWriter.java b/src/main/java/org/xbib/marc/json/MarcJsonWriter.java
index 69850db..42b67ba 100644
--- a/src/main/java/org/xbib/marc/json/MarcJsonWriter.java
+++ b/src/main/java/org/xbib/marc/json/MarcJsonWriter.java
@@ -73,7 +73,7 @@ public class MarcJsonWriter extends MarcContentHandler implements Flushable, Clo
 
     private boolean fatalErrors;
 
-    private final EnumSet<Style> style;
+    private EnumSet<Style> style;
 
     private Exception exception;
 
@@ -96,40 +96,36 @@ public class MarcJsonWriter extends MarcContentHandler implements Flushable, Clo
     private boolean top;
 
     public MarcJsonWriter(OutputStream out) {
-        this(out, EnumSet.of(Style.ARRAY));
+        this(out, DEFAULT_BUFFER_SIZE);
+        this.style = EnumSet.of(Style.ARRAY);
     }
 
-    public MarcJsonWriter(OutputStream out, EnumSet<Style> style) {
-        this(out, DEFAULT_BUFFER_SIZE, style);
-    }
-
-    public MarcJsonWriter(OutputStream out, int bufferSize, EnumSet<Style> style) {
-        this(new OutputStreamWriter(out, StandardCharsets.UTF_8), style, bufferSize);
+    public MarcJsonWriter(OutputStream out, int bufferSize) {
+        this(new OutputStreamWriter(out, StandardCharsets.UTF_8), bufferSize);
     }
 
     public MarcJsonWriter(Writer writer) {
-        this(writer, EnumSet.of(Style.ARRAY), DEFAULT_BUFFER_SIZE);
+        this(writer, DEFAULT_BUFFER_SIZE);
+        this.style = EnumSet.of(Style.ARRAY);
     }
 
-    public MarcJsonWriter(Writer writer, EnumSet<Style> style, int bufferSize) {
+    public MarcJsonWriter(Writer writer, int bufferSize) {
         this.writer = new BufferedWriter(writer, bufferSize);
         this.jsonWriter = new JsonWriter(this.writer);
         this.bufferSize = bufferSize;
-        this.style = style;
         this.lock = new ReentrantLock();
         this.builder = Marc.builder();
         this.top = true;
     }
 
     public MarcJsonWriter(String fileNamePattern, int splitlimit) throws IOException {
-        this(fileNamePattern, splitlimit, EnumSet.of(Style.LINES), DEFAULT_BUFFER_SIZE, false);
+        this(fileNamePattern, splitlimit, DEFAULT_BUFFER_SIZE, false);
+        this.style = EnumSet.of(Style.LINES);
     }
 
-    public MarcJsonWriter(String fileNamePattern, int splitlimit, EnumSet<Style> style) throws IOException {
-        this(fileNamePattern, splitlimit, style, DEFAULT_BUFFER_SIZE, false);
-    }
-
-    public MarcJsonWriter(String fileNamePattern, int splitlimit, EnumSet<Style> style, int bufferSize, boolean compress)
+    public MarcJsonWriter(String fileNamePattern,
+                          int splitlimit,
+                          int bufferSize, boolean compress)
             throws IOException {
         this.fileNameCounter = new AtomicInteger(0);
         this.fileNamePattern = fileNamePattern;
@@ -138,11 +134,15 @@ public class MarcJsonWriter extends MarcContentHandler implements Flushable, Clo
         this.lock = new ReentrantLock();
         this.builder = Marc.builder();
         this.top = true;
-        this.style = style;
         this.compress = compress;
         newWriter(fileNamePattern, fileNameCounter, bufferSize, compress);
     }
 
+    public MarcJsonWriter setStyle(EnumSet<Style> style) {
+        this.style = style;
+        return this;
+    }
+
     public MarcJsonWriter setIndex(String index, String indexType) {
         this.index = index;
         this.indexType = indexType;
@@ -312,18 +312,24 @@ public class MarcJsonWriter extends MarcContentHandler implements Flushable, Clo
             }
         }
         jsonWriter.writeObjectOpen();
-        jsonWriter.writeMemberName(FORMAT_TAG);
-        jsonWriter.writeMemberSeparator();
-        jsonWriter.writeString(marcRecord.getFormat());
-        jsonWriter.writeObjectSeparator();
-        jsonWriter.writeMemberName(TYPE_TAG);
-        jsonWriter.writeMemberSeparator();
-        jsonWriter.writeString(marcRecord.getType());
-        jsonWriter.writeObjectSeparator();
-        jsonWriter.writeMemberName(LEADER_TAG);
-        jsonWriter.writeMemberSeparator();
-        jsonWriter.writeString(marcRecord.getRecordLabel().toString());
-        jsonWriter.writeObjectSeparator();
+        if (marcRecord.getFormat() != null) {
+            jsonWriter.writeMemberName(FORMAT_TAG);
+            jsonWriter.writeMemberSeparator();
+            jsonWriter.writeString(marcRecord.getFormat());
+            jsonWriter.writeObjectSeparator();
+        }
+        if (marcRecord.getType() != null) {
+            jsonWriter.writeMemberName(TYPE_TAG);
+            jsonWriter.writeMemberSeparator();
+            jsonWriter.writeString(marcRecord.getType());
+            jsonWriter.writeObjectSeparator();
+        }
+        if (!RecordLabel.EMPTY.equals(marcRecord.getRecordLabel())) {
+            jsonWriter.writeMemberName(LEADER_TAG);
+            jsonWriter.writeMemberSeparator();
+            jsonWriter.writeString(marcRecord.getRecordLabel().toString());
+            jsonWriter.writeObjectSeparator();
+        }
         boolean fieldseparator = false;
         for (MarcField marcField : marcRecord.getFields()) {
             if (fieldseparator) {
diff --git a/src/test/java/org/xbib/marc/ConcurrencyTest.java b/src/test/java/org/xbib/marc/ConcurrencyTest.java
index 543f89e..eb58bcf 100644
--- a/src/test/java/org/xbib/marc/ConcurrencyTest.java
+++ b/src/test/java/org/xbib/marc/ConcurrencyTest.java
@@ -126,7 +126,8 @@ public class ConcurrencyTest {
         File file = File.createTempFile(s + ".", ".jsonlines");
         file.deleteOnExit();
         FileOutputStream out = new FileOutputStream(file);
-        try (MarcJsonWriter writer = new MarcJsonWriter(out, EnumSet.of(MarcJsonWriter.Style.LINES))
+        try (MarcJsonWriter writer = new MarcJsonWriter(out)
+                .setStyle(EnumSet.of(MarcJsonWriter.Style.LINES))
                 .setFormat(MarcXchangeConstants.MARCXCHANGE_FORMAT)
                 .setType(MarcXchangeConstants.BIBLIOGRAPHIC_TYPE)
         ) {
diff --git a/src/test/java/org/xbib/marc/MarcRecordTest.java b/src/test/java/org/xbib/marc/MarcRecordTest.java
index 521d5a1..c705249 100644
--- a/src/test/java/org/xbib/marc/MarcRecordTest.java
+++ b/src/test/java/org/xbib/marc/MarcRecordTest.java
@@ -64,8 +64,8 @@ public class MarcRecordTest {
                 .addField(MarcField.builder().tag("100").indicator(" ")
                         .subfield("a", "Hello").subfield("b", "World").build())
                 .buildRecord();
-        // format, type, leader, 001, 100 are in the record map
-        assertEquals(5, marcRecord.size());
+        // label, 001, 100 are in the record map
+        assertEquals(3, marcRecord.size());
         assertEquals(2, marcRecord.getFields().size());
         marcRecord = Marc.builder()
                 .lightweightRecord()
diff --git a/src/test/java/org/xbib/marc/ZDBTest.java b/src/test/java/org/xbib/marc/ZDBTest.java
index 7f5ca60..35fe152 100644
--- a/src/test/java/org/xbib/marc/ZDBTest.java
+++ b/src/test/java/org/xbib/marc/ZDBTest.java
@@ -69,12 +69,13 @@ public class ZDBTest {
     }
 
     @Test
-    public void testZDBBib() throws Exception {
+    public void testZDBBibAsJson() throws Exception {
         String s = "zdbtitutf8.mrc";
         StreamMatcher.fileMatch(getClass(), s, ".json", (inputStream, outputStream) -> {
             MarcValueTransformers marcValueTransformers = new MarcValueTransformers();
             marcValueTransformers.setMarcValueTransformer(value -> Normalizer.normalize(value, Normalizer.Form.NFC));
-            try (MarcJsonWriter writer = new MarcJsonWriter(outputStream, EnumSet.of(MarcJsonWriter.Style.LINES))
+            try (MarcJsonWriter writer = new MarcJsonWriter(outputStream)
+                    .setStyle(EnumSet.of(MarcJsonWriter.Style.LINES))
                     .setFormat(MarcXchangeConstants.MARCXCHANGE_FORMAT)
                     .setType(MarcXchangeConstants.BIBLIOGRAPHIC_TYPE)
                     .setMarcValueTransformers(marcValueTransformers)) {
diff --git a/src/test/java/org/xbib/marc/dialects/mab/MabXmlTest.java b/src/test/java/org/xbib/marc/dialects/mab/MabXmlTest.java
index f3647c4..e81d72c 100644
--- a/src/test/java/org/xbib/marc/dialects/mab/MabXmlTest.java
+++ b/src/test/java/org/xbib/marc/dialects/mab/MabXmlTest.java
@@ -56,8 +56,8 @@ public class MabXmlTest {
     public void testMabXml2JsonExample() throws Exception {
         String s = "mabxml-example.xml";
         StreamMatcher.fileMatch(getClass(), s, ".jsonl", (inputStream, outputStream) -> {
-            try (MarcJsonWriter writer = new MarcJsonWriter(outputStream,
-                    10, EnumSet.of(MarcJsonWriter.Style.ELASTICSEARCH_BULK))
+            try (MarcJsonWriter writer = new MarcJsonWriter(outputStream, 10)
+                    .setStyle(EnumSet.of(MarcJsonWriter.Style.ELASTICSEARCH_BULK))
                     .setIndex("testindex", "testtype")) {
                 MarcContentHandler contentHandler = new MabXMLContentHandler()
                         .addNamespace("http://www.ddb.de/professionell/mabxml/mabxml-1.xsd")
diff --git a/src/test/java/org/xbib/marc/json/MarcJsonWriterTest.java b/src/test/java/org/xbib/marc/json/MarcJsonWriterTest.java
index e73b6d0..898d514 100644
--- a/src/test/java/org/xbib/marc/json/MarcJsonWriterTest.java
+++ b/src/test/java/org/xbib/marc/json/MarcJsonWriterTest.java
@@ -20,12 +20,17 @@ import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.xbib.marc.StreamMatcher.assertStream;
+
+import java.io.IOException;
 import java.io.OutputStream;
+import java.io.StringWriter;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import org.junit.jupiter.api.Test;
 import org.xbib.marc.Marc;
+import org.xbib.marc.MarcField;
+import org.xbib.marc.MarcRecord;
 import org.xbib.marc.MarcRecordAdapter;
 import org.xbib.marc.MarcXchangeConstants;
 import org.xbib.marc.StreamMatcher;
@@ -35,6 +40,10 @@ import java.io.InputStream;
 import java.nio.charset.Charset;
 import java.text.Normalizer;
 import java.util.EnumSet;
+import java.util.List;
+import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 public class MarcJsonWriterTest {
 
@@ -128,7 +137,8 @@ public class MarcJsonWriterTest {
     public void testAlephPublishRecordAdapterJson() throws Exception {
         String s = "HT016424175.xml";
         StreamMatcher.fileMatch(getClass(), s, ".json", (inputStream, outputStream) -> {
-            try (MarcJsonWriter writer = new MarcJsonWriter(outputStream, EnumSet.of(MarcJsonWriter.Style.LINES))
+            try (MarcJsonWriter writer = new MarcJsonWriter(outputStream)
+                    .setStyle(EnumSet.of(MarcJsonWriter.Style.LINES))
                     .setFormat(MarcXchangeConstants.MARCXCHANGE_FORMAT)
                     .setType(MarcXchangeConstants.BIBLIOGRAPHIC_TYPE)
             ) {
@@ -165,16 +175,16 @@ public class MarcJsonWriterTest {
         }
         Path f0 = Paths.get("build/0.json");
         assertTrue(Files.exists(f0));
-        assertEquals(6015, Files.size(f0));
+        assertEquals(5931, Files.size(f0));
         Path f1 = Paths.get("build/1.json");
         assertTrue(Files.exists(f1));
-        assertEquals(7130, Files.size(f1));
+        assertEquals(7046, Files.size(f1));
         Path f2 = Paths.get("build/2.json");
         assertTrue(Files.exists(f2));
-        assertEquals(6426, Files.size(f2));
+        assertEquals(6342, Files.size(f2));
         Path f3 = Paths.get("build/3.json");
         assertTrue(Files.exists(f3));
-        assertEquals(2110, Files.size(f3));
+        assertEquals(2082, Files.size(f3));
         Path f4 = Paths.get("build/4.json");
         assertFalse(Files.exists(f4));
     }
@@ -185,8 +195,8 @@ public class MarcJsonWriterTest {
         InputStream in = getClass().getResource("/org/xbib/marc/" + s).openStream();
         MarcValueTransformers marcValueTransformers = new MarcValueTransformers();
         marcValueTransformers.setMarcValueTransformer(value -> Normalizer.normalize(value, Normalizer.Form.NFC));
-        try (MarcJsonWriter writer = new MarcJsonWriter("build/bulk%d.jsonl",
-                3, EnumSet.of(MarcJsonWriter.Style.ELASTICSEARCH_BULK))
+        try (MarcJsonWriter writer = new MarcJsonWriter("build/bulk%d.jsonl", 3)
+                .setStyle(EnumSet.of(MarcJsonWriter.Style.ELASTICSEARCH_BULK))
                 .setIndex("testindex", "testtype")) {
             writer.setMarcValueTransformers(marcValueTransformers);
             Marc.builder()
@@ -230,8 +240,8 @@ public class MarcJsonWriterTest {
         MarcValueTransformers marcValueTransformers = new MarcValueTransformers();
         marcValueTransformers.setMarcValueTransformer(value -> Normalizer.normalize(value, Normalizer.Form.NFC));
         // split at 3, Elasticsearch bulk format, buffer size 65536, compress = true
-        try (MarcJsonWriter writer = new MarcJsonWriter("build/bulk%d.jsonl.gz",
-                3, EnumSet.of(MarcJsonWriter.Style.ELASTICSEARCH_BULK), 65536, true)
+        try (MarcJsonWriter writer = new MarcJsonWriter("build/bulk%d.jsonl.gz", 3, 65536, true)
+                .setStyle(EnumSet.of(MarcJsonWriter.Style.ELASTICSEARCH_BULK))
                 .setIndex("testindex", "testtype")) {
             writer.setMarcValueTransformers(marcValueTransformers);
             Marc.builder()
@@ -249,13 +259,13 @@ public class MarcJsonWriterTest {
             assertEquals(2142, Files.size(f0));
             Path f1 = Paths.get("build/bulk1.jsonl.gz");
             assertTrue(Files.exists(f1));
-            assertEquals(2608, Files.size(f1));
+            assertEquals(2606, Files.size(f1));
             Path f2 = Paths.get("build/bulk2.jsonl.gz");
             assertTrue(Files.exists(f2));
-            assertEquals(2666, Files.size(f2));
+            assertEquals(2664, Files.size(f2));
             Path f3 = Paths.get("build/bulk3.jsonl.gz");
             assertTrue(Files.exists(f3));
-            assertEquals(1020, Files.size(f3));
+            assertEquals(1023, Files.size(f3));
             Path f4 = Paths.get("build/bulk4.jsonl.gz");
             assertFalse(Files.exists(f4));
         }
@@ -265,8 +275,8 @@ public class MarcJsonWriterTest {
     public void testBundeskunsthalle() throws Exception {
         String s = "bundeskunsthalle.xml";
         InputStream in = getClass().getResource("/org/xbib/marc/xml/" + s).openStream();
-        try (MarcJsonWriter writer = new MarcJsonWriter("build/bk-bulk%d.jsonl", 1,
-                EnumSet.of(MarcJsonWriter.Style.ELASTICSEARCH_BULK))
+        try (MarcJsonWriter writer = new MarcJsonWriter("build/bk-bulk%d.jsonl", 1)
+                .setStyle(EnumSet.of(MarcJsonWriter.Style.ELASTICSEARCH_BULK))
                 .setIndex("testindex", "testtype")) {
             Marc.builder()
                     .setFormat(MarcXchangeConstants.MARCXCHANGE_FORMAT)
@@ -282,8 +292,8 @@ public class MarcJsonWriterTest {
     @Test
     public void testJsonWriterWithMultipleInput() throws Exception {
         Path path = Files.createTempFile("multi.", ".json");
-        try (OutputStream outputStream = Files.newOutputStream(path);
-                MarcJsonWriter writer = new MarcJsonWriter(outputStream, EnumSet.of(MarcJsonWriter.Style.ARRAY))) {
+        try (MarcJsonWriter writer = new MarcJsonWriter(Files.newOutputStream(path))
+                        .setStyle(EnumSet.of(MarcJsonWriter.Style.ARRAY))) {
             writer.beginCollection();
             try (InputStream inputStream = getClass().getResource("/org/xbib/marc/summerland.mrc").openStream()) {
                 Marc.builder()
@@ -307,9 +317,9 @@ public class MarcJsonWriterTest {
                         .writeRecords();
             }
             writer.endCollection();
+        } finally {
             assertStream("multi", Files.newInputStream(path),
                     getClass().getResource("/org/xbib/marc/json/multi.json").openStream());
-        } finally {
             Files.delete(path);
         }
     }
@@ -352,7 +362,8 @@ public class MarcJsonWriterTest {
                 "test_ubl.mrc"
         }) {
             StreamMatcher.fileMatch(getClass(), s, ".json", (inputStream, outputStream) -> {
-                try (MarcJsonWriter writer = new MarcJsonWriter(outputStream, EnumSet.of(MarcJsonWriter.Style.ALLOW_DUPLICATES))) {
+                try (MarcJsonWriter writer = new MarcJsonWriter(outputStream)
+                        .setStyle(EnumSet.of(MarcJsonWriter.Style.ALLOW_DUPLICATES))) {
                     Marc.builder()
                             .setFormat(MarcXchangeConstants.MARCXCHANGE_FORMAT)
                             .setType(MarcXchangeConstants.BIBLIOGRAPHIC_TYPE)
@@ -365,4 +376,53 @@ public class MarcJsonWriterTest {
             });
         }
     }
+
+    @Test
+    public void testMarcRecordJsonFromMap() throws IOException {
+        Map<String, Object> f1 = Map.of("7_", List.of(Map.of("2", "DE-101"), Map.of("a", "010000151")));
+        Map<String, Object> f2 = Map.of("7_", List.of(Map.of("2", "DE-600"), Map.of("a", "23-1")));
+        Map<String, Object> map = Map.of("016", List.of(f1, f2));
+        MarcRecord marcRecord = MarcRecord.from(map);
+        StringWriter stringWriter = new StringWriter();
+        // read from the underlying map, effectively ignoring the MARC field created
+        try (MarcJsonWriter writer = new MarcJsonWriter(stringWriter)) {
+            writer.record(marcRecord);
+        }
+        // leader, format, type may be missing. Werdo not know if there are duplicate JSON keys or not.
+        assertEquals("{\"016\":\"[{7_=[{2=DE-101}, {a=010000151}]}, {7_=[{2=DE-600}, {a=23-1}]}]\"}", stringWriter.toString());
+    }
+
+    @Test
+    public void testMarcRecordToJsonWithAddedFields() throws IOException {
+        Map<String, Object> f1 = Map.of("7_", List.of(Map.of("2", "DE-101"), Map.of("a", "010000151")));
+        Map<String, Object> f2 = Map.of("7_", List.of(Map.of("2", "DE-600"), Map.of("a", "23-1")));
+        Map<String, Object> map = Map.of("016", List.of(f1, f2));
+        // we have a map and transfer it to the MARC record
+        MarcRecord marcRecord = MarcRecord.from(map);
+        marcRecord.getFields().add(MarcField.builder().tag("001").value("abc").build());
+        // doing the magic, create a new stable treemap from the MARC record fields, overridung our given map
+        marcRecord.rebuildMap();
+        StringWriter stringWriter = new StringWriter();
+        // read from the underlying map
+        try (MarcJsonWriter writer = new MarcJsonWriter(stringWriter)) {
+            writer.record(marcRecord);
+        }
+        assertEquals("{\"001\":[\"abc\"],\"016\":[{\"7 \":[{\"2\":\"DE-101\"},{\"a\":\"010000151\"}]},{\"7 \":[{\"2\":\"DE-600\"},{\"a\":\"23-1\"}]}]}", stringWriter.toString());
+    }
+
+    @Test
+    public void testMarcRecordJsonFromMapAllowDuplicates() throws IOException {
+        Map<String, Object> f1 = Map.of("7_", List.of(Map.of("2", "DE-101"), Map.of("a", "010000151")));
+        Map<String, Object> f2 = Map.of("7_", List.of(Map.of("2", "DE-600"), Map.of("a", "23-1")));
+        Map<String, Object> map = Map.of("016", List.of(f1, f2));
+        MarcRecord marcRecord = MarcRecord.from(map);
+        StringWriter stringWriter = new StringWriter();
+        // ALLOW_DUPLICATES reads from the fields of the MARC record
+        try (MarcJsonWriter writer = new MarcJsonWriter(stringWriter)
+                        .setStyle(EnumSet.of(MarcJsonWriter.Style.ALLOW_DUPLICATES))) {
+            writer.record(marcRecord);
+        }
+        // leader is not written if empty, format and type may be null, JSON key duplicates are allowed. The MARC field structure will be lost.
+        assertEquals("{\"016\":{\"7 \":[{\"2\":\"DE-101\"},{\"a\":\"010000151\"}]},\"016\":{\"7 \":[{\"2\":\"DE-600\"},{\"a\":\"23-1\"}]}}", stringWriter.toString());
+    }
 }
diff --git a/src/test/resources/org/xbib/marc/dialects/mab/mabxml-example.xml.jsonl b/src/test/resources/org/xbib/marc/dialects/mab/mabxml-example.xml.jsonl
index 82af1e8..3d7962e 100644
--- a/src/test/resources/org/xbib/marc/dialects/mab/mabxml-example.xml.jsonl
+++ b/src/test/resources/org/xbib/marc/dialects/mab/mabxml-example.xml.jsonl
@@ -1,6 +1,6 @@
 {"index":{"_index":"testindex","_type":"testtype","_id":"(FR-PaOEC)6bee255b-ar"}}
-{"_FORMAT":"MabXML","_TYPE":"h","_LEADER":"00000     1000000   000 ","001":["(FR-PaOEC)6bee255b-ar"],"002":["20171208"],"004":["20171208"],"020":["(FR-PaOEC)6bee255b-ar�OECD"],"025":["6bee255b-ar"],"030":["a|zuc||||||37"],"037":["ara"],"050":["||||||||g|||||"],"051":["m|||||||"],"070":["OECD","HBZ"],"078":[{"e":[{"a":["ZDB-164-UNL","ZDB-164-UNL-ebook"]}]}],"200":["OHCHR"],"331":[{" ":[]}],"334":["Elektronische Ressource"],"359":["OHCHR"],"410":["New York"],"412":["United Nations"],"425":["2017"],"433":["75 p."],"540":["ISBN 9789210579391"],"552":["10.18356/6bee255b-ar"],"652":[{"a":[{"a":"Online-Ressource"}]}],"655":[{"e":[{"u":"http://dx.doi.org/10.18356/6bee255b-ar"},{"x":"Resolving-System"}]}],"775":[{" ":[{"i":"Parallelausgabe"},{"t":"Human Rights and Traditional Justice Systems in Africa"},{"z":"9789210579377"}]}]}
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