add time series map keys of Instant type

content-core/src/main/java/org/xbib/content/XContentBuilder.java

@@ -762,6 +762,13 @@ public final class XContentBuilder implements ToXContent, Flushable, Closeable {
         return this;
     }
 
+    public XContentBuilder timeseriesMap(Map<Instant, Object> map) throws IOException {
+        if (map == null) {
+            return nullValue();
+        }
+        writeInstantMap(map);
+        return this;
+    }
 
     public XContentBuilder flatMap(Map<String, String> map) throws IOException {
         if (map == null) {
@@ -827,6 +834,22 @@ public final class XContentBuilder implements ToXContent, Flushable, Closeable {
         generator.writeEndObject();
     }
 
+    private void writeInstantMap(Map<Instant, Object> map) throws IOException {
+        generator.writeStartObject();
+        for (Map.Entry<Instant, Object> entry : map.entrySet()) {
+            Instant instant = entry.getKey();
+            ZonedDateTime zdt = ZonedDateTime.ofInstant(instant, ZoneId.systemDefault());
+            field(zdt.format(DateTimeFormatter.ISO_INSTANT));
+            Object value = entry.getValue();
+            if (value == null) {
+                generator.writeNull();
+            } else {
+                writeValue(value);
+            }
+        }
+        generator.writeEndObject();
+    }
+
     private void writeFlatMap(Map<String, String> map) throws IOException {
         generator.writeStartObject();
         for (Map.Entry<String, String> entry : map.entrySet()) {
@@ -887,6 +910,10 @@ public final class XContentBuilder implements ToXContent, Flushable, Closeable {
             generator.writeEndArray();
         } else if (type == byte[].class) {
             generator.writeBinary((byte[]) value);
+        } else if (value instanceof Instant) {
+            Instant instant = (Instant) value;
+            ZonedDateTime zdt = ZonedDateTime.ofInstant(instant, ZoneId.systemDefault());
+            generator.writeString(zdt.format(DateTimeFormatter.ISO_INSTANT));
         } else if (value instanceof Date) {
             Date date = (Date) value;
             Instant instant = Instant.ofEpochMilli(date.getTime());

content-core/src/test/java/org/xbib/content/XContentBuilderTest.java

@@ -10,6 +10,9 @@ import org.xbib.content.json.JsonXContent;
 import java.io.IOException;
 import java.math.BigDecimal;
 import java.math.BigInteger;
+import java.time.Instant;
+import java.time.LocalDate;
+import java.time.ZoneOffset;
 import java.util.Arrays;
 import java.util.Date;
 import java.util.Map;
@@ -149,4 +152,13 @@ public class XContentBuilderTest {
             builder.field((String) null);
         });
     }
+
+    @Test
+    public void testInstantMap() throws IOException {
+        Instant instant = LocalDate.parse("2020-10-05").atStartOfDay().toInstant(ZoneOffset.UTC);
+        Map<Instant, Object> map = Map.of(instant, "Hello world");
+        XContentBuilder builder = contentBuilder();
+        builder.timeseriesMap(map);
+        assertEquals("{\"2020-10-05T00:00:00Z\":\"Hello world\"}", builder.string());
+    }
 }

gradle.properties

@@ -1,6 +1,6 @@
 group = org.xbib
 name = content
-version = 2.5.2
+version = 2.5.3
 
 gradle.wrapper.version = 6.6.1
 xbib.net.version = 2.1.0
@@ -9,5 +9,5 @@ jackson.version = 2.11.2
 jackson.databind.version = 2.11.2
 woodstox.version = 6.2.1
 snakeyaml.version = 1.27
-mockito.version = 3.3.3
+mockito.version = 3.5.13
 asciidoclet.version = 1.5.6