added VelocyPack UTC_DATE parsing to Json String (ISO 8601)

Author: Mark

ChangeLog

@@ -1,6 +1,7 @@
 v4.1.2 (2016-11-xx)
 ---------------------------
 * fixed GraphEntity for ArangoDatabase.getGraphs() (field name is null)
+* added VelocyPack UTC_DATE parsing to Json String (ISO 8601)
 
 v4.1.1 (2016-11-09)
 ---------------------------

src/main/java/com/arangodb/velocypack/VPackParser.java

@@ -21,6 +21,8 @@
 package com.arangodb.velocypack;
 
 import java.io.IOException;
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
@@ -40,6 +42,7 @@
  */
 public class VPackParser {
 
+	private static final DateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");// ISO 8601
 	private static final char OBJECT_OPEN = '{';
 	private static final char OBJECT_CLOSE = '}';
 	private static final char ARRAY_OPEN = '[';
@@ -122,6 +125,8 @@ private void parse(
 				json.append(JSONValue.toJSONString(value.getAsString()));
 			} else if (value.isNumber()) {
 				json.append(value.getAsNumber());
+			} else if (value.isDate()) {
+				json.append(JSONValue.toJSONString(DATE_FORMAT.format(value.getAsDate())));
 			} else if (value.isNull()) {
 				json.append(NULL);
 			} else {

src/test/java/com/arangodb/velocypack/VPackParserTest.java

@@ -23,6 +23,8 @@
 import static org.hamcrest.Matchers.is;
 import static org.junit.Assert.assertThat;
 
+import java.util.Date;
+
 import org.json.simple.JSONValue;
 import org.junit.Test;
 
@@ -445,4 +447,11 @@ public void deserialize(
 		assertThat(json, is("{\"a\":\"a1\",\"b\":\"b\"}"));
 	}
 
+	@Test
+	public void dateToJson() {
+		final VPackSlice vpack = new VPackBuilder().add(new Date(1478766992059L)).slice();
+		final VPackParser parser = new VPackParser();
+		assertThat(parser.toJson(vpack), is("\"2016-11-10T09:36:32.059Z\""));
+	}
+
 }