Bugfix/fix invalid json (#39)

* Introduce DateTimeFormatter in DeviceMeasurementBuilder

This commit introduces a DateTimeFormatter within the DeviceMeasurementBuilder for accurate date-time formatting. Changes also include updated attribute naming for 'location' and 'dateObserved', adhering to the FIWARE Context Broker's supported format.

* Modify JSON formatting in Metadata class

This commit changes the JSON string formatting method in the Metadata class. The value variable is now enclosed within quotation marks, ensuring proper JSON output irrespective of the value's data type.

* Update version in pom.xml file

The version of fiware-integration-layer in the pom.xml file has been updated from 10.1.0 to 10.2.0. This update signifies a minor release with bug fixes and feature improvements.

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>de.app.5gla</groupId>
     <artifactId>fiware-integration-layer</artifactId>
-    <version>10.1.0</version>
+    <version>10.2.0</version>
 
     <name>5gLa FIWARE integration layer</name>
     <url>https://github.com/vitrum-connect/5gla-fiware-integration-layer</url>

src/main/java/de/app/fivegla/fiware/model/builder/DeviceMeasurementBuilder.java

@@ -7,6 +7,8 @@
 import de.app.fivegla.fiware.model.generic.Metadata;
 
 import java.time.Instant;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
 
 /**
@@ -16,6 +18,11 @@
 public final class DeviceMeasurementBuilder {
 
     private final DeviceMeasurement deviceMeasurement;
+    private final DateTimeFormatter formatter = DateTimeFormatter
+            // The supported format for the FIWARE Context Broker is "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'".
+            // 2017-06-17T07:21:24.238Z
+            .ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'")
+            .withZone(ZoneId.systemDefault());
 
     /**
      * The DeviceMeasurementBuilder class is responsible for building instances of the DeviceMeasurement class.
@@ -46,8 +53,9 @@ public DeviceMeasurementBuilder withId(String id) {
      */
     public DeviceMeasurementBuilder withLocation(double latitude, double longitude) {
         var attribute = new Attribute();
-        attribute.setValue("{\"type\":\"Point\",\"coordinates\":[" + longitude + "," + latitude + "]}");
+        attribute.setName("location");
         attribute.setType(FiwareTypes.GEO_POINT.getKey());
+        attribute.setValue("{\"type\":\"Point\",\"coordinates\":[" + longitude + "," + latitude + "]}");
         deviceMeasurement.setLocation(attribute);
         return this;
     }
@@ -68,9 +76,9 @@ public DeviceMeasurementBuilder withMeasurement(String name, String type, String
         measurement.setValue(value);
         var metadata = new ArrayList<Metadata>();
         var dateObservedMetadata = new Metadata();
-        dateObservedMetadata.setName("dateObservedMetadata");
+        dateObservedMetadata.setName("dateObserved");
         dateObservedMetadata.setType(FiwareTypes.DATE_TIME.getKey());
-        dateObservedMetadata.setValue(dateObservedMetadata.toString());
+        dateObservedMetadata.setValue(formatter.format(dateObserved));
         metadata.add(dateObservedMetadata);
         if (null != metadataEntries && metadataEntries.length > 0) {
             for (var metadataEntry : metadataEntries) {

src/main/java/de/app/fivegla/fiware/model/generic/Metadata.java

@@ -35,6 +35,6 @@ public class Metadata {
     private String value;
 
     public String asJson() {
-        return "{\"name\":\"" + name + "\",\"type\":\"" + type + "\",\"value\":" + value + "}";
+        return "{\"name\":\"" + name + "\",\"type\":\"" + type + "\",\"value\":\"" + value + "\"}";
     }
 }