feat: implement toJson in UnsupportedJsonValueImpl

Author: javier-godoy

src/main/java/com/flowingcode/vaadin/jsonmigration/ElementalNullNode.java

@@ -28,5 +28,10 @@ public ElementalNullNode() {
     super();
   }
 
+  @Override
+  public String toJson() {
+    return null;
+  }
+
 }
 

src/main/java/com/flowingcode/vaadin/jsonmigration/ElementalNumberNode.java

@@ -28,5 +28,14 @@ public ElementalNumberNode(double value) {
     super(value);
   }
 
+  @Override
+  public String toJson() {
+    double value = doubleValue();
+    if (value == (long) value) {
+      return String.valueOf((long) value);
+    } else {
+      return UnsupportedJsonValueImpl.super.toJson();
+    }
+  }
 }
 

src/main/java/com/flowingcode/vaadin/jsonmigration/UnsupportedJsonValueImpl.java

@@ -21,6 +21,7 @@
 
 import elemental.json.JsonType;
 import elemental.json.JsonValue;
+import tools.jackson.databind.JsonNode;
 
 interface UnsupportedJsonValueImpl extends JsonValue {
 
@@ -46,7 +47,7 @@ default JsonType getType() {
 
   @Override
   default String toJson() {
-    throw new UnsupportedOperationException();
+    return ((JsonNode) this).toString();
   }
 
   @Override