How to use

getTypesafeValueForField

method

in

org.eclipse.hono.service.EventBusService

/**
 * Verify that the method actually returns null when the type does not match.
 */
@Test
public void testInvalidType() {
  final JsonObject device = new JsonObject().put("device-id", "someValue");
  final String stringValue = EventBusService.getTypesafeValueForField(String.class, device, "device-id");
  Assert.assertEquals("someValue", stringValue);
  final Integer intValue = EventBusService.getTypesafeValueForField(Integer.class, device, "device-id");
  Assert.assertNull(intValue);
}

/**
 * Verify that a valid type works.
 */
@Test
public void testValidType() {
  final JsonObject payload = new JsonObject()
      .put("booleanValue", true)
      .put("stringValue", "foo")
      .put("intValue", 42);
  final String stringValue = EventBusService.getTypesafeValueForField(String.class, payload, "stringValue");
  Assert.assertEquals("foo", stringValue);
  final Integer intValue = EventBusService.getTypesafeValueForField(Integer.class, payload, "intValue");
  Assert.assertEquals(Integer.valueOf(42), intValue);
  final Boolean booleanValue = EventBusService.getTypesafeValueForField(Boolean.class, payload, "booleanValue");
  Assert.assertEquals(Boolean.TRUE, booleanValue);
}

/**
 * Verify that the method returns null, when the value is null.
 */
@Test
public void testGetNull() {
  final JsonObject device = new JsonObject().put("device-id", (String) null);
  final String value = EventBusService.getTypesafeValueForField(String.class, device, "device-id");
  Assert.assertNull(value);
}