The payload includes many variations for the supported Niagara types. Our approach to accommodating this is to allow a developer or power user the ability to override specific types as they are converted to JSON.

For a small JsonSchema, the example in the jsonToolkit palette demonstrates how to use a program object[^1] to replace units:

/**
   * Allows Json types to to be overridden when placed under JsonSchema/config/overrides/
   */
  public BValue onOverride(final BValue input)
  {
    if (input instanceof BUnit)
    {
      javax.baja.units.UnitDatabase unitDB = javax.baja.units.UnitDatabase.getDefault()
      javax.baja.units.UnitDatabase.Quantity quantity = 
      unitDB.getQuantity(input.as(BUnit.class)) 
      if (quantity != null)
      {
        return BString.make(input.as(BUnit.class).getSymbol() + ":" + quantity.getName())
      }
    }

    // If we can't override the value then just return it as we found it
    return input
  }

[^1]: To improve maintainability and station loading time in the event that a program object is duplicated repeatedly, use the ProgramBuilder.

To use the program, drag this component into the Config > Overrides folder of the schema.

Figure 24.   TypeOverride component in jsonSchema

Developers could also override the doOverride(BValue value) method in their own BTypeOverride variant.