Defining a Top-Level Object Type in Interface Style

Defining a top-level object type is a special case of defining a singleton type, with two differences: First, a top-level object type does not require a getConcept method, because its concept is self-evident (it is always TeaConcept.TOP_LEVEL). Second, TopLevelTeaObject extends the WithMembers interface, so you must implement the getMemebers method.

1. Define a class that models the managed object type. Your class must implement the interface TopLevelTeaObject. For example, when modeling a car, the top-level is the car itself.

   public class Car implements TopLevelTeaObject {
   
       public String getName() {
           // Return the name of the car instance;
           return "Car";
       }
   
       public String getDescription() {
           // Return the description of the car instance;
           return "Car";
       }
   
       public String getKey() {
           // Return the key that corresponds to the car instance;
           return "Car";
       }
   
         // These methods give the top-level object functionality 
        // that would otherwise be in the provider.
   
       public String getTypeName() {
           // Return the name of the car object type.
           return "Car";
       }
   
       public String getTypeDescription() {
           // Return the description of the car object type.
           return "Car";
       }
   
       public Collection<BaseTeaObject> getMembers() {
           	// Return the main parts of the car.
       }
   
   }

2. Register the unique instance of the class.

   CarAgentServer server = ...
   Car myCar = new Car;
   server.registerInstance(myCar);
   // Register other instances.
    ...
   server.start();

   Notice that instead of registering the provider, we register the unique instance of the car class.