type of the context argument passed to the apply method which must be implemented when implementing the CmdInterpreter.

type of the driver, conventionally named 'Driver'.

type of argument passed to the init method of Programs.

command-interpreter context, accessible from the PD's interpretCmd implementation.

extended by all context classes.

optional command-interpreter. Ensure that the implementation class has the same name:

class CmdInterpreter extends pd.CmdInterpreter {
  def apply(cmd: Serializable,
            control: Boolean,
            diName: Option[String],
            context: Context) = {
    ... return Some(serialisableResult)
    ... return None
    ... throw new CmdNotRecognisedException(cmd)
    ... throw new CmdUsageException(advice)
  }
}

Context will be tailored to the Pd variant being extended.

just allows the PD's controls GUI to share the ControlsGui name, which is required.

an instance or concrete implementation may be supplied in place of the driver, when creating a DI.

adds type-safe methods.

provides access to the PD from another DI.