orc.runtime.sites
Class PartialSite

java.lang.Object
  orc.runtime.values.Value
      orc.runtime.sites.Site
          orc.runtime.sites.PartialSite

All Implemented Interfaces:

Callable, Future

Direct Known Subclasses:

AtoB, AtoI, If, Localhost, Random

public abstract class PartialSite
extends Site

Abstract class for sites with a partial and immediate semantics: evaluate as for a total immediate site (see EvalSite), but if the evaluation returns null, the site remains silent. The site "if" is a good example. Subclasses must implement the method evaluate, which takes an argument list and returns a single value (possibly null).

Author:

dkitchin

Constructor Summary

PartialSite()

Method Summary

void	callSite(Args args, Token caller) Must be implemented by subclasses to implement the site behavior
abstract Value	evaluate(Args args)

Methods inherited from class orc.runtime.sites.Site

accept, createCall

Methods inherited from class orc.runtime.values.Value

forceArg, forceCall, head, isCons, isNil, isNone, isSome, signal, tail, untag

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PartialSite

public PartialSite()

Method Detail

callSite

public void callSite(Args args,
                     Token caller)
              throws TokenException

Description copied from class: Site

Must be implemented by subclasses to implement the site behavior

Specified by:

callSite in class Site

Parameters:

args - list of argument values

caller - where the result should be sent

Throws:

TokenException

evaluate

public abstract Value evaluate(Args args)
                        throws TokenException

Throws:

TokenException