net.sf.arise.piji.fun
Class IsNullFunction

java.lang.Object
  |
  +--net.sf.arise.piji.AbstractFunction
        |
        +--net.sf.arise.piji.fun.IsNullFunction

All Implemented Interfaces:

Function

public final class IsNullFunction

extends AbstractFunction

isNull! takes a symbol and an optional numeric value, and increases the value bound to the symbol by one or the numeric value, if given

Author:

Kjetil Valstadsve

Constructor Summary

IsNullFunction(Context ctx)

Method Summary

java.lang.Object

apply(Context context, Expression[] args) Applies the function to a set of values in a given context and returns the result

Methods inherited from class net.sf.arise.piji.AbstractFunction

checkArgumentCount, checkLeaf, checkLeaf, checkList, checkList, checkString, checkString, checkSymbol, checkSymbol, checkSymbol, checkSymbol, fillContext, fillContext, getArgumentCount, getContext, getDocumentationString, isLeaf, isList, isString, isSymbol, isVararg

Methods inherited from class java.lang.Object

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

Constructor Detail

IsNullFunction

public IsNullFunction(Context ctx)

Method Detail

apply

public java.lang.Object apply(Context context,
                              Expression[] args)
                       throws java.lang.Throwable

Description copied from interface: Function

Applies the function to a set of values in a given context and returns the result

Specified by:

apply in interface Function

Specified by:

apply in class AbstractFunction

Parameters:

context - The context to apply this function in

Returns:

The result of the function applied to the arguments in the context

java.lang.Throwable