Package edu.caltech.nanodb.functions

Class SimpleFunction

java.lang.Object

edu.caltech.nanodb.functions.Function

edu.caltech.nanodb.functions.ScalarFunction

edu.caltech.nanodb.functions.SimpleFunction

All Implemented Interfaces:

java.lang.Cloneable

Direct Known Subclasses:

Abs, ArcCos, ArcSin, ArcTan, ArcTan2, Ceil, Coalesce, Concat, Cos, Floor, Greatest, If, IfNull, Least, NullIf, Pow, ReadPerfCounter, ResetPerfCounter, Round, Sin, Sqrt, Tan

public abstract class SimpleFunction
extends ScalarFunction

Created by donnie on 12/5/13.

Constructor Summary

Constructors

Constructor	Description
SimpleFunction()

Method Summary

Modifier and Type	Method	Description
abstract java.lang.Object	evaluate(Environment env, java.util.List<Expression> args)	Evaluates the function.

Methods inherited from class edu.caltech.nanodb.functions.ScalarFunction

getReturnType

Methods inherited from class edu.caltech.nanodb.functions.Function

clone

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleFunction

public SimpleFunction()

Method Detail

evaluate

public abstract java.lang.Object evaluate(Environment env,
                                          java.util.List<Expression> args)

Evaluates the function. Should be called at runtime for every function call.

Parameters:

env - Environment, in which the arguments are evaluated

args - Arguments for this function

Returns:

The value of the function

Throws:

ExpressionException - when there is a problem with the evaluation like wrong number of arguments.