csheets.core.formula.lang
Class If

java.lang.Object
  csheets.core.formula.lang.If

All Implemented Interfaces:

Function

public class If
extends Object
implements Function

A function that emulates the if-then-else statement.

Author:

Einar Pehrson

Field Summary

static FunctionParameter[]

parameters The function's three parameters: condition, result and alternative

Constructor Summary

If()
Creates a new instance of the IF function.

Method Summary

Value	applyTo(Expression[] arguments) Invokes the function using the given arguments and returns the result.
String	getIdentifier() Returns the operator's string identirifer.
FunctionParameter[]	getParameters() Returns the parameters of the function.
boolean	isVarArg() Returns whether the function accepts a variable number of arguments, i.e. whether the function's parameter list is unbounded.

Methods inherited from class java.lang.Object

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

Field Detail

parameters

public static final FunctionParameter[] parameters

The function's three parameters: condition, result and alternative

Constructor Detail

If

public If()

Creates a new instance of the IF function.

Method Detail

getIdentifier

public String getIdentifier()

Description copied from interface: Function

Returns the operator's string identirifer.

Specified by:

getIdentifier in interface Function

Returns:

a string representation of the operator.

applyTo

public Value applyTo(Expression[] arguments)
              throws IllegalValueTypeException

Description copied from interface: Function

Invokes the function using the given arguments and returns the result.

Specified by:

applyTo in interface Function

Returns:

the result of the operation

Throws:

IllegalValueTypeException

getParameters

public FunctionParameter[] getParameters()

Description copied from interface: Function

Returns the parameters of the function.

Specified by:

getParameters in interface Function

Returns:

the parameters of the function

isVarArg

public boolean isVarArg()

Description copied from interface: Function

Returns whether the function accepts a variable number of arguments, i.e. whether the function's parameter list is unbounded.

Specified by:

isVarArg in interface Function

Returns:

true if the function accepts a variable number of arguments