jaitools.jiffle.parser
Class ConstantLookup

java.lang.Object
  jaitools.jiffle.parser.ConstantLookup

public class ConstantLookup
extends Object

A lookup for named constants used by the Jiffle compiler.

The following constants are recognized:

 M_E     The base of natural logarithms (e)
 M_PI    Pi
 M_PI_2  Pi / 2
 M_PI_4  Pi / 4
 M_SQRT2 Squre root of 2
 

In addition, any of the following can be used for Double.NaN

 M_NaN
 M_NAN
 NaN
 NAN
 

Since:

1.1

Version:

$Id: ConstantLookup.java 1383 2011-02-10 11:22:29Z michael.bedward $

Author:

Michael Bedward

Constructor Summary

ConstantLookup()

Method Summary

static double	getValue(String name) Gets the value of a named constant.
static boolean	isDefined(String name) Checks if a constant is recognized by Jiffle.

Methods inherited from class java.lang.Object

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

Constructor Detail

ConstantLookup

public ConstantLookup()

Method Detail

isDefined

public static boolean isDefined(String name)

Checks if a constant is recognized by Jiffle.

Parameters:

name - the name

Returns:

true if the constant is recognized; false otherwise

getValue

public static double getValue(String name)

Gets the value of a named constant.

Parameters:

name - the constant

Returns:

the value

Throws:

IllegalArgumentException - if name is not recognized