water.exec
Class Function

java.lang.Object
  water.exec.Function

public abstract class Function
extends java.lang.Object

A class that represents the function call. Checks arguments in a proper manner using the argchecker instances and executes the function. Subclasses should only override the doEval abstract method.

Nested Class Summary

class	Function.ArgCheck
class	Function.ArgColIdent
class	Function.ArgInt
class	Function.ArgIntPositive
class	Function.ArgScalar
class	Function.ArgString
class	Function.ArgValue
class	Function.ArgVector

Field Summary

java.lang.String	_name
static java.util.HashMap<java.lang.String,Function>	FUNCTIONS

Constructor Summary

Function(java.lang.String name)

Method Summary

protected void	addChecker(Function.ArgCheck checker)
int	argIndex(java.lang.String name)
Function.ArgCheck	checker(int index)
abstract Expr.Result	eval(Expr.Result... args)
static void	initializeCommonFunctions()
int	numArgs()

Methods inherited from class java.lang.Object

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

Field Detail

_name

public final java.lang.String _name

FUNCTIONS

public static final java.util.HashMap<java.lang.String,Function> FUNCTIONS

Constructor Detail

Function

public Function(java.lang.String name)

Method Detail

addChecker

protected void addChecker(Function.ArgCheck checker)

checker

public Function.ArgCheck checker(int index)

numArgs

public int numArgs()

argIndex

public int argIndex(java.lang.String name)

eval

public abstract Expr.Result eval(Expr.Result... args)
                          throws java.lang.Exception

Throws:

java.lang.Exception

initializeCommonFunctions

public static void initializeCommonFunctions()