weka.core.expressionlanguage.weka

Class StatsHelper

java.lang.Object

weka.core.expressionlanguage.weka.StatsHelper

All Implemented Interfaces:

java.io.Serializable, VariableDeclarations

public class StatsHelper
extends java.lang.Object
implements VariableDeclarations

A helper class to expose a Stats object to a program

Exposes the following variables that correspond to Stats' fields:

• MAX
• MIN
• MEAN
• SD
• COUNT
• SUM
• SUMSQUARED

Version:

$Revision: 1000 $

Author:

Benjamin Weber ( benweber at student dot ethz dot ch )

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
StatsHelper() Construct a StatsHelper

Method Summary

Modifier and Type	Method and Description
Node	getVariable(java.lang.String name) Tries to fetch a Stats field
boolean	hasVariable(java.lang.String name) Returns whether the variable is declared
void	setStats(Stats stats) Sets the corresponding Stats object
boolean	used() Whether Stats fields are accessed in the program
boolean	used(java.lang.String name) Returns whether the Stats field is used in the program

Methods inherited from class java.lang.Object

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

Constructor Detail

StatsHelper

public StatsHelper()

Construct a StatsHelper

Method Detail

setStats

public void setStats(Stats stats)

Sets the corresponding Stats object

Parameters:

stats - the Stats object whose fields should be exposed

used

public boolean used()

Whether Stats fields are accessed in the program

This is only meaningful after compilation.

Returns:

Whether Stats fields are accessed in the program

used

public boolean used(java.lang.String name)

Returns whether the Stats field is used in the program

Must be one of the exposed variables.

This is only meaningful after compilation.

Parameters:

name - The name of the variable of the Stats field

Returns:

whether the Stats field is used in the program

hasVariable

public boolean hasVariable(java.lang.String name)

Returns whether the variable is declared

Specified by:

hasVariable in interface VariableDeclarations

Parameters:

name - name of the variable

Returns:

whether the variable has been declared

getVariable

public Node getVariable(java.lang.String name)

Tries to fetch a Stats field

The same invariant of VariableDeclaration applies here too.

Specified by:

getVariable in interface VariableDeclarations

Parameters:

name - name of the variable

Returns:

node representing the Stats field