hep.aida
Interface IEvaluator

public interface IEvaluator

User's level interface of an IEvaluator.

Author:

The AIDA team (http://aida.freehep.org/)

Method Summary

double	evaluateDouble() Evaluate the IEvaluator from the data in the current row of the ITuple it is associated to.
String	expression() Get the expression that defined the IEvaluator.
void	initialize(ITuple tuple) Initialize the IEvaluator and associate it to an ITuple.

Method Detail

initialize

public void initialize(ITuple tuple)
                throws IllegalArgumentException

Initialize the IEvaluator and associate it to an ITuple.

Parameters:

tuple - The ITuple to which the IEvaluator is sssociated.

Throws:

IllegalArgumentException - If the IEvaluator and the ITuple are not compatible.

evaluateDouble

public double evaluateDouble()
                      throws RuntimeException

Evaluate the IEvaluator from the data in the current row of the ITuple it is associated to.

Returns:

The current value of the Evaluator.

Throws:

RuntimeException - if the IEvaluator has not been initialized.

expression

public String expression()

Get the expression that defined the IEvaluator.

Returns:

The expression.