issrg.pba.rbac
Class TimeInterpreter

java.lang.Object
  issrg.pba.rbac.TimeInterpreter

All Implemented Interfaces:

Interpreter

public class TimeInterpreter
extends java.lang.Object
implements Interpreter

This class interprets comparisons of Time values in IF-statements.

Field Summary

protected static java.util.logging.Logger

log

Constructor Summary

protected

TimeInterpreter(int mode)

Method Summary

java.lang.String	canEvaluate(Term[] t) This method tells if the Terms can be evaluated by this interpreter.
java.lang.Object	evaluate(Environment env, Term[] t) This method evaluates the expression specified by an array of Terms, given the Environment.
static void	register() This method registers as an interpreter for specific comparison operators.

Methods inherited from class java.lang.Object

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

Field Detail

log

protected static final java.util.logging.Logger log

Constructor Detail

TimeInterpreter

protected TimeInterpreter(int mode)

Method Detail

register

public static void register()

This method registers as an interpreter for specific comparison operators.

canEvaluate

public java.lang.String canEvaluate(Term[] t)

This method tells if the Terms can be evaluated by this interpreter.

Specified by:

canEvaluate in interface Interpreter

Parameters:

t - - the array of Terms to evaluate

Returns:

Types.BOOLEAN_TYPE, if the array of Terms contains only two elements, and both are of type Time.TIME_TYPE; otherwise returns null, i.e. can't evaluate

evaluate

public java.lang.Object evaluate(Environment env,
                                 Term[] t)
                          throws EvaluationException

This method evaluates the expression specified by an array of Terms, given the Environment.

Specified by:

evaluate in interface Interpreter

Parameters:

env - - the Environment of evaluation

t - - the array of Terms, each containing the actual value; it must contain only 2 elements, both of type Time.TIME_TYPE

Returns:

Boolean, the value of which tells whether the result is true or false

Throws:

EvaluationException, - if the expression cannot be evaluated

EvaluationException