org.araneaframework.backend.list.memorybased
Interface ComparatorExpression

All Superinterfaces:

Serializable

All Known Subinterfaces:

CompositeComparatorExpression

All Known Implementing Classes:

LazyComparatorExpression, MultiComparatorExpression, NopComparatorExpression, ReverseComparatorExpression, VariableComparatorExpression

public interface ComparatorExpression

extends Serializable

Expression that compares two Variables using two VariableResolvers for evaluating these Variables.

See Also:

VariableResolver

Method Summary

int	compare(VariableResolver resolver1, VariableResolver resolver2) Returns a negative integer, zero, or a positive integer as the first Variable is less than, equal to, or greater than the second.

Method Detail

compare

public int compare(VariableResolver resolver1,
                   VariableResolver resolver2)
            throws ExpressionEvaluationException

Returns a negative integer, zero, or a positive integer as the first Variable is less than, equal to, or greater than the second.

Parameters:

resolver1 - Resolver that is used to evalute the first Variable.

resolver2 - Resolver that is used to evalute the second Variable.

Returns:

a negative integer, zero, or a positive integer as the first Variable is less than, equal to, or greater than the second.

Throws:

ExpressionEvaluationException - when the comparation fails.