org.araneaframework.backend.list.memorybased
Interface Expression

All Superinterfaces:

Serializable

All Known Subinterfaces:

CompositeExpression

All Known Implementing Classes:

AlwaysTrueExpression, ComparableExpression, EqualsExpression, IsNullExpression, LazyExpression, LikeExpression, MultiExpression, NotExpression, ValueExpression, VariableExpression

public interface Expression

extends Serializable

Expression that returns an Object when it is evaluated.

Method Summary

Object

evaluate(VariableResolver resolver) Evaluates this Expression by returning its value.

Method Detail

evaluate

public Object evaluate(VariableResolver resolver)
                throws ExpressionEvaluationException

Evaluates this Expression by returning its value. The returned value may also be null.

Parameters:

resolver - Resolver that is used to evalute Variables.

Returns:

the value of this Expression.

Throws:

ExpressionEvaluationException - when the evaluating fails.