be.SIRAPRISE.server

Class StraightForwardContainsTupleStrategy

java.lang.Object

be.SIRAPRISE.server.StraightForwardContainsTupleStrategy

public class StraightForwardContainsTupleStrategy
extends java.lang.Object

Author:

Erwin

Method Summary

Methods

Modifier and Type	Method and Description
boolean	containsTuple(TupleBuffer t, be.SIRAPRISE.server.Luw luw, java.util.Map<java.lang.String,ValueBuffer> parameterValueMap) Checks whether the relation denoted by the relational expression that we are the containsTuple() strategy for, contains a given tuple.
long	getEstimatedContainsTupleCost(be.SIRAPRISE.server.Luw luw) Gets an estimate of the cost for evaluating a containsTuple() call

Methods inherited from class java.lang.Object

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

Method Detail

containsTuple

public boolean containsTuple(TupleBuffer t,
                    be.SIRAPRISE.server.Luw luw,
                    java.util.Map<java.lang.String,ValueBuffer> parameterValueMap)

Checks whether the relation denoted by the relational expression that we are the containsTuple() strategy for, contains a given tuple. Note that usage of this method is restricted to relations that have *NO* interval-typed attributes.

Parameters:

t - the tuple whose appearance in the relation value denoted by our expression is to be checked.

luw - the requesting luw.

parameterValueMap - The parameter values to take into account when "evaluating" our expression to the relation it denotes

Returns:

true if the expression encompasses the tuple, false otherwise

getEstimatedContainsTupleCost

public long getEstimatedContainsTupleCost(be.SIRAPRISE.server.Luw luw)

Gets an estimate of the cost for evaluating a containsTuple() call

Returns:

an estimate of the cost for evaluating a containsTuple() call