vishnu.model.algebra
Class MixedSelection

java.lang.Object
  vishnu.model.algebra.AbstractUnaryRelation
      vishnu.model.algebra.MixedSelection

All Implemented Interfaces:

java.lang.Cloneable, Relation, Selection, UnaryRelation

public class MixedSelection
extends AbstractUnaryRelation
implements Selection, java.lang.Cloneable

Esta clase representa la operacion de seleccion del algebra relacional.

Author:

Mariano Tepper

Nested Class Summary

Nested classes/interfaces inherited from interface vishnu.model.algebra.Relation

Relation.Context, Relation.ContextNotSelectedException

Field Summary

Fields inherited from class vishnu.model.algebra.AbstractUnaryRelation

algorithm

Constructor Summary

MixedSelection(Relation p, SQLConditionalExpression c)
Crea una seleccion sobre la relacion p bajo la expresion de condicion c.

Method Summary

TableSignature	calculateSignature()
java.lang.Object	clone() Clona la relacion.
SQLConditionalExpression	conditions()
boolean	equals(java.lang.Object o)
int	hashCode()
java.lang.String	toString()

Methods inherited from class vishnu.model.algebra.AbstractUnaryRelation

algorithm, algorithm, hasChanged, perform, relation, relation, setChanged, setContext, signature

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface vishnu.model.algebra.UnaryRelation

relation, relation

Methods inherited from interface vishnu.model.algebra.Relation

algorithm, algorithm, hasChanged, perform, setChanged, setContext, signature

Constructor Detail

MixedSelection

public MixedSelection(Relation p,
                      SQLConditionalExpression c)

Crea una seleccion sobre la relacion p bajo la expresion de condicion c.

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

conditions

public SQLConditionalExpression conditions()

Specified by:

conditions in interface Selection

clone

public java.lang.Object clone()

Description copied from interface: UnaryRelation

Clona la relacion.

Specified by:

clone in interface UnaryRelation

Specified by:

clone in class AbstractUnaryRelation

calculateSignature

public TableSignature calculateSignature()
                                  throws Relation.ContextNotSelectedException

Throws:

Relation.ContextNotSelectedException

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object