it.unibz.inf.ontop.dbschema

Class ForeignKeyConstraint

java.lang.Object

it.unibz.inf.ontop.dbschema.ForeignKeyConstraint

public class ForeignKeyConstraint
extends Object

Foreign Key constraints
FOREIGN KEY (columnName (, columnName)*) REFERENCES refTableName (refColumnName (, refColumnName)*)
(a particular case of linear tuple-generating dependencies
\forall x (\exists y_1 R_1(x,y_1) \to \exists y_2 R_2(x,y_2))
where x, y_1 and y_2 are *tuples* of variables)

Author:

Roman Kontchakov

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ForeignKeyConstraint.Builder
static class	ForeignKeyConstraint.Component

Method Summary

Modifier and Type	Method and Description
static ForeignKeyConstraint.Builder	builder(DatabaseRelationDefinition relation, DatabaseRelationDefinition referencedRelation) creates a FOREIGN KEY builder
com.google.common.collect.ImmutableList<ForeignKeyConstraint.Component>	getComponents() returns the components of the foreign key constraint each component defines a map from an attribute of the relation to an attribute of the referenced relation
String	getName() returns the name of the foreign key constraint
DatabaseRelationDefinition	getReferencedRelation() returns referenced database relation
DatabaseRelationDefinition	getRelation() returns the relation with the foreign key
static ForeignKeyConstraint	of(String name, Attribute attribute, Attribute reference) creates a single-attribute foreign key
String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

builder

public static ForeignKeyConstraint.Builder builder(DatabaseRelationDefinition relation,
                                                   DatabaseRelationDefinition referencedRelation)

creates a FOREIGN KEY builder

Parameters:

relation -

referencedRelation -

Returns:

of

public static ForeignKeyConstraint of(String name,
                                      Attribute attribute,
                                      Attribute reference)

creates a single-attribute foreign key

Parameters:

name -

attribute -

reference -

Returns:

getName

public String getName()

returns the name of the foreign key constraint

Returns:

name

getComponents

public com.google.common.collect.ImmutableList<ForeignKeyConstraint.Component> getComponents()

returns the components of the foreign key constraint each component defines a map from an attribute of the relation to an attribute of the referenced relation

Returns:

getReferencedRelation

public DatabaseRelationDefinition getReferencedRelation()

returns referenced database relation

Returns:

referenced relation

getRelation

public DatabaseRelationDefinition getRelation()

returns the relation with the foreign key

Returns:

relation

toString

public String toString()

Overrides:

toString in class Object