org.axiondb
Interface Constraint

All Superinterfaces:

Serializable

All Known Subinterfaces:

SelectableBasedConstraint

All Known Implementing Classes:

BaseConstraint, BaseSelectableBasedConstraint

public interface Constraint

extends Serializable

A database constraint, such as UNIQUE or NOT NULL.

Version:

$Revision: 1.15 $ $Date: 2004/08/27 03:21:21 $

Method Summary

boolean	evaluate(RowEvent event) Evaluate the given event under me.
String	getName() Get my name.
String	getType() Get a human-readable descrption of the type of constraint I represent.
boolean	isDeferrable() Return whether or not I am deferrable.
boolean	isDeferred() Return whether or not I am deferred.
void	resolve(Database db, TableIdentifier table) Resolve any unresolved org.axiondb.Selectableidentifiers I may have.
void	setDeferrable(boolean deferrable) Set whether or not I am deferrable.
void	setDeferred(boolean deferred) Set whether or not I am deferred.
void	setName(String name) Set my name.

Method Detail

evaluate

public boolean evaluate(RowEvent event)
                 throws AxionException

Evaluate the given event under me. Returns false if the constraint I represent has been violated.

Throws:

AxionException

getName

public String getName()

Get my name.

getType

public String getType()

Get a human-readable descrption of the type of constraint I represent.

isDeferrable

public boolean isDeferrable()

Return whether or not I am deferrable.

isDeferred

public boolean isDeferred()

Return whether or not I am deferred. Deferred constraints are not evaluated until the transaction is committed.

resolve

public void resolve(Database db,
                    TableIdentifier table)
             throws AxionException

Resolve any unresolved org.axiondb.Selectableidentifiers I may have.

Throws:

AxionException

setDeferrable

public void setDeferrable(boolean deferrable)

Set whether or not I am deferrable.

setDeferred

public void setDeferred(boolean deferred)
                 throws AxionException

Set whether or not I am deferred. Deferred constraints are not evaluated until the transaction is committed. Throws an exception if I am not deferrableand deferred is true.

Throws:

AxionException

setName

public void setName(String name)

Set my name.