org.axiondb.constraints
Class NullConstraint

java.lang.Object
  org.axiondb.constraints.BaseConstraint
      org.axiondb.constraints.BaseSelectableBasedConstraint
          org.axiondb.constraints.NullConstraint

All Implemented Interfaces:

java.io.Serializable, Constraint, SelectableBasedConstraint

public class NullConstraint
extends BaseSelectableBasedConstraint

A NULL constraint, which is never violated but may be created and dropped.

Version:

$Revision: 1.10 $ $Date: 2005/12/20 18:32:46 $

See Also:

Serialized Form

Constructor Summary

NullConstraint()

NullConstraint(java.lang.String name)

Method Summary

boolean	evaluate(RowEvent event) Returns true.
boolean	evaluate(RowEvent event, RowDecorator dec) Evaluate the given event under me.
boolean	evaluate(RowIterator oldRows, RowIterator newRows, Table table)

Methods inherited from class org.axiondb.constraints.BaseSelectableBasedConstraint

addSelectable, getSelectable, getSelectableCount, getSelectableList, getSelectables, resolve

Methods inherited from class org.axiondb.constraints.BaseConstraint

getName, getType, isDeferrable, isDeferred, setDeferrable, setDeferred, setName, toArray

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.axiondb.Constraint

getName, getType, isDeferrable, isDeferred, setDeferrable, setDeferred, setName

Constructor Detail

NullConstraint

public NullConstraint()

NullConstraint

public NullConstraint(java.lang.String name)

Method Detail

evaluate

public boolean evaluate(RowEvent event)
                 throws AxionException

Returns true.

Specified by:

evaluate in interface Constraint

Specified by:

evaluate in class BaseSelectableBasedConstraint

Throws:

AxionException

evaluate

public boolean evaluate(RowEvent event,
                        RowDecorator dec)
                 throws AxionException

Description copied from interface: Constraint

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

Specified by:

evaluate in interface Constraint

Specified by:

evaluate in class BaseSelectableBasedConstraint

Throws:

AxionException

evaluate

public boolean evaluate(RowIterator oldRows,
                        RowIterator newRows,
                        Table table)
                 throws AxionException

Specified by:

evaluate in interface Constraint

Specified by:

evaluate in class BaseSelectableBasedConstraint

Throws:

AxionException