org.eigenbase.util.property
Class TriggerBase

java.lang.Object
  org.eigenbase.util.property.TriggerBase

All Implemented Interfaces:

Trigger

public class TriggerBase
extends Object
implements Trigger

Basic implementation of a trigger, which doesn't do anything.

Since:

5 July 2005

Version:

$Id: //open/dev/farrago/src/org/eigenbase/util/property/TriggerBase.java#7 $

Author:

Julian Hyde

Nested Class Summary

Nested classes/interfaces inherited from interface org.eigenbase.util.property.Trigger

Trigger.VetoRT

Field Summary

private boolean

persistent

Fields inherited from interface org.eigenbase.util.property.Trigger

PRIMARY_PHASE, SECONDARY_PHASE, TERTIARY_PHASE

Constructor Summary

TriggerBase(boolean persistent)

Method Summary

void	execute(Property property, String value) Executes the trigger, passing in the key of the property whose change triggered the execution.
boolean	isPersistent() If a Trigger is associated with a class or singleton, then it should return true because its associated object is not subject to garbage collection.
int	phase() Which phase does this Trigger belong to.

Methods inherited from class java.lang.Object

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

Field Detail

persistent

private final boolean persistent

Constructor Detail

TriggerBase

public TriggerBase(boolean persistent)

Method Detail

isPersistent

public boolean isPersistent()

Description copied from interface: Trigger

If a Trigger is associated with a class or singleton, then it should return true because its associated object is not subject to garbage collection. On the other hand, if a Trigger is associated with an object which will be garbage collected, then this method must return false so that the Trigger will be wrapped in a WeakReference and thus can itself be garbage collected.

Specified by:

isPersistent in interface Trigger

Returns:

whether trigger is persistent

phase

public int phase()

Description copied from interface: Trigger

Which phase does this Trigger belong to.

Specified by:

phase in interface Trigger

Returns:

phase trigger belongs to

execute

public void execute(Property property,
                    String value)
             throws Trigger.VetoRT

Description copied from interface: Trigger

Executes the trigger, passing in the key of the property whose change triggered the execution.

Specified by:

execute in interface Trigger

Parameters:

property - Property being changed

value - New value of property

Throws:

Trigger.VetoRT