Package jmri

Interface Conditional

All Superinterfaces:
Comparable<NamedBean>, NamedBean, PropertyChangeProvider
All Known Implementing Classes:
DefaultConditional, SensorGroupConditional

public interface Conditional
extends NamedBean
A Conditional is layout control logic, consisting of a logical expression and an action.

A Conditional does not exist on its own, but is part of a Logix. The system name of each Conditional is set automatically when the conditional is created. It begins with the system name of its parent Logix. There is no Conditional Table. Conditionals are created, editted, and deleted via the Logix Table.

A Conditional has a "state", which changes depending on whether its logical expression calculates to TRUE or FALSE. The "state" may not be changed by the user. It only changes in response to changes in the "state variables" used in its logical expression.

Listeners may be set to monitor a change in the state of a conditional.


This file is part of JMRI.

JMRI is free software; you can redistribute it and/or modify it under the terms of version 2 of the GNU General Public License as published by the Free Software Foundation. See the "COPYING" file for a copy of this license.

JMRI is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.