jmri
Interface SensorManager

All Superinterfaces:

Manager

All Known Implementing Classes:

AbstractSensorManager, AcelaSensorManager, CbusSensorManager, InternalSensorManager, LnSensorManager, NceSensorManager, ProxySensorManager, RpsSensorManager, SerialSensorManager, SerialSensorManager, SerialSensorManager, SerialSensorManager, SerialSensorManager, SerialSensorManager, XNetSensorManager

public interface SensorManager
extends Manager

Interface for controlling sensors.

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.

Author:

Bob Jacobsen Copyright (C) 2001

Method Summary

void	dispose() Free resources when no longer used.
Sensor	getBySystemName(String s)
Sensor	getByUserName(String s)
Sensor	getSensor(String name) Locate via user name, then system name if needed.
List	getSystemNameList()
Sensor	newSensor(String systemName, String userName) Return an instance with the specified system and user names.
Sensor	provideSensor(String name) Locate via user name, then system name if needed.
void	updateAll() Requests status of all layout sensors under this Sensor Manager.

Methods inherited from interface jmri.Manager

addPropertyChangeListener, deregister, makeSystemName, register, removePropertyChangeListener, systemLetter, typeLetter

Method Detail

provideSensor

Sensor provideSensor(String name)

Locate via user name, then system name if needed. If that fails, create a new sensor: If the name is a valid system name, it will be used for the new sensor. Otherwise, the makeSystemName method will attempt to turn it into a valid system name.

Parameters:

name -

Returns:

Never null under normal circumstances

getSensor

Sensor getSensor(String name)

Locate via user name, then system name if needed. Does not create a new one if nothing found

Parameters:

name -

Returns:

null if no match found

dispose

void dispose()

Description copied from interface: Manager

Free resources when no longer used. Specifically, remove all references to and from this object, so it can be garbage-collected.

Specified by:

dispose in interface Manager

newSensor

Sensor newSensor(String systemName,
                 String userName)

Return an instance with the specified system and user names. Note that two calls with the same arguments will get the same instance; there is only one Sensor object representing a given physical turnout and therefore only one with a specific system or user name.

This will always return a valid object reference; a new object will be created if necessary. In that case:

• If a null reference is given for user name, no user name will be associated with the Sensor object created; a valid system name must be provided
• If both names are provided, the system name defines the hardware access of the desired sensor, and the user address is associated with it. The system name must be valid.

Note that it is possible to make an inconsistent request if both addresses are provided, but the given values are associated with different objects. This is a problem, and we don't have a good solution except to issue warnings. This will mostly happen if you're creating Turnouts when you should be looking them up.

Returns:

requested Sensor object (never null)

getByUserName

Sensor getByUserName(String s)

getBySystemName

Sensor getBySystemName(String s)

getSystemNameList

List getSystemNameList()

Specified by:

getSystemNameList in interface Manager

updateAll

void updateAll()

Requests status of all layout sensors under this Sensor Manager. This method may be invoked whenever the status of sensors needs to be updated from the layout, for example, when an XML configuration file is read in. Note that there is a null implementation of this method in AbstractSensorManager. This method only needs be implemented in system-specific Sensor Managers where readout of sensor status from the layout is possible.