Package jmri.implementation.swing

Class SwingShutDownTask

java.lang.Object

jmri.implementation.AbstractShutDownTask

jmri.implementation.swing.SwingShutDownTask

All Implemented Interfaces:

PropertyChangeListener, Runnable, Callable<Boolean>, EventListener, ShutDownTask

public class SwingShutDownTask
extends AbstractShutDownTask

Provides a base for using Swing to ask if shutdown should conditionally continue.

Sequence:

1. checkPromptNeeded determines if ready to shutdown. If so, return ready.
2. Issue a prompt, asking if the user wants to continue or do something else
3. Recheck until something decided.

If no "action" name is provided, only the continue and cancel options are shown.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) String	action
(package private) Component	component
(package private) String	warning

Constructor Summary

Constructors

Constructor	Description
SwingShutDownTask(String name, String warning, String action, Component component)	Constructor specifies the warning message and action to take

Method Summary

Modifier and Type	Method	Description
final Boolean	call()	Ask if shut down is allowed.
protected boolean	checkPromptNeeded()	Provide a subclass-specific check as to whether it's OK to shutdown.
protected void	didPrompt()	Handle the request to address a potential blocker to stopping.
protected boolean	doPrompt()	Handle the request to address a potential blocker to stopping.
void	run()	Take the necessary action.

Methods inherited from class jmri.implementation.AbstractShutDownTask

getName, isDoRun, propertyChange, setDoRun, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface jmri.ShutDownTask

runEarly

Field Details

warning

String warning

action

String action

component

Component component

Constructor Details

SwingShutDownTask

public SwingShutDownTask(String name,
 String warning,
 String action,
 Component component)

Constructor specifies the warning message and action to take

Parameters:

name - the name of the task (used in logs)

warning - the prompt to display

action - the action button to display

component - the parent component of the dialog

Method Details

call

public final Boolean call()

Ask if shut down is allowed.

The shut down manager calls this method first on all the tasks before starting to execute the method ShutDownTask.run() on the tasks.

If this method returns false on any task, the shut down process must be aborted. This implementation merely sets the "doRun" property to true, and should be overridden for any real checking. Note that overriding implementations should call AbstractShutDownTask.setDoRun(boolean) correctly. This implementation displays a dialog allowing a user continue stopping the app, abort stopping the app, or take a custom action. Closing the dialog without choosing any button is treated as aborting stopping the app.

Specified by:

call in interface Callable<Boolean>

Specified by:

call in interface ShutDownTask

Overrides:

call in class AbstractShutDownTask

Returns:

true if it is OK to shut down, false to abort shut down.

See Also:

• didPrompt()
• doPrompt()

run

public void run()

Take the necessary action. This method cannot abort the shutdown, and must not require user interaction to complete successfully. This method will be run in parallel to other ShutDownTasks. This implementation calls didPrompt() if the user took the prompt action.

checkPromptNeeded

protected boolean checkPromptNeeded()

Provide a subclass-specific check as to whether it's OK to shutdown. If not, issue a prompt before continuing. Default implementation never passes, causing message to be emitted.

Returns:

true if ready to shutdown, and no prompt needed. false to present dialog before shutdown proceeds

didPrompt

protected void didPrompt()

Handle the request to address a potential blocker to stopping. This method is called in run() and must not interact with the user.

This is a dummy implementation, intended to be overloaded.

doPrompt

protected boolean doPrompt()

Handle the request to address a potential blocker to stopping. This method is called in call() and can interact with the user.

This is a dummy implementation, intended to be overloaded.

Returns:

true if ready to shutdown, false to end shutdown