TelescopeSimulator

java.lang.Object
- util.PropertyContainer
- - util.PropertyResources
  - - util.rmi.RmiPropertyContainer
    - - util.rmi.AbstractRmiListener
      - stella.rmi.AbstractRmiCasterAndListener
        
        stella.rmi.ReceiverTorso
        
        stella.rmi.GenericSimulator
        
        stella.telescope.TelescopeSimulator

All Implemented Interfaces:

Cloneable, Remote, EventListener, Caster, ErrorSending, ErrorCaster, RmiAcknowledgeCaster, RmiCommandListener, RmiDoneCaster, RmiErrorCaster, ExitCleaning, PropertySupplying, ResourceSupplying, RmiCaster, RmiEventListener, RmiListener, RmiPropertyBearing, StepInitializable
```
public class TelescopeSimulator
extends GenericSimulator
```
A telescope simulator. This simulator is based on rmi, not on socket communication which is used for STELLA. It is intended for testing scheduling, sequencing and error handling. It does the following:
- It throws command independend errors NoTelescope and RepositionTelescope. The second one is only allowed if the telescope is guiding.
- It serves the command AbortTelescope, FocusTelescope, InitTelescope, MoveTelescope, ParkTelescope, StartGuideTelescope, StopGuideTelescope, and StatusTelescope. Error as result to these commands are found in the processCommand(stella.CommandEvent, int) section. MoveTelescope and StatusTelescope spawn a TracktimeRemaining and a TelescopeStatus status-event, respectively.
- The number of acknowledge messages sent back equals the CommandEvent.getExpectedAcknowledgeNumber().
- No parameters are served or exported as the true telescope server does not support parameter serving. Nevertheless, for simulation purposes the telescope simulator uses an internal parameter cluster that must provide at least the parameters named by KEY_INITTRIGGER, KEY_GUIDETRIGGER, KEY_FOCUSVALUE, KEY_RAVALUE, KEY_DECVALUE, KEY_AZVALUE, and KEY_ALTVALUE. Note that additional parameters needed especially for the target-depending parameters must also be present in the set.

Nested Class Summary
- Nested classes/interfaces inherited from class stella.rmi.ReceiverTorso
  ReceiverTorso.CommandHandler
- Nested classes/interfaces inherited from class util.PropertyResources
  PropertyResources.Load, PropertyResources.URLResource

Field Summary

Fields
Modifier and Type	Field and Description
`private static String[]`	`ACKTIMES` The acknowledge times for the known commands.
`private static String[]`	`COMMANDS` The known command types, used for acknowledges and true dones.
`private String`	`curerror` The currently active error symbols.
`private static String`	`DEFALTVALUE` The default name of the telescope altitude value.
`private static String`	`DEFAZVALUE` The default name of the telescope azimuth value.
`private static String`	`DEFDECVALUE` The default name of the telescope dec value.
`private static String`	`DEFERRORCLASSES` The default error list.
`private static String`	`DEFERRORPROBABILITIES` The default error probabilities.
`private static String`	`DEFERRORSYMBOLS` The default error symbols to set in the status message.
`private static double`	`DEFFAILDEROT` The default of the failure probability of the focus telescope command.
`private static double`	`DEFFAILFOCUS` The default of the failure probability of the focus telescope command.
`private static double`	`DEFFAILINIT` The default of the failure probability of the init telescope command.
`private static double`	`DEFFAILMIRROR` The default of the failure probability of the focus telescope command.
`private static double`	`DEFFAILMOVE` The default of the failure probability of the move telescope command.
`private static double`	`DEFFAILOFFSET` The default of the failure probability of the focus telescope command.
`private static double`	`DEFFAILPARK` The default to the failure probability of the park telescope command.
`private static String`	`DEFFOCUSVALUE` The default name of the focus position value.
`private static String`	`DEFGUIDETRIGGER` The default name of the guiding-telescope trigger.
`private static String`	`DEFINITTRIGGER` The default name of the init-telescope trigger..
`private static String`	`DEFRAVALUE` The default name of the telescope ra value.
`private static String`	`DEFSET` The default properties of the hidden parameter set of the simulator.
`private static double`	`DEFSTARTUPALT` The startup-value of the telescope zenith distance.
`private static double`	`DEFSTARTUPAZ` The startup-value of the telescope azimuth.
`private static long`	`DEFTRACKTIMEBASE` The default to the base-time of the track-time remaining status event.
`private static double`	`DEFTRACKTIMEDIVERT` The default to the divergence of the track-time remaining status.
`private static String[]`	`DIVERT` The actual divert factors for the commands.
`private static String[]`	`DONETIMES` The actual execution times for the commands.
`static String`	`KEY_ALTVALUE` The key to the value naming altitude of the telescope.
`static String`	`KEY_AZVALUE` The key to the value naming azimuth of the telescope.
`static String`	`KEY_DECVALUE` The key to the value naming the dec of the telescope.
`static String`	`KEY_ERRORSYMBOLS` The key to the error sysmbols to set in the status message.
`static String`	`KEY_FAILDEROT` The key to the failure probability of the focus telescope command.
`static String`	`KEY_FAILFOCUS` The key to the failure probability of the focus telescope command.
`static String`	`KEY_FAILINIT` The key to the failure probability of the init telescope command.
`static String`	`KEY_FAILMIRROR` The key to the failure probability of the focus telescope command.
`static String`	`KEY_FAILMOVE` The key to the failure probability of the move telescope command.
`static String`	`KEY_FAILOFFSET` The key to the failure probability of the focus telescope command.
`static String`	`KEY_FAILPARK` The key to the failure probability of the park telescope command.
`static String`	`KEY_FOCUSVALUE` The key to the value naming the focus position of the telescope.
`static String`	`KEY_GUIDETRIGGER` The key to the trigger naming the is-guiding state of the telescope.
`static String`	`KEY_INITTRIGGER` The key to the trigger naming the is-init state of the telescope.
`static String`	`KEY_RAVALUE` The key to the value naming the ra of the telescope.
`static String`	`KEY_SET` The key to the properties of the parameter set.
`static String`	`KEY_STARTUPALT` The key to the default telescope zenith distance if val is undefined.
`static String`	`KEY_STARTUPAZ` The key to the default telescope azimuth if value is undefined.
`static String`	`KEY_TRACKTIMEBASE` The key to the base-time of the track-time remaining status event.
`static String`	`KEY_TRACKTIMEDIVERT` The key to the divergence of the track-time remaining status event.
`private ErrorEvent`	`lasterror` The error occured at the last command processing simulation.

Fields inherited from class stella.rmi.GenericSimulator
ACKNOWLEDGEPREFIX, DEFUNIQUE, DEVIATEPREFIX, DONEPREFIX, KEY_ACCELERATE, KEY_ERRORCLASSES, KEY_ERRORINTERVAL, KEY_ERRORPROBABILITIES, KEY_GENERICACKNOWLEDGE, KEY_GENERICDEVIATE, KEY_GENERICDONE, KEY_UNIQUE, random

Fields inherited from class stella.rmi.ReceiverTorso
KEY_BIND, KEY_BINDNAME, KEY_COMMANDCASTER, KEY_ERRORCOOL

Fields inherited from class util.rmi.AbstractRmiListener
KEY_ALIVE, KEY_EXPORTPORT, KEY_INIT, KEY_LISTENERNAME, KEY_RETRY, KEY_RETRYSLEEP, KEY_SHUTDOWNDELAY

Fields inherited from class util.PropertyResources
KEY_NOINITONCREATE, POSTFIX_ALPHABET, POSTFIX_BYTES, POSTFIX_DIR, POSTFIX_EXT, POSTFIX_FILE, POSTFIX_LIST, POSTFIX_MODTIME, POSTFIX_URL

Fields inherited from class util.PropertyContainer
KEY_LISTSEPARATOR, KEY_MAPKEYVALUECHAR, KEY_MAPSEPARATOR

Fields inherited from interface stella.rmi.RmiAcknowledgeCaster
NAMING_EXTENSION

Fields inherited from interface stella.rmi.RmiDoneCaster
NAMING_EXTENSION

Fields inherited from interface util.StepInitializable
KEY_INITDEPTH

Fields inherited from interface util.ResourceSupplying
KEY_URLRESOURCES, KEY_URLUSECONFIG, KEY_URLUSECURRENT, KEY_URLUSEHOME

Fields inherited from interface util.PropertySupplying
CONFIG, KEY_CLASS

Constructor Summary

Constructors
Constructor and Description

TelescopeSimulator(Map<String,String> prop)
Constructs a new telescope simulator.

Constructors
Constructor and Description
`TelescopeSimulator(Map<String,String> prop)` Constructs a new telescope simulator.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`accepts(CommandEvent ce)` Returns true if this receiver accepts commands of the type handed over as an argument.
`protected ErrorEvent`	`getLastError()` Returns the last error that occured during command processing.
`protected boolean`	`isAllowed(ErrorEvent ee)` Returns true if the error handed over is either a `NoTelescope` instance or, if guiding is on, a `RepositionTelescope`.
`static void`	`main(String[] arg)` Constructs a new telescope simulator.
`private static Map<String,String>`	`myAugment(Map<String,String> def)` Augments the properties three times, for acknowledge and done times and for d factors.
`protected boolean`	`processCommand(CommandEvent ce, int acknr)` Simulated command execution.

Methods inherited from class stella.rmi.AbstractRmiCasterAndListener
addErrorListener, addRmiErrorListener, bindToRegistry, getBindName, isValid, notifyErrorListener, removeErrorListener, removeRmiErrorListener, sendError, sendError, sendError, sendStatus, sendStatus, sendStatus, unbindFromRegistry

Methods inherited from class util.rmi.AbstractRmiListener
allBound, blockBinding, blockBinding, disconnect, getIP, getListenerName, isConnected, listenerName, releaseBinding, releaseBinding, startBinding, startBinding

Methods inherited from class util.PropertyResources
clone, createFrom, createFrom, createFrom, createInstance, getApplet, getAsResources, getLocate, getPropertiesToKey, getPropertiesToKey, getResource, getResourceAsStream, getResourceFromKey, getResources, hasLocalURLs, initProperties, keyCreate, keyCreate, reload, setApplet

Methods inherited from class util.PropertyContainer
augment, augment, augment, augment, augment, defaultBoolean, defaultChar, defaultDouble, defaultFloat, defaultInt, defaultLong, defaultObject, defaultObject, defaultProperties, defaultProperty, getAsBoolean, getAsChar, getAsDouble, getAsEnums, getAsFloat, getAsInt, getAsList, getAsLong, getAsMap, getAsMap, getAsObject, getAsObject, getProperties, getProperty, has, isNew, parseObject, parseObject, reload, removeProperty, requires, setObject, setProperties, setProperty, stringProperties

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface util.rmi.RmiCaster
bindToRegistry, isValid, unbindFromRegistry

Methods inherited from interface stella.ErrorCaster
addErrorListener, removeErrorListener

Methods inherited from interface util.rmi.RmiEventListener
getListenerName

Methods inherited from interface util.rmi.RmiListener
disconnect, isConnected

Methods inherited from interface util.PropertySupplying
defaultBoolean, defaultChar, defaultDouble, defaultFloat, defaultInt, defaultLong, defaultObject, defaultObject, defaultProperties, defaultProperty, getAsBoolean, getAsChar, getAsDouble, getAsFloat, getAsInt, getAsList, getAsLong, getAsMap, getAsObject, getAsObject, getProperties, getProperty, has, parseObject, removeProperty, setObject, setProperty, stringProperties

- Field Detail
  - KEY_FAILOFFSET
```
public static final String KEY_FAILOFFSET
```
    The key to the failure probability of the focus telescope command.
    
    See Also:
    
    Constant Field Values
  - KEY_FAILDEROT
```
public static final String KEY_FAILDEROT
```
    The key to the failure probability of the focus telescope command.
    
    See Also:
    
    Constant Field Values
  - KEY_FAILMIRROR
```
public static final String KEY_FAILMIRROR
```
    The key to the failure probability of the focus telescope command.
    
    See Also:
    
    Constant Field Values
  - KEY_FAILFOCUS
```
public static final String KEY_FAILFOCUS
```
    The key to the failure probability of the focus telescope command.
    
    See Also:
    
    Constant Field Values
  - KEY_FAILINIT
```
public static final String KEY_FAILINIT
```
    The key to the failure probability of the init telescope command.
    
    See Also:
    
    Constant Field Values
  - KEY_FAILMOVE
```
public static final String KEY_FAILMOVE
```
    The key to the failure probability of the move telescope command.
    
    See Also:
    
    Constant Field Values
  - KEY_FAILPARK
```
public static final String KEY_FAILPARK
```
    The key to the failure probability of the park telescope command.
    
    See Also:
    
    Constant Field Values
  - KEY_TRACKTIMEBASE
```
public static final String KEY_TRACKTIMEBASE
```
    The key to the base-time of the track-time remaining status event.
    
    See Also:
    
    Constant Field Values
  - KEY_TRACKTIMEDIVERT
```
public static final String KEY_TRACKTIMEDIVERT
```
    The key to the divergence of the track-time remaining status event.
    
    See Also:
    
    Constant Field Values
  - KEY_ERRORSYMBOLS
```
public static final String KEY_ERRORSYMBOLS
```
    The key to the error sysmbols to set in the status message.
    
    See Also:
    
    Constant Field Values
  - KEY_SET
```
public static final String KEY_SET
```
    The key to the properties of the parameter set.
    
    See Also:
    
    Constant Field Values
  - KEY_INITTRIGGER
```
public static final String KEY_INITTRIGGER
```
    The key to the trigger naming the is-init state of the telescope.
    
    See Also:
    
    Constant Field Values
  - KEY_GUIDETRIGGER
```
public static final String KEY_GUIDETRIGGER
```
    The key to the trigger naming the is-guiding state of the telescope.
    
    See Also:
    
    Constant Field Values
  - KEY_FOCUSVALUE
```
public static final String KEY_FOCUSVALUE
```
    The key to the value naming the focus position of the telescope.
    
    See Also:
    
    Constant Field Values
  - KEY_RAVALUE
```
public static final String KEY_RAVALUE
```
    The key to the value naming the ra of the telescope.
    
    See Also:
    
    Constant Field Values
  - KEY_DECVALUE
```
public static final String KEY_DECVALUE
```
    The key to the value naming the dec of the telescope.
    
    See Also:
    
    Constant Field Values
  - KEY_AZVALUE
```
public static final String KEY_AZVALUE
```
    The key to the value naming azimuth of the telescope.
    
    See Also:
    
    Constant Field Values
  - KEY_ALTVALUE
```
public static final String KEY_ALTVALUE
```
    The key to the value naming altitude of the telescope.
    
    See Also:
    
    Constant Field Values
  - KEY_STARTUPAZ
```
public static final String KEY_STARTUPAZ
```
    The key to the default telescope azimuth if value is undefined.
    
    See Also:
    
    Constant Field Values
  - KEY_STARTUPALT
```
public static final String KEY_STARTUPALT
```
    The key to the default telescope zenith distance if val is undefined.
    
    See Also:
    
    Constant Field Values
  - DEFFAILOFFSET
```
private static final double DEFFAILOFFSET
```
    The default of the failure probability of the focus telescope command.
    
    See Also:
    
    Constant Field Values
  - DEFFAILDEROT
```
private static final double DEFFAILDEROT
```
    The default of the failure probability of the focus telescope command.
    
    See Also:
    
    Constant Field Values
  - DEFFAILMIRROR
```
private static final double DEFFAILMIRROR
```
    The default of the failure probability of the focus telescope command.
    
    See Also:
    
    Constant Field Values
  - DEFFAILFOCUS
```
private static final double DEFFAILFOCUS
```
    The default of the failure probability of the focus telescope command.
    
    See Also:
    
    Constant Field Values
  - DEFFAILINIT
```
private static final double DEFFAILINIT
```
    The default of the failure probability of the init telescope command.
    
    See Also:
    
    Constant Field Values
  - DEFFAILMOVE
```
private static final double DEFFAILMOVE
```
    The default of the failure probability of the move telescope command.
    
    See Also:
    
    Constant Field Values
  - DEFFAILPARK
```
private static final double DEFFAILPARK
```
    The default to the failure probability of the park telescope command.
    
    See Also:
    
    Constant Field Values
  - DEFTRACKTIMEBASE
```
private static final long DEFTRACKTIMEBASE
```
    The default to the base-time of the track-time remaining status event.
    
    See Also:
    
    Constant Field Values
  - DEFTRACKTIMEDIVERT
```
private static final double DEFTRACKTIMEDIVERT
```
    The default to the divergence of the track-time remaining status.
    
    See Also:
    
    Constant Field Values
  - DEFERRORSYMBOLS
```
private static final String DEFERRORSYMBOLS
```
    The default error symbols to set in the status message.
    
    See Also:
    
    Constant Field Values
  - DEFSET
```
private static final String DEFSET
```
    The default properties of the hidden parameter set of the simulator.
    
    See Also:
    
    Constant Field Values
  - DEFINITTRIGGER
```
private static final String DEFINITTRIGGER
```
    The default name of the init-telescope trigger..
    
    See Also:
    
    Constant Field Values
  - DEFGUIDETRIGGER
```
private static final String DEFGUIDETRIGGER
```
    The default name of the guiding-telescope trigger.
    
    See Also:
    
    Constant Field Values
  - DEFFOCUSVALUE
```
private static final String DEFFOCUSVALUE
```
    The default name of the focus position value.
    
    See Also:
    
    Constant Field Values
  - DEFRAVALUE
```
private static final String DEFRAVALUE
```
    The default name of the telescope ra value.
    
    See Also:
    
    Constant Field Values
  - DEFDECVALUE
```
private static final String DEFDECVALUE
```
    The default name of the telescope dec value.
    
    See Also:
    
    Constant Field Values
  - DEFAZVALUE
```
private static final String DEFAZVALUE
```
    The default name of the telescope azimuth value.
    
    See Also:
    
    Constant Field Values
  - DEFALTVALUE
```
private static final String DEFALTVALUE
```
    The default name of the telescope altitude value.
    
    See Also:
    
    Constant Field Values
  - DEFSTARTUPAZ
```
private static final double DEFSTARTUPAZ
```
    The startup-value of the telescope azimuth.
    
    See Also:
    
    Constant Field Values
  - DEFSTARTUPALT
```
private static final double DEFSTARTUPALT
```
    The startup-value of the telescope zenith distance.
    
    See Also:
    
    Constant Field Values
  - DEFERRORCLASSES
```
private static final String DEFERRORCLASSES
```
    The default error list.
    
    See Also:
    
    Constant Field Values
  - DEFERRORPROBABILITIES
```
private static final String DEFERRORPROBABILITIES
```
    The default error probabilities.
    
    See Also:
    
    Constant Field Values
  - COMMANDS
```
private static final String[] COMMANDS
```
    The known command types, used for acknowledges and true dones.
  - ACKTIMES
```
private static final String[] ACKTIMES
```
    The acknowledge times for the known commands.
  - DONETIMES
```
private static final String[] DONETIMES
```
    The actual execution times for the commands.
  - DIVERT
```
private static final String[] DIVERT
```
    The actual divert factors for the commands.
  - lasterror
```
private ErrorEvent lasterror
```
    The error occured at the last command processing simulation.
  - curerror
```
private String curerror
```
    The currently active error symbols.
- Constructor Detail
  - TelescopeSimulator
```
public TelescopeSimulator(Map<String,String> prop)
                   throws RemoteException
```
    Constructs a new telescope simulator. Different to the true telescope server, this implementation is based on RMI and therefore not inetended to test basic communication properties.
    
    Throws:
    
    RemoteException
- Method Detail
  - myAugment
```
private static Map<String,String> myAugment(Map<String,String> def)
```
    Augments the properties three times, for acknowledge and done times and for d factors. Uses an own method to increase readability.
  - accepts
```
public boolean accepts(CommandEvent ce)
                throws RemoteException
```
    Returns true if this receiver accepts commands of the type handed over as an argument. An telescope simulator accepts all sort of TelescopeCommands.
    
    Throws:
    
    RemoteException
  - isAllowed
```
protected boolean isAllowed(ErrorEvent ee)
```
    Returns true if the error handed over is either a NoTelescope instance or, if guiding is on, a RepositionTelescope.
    
    Specified by:
    
    isAllowed in class GenericSimulator
  - getLastError
```
protected ErrorEvent getLastError()
```
    Returns the last error that occured during command processing.
  - processCommand
```
protected boolean processCommand(CommandEvent ce,
                                 int acknr)
```
    Simulated command execution. The following commands are allowed (plus special actions taken)
    - AbortTelescope: Does not throw any special errors. Aborts all commands currently processed with a premature done event.
    - FocusTelescope: Fails for a CannotFocusMirror error with a probaility of KEY_FAILFOCUS. Sets the internal variable focus position to the required value.
    - InitTelescope: Fails with a CannotInitTelescope or a CannotOpenMirrorCover, both with a probability of KEY_FAILINIT.
    - MoveTelescope: Fails with a CannotMoveTelescope error with a KEY_FAILMOVE probability. Sends back a TracktimeRemaining status event with a random tracking time.
    - ParkTelescope: Fails with a CannotMoveTelescope error with a KEY_FAILMOVE probability or a CannotCloseMirrorCover with a KEY_FAILPARK
    - StartGuideTelescope: Toggles the guiding trigger, does not fail.
    - StopGuideTelescope: Toggles the guiding trigger, does not fail.
    - StatusTelescope: Does not fail, produces a TelescopeStatus event prior to sending the final done. Uses the correct settings of guiding, power, init, and focus position. The azimuth and the zenith distance are calculated from the last telescope position. Note that the parameter set houses only an altitude parameter. Derotator position is always zero.
    Overrides:
    
    processCommand in class GenericSimulator
  - main
```
public static void main(String[] arg)
                 throws RemoteException
```
    Constructs a new telescope simulator. The single argument supplied are the simulator properties.
    
    Throws:
    
    RemoteException

Class TelescopeSimulator

Nested Class Summary

Nested classes/interfaces inherited from class stella.rmi.ReceiverTorso

Nested classes/interfaces inherited from class util.PropertyResources

Field Summary

Fields inherited from class stella.rmi.GenericSimulator

Fields inherited from class stella.rmi.ReceiverTorso

Fields inherited from class util.rmi.AbstractRmiListener

Fields inherited from class util.PropertyResources

Fields inherited from class util.PropertyContainer

Fields inherited from interface stella.rmi.RmiAcknowledgeCaster

Fields inherited from interface stella.rmi.RmiDoneCaster

Fields inherited from interface util.StepInitializable

Fields inherited from interface util.ResourceSupplying

Fields inherited from interface util.PropertySupplying

Constructor Summary

Method Summary

Methods inherited from class stella.rmi.GenericSimulator

Methods inherited from class stella.rmi.ReceiverTorso

Methods inherited from class stella.rmi.AbstractRmiCasterAndListener

Methods inherited from class util.rmi.AbstractRmiListener

Methods inherited from class util.PropertyResources

Methods inherited from class util.PropertyContainer

Methods inherited from class java.lang.Object

Methods inherited from interface util.rmi.RmiCaster

Methods inherited from interface stella.ErrorCaster

Methods inherited from interface util.rmi.RmiEventListener

Methods inherited from interface util.rmi.RmiListener

Methods inherited from interface util.PropertySupplying

Field Detail

KEY_FAILOFFSET

KEY_FAILDEROT

KEY_FAILMIRROR

KEY_FAILFOCUS

KEY_FAILINIT

KEY_FAILMOVE

KEY_FAILPARK

KEY_TRACKTIMEBASE

KEY_TRACKTIMEDIVERT

KEY_ERRORSYMBOLS

KEY_SET

KEY_INITTRIGGER

KEY_GUIDETRIGGER

KEY_FOCUSVALUE

KEY_RAVALUE

KEY_DECVALUE

KEY_AZVALUE

KEY_ALTVALUE

KEY_STARTUPAZ

KEY_STARTUPALT

DEFFAILOFFSET

DEFFAILDEROT

DEFFAILMIRROR

DEFFAILFOCUS

DEFFAILINIT

DEFFAILMOVE

DEFFAILPARK

DEFTRACKTIMEBASE

DEFTRACKTIMEDIVERT

DEFERRORSYMBOLS

DEFSET

DEFINITTRIGGER

DEFGUIDETRIGGER

DEFFOCUSVALUE

DEFRAVALUE

DEFDECVALUE

DEFAZVALUE

DEFALTVALUE

DEFSTARTUPAZ

DEFSTARTUPALT

DEFERRORCLASSES

DEFERRORPROBABILITIES

COMMANDS

ACKTIMES

DONETIMES

DIVERT

lasterror

curerror

Constructor Detail

TelescopeSimulator