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   1 /**
   2  * Copyright (c) 2010-2021 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.hue.internal.handler;
  14
  15 import static org.openhab.binding.hue.internal.HueBindingConstants.*;
  16 import static org.openhab.core.thing.Thing.*;
  17
  18 import java.math.BigDecimal;
  19 import java.util.Collection;
  20 import java.util.List;
  21 import java.util.Map;
  22 import java.util.Objects;
  23 import java.util.Set;
  24 import java.util.concurrent.ScheduledFuture;
  25 import java.util.concurrent.TimeUnit;
  26
  27 import org.eclipse.jdt.annotation.NonNullByDefault;
  28 import org.eclipse.jdt.annotation.Nullable;
  29 import org.openhab.binding.hue.internal.FullLight;
  30 import org.openhab.binding.hue.internal.State;
  31 import org.openhab.binding.hue.internal.StateUpdate;
  32 import org.openhab.binding.hue.internal.action.LightActions;
  33 import org.openhab.binding.hue.internal.dto.Capabilities;
  34 import org.openhab.binding.hue.internal.dto.ColorTemperature;
  35 import org.openhab.core.library.types.DecimalType;
  36 import org.openhab.core.library.types.HSBType;
  37 import org.openhab.core.library.types.IncreaseDecreaseType;
  38 import org.openhab.core.library.types.OnOffType;
  39 import org.openhab.core.library.types.PercentType;
  40 import org.openhab.core.library.types.StringType;
  41 import org.openhab.core.thing.Bridge;
  42 import org.openhab.core.thing.ChannelUID;
  43 import org.openhab.core.thing.Thing;
  44 import org.openhab.core.thing.ThingStatus;
  45 import org.openhab.core.thing.ThingStatusDetail;
  46 import org.openhab.core.thing.ThingStatusInfo;
  47 import org.openhab.core.thing.ThingTypeUID;
  48 import org.openhab.core.thing.binding.BaseThingHandler;
  49 import org.openhab.core.thing.binding.ThingHandler;
  50 import org.openhab.core.thing.binding.ThingHandlerService;
  51 import org.openhab.core.types.Command;
  52 import org.openhab.core.types.StateDescriptionFragment;
  53 import org.openhab.core.types.StateDescriptionFragmentBuilder;
  54 import org.slf4j.Logger;
  55 import org.slf4j.LoggerFactory;
  56
  57 /**
  58  * {@link HueLightHandler} is the handler for a hue light. It uses the {@link HueClient} to execute the actual
  59  * command.
  60  *
  61  * @author Dennis Nobel - Initial contribution
  62  * @author Oliver Libutzki - Adjustments
  63  * @author Kai Kreuzer - stabilized code
  64  * @author Andre Fuechsel - implemented switch off when brightness == 0, changed to support generic thing types, changed
  65  *         the initialization of properties
  66  * @author Thomas Höfer - added thing properties
  67  * @author Jochen Hiller - fixed status updates for reachable=true/false
  68  * @author Markus Mazurczak - added code for command handling of OSRAM PAR16 50
  69  *         bulbs
  70  * @author Yordan Zhelev - added alert and effect functions
  71  * @author Denis Dudnik - switched to internally integrated source of Jue library
  72  * @author Christoph Weitkamp - Added support for bulbs using CIE XY colormode only
  73  * @author Jochen Leopold - Added support for custom fade times
  74  */
  75 @NonNullByDefault
  76 public class HueLightHandler extends BaseThingHandler implements LightStatusListener {
  77
  78     public static final Set<ThingTypeUID> SUPPORTED_THING_TYPES = Set.of(THING_TYPE_COLOR_LIGHT,
  79             THING_TYPE_COLOR_TEMPERATURE_LIGHT, THING_TYPE_DIMMABLE_LIGHT, THING_TYPE_EXTENDED_COLOR_LIGHT,
  80             THING_TYPE_ON_OFF_LIGHT, THING_TYPE_ON_OFF_PLUG, THING_TYPE_DIMMABLE_PLUG);
  81
  82     public static final String OSRAM_PAR16_50_TW_MODEL_ID = "PAR16_50_TW";
  83
  84     private final Logger logger = LoggerFactory.getLogger(HueLightHandler.class);
  85
  86     private final HueStateDescriptionProvider stateDescriptionProvider;
  87
  88     private @NonNullByDefault({}) String lightId;
  89
  90     private @Nullable FullLight lastFullLight;
  91     private long endBypassTime = 0L;
  92
  93     private @Nullable Integer lastSentColorTemp;
  94     private @Nullable Integer lastSentBrightness;
  95
  96     // Flag to indicate whether the bulb is of type Osram par16 50 TW or not
  97     private boolean isOsramPar16 = false;
  98
  99     private boolean propertiesInitializedSuccessfully = false;
 100     private boolean capabilitiesInitializedSuccessfully = false;
 101     private ColorTemperature colorTemperatureCapabilties = new ColorTemperature();
 102     private long defaultFadeTime = 400;
 103
 104     private @Nullable HueClient hueClient;
 105
 106     private @Nullable ScheduledFuture<?> scheduledFuture;
 107
 108     public HueLightHandler(Thing hueLight, HueStateDescriptionProvider stateDescriptionProvider) {
 109         super(hueLight);
 110         this.stateDescriptionProvider = stateDescriptionProvider;
 111     }
 112
 113     @Override
 114     public void initialize() {
 115         logger.debug("Initializing hue light handler.");
 116         Bridge bridge = getBridge();
 117         initializeThing((bridge == null) ? null : bridge.getStatus());
 118     }
 119
 120     @Override
 121     public void bridgeStatusChanged(ThingStatusInfo bridgeStatusInfo) {
 122         logger.debug("bridgeStatusChanged {}", bridgeStatusInfo);
 123         initializeThing(bridgeStatusInfo.getStatus());
 124     }
 125
 126     private void initializeThing(@Nullable ThingStatus bridgeStatus) {
 127         logger.debug("initializeThing thing {} bridge status {}", getThing().getUID(), bridgeStatus);
 128         final String configLightId = (String) getConfig().get(LIGHT_ID);
 129         if (configLightId != null) {
 130             BigDecimal time = (BigDecimal) getConfig().get(FADETIME);
 131             if (time != null) {
 132                 defaultFadeTime = time.longValueExact();
 133             }
 134
 135             lightId = configLightId;
 136             // note: this call implicitly registers our handler as a listener on the bridge
 137             HueClient bridgeHandler = getHueClient();
 138             if (bridgeHandler != null) {
 139                 if (bridgeStatus == ThingStatus.ONLINE) {
 140                     FullLight fullLight = bridgeHandler.getLightById(lightId);
 141                     initializeProperties(fullLight);
 142                     initializeCapabilities(fullLight);
 143                     updateStatus(ThingStatus.ONLINE);
 144                 } else {
 145                     updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.BRIDGE_OFFLINE);
 146                 }
 147             } else {
 148                 updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.BRIDGE_UNINITIALIZED);
 149             }
 150         } else {
 151             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
 152                     "@text/offline.conf-error-no-light-id");
 153         }
 154     }
 155
 156     private synchronized void initializeProperties(@Nullable FullLight fullLight) {
 157         if (!propertiesInitializedSuccessfully && fullLight != null) {
 158             Map<String, String> properties = editProperties();
 159             String softwareVersion = fullLight.getSoftwareVersion();
 160             if (softwareVersion != null) {
 161                 properties.put(PROPERTY_FIRMWARE_VERSION, softwareVersion);
 162             }
 163             String modelId = fullLight.getNormalizedModelID();
 164             if (modelId != null) {
 165                 properties.put(PROPERTY_MODEL_ID, modelId);
 166             }
 167             properties.put(PROPERTY_VENDOR, fullLight.getManufacturerName());
 168             properties.put(PRODUCT_NAME, fullLight.getProductName());
 169             String uniqueID = fullLight.getUniqueID();
 170             if (uniqueID != null) {
 171                 properties.put(UNIQUE_ID, uniqueID);
 172             }
 173             updateProperties(properties);
 174             isOsramPar16 = OSRAM_PAR16_50_TW_MODEL_ID.equals(modelId);
 175             propertiesInitializedSuccessfully = true;
 176         }
 177     }
 178
 179     private void initializeCapabilities(@Nullable FullLight fullLight) {
 180         if (!capabilitiesInitializedSuccessfully && fullLight != null) {
 181             Capabilities capabilities = fullLight.capabilities;
 182             if (capabilities != null) {
 183                 ColorTemperature ct = capabilities.control.ct;
 184                 if (ct != null) {
 185                     colorTemperatureCapabilties = ct;
 186
 187                     // minimum and maximum are inverted due to mired/Kelvin conversion!
 188                     StateDescriptionFragment stateDescriptionFragment = StateDescriptionFragmentBuilder.create()
 189                             .withMinimum(new BigDecimal(LightStateConverter.miredToKelvin(ct.max))) //
 190                             .withMaximum(new BigDecimal(LightStateConverter.miredToKelvin(ct.min))) //
 191                             .withStep(new BigDecimal(100)) //
 192                             .withPattern("%.0f K") //
 193                             .build();
 194                     stateDescriptionProvider.setStateDescriptionFragment(
 195                             new ChannelUID(thing.getUID(), CHANNEL_COLORTEMPERATURE_ABS), stateDescriptionFragment);
 196                 }
 197             }
 198             capabilitiesInitializedSuccessfully = true;
 199         }
 200     }
 201
 202     @Override
 203     public void dispose() {
 204         logger.debug("Hue light handler disposes. Unregistering listener.");
 205         cancelScheduledFuture();
 206         if (lightId != null) {
 207             HueClient bridgeHandler = getHueClient();
 208             if (bridgeHandler != null) {
 209                 bridgeHandler.unregisterLightStatusListener(this);
 210                 hueClient = null;
 211             }
 212             lightId = null;
 213         }
 214     }
 215
 216     @Override
 217     public void handleCommand(ChannelUID channelUID, Command command) {
 218         handleCommand(channelUID.getId(), command, defaultFadeTime);
 219     }
 220
 221     public void handleCommand(String channel, Command command, long fadeTime) {
 222         HueClient bridgeHandler = getHueClient();
 223         if (bridgeHandler == null) {
 224             logger.warn("hue bridge handler not found. Cannot handle command without bridge.");
 225             return;
 226         }
 227
 228         final FullLight light = lastFullLight == null ? bridgeHandler.getLightById(lightId) : lastFullLight;
 229         if (light == null) {
 230             logger.debug("hue light not known on bridge. Cannot handle command.");
 231             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.CONFIGURATION_ERROR,
 232                     "@text/offline.conf-error-wrong-light-id");
 233             return;
 234         }
 235
 236         Integer lastColorTemp;
 237         StateUpdate lightState = null;
 238         switch (channel) {
 239             case CHANNEL_COLORTEMPERATURE:
 240                 if (command instanceof PercentType) {
 241                     lightState = LightStateConverter.toColorTemperatureLightStateFromPercentType((PercentType) command,
 242                             colorTemperatureCapabilties);
 243                     lightState.setTransitionTime(fadeTime);
 244                 } else if (command instanceof OnOffType) {
 245                     lightState = LightStateConverter.toOnOffLightState((OnOffType) command);
 246                     if (isOsramPar16) {
 247                         lightState = addOsramSpecificCommands(lightState, (OnOffType) command);
 248                     }
 249                 } else if (command instanceof IncreaseDecreaseType) {
 250                     lightState = convertColorTempChangeToStateUpdate((IncreaseDecreaseType) command, light);
 251                     if (lightState != null) {
 252                         lightState.setTransitionTime(fadeTime);
 253                     }
 254                 }
 255                 break;
 256             case CHANNEL_COLORTEMPERATURE_ABS:
 257                 if (command instanceof DecimalType) {
 258                     lightState = LightStateConverter.toColorTemperatureLightState((DecimalType) command,
 259                             colorTemperatureCapabilties);
 260                     lightState.setTransitionTime(fadeTime);
 261                 }
 262                 break;
 263             case CHANNEL_BRIGHTNESS:
 264                 if (command instanceof PercentType) {
 265                     lightState = LightStateConverter.toBrightnessLightState((PercentType) command);
 266                     lightState.setTransitionTime(fadeTime);
 267                 } else if (command instanceof OnOffType) {
 268                     lightState = LightStateConverter.toOnOffLightState((OnOffType) command);
 269                     if (isOsramPar16) {
 270                         lightState = addOsramSpecificCommands(lightState, (OnOffType) command);
 271                     }
 272                 } else if (command instanceof IncreaseDecreaseType) {
 273                     lightState = convertBrightnessChangeToStateUpdate((IncreaseDecreaseType) command, light);
 274                     if (lightState != null) {
 275                         lightState.setTransitionTime(fadeTime);
 276                     }
 277                 }
 278                 lastColorTemp = lastSentColorTemp;
 279                 if (lightState != null && lastColorTemp != null) {
 280                     // make sure that the light also has the latest color temp
 281                     // this might not have been yet set in the light, if it was off
 282                     lightState.setColorTemperature(lastColorTemp, colorTemperatureCapabilties);
 283                     lightState.setTransitionTime(fadeTime);
 284                 }
 285                 break;
 286             case CHANNEL_SWITCH:
 287                 if (command instanceof OnOffType) {
 288                     lightState = LightStateConverter.toOnOffLightState((OnOffType) command);
 289                     if (isOsramPar16) {
 290                         lightState = addOsramSpecificCommands(lightState, (OnOffType) command);
 291                     }
 292                 }
 293                 lastColorTemp = lastSentColorTemp;
 294                 if (lightState != null && lastColorTemp != null) {
 295                     // make sure that the light also has the latest color temp
 296                     // this might not have been yet set in the light, if it was off
 297                     lightState.setColorTemperature(lastColorTemp, colorTemperatureCapabilties);
 298                     lightState.setTransitionTime(fadeTime);
 299                 }
 300                 break;
 301             case CHANNEL_COLOR:
 302                 if (command instanceof HSBType) {
 303                     HSBType hsbCommand = (HSBType) command;
 304                     if (hsbCommand.getBrightness().intValue() == 0) {
 305                         lightState = LightStateConverter.toOnOffLightState(OnOffType.OFF);
 306                     } else {
 307                         lightState = LightStateConverter.toColorLightState(hsbCommand, light.getState());
 308                         lightState.setTransitionTime(fadeTime);
 309                     }
 310                 } else if (command instanceof PercentType) {
 311                     lightState = LightStateConverter.toBrightnessLightState((PercentType) command);
 312                     lightState.setTransitionTime(fadeTime);
 313                 } else if (command instanceof OnOffType) {
 314                     lightState = LightStateConverter.toOnOffLightState((OnOffType) command);
 315                 } else if (command instanceof IncreaseDecreaseType) {
 316                     lightState = convertBrightnessChangeToStateUpdate((IncreaseDecreaseType) command, light);
 317                     if (lightState != null) {
 318                         lightState.setTransitionTime(fadeTime);
 319                     }
 320                 }
 321                 break;
 322             case CHANNEL_ALERT:
 323                 if (command instanceof StringType) {
 324                     lightState = LightStateConverter.toAlertState((StringType) command);
 325                     if (lightState == null) {
 326                         // Unsupported StringType is passed. Log a warning
 327                         // message and return.
 328                         logger.warn("Unsupported String command: {}. Supported commands are: {}, {}, {} ", command,
 329                                 LightStateConverter.ALERT_MODE_NONE, LightStateConverter.ALERT_MODE_SELECT,
 330                                 LightStateConverter.ALERT_MODE_LONG_SELECT);
 331                         return;
 332                     } else {
 333                         scheduleAlertStateRestore(command);
 334                     }
 335                 }
 336                 break;
 337             case CHANNEL_EFFECT:
 338                 if (command instanceof OnOffType) {
 339                     lightState = LightStateConverter.toOnOffEffectState((OnOffType) command);
 340                 }
 341                 break;
 342         }
 343         if (lightState != null) {
 344             // Cache values which we have sent
 345             Integer tmpBrightness = lightState.getBrightness();
 346             if (tmpBrightness != null) {
 347                 lastSentBrightness = tmpBrightness;
 348             }
 349             Integer tmpColorTemp = lightState.getColorTemperature();
 350             if (tmpColorTemp != null) {
 351                 lastSentColorTemp = tmpColorTemp;
 352             }
 353             bridgeHandler.updateLightState(this, light, lightState, fadeTime);
 354         } else {
 355             logger.warn("Command sent to an unknown channel id: {}:{}", getThing().getUID(), channel);
 356         }
 357     }
 358
 359     /*
 360      * Applies additional {@link StateUpdate} commands as a workaround for Osram
 361      * Lightify PAR16 TW firmware bug. Also see
 362      * http://www.everyhue.com/vanilla/discussion/1756/solved-lightify-turning-off
 363      */
 364     private StateUpdate addOsramSpecificCommands(StateUpdate lightState, OnOffType actionType) {
 365         if (actionType.equals(OnOffType.ON)) {
 366             lightState.setBrightness(254);
 367         } else {
 368             lightState.setTransitionTime(0);
 369         }
 370         return lightState;
 371     }
 372
 373     private @Nullable StateUpdate convertColorTempChangeToStateUpdate(IncreaseDecreaseType command, FullLight light) {
 374         StateUpdate stateUpdate = null;
 375         Integer currentColorTemp = getCurrentColorTemp(light.getState());
 376         if (currentColorTemp != null) {
 377             int newColorTemp = LightStateConverter.toAdjustedColorTemp(command, currentColorTemp,
 378                     colorTemperatureCapabilties);
 379             stateUpdate = new StateUpdate().setColorTemperature(newColorTemp, colorTemperatureCapabilties);
 380         }
 381         return stateUpdate;
 382     }
 383
 384     private @Nullable Integer getCurrentColorTemp(@Nullable State lightState) {
 385         Integer colorTemp = lastSentColorTemp;
 386         if (colorTemp == null && lightState != null) {
 387             return lightState.getColorTemperature();
 388         }
 389         return colorTemp;
 390     }
 391
 392     private @Nullable StateUpdate convertBrightnessChangeToStateUpdate(IncreaseDecreaseType command, FullLight light) {
 393         Integer currentBrightness = getCurrentBrightness(light.getState());
 394         if (currentBrightness == null) {
 395             return null;
 396         }
 397         int newBrightness = LightStateConverter.toAdjustedBrightness(command, currentBrightness);
 398         return createBrightnessStateUpdate(currentBrightness, newBrightness);
 399     }
 400
 401     private @Nullable Integer getCurrentBrightness(@Nullable State lightState) {
 402         if (lastSentBrightness == null && lightState != null) {
 403             return lightState.isOn() ? lightState.getBrightness() : 0;
 404         }
 405         return lastSentBrightness;
 406     }
 407
 408     private StateUpdate createBrightnessStateUpdate(int currentBrightness, int newBrightness) {
 409         StateUpdate lightUpdate = new StateUpdate();
 410         if (newBrightness == 0) {
 411             lightUpdate.turnOff();
 412         } else {
 413             lightUpdate.setBrightness(newBrightness);
 414             if (currentBrightness == 0) {
 415                 lightUpdate.turnOn();
 416             }
 417         }
 418         return lightUpdate;
 419     }
 420
 421     protected synchronized @Nullable HueClient getHueClient() {
 422         if (hueClient == null) {
 423             Bridge bridge = getBridge();
 424             if (bridge == null) {
 425                 return null;
 426             }
 427             ThingHandler handler = bridge.getHandler();
 428             if (handler instanceof HueClient) {
 429                 HueClient bridgeHandler = (HueClient) handler;
 430                 hueClient = bridgeHandler;
 431                 bridgeHandler.registerLightStatusListener(this);
 432             } else {
 433                 return null;
 434             }
 435         }
 436         return hueClient;
 437     }
 438
 439     @Override
 440     public void setPollBypass(long bypassTime) {
 441         endBypassTime = System.currentTimeMillis() + bypassTime;
 442     }
 443
 444     @Override
 445     public void unsetPollBypass() {
 446         endBypassTime = 0L;
 447     }
 448
 449     @Override
 450     public boolean onLightStateChanged(FullLight fullLight) {
 451         logger.trace("onLightStateChanged() was called");
 452
 453         if (System.currentTimeMillis() <= endBypassTime) {
 454             logger.debug("Bypass light update after command ({}).", lightId);
 455             return false;
 456         }
 457
 458         State state = fullLight.getState();
 459
 460         final FullLight lastState = lastFullLight;
 461         if (lastState == null || !Objects.equals(lastState.getState(), state)) {
 462             lastFullLight = fullLight;
 463         } else {
 464             return true;
 465         }
 466
 467         logger.trace("New state for light {}", lightId);
 468
 469         initializeProperties(fullLight);
 470
 471         lastSentColorTemp = null;
 472         lastSentBrightness = null;
 473
 474         // update status (ONLINE, OFFLINE)
 475         if (state.isReachable()) {
 476             updateStatus(ThingStatus.ONLINE);
 477         } else {
 478             // we assume OFFLINE without any error (NONE), as this is an
 479             // expected state (when bulb powered off)
 480             updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.NONE, "@text/offline.light-not-reachable");
 481         }
 482
 483         logger.debug("onLightStateChanged Light {}: on {} bri {} hue {} sat {} temp {} mode {} XY {}",
 484                 fullLight.getName(), state.isOn(), state.getBrightness(), state.getHue(), state.getSaturation(),
 485                 state.getColorTemperature(), state.getColorMode(), state.getXY());
 486
 487         HSBType hsbType = LightStateConverter.toHSBType(state);
 488         if (!state.isOn()) {
 489             hsbType = new HSBType(hsbType.getHue(), hsbType.getSaturation(), PercentType.ZERO);
 490         }
 491         updateState(CHANNEL_COLOR, hsbType);
 492
 493         PercentType brightnessPercentType = state.isOn() ? LightStateConverter.toBrightnessPercentType(state)
 494                 : PercentType.ZERO;
 495         updateState(CHANNEL_BRIGHTNESS, brightnessPercentType);
 496
 497         updateState(CHANNEL_SWITCH, OnOffType.from(state.isOn()));
 498
 499         updateState(CHANNEL_COLORTEMPERATURE,
 500                 LightStateConverter.toColorTemperaturePercentType(state, colorTemperatureCapabilties));
 501         updateState(CHANNEL_COLORTEMPERATURE_ABS, LightStateConverter.toColorTemperature(state));
 502
 503         StringType stringType = LightStateConverter.toAlertStringType(state);
 504         if (!"NULL".equals(stringType.toString())) {
 505             updateState(CHANNEL_ALERT, stringType);
 506             scheduleAlertStateRestore(stringType);
 507         }
 508
 509         return true;
 510     }
 511
 512     @Override
 513     public void channelLinked(ChannelUID channelUID) {
 514         HueClient handler = getHueClient();
 515         if (handler != null) {
 516             FullLight light = handler.getLightById(lightId);
 517             if (light != null) {
 518                 onLightStateChanged(light);
 519             }
 520         }
 521     }
 522
 523     @Override
 524     public void onLightRemoved() {
 525         updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.NONE, "@text/offline.light-removed");
 526     }
 527
 528     @Override
 529     public void onLightGone() {
 530         updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.GONE, "@text/offline.light-not-reachable");
 531     }
 532
 533     @Override
 534     public void onLightAdded(FullLight light) {
 535         onLightStateChanged(light);
 536     }
 537
 538     /**
 539      * Schedules restoration of the alert item state to {@link LightStateConverter#ALERT_MODE_NONE} after a given time.
 540      * <br>
 541      * Based on the initial command:
 542      * <ul>
 543      * <li>For {@link LightStateConverter#ALERT_MODE_SELECT} restoration will be triggered after <strong>2
 544      * seconds</strong>.
 545      * <li>For {@link LightStateConverter#ALERT_MODE_LONG_SELECT} restoration will be triggered after <strong>15
 546      * seconds</strong>.
 547      * </ul>
 548      * This method also cancels any previously scheduled restoration.
 549      *
 550      * @param command The {@link Command} sent to the item
 551      */
 552     private void scheduleAlertStateRestore(Command command) {
 553         cancelScheduledFuture();
 554         int delay = getAlertDuration(command);
 555
 556         if (delay > 0) {
 557             scheduledFuture = scheduler.schedule(() -> {
 558                 updateState(CHANNEL_ALERT, new StringType(LightStateConverter.ALERT_MODE_NONE));
 559             }, delay, TimeUnit.MILLISECONDS);
 560         }
 561     }
 562
 563     /**
 564      * This method will cancel previously scheduled alert item state
 565      * restoration.
 566      */
 567     private void cancelScheduledFuture() {
 568         ScheduledFuture<?> scheduledJob = scheduledFuture;
 569         if (scheduledJob != null) {
 570             scheduledJob.cancel(true);
 571             scheduledFuture = null;
 572         }
 573     }
 574
 575     /**
 576      * This method returns the time in <strong>milliseconds</strong> after
 577      * which, the state of the alert item has to be restored to {@link LightStateConverter#ALERT_MODE_NONE}.
 578      *
 579      * @param command The initial command sent to the alert item.
 580      * @return Based on the initial command will return:
 581      *         <ul>
 582      *         <li><strong>2000</strong> for {@link LightStateConverter#ALERT_MODE_SELECT}.
 583      *         <li><strong>15000</strong> for {@link LightStateConverter#ALERT_MODE_LONG_SELECT}.
 584      *         <li><strong>-1</strong> for any command different from the previous two.
 585      *         </ul>
 586      */
 587     private int getAlertDuration(Command command) {
 588         int delay;
 589         switch (command.toString()) {
 590             case LightStateConverter.ALERT_MODE_LONG_SELECT:
 591                 delay = 15000;
 592                 break;
 593             case LightStateConverter.ALERT_MODE_SELECT:
 594                 delay = 2000;
 595                 break;
 596             default:
 597                 delay = -1;
 598                 break;
 599         }
 600
 601         return delay;
 602     }
 603
 604     @Override
 605     public Collection<Class<? extends ThingHandlerService>> getServices() {
 606         return List.of(LightActions.class);
 607     }
 608
 609     @Override
 610     public String getLightId() {
 611         return lightId;
 612     }
 613 }