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   1 /**
   2  * Copyright (c) 2010-2023 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.mqtt.handler;
  14
  15 import java.util.concurrent.CompletableFuture;
  16
  17 import org.eclipse.jdt.annotation.NonNullByDefault;
  18 import org.openhab.core.io.transport.mqtt.MqttBrokerConnection;
  19 import org.openhab.core.io.transport.mqtt.MqttMessageSubscriber;
  20 import org.openhab.core.thing.ChannelUID;
  21
  22 /**
  23  * Subscribes to a state topic and calls {@link AbstractBrokerHandler#triggerChannel(ChannelUID, String)} if a value got
  24  * received.
  25  *
  26  * @author David Graeff - Initial contribution
  27  */
  28 @NonNullByDefault
  29 public class PublishTriggerChannel implements MqttMessageSubscriber {
  30     private final MqttBrokerConnection connection;
  31     private final PublishTriggerChannelConfig config;
  32     private final ChannelUID uid;
  33     private final AbstractBrokerHandler handler;
  34
  35     PublishTriggerChannel(PublishTriggerChannelConfig config, ChannelUID uid, MqttBrokerConnection connection,
  36             AbstractBrokerHandler handler) {
  37         this.config = config;
  38         this.uid = uid;
  39         this.connection = connection;
  40         this.handler = handler;
  41     }
  42
  43     CompletableFuture<Boolean> start() {
  44         return stop().thenCompose(b -> connection.subscribe(config.stateTopic, this));
  45     }
  46
  47     @Override
  48     public void processMessage(String topic, byte[] payload) {
  49         String value = new String(payload);
  50         // Check condition
  51         String expectedPayload = config.payload;
  52         if (expectedPayload != null && !value.equals(expectedPayload)) {
  53             return;
  54         }
  55         if (config.separator.isEmpty()) {
  56             handler.triggerChannel(uid, value);
  57         } else {
  58             handler.triggerChannel(uid, topic + config.separator + value);
  59         }
  60     }
  61
  62     public CompletableFuture<Boolean> stop() {
  63         return connection.unsubscribe(config.stateTopic, this);
  64     }
  65 }