[mqtt.homeassistant] Implement Tag Scanner (#17852)

Signed-off-by: Cody Cutrer <cody@cutrer.us>

bundles/org.openhab.binding.mqtt.homeassistant/README.md

@@ -164,6 +164,12 @@ If a device has multiple device triggers for the same subtype (the particular bu
 | switch          | Switch | R/W | If the device is on or off.                         |
 | json-attributes | String | RO  | Additional attributes, as a serialized JSON string. |
 
+### [Tag Scanner](https://www.home-assistant.io/integrations/tag.mqtt/)
+
+| Channel ID      | Type    | R/W | Description                     |
+|-----------------|---------|-----|---------------------------------|
+| tag             | Trigger | N/A | The value of the "scanned" tag. |
+
 ### [Text](https://www.home-assistant.io/integrations/text.mqtt/)
 
 | Channel ID      | Type   | R/W | Description                                         |

bundles/org.openhab.binding.mqtt.homeassistant/src/main/java/org/openhab/binding/mqtt/homeassistant/internal/component/ComponentFactory.java

@@ -85,6 +85,8 @@ public class ComponentFactory {
                 return new Sensor(componentConfiguration, newStyleChannels);
             case "switch":
                 return new Switch(componentConfiguration, newStyleChannels);
+            case "tag":
+                return new Tag(componentConfiguration, newStyleChannels);
             case "text":
                 return new Text(componentConfiguration, newStyleChannels);
             case "update":

bundles/org.openhab.binding.mqtt.homeassistant/src/main/java/org/openhab/binding/mqtt/homeassistant/internal/component/Tag.java

@@ -0,0 +1,53 @@
+/**
+ * Copyright (c) 2010-2024 Contributors to the openHAB project
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package org.openhab.binding.mqtt.homeassistant.internal.component;
+
+import org.eclipse.jdt.annotation.NonNullByDefault;
+import org.openhab.binding.mqtt.generic.values.TextValue;
+import org.openhab.binding.mqtt.homeassistant.internal.ComponentChannelType;
+import org.openhab.binding.mqtt.homeassistant.internal.config.dto.AbstractChannelConfiguration;
+
+/**
+ * A MQTT Tag scanner, following the https://www.home-assistant.io/integrations/tag.mqtt/ specification.
+ *
+ * @author Cody Cutrer - Initial contribution
+ */
+@NonNullByDefault
+public class Tag extends AbstractComponent<Tag.ChannelConfiguration> {
+    public static final String TAG_CHANNEL_ID = "tag";
+
+    /**
+     * Configuration class for MQTT component
+     */
+    public static class ChannelConfiguration extends AbstractChannelConfiguration {
+        ChannelConfiguration() {
+            super("MQTT Tag Scanner");
+        }
+
+        protected String topic = "";
+    }
+
+    public Tag(ComponentFactory.ComponentConfiguration componentConfiguration, boolean newStyleChannels) {
+        super(componentConfiguration, ChannelConfiguration.class, newStyleChannels);
+
+        buildChannel(TAG_CHANNEL_ID, ComponentChannelType.TRIGGER, new TextValue(), getName(),
+                componentConfiguration.getUpdateListener())
+                .stateTopic(channelConfiguration.topic, channelConfiguration.getValueTemplate()).trigger(true).build();
+        finalizeChannels();
+    }
+
+    @Override
+    protected void addJsonAttributesChannel() {
+        // json_attributes are not supported
+    }
+}

bundles/org.openhab.binding.mqtt.homeassistant/src/test/java/org/openhab/binding/mqtt/homeassistant/internal/component/TagTests.java

@@ -0,0 +1,64 @@
+/**
+ * Copyright (c) 2010-2024 Contributors to the openHAB project
+ *
+ * See the NOTICE file(s) distributed with this work for additional
+ * information.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package org.openhab.binding.mqtt.homeassistant.internal.component;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+import java.util.Set;
+
+import org.eclipse.jdt.annotation.NonNullByDefault;
+import org.junit.jupiter.api.Test;
+import org.openhab.binding.mqtt.generic.values.TextValue;
+
+/**
+ * Tests for {@link Tag}
+ *
+ * @author Cody Cutrer - Initial contribution
+ */
+@NonNullByDefault
+public class TagTests extends AbstractComponentTests {
+    public static final String CONFIG_TOPIC = "tag/0AFFD2";
+
+    @SuppressWarnings("null")
+    @Test
+    public void test() throws InterruptedException {
+        var component = discoverComponent(configTopicToMqtt(CONFIG_TOPIC), """
+                {
+                    "topic": "0AFFD2/tag_scanned",
+                    "value_template": "{{ value_json.PN532.UID }}"
+                }
+                """);
+
+        assertThat(component.channels.size(), is(1));
+        assertThat(component.getName(), is("MQTT Tag Scanner"));
+
+        assertChannel(component, Tag.TAG_CHANNEL_ID, "0AFFD2/tag_scanned", "", "MQTT Tag Scanner", TextValue.class);
+
+        publishMessage("0AFFD2/tag_scanned", """
+                {
+                  "Time": "2020-09-28T17:02:10",
+                  "PN532": {
+                    "UID": "E9F35959",
+                    "DATA":"ILOVETASMOTA"
+                  }
+                }
+                """);
+        assertTriggered(component, Tag.TAG_CHANNEL_ID, "E9F35959");
+    }
+
+    @Override
+    protected Set<String> getConfigTopics() {
+        return Set.of(CONFIG_TOPIC);
+    }
+}