[mqtt.generic] create the proper item type for channels with units (openhab#17929)

* [mqtt.generic] create the proper item type for channels with units

Signed-off-by: Cody Cutrer <[email protected]>

Author: ccutrer

bundles/org.openhab.binding.mqtt.generic/src/main/java/org/openhab/binding/mqtt/generic/values/NumberValue.java

@@ -25,10 +25,12 @@
 import org.openhab.core.library.types.QuantityType;
 import org.openhab.core.library.types.StringType;
 import org.openhab.core.library.types.UpDownType;
+import org.openhab.core.library.unit.Units;
 import org.openhab.core.types.Command;
 import org.openhab.core.types.StateDescriptionFragmentBuilder;
 import org.openhab.core.types.Type;
 import org.openhab.core.types.UnDefType;
+import org.openhab.core.types.util.UnitUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -56,14 +58,25 @@ public class NumberValue extends Value {
 
     public NumberValue(@Nullable BigDecimal min, @Nullable BigDecimal max, @Nullable BigDecimal step,
             @Nullable Unit<?> unit) {
-        super(CoreItemFactory.NUMBER, List.of(DecimalType.class, QuantityType.class, IncreaseDecreaseType.class,
+        super(getItemType(unit), List.of(DecimalType.class, QuantityType.class, IncreaseDecreaseType.class,
                 UpDownType.class, StringType.class));
         this.min = min;
         this.max = max;
         this.step = step == null ? BigDecimal.ONE : step;
         this.unit = unit;
     }
 
+    private static String getItemType(@Nullable Unit<?> unit) {
+        if (unit == null) {
+            return CoreItemFactory.NUMBER;
+        }
+        String dimension = Units.MIRED.equals(unit) ? "Temperature" : UnitUtils.getDimensionName(unit);
+        if (dimension == null) {
+            return CoreItemFactory.NUMBER;
+        }
+        return CoreItemFactory.NUMBER + ":" + dimension;
+    }
+
     protected boolean checkConditions(BigDecimal newValue) {
         BigDecimal min = this.min;
         if (min != null && newValue.compareTo(min) == -1) {

bundles/org.openhab.binding.mqtt.generic/src/test/java/org/openhab/binding/mqtt/generic/values/ValueTests.java

@@ -229,6 +229,12 @@ public void numberPercentageUpdate() {
         assertThat(v.getMQTTpublishValue(command, null), is("20"));
     }
 
+    @Test
+    public void numberDimension() {
+        NumberValue v = new NumberValue(null, null, new BigDecimal(10), Units.MIRED);
+        assertThat(v.getItemType(), is("Number:Temperature"));
+    }
+
     @Test
     public void rollershutterUpdateWithStrings() {
         RollershutterValue v = new RollershutterValue("fancyON", "fancyOff", "fancyStop");