Implemented Color Mode channel for the Extended Color Light.

Signed-off-by: Alexander Kostadinov <[email protected]>

extensions/binding/org.eclipse.smarthome.binding.hue/src/main/java/org/eclipse/smarthome/binding/hue/handler/LightStateConverter.java

@@ -16,6 +16,7 @@
 import org.eclipse.jdt.annotation.Nullable;
 import org.eclipse.smarthome.binding.hue.internal.State;
 import org.eclipse.smarthome.binding.hue.internal.State.AlertMode;
+import org.eclipse.smarthome.binding.hue.internal.State.ColorMode;
 import org.eclipse.smarthome.binding.hue.internal.State.Effect;
 import org.eclipse.smarthome.binding.hue.internal.StateUpdate;
 import org.eclipse.smarthome.core.library.types.DecimalType;
@@ -48,6 +49,7 @@ public class LightStateConverter {
     private static final int MAX_COLOR_TEMPERATURE = 500;
     private static final int COLOR_TEMPERATURE_RANGE = MAX_COLOR_TEMPERATURE - MIN_COLOR_TEMPERATURE;
 
+
     /**
      * {@value #ALERT_MODE_NONE}. The light is not performing an alert effect.
      */
@@ -164,9 +166,16 @@ public static int toAdjustedColorTemp(IncreaseDecreaseType type, int currentColo
      * the color temperature.
      *
      * @param lightState light state
-     * @return percent type representing the color temperature
+     * @return percent type representing the color temperature or null
+     *         if the bulb's {@link ColorMode} denotes the value is not applicable for setting color temperature
+     *         (i.e. the bulb's color mode is not {@link ColorMode.CT}).
      */
-    public static PercentType toColorTemperaturePercentType(State lightState) {
+    public static @Nullable PercentType toColorTemperaturePercentType(State lightState) {
+        ColorMode colorMode = lightState.getColorMode();
+        if (colorMode != null && !colorMode.equals(ColorMode.CT)) {
+            return null;
+        }
+
         int percent = (int) Math
                 .round(((lightState.getColorTemperature() - MIN_COLOR_TEMPERATURE) * 100.0) / COLOR_TEMPERATURE_RANGE);
         return new PercentType(restrictToBounds(percent));