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Signed-off-by: Martin Grześlowski <martin.grzeslowski@gmail.com>

bundles/org.openhab.core/src/main/java/org/openhab/core/library/types/OnOffType.java

@@ -60,6 +60,10 @@ public enum OnOffType implements PrimitiveType, State, Command {
         return super.toString();
     }
 
+    public OnOffType toggle() {
+        return this == ON ? OFF : ON;
+    }
+
     @Override
     public <T extends State> @Nullable T as(@Nullable Class<T> target) {
         if (target == DecimalType.class) {

bundles/org.openhab.core/src/main/java/org/openhab/core/library/types/OpenClosedType.java

@@ -42,6 +42,10 @@ public enum OpenClosedType implements PrimitiveType, State, Command {
         return super.toString();
     }
 
+    public OpenClosedType toggle() {
+        return this == OPEN ? CLOSED : OPEN;
+    }
+
     @Override
     public <T extends State> @Nullable T as(@Nullable Class<T> target) {
         if (target == DecimalType.class) {

bundles/org.openhab.core/src/main/java/org/openhab/core/library/types/PlayPauseType.java

@@ -42,4 +42,8 @@ public enum PlayPauseType implements PrimitiveType, State, Command {
     public String toFullString() {
         return super.toString();
     }
+
+    public PlayPauseType toggle() {
+        return this == PLAY ? PAUSE : PLAY;
+    }
 }

bundles/org.openhab.core/src/main/java/org/openhab/core/library/types/UpDownType.java

@@ -44,6 +44,10 @@ public enum UpDownType implements PrimitiveType, State, Command {
         return super.toString();
     }
 
+    public UpDownType toggle() {
+        return this == UP ? DOWN : UP;
+    }
+
     @Override
     public <T extends State> @Nullable T as(@Nullable Class<T> target) {
         if (target == DecimalType.class) {