Fix docstring

homeassistant/components/counter/trigger.py

@@ -1,11 +1,6 @@
 """Provides triggers for counters."""
 
-from homeassistant.const import (
-    CONF_MAXIMUM,
-    CONF_MINIMUM,
-    STATE_UNAVAILABLE,
-    STATE_UNKNOWN,
-)
+from homeassistant.const import CONF_MAXIMUM, CONF_MINIMUM
 from homeassistant.core import HomeAssistant, State
 from homeassistant.helpers.automation import DomainSpec
 from homeassistant.helpers.trigger import (
@@ -41,9 +36,7 @@ class CounterDecrementedTrigger(CounterBaseIntegerTrigger):
     """Trigger for when a counter is decremented."""
 
     def is_valid_transition(self, from_state: State, to_state: State) -> bool:
-        """Check if the origin state is valid and the state has changed."""
-        if from_state.state in (STATE_UNAVAILABLE, STATE_UNKNOWN):
-            return False
+        """Check that the counter value decreased."""
         return int(from_state.state) > int(to_state.state)
 
 
@@ -51,9 +44,7 @@ class CounterIncrementedTrigger(CounterBaseIntegerTrigger):
     """Trigger for when a counter is incremented."""
 
     def is_valid_transition(self, from_state: State, to_state: State) -> bool:
-        """Check if the origin state is valid and the state has changed."""
-        if from_state.state in (STATE_UNAVAILABLE, STATE_UNKNOWN):
-            return False
+        """Check that the counter value increased."""
         return int(from_state.state) < int(to_state.state)
 
 
@@ -62,12 +53,6 @@ class CounterValueBaseTrigger(EntityTriggerBase):
 
     _domain_specs = {DOMAIN: DomainSpec()}
 
-    def is_valid_transition(self, from_state: State, to_state: State) -> bool:
-        """Check if the origin state is valid and the state has changed."""
-        if from_state.state in (STATE_UNAVAILABLE, STATE_UNKNOWN):
-            return False
-        return from_state.state != to_state.state
-
 
 class CounterMaxReachedTrigger(CounterValueBaseTrigger):
     """Trigger for when a counter reaches its maximum value."""

homeassistant/components/cover/trigger.py

@@ -2,7 +2,7 @@
 
 from collections.abc import Mapping
 
-from homeassistant.const import STATE_OFF, STATE_ON, STATE_UNAVAILABLE, STATE_UNKNOWN
+from homeassistant.const import STATE_OFF, STATE_ON
 from homeassistant.core import HomeAssistant, State
 from homeassistant.helpers.trigger import EntityTriggerBase, Trigger
 
@@ -28,9 +28,7 @@ class CoverTriggerBase(EntityTriggerBase):
         return self._get_value(state) == domain_spec.target_value
 
     def is_valid_transition(self, from_state: State, to_state: State) -> bool:
-        """Check if the transition is valid for a cover state change."""
-        if from_state.state in (STATE_UNAVAILABLE, STATE_UNKNOWN):
-            return False
+        """Check that the relevant cover value changed."""
         if (from_value := self._get_value(from_state)) is None:
             return False
         return from_value != self._get_value(to_state)

homeassistant/components/doorbell/trigger.py

@@ -17,10 +17,8 @@ class DoorbellRangTrigger(StatelessEntityTriggerBase):
     _domain_specs = {EVENT_DOMAIN: DomainSpec(device_class=EventDeviceClass.DOORBELL)}
 
     def is_valid_state(self, state: State) -> bool:
-        """Check if the entity is available and the event type is ring."""
-        return super().is_valid_state(state) and (
-            state.attributes.get(ATTR_EVENT_TYPE) == DoorbellEventType.RING
-        )
+        """Check if the event type is ring."""
+        return state.attributes.get(ATTR_EVENT_TYPE) == DoorbellEventType.RING
 
 
 TRIGGERS: dict[str, type[Trigger]] = {

homeassistant/components/event/trigger.py

@@ -41,9 +41,7 @@ class EventReceivedTrigger(StatelessEntityTriggerBase):
 
     def is_valid_state(self, state: State) -> bool:
         """Check if the event type matches one of the configured types."""
-        return super().is_valid_state(state) and (
-            state.attributes.get(ATTR_EVENT_TYPE) in self._event_types
-        )
+        return state.attributes.get(ATTR_EVENT_TYPE) in self._event_types
 
 
 TRIGGERS: dict[str, type[Trigger]] = {

homeassistant/components/media_player/trigger.py

@@ -1,6 +1,5 @@
 """Provides triggers for media players."""
 
-from homeassistant.const import STATE_UNAVAILABLE, STATE_UNKNOWN
 from homeassistant.core import HomeAssistant, State
 from homeassistant.helpers.automation import DomainSpec
 from homeassistant.helpers.trigger import (
@@ -50,10 +49,7 @@ class _MediaPlayerMutedStateTriggerBase(EntityTriggerBase):
         )
 
     def is_valid_transition(self, from_state: State, to_state: State) -> bool:
-        """Check if the origin state is valid and the state has changed."""
-        if from_state.state in (STATE_UNAVAILABLE, STATE_UNKNOWN):
-            return False
-
+        """Check that the muted-state changed."""
         if not self._has_volume_attributes(to_state):
             return False
 

homeassistant/components/schedule/trigger.py

@@ -1,6 +1,6 @@
 """Provides triggers for schedules."""
 
-from homeassistant.const import STATE_OFF, STATE_ON, STATE_UNAVAILABLE, STATE_UNKNOWN
+from homeassistant.const import STATE_OFF, STATE_ON
 from homeassistant.core import HomeAssistant, State
 from homeassistant.helpers.automation import DomainSpec
 from homeassistant.helpers.trigger import (
@@ -20,10 +20,7 @@ class ScheduleBackToBackTrigger(EntityTransitionTriggerBase):
     _to_states = {STATE_ON}
 
     def is_valid_transition(self, from_state: State, to_state: State) -> bool:
-        """Check if the origin state matches the expected ones."""
-        if from_state.state in (STATE_UNAVAILABLE, STATE_UNKNOWN):
-            return False
-
+        """Check that the origin matches and the next event changed."""
         from_next_event = from_state.attributes.get(ATTR_NEXT_EVENT)
         to_next_event = to_state.attributes.get(ATTR_NEXT_EVENT)
 

homeassistant/components/select/trigger.py

@@ -1,8 +1,7 @@
 """Provides triggers for selects."""
 
 from homeassistant.components.input_select import DOMAIN as INPUT_SELECT_DOMAIN
-from homeassistant.const import STATE_UNAVAILABLE, STATE_UNKNOWN
-from homeassistant.core import HomeAssistant, State
+from homeassistant.core import HomeAssistant
 from homeassistant.helpers.automation import DomainSpec
 from homeassistant.helpers.trigger import (
     ENTITY_STATE_TRIGGER_SCHEMA,
@@ -19,16 +18,6 @@ class SelectionChangedTrigger(EntityTriggerBase):
     _domain_specs = {DOMAIN: DomainSpec(), INPUT_SELECT_DOMAIN: DomainSpec()}
     _schema = ENTITY_STATE_TRIGGER_SCHEMA
 
-    def is_valid_transition(self, from_state: State, to_state: State) -> bool:
-        """Check if the origin state is valid and the state has changed."""
-        if from_state.state in (STATE_UNAVAILABLE, STATE_UNKNOWN):
-            return False
-        return from_state.state != to_state.state
-
-    def is_valid_state(self, state: State) -> bool:
-        """Check if the new state is not invalid."""
-        return state.state not in (STATE_UNAVAILABLE, STATE_UNKNOWN)
-
 
 TRIGGERS: dict[str, type[Trigger]] = {
     "selection_changed": SelectionChangedTrigger,

homeassistant/components/text/trigger.py

@@ -1,8 +1,7 @@
 """Provides triggers for text and input_text entities."""
 
 from homeassistant.components.input_text import DOMAIN as INPUT_TEXT_DOMAIN
-from homeassistant.const import STATE_UNAVAILABLE, STATE_UNKNOWN
-from homeassistant.core import HomeAssistant, State
+from homeassistant.core import HomeAssistant
 from homeassistant.helpers.automation import DomainSpec
 from homeassistant.helpers.trigger import (
     ENTITY_STATE_TRIGGER_SCHEMA,
@@ -19,16 +18,6 @@ class TextChangedTrigger(EntityTriggerBase):
     _domain_specs = {DOMAIN: DomainSpec(), INPUT_TEXT_DOMAIN: DomainSpec()}
     _schema = ENTITY_STATE_TRIGGER_SCHEMA
 
-    def is_valid_transition(self, from_state: State, to_state: State) -> bool:
-        """Check if the origin state is valid and the state has changed."""
-        if from_state.state in (STATE_UNAVAILABLE, STATE_UNKNOWN):
-            return False
-        return from_state.state != to_state.state
-
-    def is_valid_state(self, state: State) -> bool:
-        """Check if the new state is not invalid."""
-        return state.state not in (STATE_UNAVAILABLE, STATE_UNKNOWN)
-
 
 TRIGGERS: dict[str, type[Trigger]] = {
     "changed": TextChangedTrigger,

homeassistant/helpers/trigger.py

@@ -353,9 +353,14 @@ class EntityTriggerBase(Trigger):
     """Trigger for entity state changes."""
 
     _domain_specs: Mapping[str, DomainSpec]
+    # States filtered from the to_state pre-filter (and `_should_include`).
     _excluded_states: Final[frozenset[str]] = frozenset(
         {STATE_UNAVAILABLE, STATE_UNKNOWN}
     )
+    # States filtered from the from_state pre-filter. Defaults to
+    # `_excluded_states`. Subclasses can override to relax the origin
+    # check.
+    _excluded_from_states: ClassVar[frozenset[str]] = _excluded_states
     _schema: vol.Schema = ENTITY_STATE_TRIGGER_SCHEMA_FIRST_LAST
     # When True, indirect target expansion (via device/area/floor) skips
     # entities with an entity_category.
@@ -389,13 +394,28 @@ class EntityTriggerBase(Trigger):
             return state.state
         return state.attributes.get(domain_spec.value_source)
 
-    @abc.abstractmethod
     def is_valid_transition(self, from_state: State, to_state: State) -> bool:
-        """Check if the origin state is valid and the state has changed."""
+        """Check if the transition should fire the trigger.
+
+        Called only after `from_state.state` has been filtered against
+        `_excluded_from_states` and `to_state.state` against
+        `_excluded_states`, so subclasses don't need to repeat those
+        checks. Default: any state change. Override to add semantics
+        (specific from/to states, value changed across a threshold,
+        etc.).
+        """
+        return from_state.state != to_state.state
 
-    @abc.abstractmethod
     def is_valid_state(self, state: State) -> bool:
-        """Check if the new state matches the expected state(s)."""
+        """Check if the state is a target state for the trigger.
+
+        Called only after `state.state` has been filtered against
+        `_excluded_states`, so subclasses don't need to repeat that
+        check. Default: any non-excluded state is a target. Override
+        to restrict (specific to_states, value within a threshold,
+        etc.).
+        """
+        return True
 
     def _should_include(self, state: State) -> bool:
         """Check if an entity should participate in all/count checks.
@@ -473,19 +493,26 @@ class EntityTriggerBase(Trigger):
                     )
                     return matches >= 1
                 # Behavior any: check the individual entity's state
-                if not to_state:
+                if not to_state or to_state.state in self._excluded_states:
                     return False
                 return self.is_valid_state(to_state)
 
             if not from_state or not to_state:
                 return
 
-            # The trigger should never fire if the new state is not valid
-            if not self.is_valid_state(to_state):
+            # The trigger should never fire if the new state is excluded
+            # or not a target state.
+            if to_state.state in self._excluded_states or not self.is_valid_state(
+                to_state
+            ):
                 return
 
-            # The trigger should never fire if the transition is not valid
-            if not self.is_valid_transition(from_state, to_state):
+            # The trigger should never fire if the origin state is excluded
+            # or the transition is not valid.
+            if (
+                from_state.state in self._excluded_from_states
+                or not self.is_valid_transition(from_state, to_state)
+            ):
                 return
 
             if behavior == BEHAVIOR_LAST:
@@ -570,10 +597,7 @@ class EntityTargetStateTriggerBase(EntityTriggerBase):
     _to_states: set[str]
 
     def is_valid_transition(self, from_state: State, to_state: State) -> bool:
-        """Check if the origin state is valid and the state has changed."""
-        if from_state.state in (STATE_UNAVAILABLE, STATE_UNKNOWN):
-            return False
-
+        """Check the value changed and the origin was not already a target state."""
         from_value = self._get_tracked_value(from_state)
         return (
             from_value != self._get_tracked_value(to_state)
@@ -593,9 +617,6 @@ class EntityTransitionTriggerBase(EntityTriggerBase):
 
     def is_valid_transition(self, from_state: State, to_state: State) -> bool:
         """Check if the origin state matches the expected ones."""
-        if from_state.state in (STATE_UNAVAILABLE, STATE_UNKNOWN):
-            return False
-
         from_value = self._get_tracked_value(from_state)
         return (
             from_value != self._get_tracked_value(to_state)
@@ -620,10 +641,8 @@ class EntityOriginStateTriggerBase(EntityTriggerBase):
         )
 
     def is_valid_state(self, state: State) -> bool:
-        """Check if the new state is valid."""
-        return state.state not in (STATE_UNAVAILABLE, STATE_UNKNOWN) and bool(
-            self._get_tracked_value(state) != self._from_state
-        )
+        """Check that the new state is different from the origin state."""
+        return bool(self._get_tracked_value(state) != self._from_state)
 
 
 class StatelessEntityTriggerBase(EntityTriggerBase):
@@ -631,23 +650,12 @@ class StatelessEntityTriggerBase(EntityTriggerBase):
 
     Used for stateless entities (buttons, scenes, doorbells, events)
     whose `state.state` is just a timestamp of the last activation.
+    `STATE_UNKNOWN` is a legitimate prior state — the first activation
+    after startup must still fire the trigger.
     """
 
     _schema: vol.Schema = ENTITY_STATE_TRIGGER_SCHEMA
-
-    def is_valid_transition(self, from_state: State, to_state: State) -> bool:
-        """Check if the origin state is available and the state has changed.
-
-        STATE_UNKNOWN is allowed as the origin state so the first
-        activation fires.
-        """
-        if from_state.state == STATE_UNAVAILABLE:
-            return False
-        return from_state.state != to_state.state
-
-    def is_valid_state(self, state: State) -> bool:
-        """Check that the entity has been activated at least once."""
-        return state.state not in self._excluded_states
+    _excluded_from_states: ClassVar[frozenset[str]] = frozenset({STATE_UNAVAILABLE})
 
 
 NUMERICAL_ATTRIBUTE_CHANGED_TRIGGER_SCHEMA = ENTITY_STATE_TRIGGER_SCHEMA.extend(
@@ -826,10 +834,7 @@ class EntityNumericalStateChangedTriggerBase(EntityNumericalStateTriggerBase):
     _schema = NUMERICAL_ATTRIBUTE_CHANGED_TRIGGER_SCHEMA
 
     def is_valid_transition(self, from_state: State, to_state: State) -> bool:
-        """Check if the origin state is valid and the state has changed."""
-        if from_state.state in (STATE_UNAVAILABLE, STATE_UNKNOWN):
-            return False
-
+        """Check if the tracked numeric value has changed."""
         return self._get_tracked_value(from_state) != self._get_tracked_value(to_state)
 
 
@@ -888,10 +893,7 @@ class EntityNumericalStateCrossedThresholdTriggerBase(EntityNumericalStateTrigge
     _schema = NUMERICAL_ATTRIBUTE_CROSSED_THRESHOLD_SCHEMA
 
     def is_valid_transition(self, from_state: State, to_state: State) -> bool:
-        """Check if the origin state is valid and the state has changed."""
-        if from_state.state in (STATE_UNAVAILABLE, STATE_UNKNOWN):
-            return False
-
+        """Check that the tracked value crossed into the threshold range."""
         return not self.is_valid_state(from_state)
 
 

tests/helpers/test_trigger.py

@@ -2969,10 +2969,6 @@ async def test_make_entity_target_state_trigger(
     # Value did not change — not a valid transition
     assert not trig.is_valid_transition(from_state, from_state)
 
-    # From unavailable — not valid
-    unavailable = State("light.bed", STATE_UNAVAILABLE, {})
-    assert not trig.is_valid_transition(unavailable, to_state)
-
     # Value not in to_states — not valid
     assert not trig.is_valid_state(wrong_value_state)
 
@@ -3043,10 +3039,6 @@ async def test_make_entity_transition_trigger(
     # No change in tracked value — not a valid transition
     assert not trig.is_valid_transition(from_state, from_state)
 
-    # From unavailable — not valid
-    unavailable = State("climate.living", STATE_UNAVAILABLE, {})
-    assert not trig.is_valid_transition(unavailable, to_state)
-
 
 @pytest.mark.parametrize(
     ("domain_specs", "origin", "from_state", "to_state", "wrong_from"),