Add event attributes for TimerEvent (#131)

This may be useful especially for UI rules

Signed-off-by: Jimmy Tanagra <[email protected]>

lib/openhab/core/events/abstract_event.rb

@@ -15,6 +15,17 @@ class AbstractEvent
 
         # @return [String]
         alias_method :inspect, :to_s
+
+        #
+        # Returns the event payload as a Hash.
+        #
+        # @return [Hash, nil] The payload object parsed by JSON. The keys are symbolized.
+        #   `nil` when the payload is empty.
+        #
+        def payload
+          require "json"
+          @payload ||= JSON.parse(get_payload, symbolize_names: true) unless get_payload.empty?
+        end
       end
     end
   end

lib/openhab/core/events/timer_event.rb

@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+module OpenHAB
+  module Core
+    module Events
+      # @deprecated OH3.4 this guard is not needed on OH4
+      if Gem::Version.new(OpenHAB::Core::VERSION) >= Gem::Version.new("4.0.0")
+        java_import org.openhab.core.automation.events.TimerEvent
+
+        #
+        # Adds methods to core openHAB TimerEvent to make it more natural in Ruby
+        #
+        # This event can be triggered by a `DateTimeTrigger`, `cron`, or `TimeOfDay` trigger.
+        #
+        # @since openHAB 4.0
+        #
+        class TimerEvent < AbstractEvent
+          #
+          # @!attribute [r] cron_expression
+          # @return [String, nil] The cron expression that triggered this event.
+          #   `nil` when this event wasn't triggered by a cron trigger.
+          #
+          def cron_expression
+            payload&.[](:cronExpression)
+          end
+
+          #
+          # @!attribute [r] item
+          # @return [Item, nil] The DateTime item that triggered this event.
+          #   `nil` when this event wasn't triggered by a DateTimeItem trigger.
+          #
+          def item
+            payload&.[](:itemName)&.then { |item_name| EntityLookup.lookup_item(item_name) }
+          end
+
+          #
+          # @!attribute [r] time
+          # @return [LocalTime, nil] The configured time for this TimeOfDay trigger event.
+          #   `nil` when this event wasn't triggered by a TimeOfDay trigger.
+          #
+          def time
+            payload&.[](:time)&.then { |time| LocalTime.parse(time) }
+          end
+        end
+      end
+    end
+  end
+end

spec/openhab/core/events/timer_event_spec.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+# @deprecated OH3.4 - this guard is not needed on OH4
+if Gem::Version.new(OpenHAB::Core::VERSION) >= Gem::Version.new("4.0.0")
+
+  RSpec.describe OpenHAB::Core::Events::TimerEvent do
+    describe "#cron_expression" do
+      it "works" do
+        expression = (Time.now + 2).strftime("%S %M %H ? * ?")
+        event = described_class.new("topic", %({"cronExpression":"#{expression}"}), nil)
+        expect(event.cron_expression).to eql expression
+      end
+    end
+
+    describe "#item" do
+      it "works" do
+        items.build { date_time_item MyDateTimeItem }
+        event = described_class.new("topic", %({"itemName":"MyDateTimeItem"}), nil)
+        expect(event.item).to be_an(Item)
+        expect(event.item).to eql MyDateTimeItem
+      end
+    end
+
+    describe "#time" do
+      it "works" do
+        event = described_class.new("topic", %({"time":"12:34"}), nil)
+        expect(event.time).to be_a(java.time.LocalTime)
+        expect(event.time).to eq LocalTime.parse("12:34")
+      end
+    end
+  end
+
+end