lib/tamashii/agent/device/device_base.rb in tamashii-agent-0.3.1 vs lib/tamashii/agent/device/device_base.rb in tamashii-agent-0.3.3

@@ -1,19 +1,46 @@
+require 'pi_piper'
 require 'tamashii/agent/common'
 
 module Tamashii
   module Agent
     module Device
       class DeviceBase
         include Common::Loggable
 
+        class OptionNotFoundError < RuntimeError; end
+
         def initialize(component, options = {})
           @component = component
           @options = options
         end
 
         def shutdown
           logger.warn "Device '#{self.class}' does not implement a shutdown method"
+        end
+
+        def fetch_option(name, default_value)
+          fetch_option!(name)
+        rescue OptionNotFoundError => e
+          logger.warn "No #{name} specified in options. Use default #{name}: #{default_value}"
+          return default_value
+        end
+
+        def fetch_option!(name)
+          if @options.has_key?(name)
+            return @options[name]
+          else
+            raise OptionNotFoundError, "#{name} not found in option"
+          end
+        end
+
+        def unexport_pin(pin_number)
+          raise ArgumentErrorm, "pin number must be a integer" unless pin_number.is_a? Integer
+          if PiPiper::Platform.driver == PiPiper::Bcm2835
+            PiPiper::Platform.driver.unexport_pin(pin_number)
+          else
+            logger.warn "Underlying driver #{PiPiper::Platform.driver} does not support unexporting"
+          end
         end
       end
     end
   end
 end