Class: EmuPower::Notifications::Notification

Inherits:
Object
  • Object
show all
Defined in:
lib/emu_power/notifications.rb

Overview

Base class for notifications

Constant Summary collapse

UNIX_TIME_OFFSET =

Timestamp of Jan 1st 2000. Used to shift epoch to standard timestamp.

946684800

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(hash) ⇒ Notification

Returns a new instance of Notification.



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# File 'lib/emu_power/notifications.rb', line 19

def initialize(hash)

  @raw = hash

  # All messages may contain this metadata
  @device_mac = @raw['DeviceMacId']
  @meter_mac = @raw['MeterMacId']

  # The EMU sets timestamps relative to Jan 1st 2000 UTC. We convert
  # these into more standard Unix epoch timestamps by adding the
  # appropriate offset.
  @timestamp = parse_timestamp('TimeStamp')

  # Build out type-specific fields
  build(hash)

end

Instance Attribute Details

#device_mac ⇒ Object

Returns the value of attribute device_mac.



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# File 'lib/emu_power/notifications.rb', line 15

def device_mac
  @device_mac
end

#meter_mac ⇒ Object

Returns the value of attribute meter_mac.



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# File 'lib/emu_power/notifications.rb', line 16

def meter_mac
  @meter_mac
end

#raw ⇒ Object

Returns the value of attribute raw.



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# File 'lib/emu_power/notifications.rb', line 14

def raw
  @raw
end

#timestamp ⇒ Object

Returns the value of attribute timestamp.



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# File 'lib/emu_power/notifications.rb', line 17

def timestamp
  @timestamp
end

Class Method Details

.root_name ⇒ Object

Name of the XML root object corresponding to this type



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# File 'lib/emu_power/notifications.rb', line 76

def self.root_name
  return self.name.split('::').last
end

.subclasses ⇒ Object 



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# File 'lib/emu_power/notifications.rb', line 80

def self.subclasses
  return ObjectSpace.each_object(::Class).select do |k|
    k < self
  end
end

Instance Method Details

#build(hash) ⇒ Object 



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# File 'lib/emu_power/notifications.rb', line 37

def build(hash)
  # Overridden by subclasses
end

#parse_amount(prop, mul_prop = 'Multiplier', div_prop = 'Divisor') ⇒ Object

Calculate real total from divisors and multipliers



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# File 'lib/emu_power/notifications.rb', line 60

def parse_amount(prop, mul_prop = 'Multiplier', div_prop = 'Divisor')

  multiplier = parse_hex(mul_prop)
  divisor = parse_hex(div_prop)
  v = parse_hex(prop)

  return 0.0 if v.nil? || multiplier.nil? || divisor.nil?
  return multiplier * v / Float(divisor)

end

#parse_bool(prop) ⇒ Object 



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# File 'lib/emu_power/notifications.rb', line 53

def parse_bool(prop)
  v = @raw[prop]
  return nil if v.nil?
  return (@raw[prop] == 'Y') ? true : false
end

#parse_hex(prop) ⇒ Object 



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# File 'lib/emu_power/notifications.rb', line 47

def parse_hex(prop)
  v = @raw[prop]
  return nil if v.nil?
  return Integer(v)
end

#parse_timestamp(prop) ⇒ Object 



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# File 'lib/emu_power/notifications.rb', line 41

def parse_timestamp(prop)
  v = @raw[prop]
  return nil if v == nil
  return Integer(v) + 946684800
end

#to_s ⇒ Object 



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# File 'lib/emu_power/notifications.rb', line 71

def to_s
  "#{self.class.root_name} Notification: #{@raw.to_s}"
end