Class: Cosmos::Protocol

Inherits:
Object show all
Defined in:
lib/cosmos/interfaces/protocols/protocol.rb

Overview

Base class for all COSMOS protocols which defines a framework which must be implemented by a subclass.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(allow_empty_data = nil) ⇒ Protocol

to be passed down to later Protocols (instead of returning :STOP). Can be true, false, or nil, where nil is interpreted as true unless the Protocol is the last Protocol of the chain.

Parameters:

  • allow_empty_data (true/false/nil) (defaults to: nil) —

    Whether or not this protocol will allow an empty string



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# File 'lib/cosmos/interfaces/protocols/protocol.rb', line 33

def initialize(allow_empty_data = nil)
  @interface = nil
  @allow_empty_data = ConfigParser.handle_true_false_nil(allow_empty_data)
  reset()
end

Instance Attribute Details

#allow_empty_data ⇒ Object

Returns the value of attribute allow_empty_data.



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# File 'lib/cosmos/interfaces/protocols/protocol.rb', line 28

def allow_empty_data
  @allow_empty_data
end

#interface ⇒ Object

Returns the value of attribute interface.



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# File 'lib/cosmos/interfaces/protocols/protocol.rb', line 27

def interface
  @interface
end

Instance Method Details

#connect_reset ⇒ Object 



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# File 'lib/cosmos/interfaces/protocols/protocol.rb', line 42

def connect_reset
  reset()
end

#disconnect_reset ⇒ Object 



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# File 'lib/cosmos/interfaces/protocols/protocol.rb', line 46

def disconnect_reset
  reset()
end

#post_write_interface(packet, data) ⇒ Object 



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# File 'lib/cosmos/interfaces/protocols/protocol.rb', line 78

def post_write_interface(packet, data)
  return packet, data
end

#read_data(data) ⇒ Object

Ensure we have some data in case this is the only protocol



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# File 'lib/cosmos/interfaces/protocols/protocol.rb', line 51

def read_data(data)
  if data.length <= 0
    if @allow_empty_data.nil?
      if @interface and @interface.read_protocols[-1] == self
        # Last read interface in chain with auto @allow_empty_data
        return :STOP
      end
    elsif !@allow_empty_data
      # Don't @allow_empty_data means STOP
      return :STOP
    end
  end
  data
end

#read_packet(packet) ⇒ Object 



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# File 'lib/cosmos/interfaces/protocols/protocol.rb', line 66

def read_packet(packet)
  return packet
end

#reset ⇒ Object 



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# File 'lib/cosmos/interfaces/protocols/protocol.rb', line 39

def reset
end

#write_data(data) ⇒ Object 



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# File 'lib/cosmos/interfaces/protocols/protocol.rb', line 74

def write_data(data)
  return data
end

#write_packet(packet) ⇒ Object 



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# File 'lib/cosmos/interfaces/protocols/protocol.rb', line 70

def write_packet(packet)
  return packet
end