Class: Codec::BaseComposed

Inherits:
Base
  • Object
show all
Defined in:
lib/codec/composed.rb

Direct Known Subclasses

CompleteComposed

Instance Attribute Summary

Attributes inherited from Base

#id

Instance Method Summary collapse

Methods inherited from Base

#decode_with_length, #encode_with_length, #eval_length, #get_length, #get_sub_codecs

Constructor Details

#initialize(id) ⇒ BaseComposed

Returns a new instance of BaseComposed.



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# File 'lib/codec/composed.rb', line 3

def initialize(id)
  @id = id
  @subCodecs = []
end

Instance Method Details

#add_sub_codec(id_field, codec) ⇒ Object 



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# File 'lib/codec/composed.rb', line 59

def add_sub_codec(id_field,codec)
  if codec.nil?
    raise InitializeException, "Invalid codec reference in subcodec #{id_field} for codec #{@id}"
  end
  @subCodecs << [id_field, codec]
end

#build_each_field(buf, length) ⇒ Object 



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# File 'lib/codec/composed.rb', line 28

def build_each_field(buf,length)
  msg = Field.new(@id)
  working_buf = buf[0,length]
  @subCodecs.each{|id,codec|
    Logger.debug "Parsing struct field #{@id} : #{id}"
   if working_buf.length == 0
      Logger.debug "Not enough data to decode #{@id} : #{id}"
    else
      f,working_buf = codec.decode(working_buf)
      f.set_id(id)
      msg.add_sub_field(f)
   end
  }
  return msg,working_buf
end

#build_field(buf, length) ⇒ Object 



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# File 'lib/codec/composed.rb', line 44

def build_field(buf,length)
  msg,working_buf = build_each_field(buf,length)
  
  if working_buf.length > 0
    if @length_unknown 
     @remain = working_buf 
   else
      f = Field.new("PADDING")
     f.set_value(working_buf.unpack("H*").first)
     msg.add_sub_field(f)
   end
  end
  return msg
end

#decode(buf) ⇒ Object 



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# File 'lib/codec/composed.rb', line 8

def decode(buf)
  return build_each_field(buf,buf.length)
end

#encode(field) ⇒ Object 



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# File 'lib/codec/composed.rb', line 12

def encode(field)
  return "" if field.empty?
  subfields = field.get_value
  composed_encoder = subfields.zip(@subCodecs).collect {|sf,sc|
    if sf.get_id != sc.first
      raise EncodingException, "subfield #{sf.first} not correspond to subcodec #{sc.first}"
    end
    [sc.last,sf]
  } 
  out = ""
  composed_encoder.each do |subcodec,subfield|
    out += subcodec.encode(subfield)
  end
  return out
end