Class: MTP::Properties::PropertyDescription

Inherits:
Object
  • Object
show all
Defined in:
lib/mtp/properties.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#datatype ⇒ Object (readonly)

Returns the value of attribute datatype.



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# File 'lib/mtp/properties.rb', line 99

def datatype
  @datatype
end

#form ⇒ Object (readonly)

Returns the value of attribute form.



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# File 'lib/mtp/properties.rb', line 99

def form
  @form
end

Class Method Details

.load(ph, code, format) ⇒ Object 



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# File 'lib/mtp/properties.rb', line 100

def self.load(ph, code, format)
  prop_desc = PropertyDescription.new
  t = ph.transaction.get_object_prop_desc(code, format)
  t.expect("OK")
  prop_desc.instance_eval do
    @format = format
    @code, @datatype, @access, str = t.data.payload.unpack("KSCa*")
    @dts = Datacode.new(@datatype, MTP::DATA_TYPE_PACK)
    @datatype = Datacode.new(@datatype, MTP::DATA_TYPES)
    @default_value, group_code, form_flag, form =
      str.unpack("#{@dts.name}VCa*")
    @form = Forms.load(form_flag, form, @dts)
  end
  prop_desc
end

Instance Method Details

#pack(value) ⇒ Object 



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# File 'lib/mtp/properties.rb', line 124

def pack(value)
  @form.pack(@datatype, @dts, value)
end

#unpack(raw_value) ⇒ Object 



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# File 'lib/mtp/properties.rb', line 116

def unpack(raw_value)
  if raw_value.empty?
    nil
  else
    @form.unpack(@datatype, @dts, raw_value)
  end
end

#writable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mtp/properties.rb', line 128

def writable?
  @access == 1
end