Class: Cql::Protocol::TypeConverter

Inherits:
Object
  • Object
show all
Includes:
Decoding, Encoding
Defined in:
lib/cql/protocol/type_converter.rb

Instance Method Summary collapse

Methods included from Encoding

#write_bytes, #write_consistency, #write_decimal, #write_double, #write_float, #write_int, #write_long, #write_long_string, #write_short, #write_short_bytes, #write_string, #write_string_list, #write_string_map, #write_uuid, #write_varint

Methods included from Decoding

#read_byte!, #read_bytes!, #read_consistency!, #read_decimal!, #read_double!, #read_float!, #read_inet!, #read_int!, #read_long!, #read_long_string!, #read_option!, #read_short!, #read_short_bytes!, #read_string!, #read_string_list!, #read_string_map!, #read_string_multimap!, #read_uuid!, #read_varint!

Constructor Details

#initialize ⇒ TypeConverter

Returns a new instance of TypeConverter.



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# File 'lib/cql/protocol/type_converter.rb', line 13

def initialize
  @from_bytes_converters = from_bytes_converters
  @to_bytes_converters = to_bytes_converters
end

Instance Method Details

#from_bytes(buffer, type, size_bytes = 4) ⇒ Object 



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# File 'lib/cql/protocol/type_converter.rb', line 18

def from_bytes(buffer, type, size_bytes=4)
  return nil if buffer.empty?
  case type
  when Array
    return nil unless read_size(buffer, size_bytes)
    case type.first
    when :list
      bytes_to_list(buffer, @from_bytes_converters[type[1]])
    when :map
      bytes_to_map(buffer, @from_bytes_converters[type[1]], @from_bytes_converters[type[2]])
    when :set
      bytes_to_set(buffer, @from_bytes_converters[type[1]])
    end
  else
    @from_bytes_converters[type].call(buffer, size_bytes)
  end
end

#to_bytes(io, type, value, size_bytes = 4) ⇒ Object 



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# File 'lib/cql/protocol/type_converter.rb', line 36

def to_bytes(io, type, value, size_bytes=4)
  case type
  when Array
    unless value.nil? || value.is_a?(Enumerable)
      raise InvalidValueError, 'Value for collection must be enumerable'
    end
    case type.first
    when :list, :set
      _, sub_type = type
      if value
        raw = ''
        write_short(raw, value.size)
        value.each do |element|
          to_bytes(raw, sub_type, element, 2)
        end
        write_bytes(io, raw)
      else
        nil_to_bytes(io, size_bytes)
      end
    when :map
      _, key_type, value_type = type
      if value
        raw = ''
        write_short(raw, value.size)
        value.each do |key, value|
          to_bytes(raw, key_type, key, 2)
          to_bytes(raw, value_type, value, 2)
        end
        write_bytes(io, raw)
      else
        nil_to_bytes(io, size_bytes)
      end
    else
      raise UnsupportedColumnTypeError, %(Unsupported column collection type: #{type.first})
    end
  else
    converter = @to_bytes_converters[type]
    unless converter
      raise UnsupportedColumnTypeError, %(Unsupported column type: #{type})
    end
    converter.call(io, value, size_bytes)
  end
rescue TypeError => e
  raise TypeError, %("#{value}" cannot be encoded as #{type.to_s.upcase}: #{e.message}), e.backtrace
end