Class: Innodb::DataType::IntegerType

Inherits:
Object
  • Object
show all
Defined in:
lib/innodb/data_type.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(base_type, modifiers, properties) ⇒ IntegerType

Returns a new instance of IntegerType.



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# File 'lib/innodb/data_type.rb', line 28

def initialize(base_type, modifiers, properties)
  @width = base_type_width_map[base_type]
  @unsigned = properties.include?(:UNSIGNED)
  @name = Innodb::DataType.make_name(base_type, modifiers, properties)
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/innodb/data_type.rb', line 26

def name
  @name
end

#width ⇒ Object (readonly)

Returns the value of attribute width.



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# File 'lib/innodb/data_type.rb', line 26

def width
  @width
end

Instance Method Details

#base_type_width_map ⇒ Object 



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# File 'lib/innodb/data_type.rb', line 34

def base_type_width_map
  {
    :BOOL       => 1,
    :BOOLEAN    => 1,
    :TINYINT    => 1,
    :SMALLINT   => 2,
    :MEDIUMINT  => 3,
    :INT        => 4,
    :INT6       => 6,
    :BIGINT     => 8,
  }
end

#get_int(data, nbits) ⇒ Object 



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# File 'lib/innodb/data_type.rb', line 56

def get_int(data, nbits)
  BinData::const_get("Int%dbe" % nbits).read(data) ^ (-1 << (nbits - 1))
end

#get_uint(data, nbits) ⇒ Object 



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# File 'lib/innodb/data_type.rb', line 52

def get_uint(data, nbits)
  BinData::const_get("Uint%dbe" % nbits).read(data)
end

#value(data) ⇒ Object 



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# File 'lib/innodb/data_type.rb', line 47

def value(data)
  nbits = @width * 8
  @unsigned ? get_uint(data, nbits) : get_int(data, nbits)
end