Class: Hypostasis::Tuple

Inherits:
Object
  • Object
show all
Defined in:
lib/hypostasis/tuple.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*tuple) ⇒ Tuple

Returns a new instance of Tuple.

Raises:



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# File 'lib/hypostasis/tuple.rb', line 2

def initialize(*tuple)
  @tuple = tuple.to_a.flatten
  raise Hypostasis::Errors::InvalidTuple if @tuple.empty?
  self
end

Class Method Details

.unpack(tuple_string) ⇒ Object 



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# File 'lib/hypostasis/tuple.rb', line 47

def self.unpack(tuple_string)
  Hypostasis::Tuple.new(FDB::Tuple.unpack(tuple_string))
end

Instance Method Details

#append(*extension) ⇒ Object 



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# File 'lib/hypostasis/tuple.rb', line 22

def append(*extension)
  return self if extension.empty?
  appended_tuple = @tuple + extension.to_a
  Hypostasis::Tuple.new(appended_tuple)
end

#prepend(*prefix) ⇒ Object 



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# File 'lib/hypostasis/tuple.rb', line 16

def prepend(*prefix)
  return self if prefix.empty?
  prepended_tuple = prefix.to_a + @tuple
  Hypostasis::Tuple.new(prepended_tuple)
end

#to_a ⇒ Object 



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# File 'lib/hypostasis/tuple.rb', line 8

def to_a
  @tuple
end

#to_range ⇒ Object 



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# File 'lib/hypostasis/tuple.rb', line 43

def to_range
  FDB::Tuple.range(@tuple)
end

#to_s ⇒ Object 



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# File 'lib/hypostasis/tuple.rb', line 12

def to_s
  @tuple_str ||= FDB::Tuple.pack(@tuple)
end

#trim(count = 0) ⇒ Object

Raises:



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# File 'lib/hypostasis/tuple.rb', line 28

def trim(count = 0)
  count = count.to_i
  raise Hypostasis::Errors::TupleExhausted if count.abs > @tuple.size - 1
  trimmed_tuple = @tuple
  if count > 0
    trimmed_tuple.pop(count.abs)
    Hypostasis::Tuple.new(trimmed_tuple)
  elsif count < 0
    trimmed_tuple.shift(count.abs)
    Hypostasis::Tuple.new(trimmed_tuple)
  else
    self
  end
end