class FDB::Subspace

def [](name)
  Subspace.new([name], @raw_prefix)
end

def as_foundationdb_key
  key
end

def contains?(key)
  key.start_with? @raw_prefix
end

def initialize(prefix_tuple=[], raw_prefix='')
  @raw_prefix = raw_prefix.dup.force_encoding('BINARY') + FDB::Tuple.pack(prefix_tuple)
end

def key
  @raw_prefix
end

def pack(tuple)
  @raw_prefix + FDB::Tuple.pack(tuple)
end

def range(tuple=[])
  rng = FDB::Tuple.range(tuple)
  [@raw_prefix + rng[0], @raw_prefix + rng[1]]
end

def subspace(tuple)
  Subspace.new(tuple, @raw_prefix)
end

def unpack(key)
  raise ArgumentError, 'Cannot unpack key that is not in subspace.' if not contains? key
  FDB::Tuple.unpack(key[@raw_prefix.length..-1])
end