Sha256: 3c1bc91f4ab091610bfe07c6569d7c164601c4a60b00b55173b5d6948657a4fb
Contents?: true
Size: 1.19 KB
Versions: 17
Compression:
Stored size: 1.19 KB
Contents
require 'digest'
module SPARQL; module Algebra
class Operator
##
# The SPARQL logical `md5` operator.
#
# @example
# (prefix ((: <http://example.org/>))
# (project (?hash)
# (extend ((?hash (md5 ?l)))
# (bgp (triple :s1 :str ?l)))))
#
# @see http://www.w3.org/TR/sparql11-query/#func-md5
class MD5 < Operator::Unary
include Evaluatable
NAME = :md5
##
# Returns the MD5 checksum, as a hex digit string, calculated on the UTF-8 representation of the simple literal or lexical form of the xsd:string. Hex digits should be in lower case.
#
# @param [RDF::Literal] operand
# the operand
# @return [RDF::Literal]
# @raise [TypeError] if the operand is not a simple literal
def apply(operand)
raise TypeError, "expected an RDF::Literal, but got #{operand.inspect}" unless operand.literal?
raise TypeError, "expected simple literal or xsd:string, but got #{operand.inspect}" unless (operand.datatype || RDF::XSD.string) == RDF::XSD.string
RDF::Literal(Digest::MD5.new.hexdigest(operand.to_s))
end
end # MD5
end # Operator
end; end # SPARQL::Algebra
Version data entries
17 entries across 17 versions & 1 rubygems