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module SPARQL; module Algebra
class Operator
##
# The SPARQL logical `floor` operator.
#
# @example
# (floor ?x)
#
# @see http://www.w3.org/TR/sparql11-query/#func-floor
# @see http://www.w3.org/TR/xpath-functions/#func-floor
class Floor < Operator::Unary
include Evaluatable
NAME = [:floor]
##
# Returns the largest (closest to positive infinity) number with no fractional part that is not greater than the value of `arg`. An error is raised if `arg` is not a numeric value.
#
# If type of $arg is one of the four numeric types xs:float, xs:double, xs:decimal or xs:integer the type of the result is the same as the type of $arg. If the type of $arg is a type derived from one of the numeric types, the result is an instance of the base numeric type.
#
# For float and double arguments, if the argument is positive zero, then positive zero is returned. If the argument is negative zero, then negative zero is returned.
#
# @param [RDF::Literal] operand
# the operand
# @return [RDF::Literal] literal of same type
# @raise [TypeError] if the operand is not a numeric value
def apply(operand)
case operand
when RDF::Literal::Numeric then operand.floor
else raise TypeError, "expected an RDF::Literal::Numeric, but got #{operand.inspect}"
end
end
end # Floor
end # Operator
end; end # SPARQL::Algebra
Version data entries
11 entries across 11 versions & 1 rubygems