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Contents
module RDF
##
# An RDF term.
#
# Terms can be used as subjects, predicates, objects, and contexts of
# statements.
#
# @since 0.3.0
module Term
include RDF::Value
include Comparable
##
# Compares `self` to `other` for sorting purposes.
#
# Subclasses should override this to provide a more meaningful
# implementation than the default which simply performs a string
# comparison based on `#to_s`.
#
# @abstract
# @param [Object] other
# @return [Integer] `-1`, `0`, or `1`
def <=>(other)
self.to_s <=> other.to_s
end
##
# Compares `self` to `other` to implement RDFterm-equal.
#
# Subclasses should override this to provide a more meaningful
# implementation than the default which simply performs a string
# comparison based on `#to_s`.
#
# @abstract
# @param [Object] other
# @return [Integer] `-1`, `0`, or `1`
#
# @see http://www.w3.org/TR/rdf-sparql-query/#func-RDFterm-equal
def ==(other)
super
end
##
# Determins if `self` is the same term as `other`.
#
# Subclasses should override this to provide a more meaningful
# implementation than the default which simply performs a string
# comparison based on `#to_s`.
#
# @abstract
# @param [Object] other
# @return [Integer] `-1`, `0`, or `1`
#
# @see http://www.w3.org/TR/rdf-sparql-query/#func-sameTerm
def eql?(other)
super
end
##
# Returns `true` if this term is constant.
#
# @return [Boolean] `true` or `false`
# @see #variable?
def constant?
!(variable?)
end
##
# Returns `true` if this term is variable.
#
# @return [Boolean] `true` or `false`
# @see #constant?
def variable?
false
end
end # Term
end # RDF
Version data entries
17 entries across 17 versions & 2 rubygems