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Contents
require 'marcspec/controlfieldspec'
module MARCSpec
# A LeaderSpec deals only with the leader. It's basically the same as a controlfield spec, but
# using the string 'LDR' to identify itself
class LeaderSpec < ControlFieldSpec
# Built to be syntax-compatible with ControlFieldSpec, the tag must always
# be 'LDR' (case matters)
#
# @param ['LDR'] tag The 'tag'; in this case, always 'LDR'
# @param [Fixnum, Range<Fixnum>] range substring specification (either one character or a range) to return
# instead of the whole leader.
def initialize (tag, range=nil)
unless tag == 'LDR'
raise ArgumentError, "Tag must be 'LDR' for a LeaderSpec"
end
@tag = 'LDR'
self.range = range
end
# Return the appropriate value (either the leader or a subset of it) from the
# given record
#
# @param [MARC4J4R::Record] r A MARC4J4R Record
# @return [String] the leader or substring of the leader
def marc_values r
if @range
return r.leader[@range]
else
return r.leader
end
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems