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Contents
require 'set'
module MARC
# MARC records contain control fields, each of which has a
# tag and value. Tags for control fields must be in the
# 001-009 range or be specially added to the @@control_tags Set
class ControlField
# Initially, control tags are the numbers 1 through 9 or the string '000'
@@control_tags = Set.new(%w{000 001 002 003 004 005 006 007 008 009})
def self.control_tags
return @@control_tags
end
# A tag is a control tag if tag.to_s is a member of the @@control_tags set.
def self.control_tag?(tag)
return @@control_tags.include? tag.to_s
end
# the tag value (007, 008, etc)
attr_accessor :tag
# the value of the control field
attr_accessor :value
# The constructor which must be passed a tag value and
# an optional value for the field.
def initialize(tag,value='')
@tag = tag
@value = value
if not MARC::ControlField.control_tag?(@tag)
raise MARC::Exception.new(), "tag must be in 001-009 or in the MARC::ControlField.control_tags set"
end
end
# Two control fields are equal if their tags and values are equal.
def ==(other)
if @tag != other.tag
return false
elsif @value != other.value
return false
end
return true
end
# turning it into a marc-hash element
def to_marchash
return [@tag, @value]
end
# Turn the control field into a hash for MARC-in-JSON
def to_hash
return {@tag=>@value}
end
def to_s
return "#{tag} #{value}"
end
def =~(regex)
return self.to_s =~ regex
end
end
end
Version data entries
13 entries across 13 versions & 2 rubygems