On Dec 27, 2005, at 12:39 PM, Bruce D'Arcus wrote:
Hi All (and happy holidays),
I've been playing again with Ruby, trying to think through some
details, and also seeing if I can do anything useful with Rails.
Anyway, it occurs to me that it's rather easier for me to think in
terms of oo or rdf classes and such, than in terms of SQL schemas
or XML trees.
So here's the start of how I'm thinking. It might be a useful
framework on which -- among other things -- to port citeproc to C+
+, to think about GUI details, etc.
Right now it's quite spare (particularly the attributes), but I
think the basic approach is right, and is a nice balance of
simplicity and flexiblity/expressiveness.
# -- Reference class and subclasses
# the base class
class Reference
attr_reader :title, :creator, :year, :type
def initialize(title, creator, year, type)
@title = title
# not sure how to do this right, but creator ought to be an
array of agent objects
@creator = []
Thinking in rails terms (or rather ActiveRecord terms), how about this:
has_many :creators
where Creator < Agent;
@year = year
@type = type
end
end
# standalone items like books, reports, or albums
class Monograph < Reference
def initialize(title, creator, year, type, publisher, partOf=nil)
super(title, creaor, year, type)
@publisher = publisher
# partOf is an item-collection relation
@partOf = partOf
end
end
# book chapters, parts of reports, etc.
class PartInMonograph < Reference
def initialize(title, creator, year, type, containedIn, pages)
super(title, creaor, year, type)
# containIn is a part-reference relation
@containedIn = containedIn
@pages = pages
end
end
# articles, bills, etc.; items published in serials/periodicals
class PartInSerial < Reference
def initialize(title, creator, year, type, partOf, pages, volume,
issue)
super(title, creaor, year, type)
@partOf = partOf
@pages = pages
@volume = volume
@issue = issue
end
end
# non-citable resources such as periodicals, series, or
# archival collections
class Collection
def initialize(title)
@title = title
end
end
class Periodical < Collection
def initialize(title)
super(title)
end
end
class Series < Collection
def initialize(title)
super(title)
end
end
# -- Agents
class Agent
attr_reader :name, :sortname
def initialize(name, sortname)
@name = name
@sortname = sortname
end
end
class Person < Agent
def initialize(name, sortname)
super(name, sortname)
end
end
class Organization < Agent
def initialize(name, sortname=nil)
super(name, sortname)
end
end
class Publisher < Organization
def initialize(name, place)
super(name)
@place = place
end
end
class Event
def initialize(name, date, sponsor)
@name = name
@date = date
@sponsor = sponsor
end
end
class Conference < Event
def initialize(name, date, sponsor)
super(name, date, sponsor)
end
end
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