141 lines
3.7 KiB
Ruby
141 lines
3.7 KiB
Ruby
require 'avm/creator'
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require 'avm/xmp'
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require 'avm/image_type'
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require 'avm/image_quality'
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require 'avm/observation'
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module AVM
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class Image
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DUBLIN_CORE_FIELDS = [ :title, :description ]
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AVM_SINGLE_FIELDS = [ 'Distance.Notes', 'Spectral.Notes', 'ReferenceURL', 'Credit', 'Date', 'ID', 'Type', 'Image.ProductQuality' ]
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AVM_SINGLE_METHODS = [ :distance_notes, :spectral_notes, :reference_url, :credit, :date, :id, :type, :quality ]
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AVM_SINGLES = AVM_SINGLE_FIELDS.zip(AVM_SINGLE_METHODS)
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attr_reader :creator, :observations
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def initialize(options = {})
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@creator = AVM::Creator.new(self)
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@options = options
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@observations = []
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end
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def create_observation(options)
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observation = Observation.new(self, options)
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@observations << observation
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observation
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end
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def to_xml
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document = AVM::XMP.new
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creator.add_to_document(document)
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Observation.add_to_document(document, observations)
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document.get_refs do |refs|
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DUBLIN_CORE_FIELDS.each do |field|
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refs[:dublin_core].add_child(%{<dc:#{field}>#{alt_li_tag(send(field))}</dc:#{field}>})
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end
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refs[:photoshop].add_child(%{<photoshop:Headline>#{headline}</photoshop:Headline>})
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AVM_SINGLE_FIELDS.zip([distance_notes, spectral_notes, reference_url, credit, string_date, id, image_type, image_quality]).each do |tag, value|
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refs[:avm].add_child(%{<avm:#{tag}>#{value.to_s}</avm:#{tag}>}) if value
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end
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distance_nodes = []
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distance_nodes << rdf_li(light_years) if light_years
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if redshift
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distance_nodes << rdf_li('-') if distance_nodes.empty?
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distance_nodes << rdf_li(redshift)
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end
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if !distance_nodes.empty?
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refs[:avm].add_child(%{<avm:Distance><rdf:Seq>#{distance_nodes.join}</rdf:Seq></avm:Distance>})
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end
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end
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document.doc
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end
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def id
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@options[:id]
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end
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def image_type
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(AVM::ImageType.const_get(@options[:type].to_sym).new rescue nil)
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end
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def image_quality
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(AVM::ImageQuality.const_get(@options[:quality].to_sym).new rescue nil)
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end
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def date
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(Time.parse(@options[:date]) rescue nil)
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end
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def string_date
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return nil if !date
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date.strftime('%Y-%m-%d')
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end
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def distance
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[ light_years, redshift ]
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end
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def self.from_xml(string)
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document = AVM::XMP.from_string(string)
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options = {}
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document.get_refs do |refs|
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DUBLIN_CORE_FIELDS.each do |field|
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if node = refs[:dublin_core].at_xpath(".//dc:#{field}//rdf:li[1]")
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options[field] = node.text
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end
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end
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AVM_SINGLES.each do |tag, field|
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if node = refs[:avm].at_xpath("./avm:#{tag}")
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options[field] = node.text
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end
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end
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if node = refs[:photoshop].at_xpath('./photoshop:Headline')
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options[:headline] = node.text
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end
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if node = refs[:avm].at_xpath('./avm:Distance')
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list_values = node.search('.//rdf:li').collect { |li| li.text }
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case list_values.length
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when 1
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options[:light_years] = list_values.first
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when 2
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options[:light_years] = (list_values.first == '-') ? nil : list_values.first
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options[:redshift] = list_values.last
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end
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end
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end
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image = new(options)
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image.creator.from_xml(self, document)
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Observation.from_xml(image, document)
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image
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end
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def method_missing(method)
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@options[method]
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end
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private
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def alt_li_tag(text)
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%{<rdf:Alt><rdf:li xml:lang="x-default">#{text}</rdf:li></rdf:Alt>}
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end
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def rdf_li(text)
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%{<rdf:li>#{text}</rdf:li>}
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end
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end
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end
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