Class: GenericResource

Inherits:
ActiveFedora::Base
  • Object
show all
Extended by:
ActiveModel::Callbacks
Includes:
ActiveFedora::DatastreamCollections, ActiveFedora::FinderMethods::RepositoryMethods, Cul::Hydra::Fedora::UrlHelperBehavior, Cul::Hydra::Models::Common, Cul::Hydra::Models::ImageResource, Cul::Hydra::Models::RelsInt
Defined in:
app/models/generic_resource.rb

Constant Summary collapse

IMAGE_EXT = 
{"image/bmp" => 'bmp', "image/gif" => 'gif', "image/jpeg" => 'jpg', "image/png" => 'png', "image/tiff" => 'tif', "image/x-windows-bmp" => 'bmp'}
WIDTH = 
RDF::URI(ActiveFedora::Predicates.find_graph_predicate(:image_width))
LENGTH = 
RDF::URI(ActiveFedora::Predicates.find_graph_predicate(:image_length))

Constants included from Cul::Hydra::Models::ImageResource

Cul::Hydra::Models::ImageResource::DEGREES_TO_EXIF_ORIENTATIONS, Cul::Hydra::Models::ImageResource::DJATOKA_BASE_URL, Cul::Hydra::Models::ImageResource::DJATOKA_THUMBNAIL_PARMS, Cul::Hydra::Models::ImageResource::EXIF_ORIENTATION_TO_DEGREES, Cul::Hydra::Models::ImageResource::EXTENT_PREDICATE, Cul::Hydra::Models::ImageResource::FORMAT_OF_PREDICATE, Cul::Hydra::Models::ImageResource::FORMAT_URI, Cul::Hydra::Models::ImageResource::LENGTH_PREDICATE, Cul::Hydra::Models::ImageResource::WIDTH_PREDICATE

Instance Method Summary collapse

Methods included from Cul::Hydra::Fedora::UrlHelperBehavior

#fedora_ds_url, #fedora_method_url, #fedora_object_url, #fedora_risearch_url, #fedora_url, #pid_for_url

Methods included from Cul::Hydra::Models::RelsInt

#rels_int

Methods included from Cul::Hydra::Models::ImageResource

#length, #long, #orientation, #orientation=, #required_rotation_for_upright_display, #width

Methods included from Cul::Hydra::Models::Common

#cmodel_pid, #datastreams_in_fedora, #get_representative_generic_resource, #get_singular_rel, #has_desc?, #initialize, #label=, #rdf_type, #rdf_types!, #set_singular_rel, #set_size_labels, #update_datastream_attributes

Instance Method Details

#access_levels ⇒ Object 



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# File 'app/models/generic_resource.rb', line 150

def access_levels
  acm = datastreams['accessControlMetadata']
  return [] if acm.content.blank?
  return acm.to_solr.fetch('access_control_levels_ssim', [])
end

#assert_content_model ⇒ Object 



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# File 'app/models/generic_resource.rb', line 28

def assert_content_model
  super
  add_relationship(:rdf_type, RDF::CUL.Resource.to_s)
end

#closed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/models/generic_resource.rb', line 146

def closed?
  return access_levels.map(&:downcase).include?('closed')
end

#index_type_label ⇒ Object 



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# File 'app/models/generic_resource.rb', line 37

def index_type_label
  "FILE ASSET"
end

#linkable_resources ⇒ Object 



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# File 'app/models/generic_resource.rb', line 98

def linkable_resources
  # let's start with the known DSIDs from lindquist, then work our way back to parsing the solrized relsint
  results = []
  if (rels = rels_int.instance_variable_get :@solr_hash)
    # this was loaded from solr
    rels.each do |dsuri, props|
      if dsuri =~ /\/content$/ or not props[FORMAT_OF_PREDICATE].blank?
        dsid =  dsuri.split('/')[-1]
        res = datastream_as_resource(dsid, props.with_indifferent_access)
        results << res
      end
    end
  else
    content_uri = RDF::URI("info:fedora/#{self.pid}/content")
    dsuris = [content_uri]
    results = []
    # read the graph
    datastreams.each do |k, v|
      rels = rels_int.relationships(v, :format_of, content_uri)
      dsuris << rels[0].subject unless rels.blank?
    end

    dsuris.each do |dsuri|
      dsid = dsuri.to_s.split('/')[-1]
      width_rel = rels_int.relationships(dsuri, :image_width)[0]
      length_rel = rels_int.relationships(dsuri, :image_length)[0]
      extent_rel = rels_int.relationships(dsuri, :extent)[0]
      props = {extent: [], image_width: [], image_length: []}
      props[:extent] << extent_rel.object.to_s unless extent_rel.blank?
      props[:image_width] << width_rel.object.to_s unless width_rel.blank?
      props[:image_length] << length_rel.object.to_s unless length_rel.blank?
      results << datastream_as_resource(dsid, props)
    end
  end
  results
end

#route_as ⇒ Object 



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# File 'app/models/generic_resource.rb', line 33

def route_as
  "resource"
end

#service_datastream ⇒ Object 



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# File 'app/models/generic_resource.rb', line 156

def service_datastream
  # we have to 'manually' query the graph because rels_int doesn't support subject pattern matching
  args = [:s, rels_int.to_predicate(:format_of), RDF::URI.new("#{internal_uri}/content")]
  query = RDF::Query.new { |q| q << args }
  candidates = query.execute(rels_int.graph).map(&:to_hash).map do |hash|
    hash[:s]
  end
  args = [:s, rels_int.to_predicate(:rdf_type), RDF::URI.new("http://pcdm.org/use#ServiceFile")]
  query = RDF::Query.new { |q| q << args }
  candidates &= query.execute(rels_int.graph).map(&:to_hash).map do |hash|
    hash[:s]
  end
  candidate_dsid = candidates.first && candidates.first.to_s.split('/')[-1]
  return datastreams[candidate_dsid] if datastreams.keys.include? candidate_dsid
  return nil
end

#thumbnail_info ⇒ Object 



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# File 'app/models/generic_resource.rb', line 82

def thumbnail_info
  thumb = rels_int.relationships(datastreams['content'],:foaf_thumbnail).first
  if thumb
    t_dsid = thumb.object.to_s.split('/')[-1]
    t_url = "#{ActiveFedora.fedora_config.credentials[:url]}/objects/#{pid}/datastreams/#{t_dsid}/content"
    return {:url=>t_url,:mime=>datastreams[t_dsid].mimeType}
  elsif self.zooming?
    t_dsid = rels_int.relationships(dsuri, :foaf_zooming).first.object.to_s.split('/')[-1]
    t_parms = DJATOKA_THUMBNAIL_PARMS.merge({"rft_id" => datastreams[t_dsid].dsLocation})
    url = "#{DJATOKA_BASE_URL}?#{options.map { |key, value|  "#{CGI::escape(key.to_s)}=#{CGI::escape(value.to_s)}"}.join("&")  }"
    {:url => url, :mime => t_parms["svc.format"]}
  else
    return {:asset => "cul_hydra/crystal/file.png",:mime=>'image/png'}
  end
end

#to_solr(solr_doc = Hash.new, opts = {}) ⇒ Object 



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# File 'app/models/generic_resource.rb', line 41

def to_solr(solr_doc = Hash.new, opts={})
  solr_doc = super

  unless solr_doc["extent_ssim"] || self.datastreams["content"].nil?
    if self.datastreams["content"].dsSize.to_i > 0
      solr_doc["extent_ssim"] = [self.datastreams["content"].dsSize]
    else
      repo = ActiveFedora::Base.connection_for_pid(pid)
      ds_parms = {pid: pid, dsid: "content", method: :head}
      repo.datastream_dissemination(ds_parms) do |res|
        solr_doc["extent_ssim"] = res['Content-Length']
      end
    end
  end

  if self.zooming?
    fz = rels_int.relationships(datastreams['content'], :foaf_zooming).first.object.to_s.split('/')[-1]
    ds = datastreams[fz]
    unless ds.nil?
      rft_id = ds.controlGroup == 'E' ? datastreams[fz].dsLocation : legacy_content_path(ds,'info:fedora/datastreams/')
      solr_doc['rft_id_ss'] = rft_id
    end
  end

  if (service_ds = self.service_datastream)
    solr_doc['service_dslocation_ss'] = service_ds.dsLocation
  end
  solr_doc["fulltext_tesim"] = []
  unless self.datastreams["fulltext"].nil?
    solr_doc["fulltext_tesim"].concat(solr_doc["title_display_ssm"]) unless solr_doc["title_display_ssm"].nil? or solr_doc["title_display_ssm"].length == 0
    solr_doc["fulltext_tesim"] << self.datastreams["fulltext"].content
  end
  relationships(:original_name).each do |original_name|
    solr_doc["original_name_tesim"] ||= []
    original_name = original_name.object.to_s.split('/').join(' ')
    solr_doc["original_name_tesim"] << original_name.strip
  end

  solr_doc
end

#with_ds_resource(ds_id, fedora_content_filesystem_mounted = false, &block) ⇒ Object 



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# File 'app/models/generic_resource.rb', line 173

def with_ds_resource(ds_id, fedora_content_filesystem_mounted=false, &block)
  ds = self.datastreams[ds_id]

  # If the dsLocation starts with the pid, that means that we're dealing with an internally-managed ds,
  # so we can't reference the file directly even if we do have the fedora content filesystem mounted.
  if ! ds.dsLocation.start_with?(self.pid) && fedora_content_filesystem_mounted
    if ds.dsLocation =~ /^file:\//
      dsLocation = ds.dsLocation.sub(/^file:\/+/,'/')
      path = URI.unescape(dsLocation)
    else
      path = ds.dsLocation
    end

    yield(path)
  else
    internal_uri = "info:fedora/#{self.pid}/#{ds_id}"
    # No local fedora mount, need to download content over http[s]

    file_basename = File.basename(ds.dsLocation.gsub(/^file:/,''))
    file_extension = File.extname(file_basename)

    # In some cases, we actually do want to know the original extension of the file, so we'll preserve it in the temp file filename
    temp_file = Tempfile.new([file_basename, file_extension])
    begin
      parts = internal_uri.split('/')
      open(temp_file.path, 'wb') do |blob|
        repo = ActiveFedora::Base.connection_for_pid(parts[1])
        repo.datastream_dissemination({:dsid=>parts[2], :pid=>parts[1], :finished=>false}) do |res|
          res.read_body do |seg|
            blob << seg
          end
        end
      end
      yield(temp_file.path)
    ensure
      temp_file.unlink
    end
  end

end

#zooming? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/models/generic_resource.rb', line 135

def zooming?
  content = datastreams['content']
  return false unless content
  zr = rels_int.relationships(content, :foaf_zooming)
  if (zr && zr.first)
    return !zr.first.blank?
  else
    false
  end
end