Module: Dor::Describable

Extended by:
ActiveSupport::Concern
Included in:
AdminPolicyObject, BasicItem, Collection, Publishable, Set
Defined in:
lib/dor/models/describable.rb

Defined Under Namespace

Classes: CrosswalkError

Constant Summary collapse

DESC_MD_FORMATS = 
{
  "http://www.tei-c.org/ns/1.0" => 'tei',
  "http://www.loc.gov/mods/v3"  => 'mods'
}

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.get_collection_title(obj) ⇒ Object 



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# File 'lib/dor/models/describable.rb', line 250

def self.get_collection_title(obj)
  xml=obj.descMetadata.ng_xml
  title=''
  title_node = xml.at_xpath('//mods:mods/mods:titleInfo/mods:title','mods' => 'http://www.loc.gov/mods/v3')
  if(title_node)
    title = title_node.content
    subtitle=xml.at_xpath('//mods:mods/mods:titleInfo/mods:subTitle','mods' => 'http://www.loc.gov/mods/v3')
    title += " (#{subtitle.content})" if subtitle
  end
  title
end

Instance Method Details

#add_access_conditions(doc) ⇒ Object

Note:

this method modifies the passed in doc

Create MODS accessCondition statements from rightsMetadata

Parameters:



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# File 'lib/dor/models/describable.rb', line 75

def add_access_conditions(doc)
  # clear out any existing accessConditions
  doc.xpath('//mods:accessCondition', 'mods' => 'http://www.loc.gov/mods/v3').each {|n| n.remove}
  rights = self.datastreams['rightsMetadata'].ng_xml

  rights.xpath('//use/human[@type="useAndReproduction"]').each do |use|
    txt = use.text.strip
    next if txt.empty?
    doc.root.element_children.last.add_next_sibling doc.create_element("accessCondition", txt, :type => 'useAndReproduction')
  end
  rights.xpath('//copyright/human[@type="copyright"]').each do |cr|
    txt = cr.text.strip
    next if txt.empty?
    doc.root.element_children.last.add_next_sibling doc.create_element("accessCondition", txt, :type => 'copyright')
  end
  rights.xpath("//use/machine[#{ci_compare('type', 'creativecommons')}]").each do |lic_type|
    next if lic_type.text =~ /none/i
    lic_text = rights.at_xpath("//use/human[#{ci_compare('type', 'creativecommons')}]").text.strip
    next if lic_text.empty?
    new_text = "CC #{lic_type.text}: #{lic_text}"
    doc.root.element_children.last.add_next_sibling doc.create_element("accessCondition", new_text, :type => 'license')
  end
  rights.xpath("//use/machine[#{ci_compare('type', 'opendatacommons')}]").each do |lic_type|
    next if lic_type.text =~ /none/i
    lic_text = rights.at_xpath("//use/human[#{ci_compare('type', 'opendatacommons')}]").text.strip
    next if lic_text.empty?
    new_text = "ODC #{lic_type.text}: #{lic_text}"
    doc.root.element_children.last.add_next_sibling doc.create_element("accessCondition", new_text, :type => 'license')
  end
end

#add_collection_reference(doc) ⇒ Object

Note:

this method modifies the passed in doc

returns the desc metadata a relatedItem with information about the collection this object belongs to for use in published mods and mods to DC conversion

Parameters:



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# File 'lib/dor/models/describable.rb', line 109

def add_collection_reference(doc)
  return unless self.methods.include? :public_relationships
  collections=self.public_relationships.search('//rdf:RDF/rdf:Description/fedora:isMemberOfCollection',
                                   'fedora' => 'info:fedora/fedora-system:def/relations-external#',
                                   'rdf' => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#' )
  return if collections.empty?

  # Remove any existing collections in the descMetadata
  doc.search('/mods:mods/mods:relatedItem[@type="host"]/mods:typeOfResource[@collection=\'yes\']', 'mods' => 'http://www.loc.gov/mods/v3').each do |node|
    node.parent.remove
  end

  collections.each do |collection_node|
    druid=collection_node['rdf:resource']
    druid=druid.gsub('info:fedora/','')
    collection_obj=Dor::Item.find(druid)
    collection_title = Dor::Describable.get_collection_title(collection_obj)
    related_item_node=Nokogiri::XML::Node.new('relatedItem',doc)
    related_item_node['type']='host'
    title_info_node=Nokogiri::XML::Node.new('titleInfo',doc)
    title_node=Nokogiri::XML::Node.new('title',doc)
    title_node.content=collection_title

    id_node=Nokogiri::XML::Node.new('identifier',doc)
    id_node['type'] = 'uri'
    id_node.content = "http://#{Dor::Config.stacks.document_cache_host}/#{druid.split(':').last}"

    type_node=Nokogiri::XML::Node.new('typeOfResource',doc)
    type_node['collection'] = 'yes'
    doc.root.add_child(related_item_node)
    related_item_node.add_child(title_info_node)
    title_info_node.add_child(title_node)
    related_item_node.add_child(id_node)
    related_item_node.add_child(type_node)
  end
end

#add_identifier(type, value) ⇒ Object 



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# File 'lib/dor/models/describable.rb', line 214

def add_identifier(type, value)
  ds_xml=self.descMetadata.ng_xml
  ds_xml.search('//mods:mods','mods' => 'http://www.loc.gov/mods/v3').each do |node|
    new_node=Nokogiri::XML::Node.new('identifier',ds_xml) #this ends up being mods:identifier without having to specify the namespace
    new_node['type']=type
    new_node.content=value
    node.add_child(new_node)
  end
end

#build_descMetadata_datastream(ds) ⇒ Object 



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# File 'lib/dor/models/describable.rb', line 33

def build_descMetadata_datastream(ds)
  content = fetch_descMetadata_datastream
  unless content.nil?
    ds.dsLabel = 'Descriptive Metadata'
    ds.ng_xml = Nokogiri::XML(content)
    ds.ng_xml.normalize_text!
    ds.content = ds.ng_xml.to_xml
  end
end

#delete_identifier(type, value = nil) ⇒ Object 



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# File 'lib/dor/models/describable.rb', line 223

def delete_identifier(type,value=nil)
  ds_xml=self.descMetadata.ng_xml
  ds_xml.search('//mods:identifier','mods' => 'http://www.loc.gov/mods/v3').each do |node|
    if node.content == value || value.nil?
      node.remove
      return true
    end
  end
  return false
end

#fetch_descMetadata_datastream ⇒ Object 



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# File 'lib/dor/models/describable.rb', line 27

def fetch_descMetadata_datastream
  candidates = self.datastreams['identityMetadata'].otherId.collect { |oid| oid.to_s }
  metadata_id = Dor::MetadataService.resolvable(candidates).first
  return metadata_id.nil? ? nil : Dor::MetadataService.fetch(metadata_id.to_s)
end

#generate_dublin_core ⇒ Object

Generates Dublin Core from the MODS in the descMetadata datastream using the LoC mods2dc stylesheet

Should not be used for the Fedora DC datastream

Raises:

  • (Exception) —

    Raises an Exception if the generated DC is empty or has no children



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# File 'lib/dor/models/describable.rb', line 46

def generate_dublin_core
  format = self.metadata_format
  if format.nil?
    raise CrosswalkError, "Unknown descMetadata namespace: #{metadata_namespace.inspect}"
  end
  xslt = Nokogiri::XSLT(File.new(File.expand_path(File.dirname(__FILE__) + "/#{format}2dc.xslt")) )
  desc_md = self.descMetadata.ng_xml.dup(1)
  self.add_collection_reference(desc_md)
  dc_doc = xslt.transform(desc_md)
  # Remove empty nodes
  dc_doc.xpath('/oai_dc:dc/*[count(text()) = 0]').remove
  if(dc_doc.root.nil? || dc_doc.root.children.size == 0)
    raise CrosswalkError, "Dor::Item#generate_dublin_core produced incorrect xml:\n#{dc_doc.to_xml}"
  end
  dc_doc
end

#generate_public_desc_md ⇒ Object 



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# File 'lib/dor/models/describable.rb', line 63

def generate_public_desc_md
  doc = self.descMetadata.ng_xml.dup(1)
  add_collection_reference(doc)
  add_access_conditions(doc)
  new_doc = Nokogiri::XML(doc.to_xml) { |x| x.noblanks }
  new_doc.encoding = 'UTF-8'
  new_doc.to_xml
end

#metadata_format ⇒ Object 



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# File 'lib/dor/models/describable.rb', line 154

def metadata_format
  DESC_MD_FORMATS[metadata_namespace]
end

#metadata_namespace ⇒ Object 



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# File 'lib/dor/models/describable.rb', line 145

def metadata_namespace
  desc_md = self.datastreams['descMetadata'].ng_xml
  if desc_md.nil? || desc_md.root.nil? || desc_md.root.namespace.nil?
    return nil
  else
    return desc_md.root.namespace.href
  end
end

#set_desc_metadata_using_label(force = false) ⇒ Object 



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# File 'lib/dor/models/describable.rb', line 234

def set_desc_metadata_using_label(force=false)
  ds=self.descMetadata
  unless force || ds.new?
    raise 'Cannot proceed, there is already content in the descriptive metadata datastream: '+ds.content.to_s
  end
  label=self.label
  builder = Nokogiri::XML::Builder.new { |xml|
    xml.mods( 'xmlns' => 'http://www.loc.gov/mods/v3', 'xmlns:xsi' => 'http://www.w3.org/2001/XMLSchema-instance',:version => '3.3', "xsi:schemaLocation" => 'http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-3.xsd'){
      xml.titleInfo{
        xml.title label
      }
    }
  }
  self.descMetadata.content=builder.to_xml
end

#stanford_mods(content = nil, ns_aware = true) ⇒ Object

intended for read-access, “as SearchWorks would see it”, mostly for to_solr()

Parameters:

  • content (Nokogiri::XML::Document) (defaults to: nil) —

    Nokogiri descMetadata document (overriding internal data)

  • ns_aware (boolean) (defaults to: true) —

    namespace awareness toggle for from_nk_node()



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# File 'lib/dor/models/describable.rb', line 20

def stanford_mods(content=nil, ns_aware=true)
  m = Stanford::Mods::Record.new
  desc = content.nil? ? self.descMetadata.ng_xml : content
  m.from_nk_node(desc.root, ns_aware)
  m
end

#to_solr(solr_doc = Hash.new, *args) ⇒ Object 



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# File 'lib/dor/models/describable.rb', line 158

def to_solr(solr_doc=Hash.new, *args)
  super solr_doc, *args
  mods_sources = {
    'sw_language_tesim'           => :sw_language_facet,
    'sw_genre_tesim'              => :sw_genre,
    'sw_format_tesim'             => :format_main,   # basically sw_typeOfResource_tesim
    'sw_subject_temporal_tesim'   => :era_facet,
    'sw_subject_geographic_tesim' => :geographic_facet,
    'mods_typeOfResource_tesim'   => [:term_values, :typeOfResource]
  }
  keys = mods_sources.keys.concat(%w[ metadata_format_ssim ])
  keys.each { |key|
    solr_doc[key] ||= []     # initialize multivalue targts if necessary
  }

  solr_doc["metadata_format_ssim"] << self.metadata_format
  begin
    dc_doc = self.generate_dublin_core
    dc_doc.xpath('/oai_dc:dc/*').each do |node|
      add_solr_value(solr_doc, "public_dc_#{node.name}", node.text, :string, [:stored_searchable])
    end
    creator=''
    dc_doc.xpath('//dc:creator').each do |node|
      creator=node.text
    end
    title=''
    dc_doc.xpath('//dc:title').each do |node|
      title=node.text
    end
    creator_title=creator+title
    add_solr_value(solr_doc, 'creator_title', creator_title , :string, [:sortable])
  rescue CrosswalkError => e
    ActiveFedora.logger.warn "Cannot index #{self.pid}.descMetadata: #{e.message}"
  end

  begin
    mods = self.stanford_mods
    mods_sources.each_pair do |solr_key, meth|
      vals = meth.is_a?(Array) ? mods.send(meth.shift, *meth) : mods.send(meth)
      solr_doc[solr_key].push *vals unless (vals.nil? || vals.empty?)
      # asterisk to avoid multi-dimensional array: push values, not the array
    end
    solr_doc['sw_pub_date_sort_ssi'] = mods.pub_date_sort
  end
  # some fields get explicit "(none)" placeholder values, mostly for faceting
  %w[sw_language_tesim sw_genre_tesim sw_format_tesim].each { |key| solr_doc[key] = ['(none)'] if solr_doc[key].empty? }
  # otherwise remove empties
  keys.each{ |key| solr_doc.delete(key) if (solr_doc[key].nil? || solr_doc[key].empty?)}
  solr_doc
end

#update_title(new_title) ⇒ Object 



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# File 'lib/dor/models/describable.rb', line 209

def update_title(new_title)
  if not update_simple_field('mods:mods/mods:titleInfo/mods:title',new_title)
    raise 'Descriptive metadata has no title to update!'
  end
end