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 219

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')
    if(subtitle)
      title += ' (' + subtitle.content + ')'
     end
   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 67

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?
     new_use =  doc.create_element("accessCondition", use.text.strip, :type => 'useAndReproduction')
     doc.root.element_children.last.add_next_sibling new_use
   end
   rights.xpath('//copyright/human[@type="copyright"]').each do |cr|
     txt = cr.text.strip
     next if txt.empty?
     new_use =  doc.create_element("accessCondition", cr.text.strip, :type => 'copyright')
     doc.root.element_children.last.add_next_sibling new_use
   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}"
     new_lic =  doc.create_element("accessCondition", new_text, :type => 'license')
     doc.root.element_children.last.add_next_sibling new_lic
   end
   rights.xpath("//use/machine[#{ci_compare('type', 'opendata')}]").each do |lic_type|
     next if lic_type.text =~ /none/i
     lic_text = rights.at_xpath("//use/human[#{ci_compare('type', 'opendata')}]").text.strip
     next if lic_text.empty?
     new_text = "ODC #{lic_type.text}: #{lic_text}"
     new_lic =  doc.create_element("accessCondition", new_text, :type => 'license')
     doc.root.element_children.last.add_next_sibling new_lic
   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 105

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 182

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 25

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 191

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 or 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 15

def fetch_descMetadata_datastream
	candidates = self.datastreams['identityMetadata'].otherId.collect { |oid| oid.to_s }
	metadata_id = Dor::MetadataService.resolvable(candidates).first
	unless metadata_id.nil?
		return Dor::MetadataService.fetch(metadata_id.to_s)
	else
		return nil
	end
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 38

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 55

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 150

def metadata_format
	DESC_MD_FORMATS[metadata_namespace]
end

#metadata_namespace ⇒ Object 



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# File 'lib/dor/models/describable.rb', line 141

def metadata_namespace
	desc_md = self.datastreams['descMetadata'].ng_xml
	if desc_md.nil? or desc_md.root.nil? or 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 203

def set_desc_metadata_using_label(force=false)
	ds=self.descMetadata
	unless force or ds.new?#22 is the length of <?xml version="1.0"?>
		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

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



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

def to_solr(solr_doc=Hash.new, *args)
	super solr_doc, *args
	add_solr_value(solr_doc, "metadata_format", self.metadata_format, :string, [:searchable, :facetable])
	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, [: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
	solr_doc
end

#update_title(new_title) ⇒ Object 



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# File 'lib/dor/models/describable.rb', line 177

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