Class: ActiveFedora::QualifiedDublinCoreDatastream

Inherits:
MetadataDatastream show all
Defined in:
lib/active_fedora/qualified_dublin_core_datastream.rb

Overview

This class represents a Qualified Dublin Core Datastream. A special case of ActiveFedora::MetdataDatastream The implementation of this class defines the terms from the Qualified Dublin Core specification. This implementation features customized xml generators and deserialization routines to handle the Fedora Dublin Core XML datastreams structure.

Fields can still be overridden if more specificity is desired (see ActiveFedora::Datastream#fields method).

Constant Summary collapse

DCTERMS =

A frozen array of Dublincore Terms.

[
  :contributor, :coverage, :creator,  :description, :format, :identifier, :language, :publisher, :relation,  :source, :title, :abstract, :accessRights, :accrualMethod, :accrualPeriodicity, :accrualPolicy, :alternative, :audience, :available, :bibliographicCitation, :conformsTo, :contributor, :coverage, :created, :creator, :date, :dateAccepted, :dateCopyrighted, :dateSubmitted, :description, :educationLevel, :extent, :format, :hasFormat, :hasPart, :hasVersion, :identifier, :instructionalMethod, :isFormatOf, :isPartOf, :isReferencedBy, :isReplacedBy, :isRequiredBy, :issued, :isVersionOf, :language, :license, :mediator, :medium, :modified, :provenance, :publisher, :references, :relation, :replaces, :requires, :rights, :rightsHolder, :source, :spatial, :subject, :tableOfContents, :temporal, :type, :valid
]

Instance Attribute Summary

Attributes included from MetadataDatastreamHelper

#fields

Attributes inherited from Datastream

#dirty, #fields, #last_modified

Attributes inherited from Fedora::BaseObject

#attributes, #blob, #errors, #new_object, #uri

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from MetadataDatastream

#field, #get_values, #set_value, #update_attributes, #update_indexed_attributes

Methods included from MetadataDatastreamHelper

#from_solr, included, #save, #to_solr, #to_xml

Methods inherited from Datastream

#after_save, #before_save, #check_concurrency, #content, #content=, #delete, delete, #dirty?, #dsid=, #last_modified_in_repository, #pid, #pid=, #save, #size, #to_param

Methods inherited from Fedora::Datastream

#control_group, #control_group=, #dsid, #label, #label=, #mime_type, #mime_type=, #pid, #uri, #url

Methods inherited from Fedora::BaseObject

#[], #new_object?

Constructor Details

#initialize(attrs = nil) ⇒ QualifiedDublinCoreDatastream

Constructor. this class will call self.field for each DCTERM. In short, all DCTERMS fields will already exist when this method returns. Each term is marked as a multivalue string.



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# File 'lib/active_fedora/qualified_dublin_core_datastream.rb', line 18

def initialize(attrs=nil)
  super
  DCTERMS.each do |el|
    field el, :string, :multiple=>true
  end
  self
end

Class Method Details

.from_xml(tmpl, node) ⇒ Object

Populate a QualifiedDublinCoreDatastream object based on the “datastream” node from a FOXML file

Parameters:

  • tmpl (ActiveFedora::Datastream) —

    the Datastream object that you are building

  • node (Nokogiri::XML::Node) —

    the “foxml:datastream” node from a FOXML file. Assumes that the content of this datastream is that of an ActiveFedora QualifiedDublinCoreDatastream



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# File 'lib/active_fedora/qualified_dublin_core_datastream.rb', line 33

def self.from_xml(tmpl, node) # :nodoc:
 tmpl.fields.each do |z|
   fname = z.first
   fspec = z.last
   node_name = "dcterms:#{fspec[:xml_node] ? fspec[:xml_node] : fname}"
   attr_modifier= "[@xsi:type='#{fspec[:encoding]}']" if fspec[:encoding]
   query = "./foxml:datastreamVersion[last()]/foxml:xmlContent/dc/#{node_name}#{attr_modifier}"
   node.xpath(query, {"foxml"=>"info:fedora/fedora-system:def/foxml#", "dcterms"=>'http://purl.org/dc/terms/', "xsi"=>'http://www.w3.org/2001/XMLSchema-instance'}).each do |f|
      tmpl.send("#{fname}_append", f.text)
    end

 end
 tmpl.instance_variable_set(:@dirty, false)
 tmpl
end

Instance Method Details

#set_blob_for_save ⇒ Object

:nodoc:



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# File 'lib/active_fedora/qualified_dublin_core_datastream.rb', line 26

def set_blob_for_save # :nodoc:
  self.blob = self.to_dc_xml
end

#to_dc_xml ⇒ Object

Render self as a Fedora DC xml document.



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# File 'lib/active_fedora/qualified_dublin_core_datastream.rb', line 50

def to_dc_xml
  #TODO: pull the modifiers up into MDDS
  xml = REXML::Document.new("<dc xmlns:dcterms='http://purl.org/dc/terms/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'/>")
  fields.each do |field_name,field_info|
    el = REXML::Element.new("dcterms:#{field_name.to_s}")
    if field_info.class == Hash
      field_info.each do |k, v|
        case k
        when :element_attrs
         v.each{|k,v| el.add_attribute(k.to_s, v.to_s)}
        when :values, :type
          # do nothing to the :values array
        when :xml_node
          el.name = "dcterms:#{v}"
        when :encoding, :encoding_scheme
          el.add_attribute("xsi:type", v)
        when :multiple
          next
        else
          el.add_attribute(k.to_s, v)
        end
      end
      field_info = field_info[:values]
    end
    field_info.each do |val|
      el = el.clone
      el.text = val.to_s
      xml.root.elements.add(el)
    end
  end
  return xml.to_s
end