Class: Ezid::MetadataTransformDatacite

Inherits:
Object
  • Object
show all
Defined in:
lib/ezid/metadata_transforms/datacite.rb

Class Method Summary collapse

Class Method Details

.inverse(hsh) ⇒ Object

Transforms the provided datacite metadata hash into the format appropriate for the Metadata class. Extracts appropriate fields from the datacite xml and creates the corresponding “datacite.*” keys



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# File 'lib/ezid/metadata_transforms/datacite.rb', line 57

def self.inverse(hsh)
  xml = Nokogiri::XML(hsh["datacite"])
  xmlns = "http://datacite.org/schema/kernel-4"
  hsh["datacite.identifier"] = xml.at_xpath("/ns:resource/ns:identifier/text()", ns: xmlns).to_s
  hsh["datacite.identifiertype"] = xml.at_xpath("/ns:resource/ns:identifier/attribute::identifierType", ns: xmlns).to_s
  hsh["datacite.creator"] = xml.at_xpath("/ns:resource/ns:creators/ns:creator/ns:creatorName/text()", ns: xmlns).to_s
  hsh["datacite.title"] = xml.at_xpath("/ns:resource/ns:titles/ns:title/text()", ns: xmlns).to_s
  hsh["datacite.publisher"] = xml.at_xpath("/ns:resource/ns:publisher/text()", ns: xmlns).to_s
  hsh["datacite.publicationyear"] = xml.at_xpath("/ns:resource/ns:publicationYear/text()", ns: xmlns).to_s
  hsh["datacite.resourcetype"] = xml.at_xpath("/ns:resource/ns:resourceType/text()", ns: xmlns).to_s
  hsh["datacite.resourcetypegeneral"] = xml.at_xpath("/ns:resource/ns:resourceType/attribute::resourceTypeGeneral", ns: xmlns).to_s
  hsh["datacite.description"] = xml.at_xpath("/ns:resource/ns:descriptions/ns:description/text()", ns: xmlns).to_s
  hsh.delete("datacite")
end

.transform(hsh) ⇒ Object

Transforms the provided metadata hash into the appropriate format for datacite. Removes all “datacite.*” keys and transforms these to the appropriate datacite xml. The resultant xml is then added to a single “datacite” key.



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# File 'lib/ezid/metadata_transforms/datacite.rb', line 8

def self.transform(hsh)
  # Render the datacite xml
  resource_opts = {
    "xmlns:xsi" => "http://www.w3.org/2001/XMLSchema-instance",
    "xmlns" => "http://datacite.org/schema/kernel-4",
    "xsi:schemaLocation" => "http://datacite.org/schema/kernel-4 http://schema.datacite.org/meta/kernel-4/metadata.xsd"
  }
  xml_builder = Nokogiri::XML::Builder.new(encoding: "UTF-8") { |builder|
    builder.resource(resource_opts) {
      builder.identifier(identifierType: hsh["datacite.identifiertype"] || "DOI") {
        builder.text hsh["datacite.identifier"]
      }
      builder.creators {
        builder.creator {
          builder.creatorName hsh["datacite.creator"]
        }
      }
      builder.titles {
        builder.title hsh["datacite.title"]
      }
      builder.publisher hsh["datacite.publisher"]
      builder.publicationYear hsh["datacite.publicationyear"]
      builder.resourceType(resourceTypeGeneral: hsh["datacite.resourcetypegeneral"]) {
        builder.text hsh["datacite.resourcetype"]
      }
      builder.descriptions {
        builder.description(descriptionType: "Abstract") {
          builder.text hsh["datacite.description"]
        }
      }
    }
  }
  # Using this save option to prevent NG from rendering new lines and tabs
  # between nodes. This to help with a cleaner anvl conversion. Similarly,
  # the sub should just remove the new line after the xml header that NG
  # adds, ex:
  #   <?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<resource ...
  xml = xml_builder
    .to_xml(save_with: Nokogiri::XML::Node::SaveOptions::AS_XML)
    .sub("\n", "")


  # Transform the hash
  hsh.reject! { |k, v| k =~ /^datacite\./ }
  hsh["datacite"] = xml
end