Class: Libis::Tools::MetsFile

Inherits:
Object
  • Object
show all
Includes:
ThreadSafe
Defined in:
lib/libis/tools/mets_file.rb,
lib/libis/tools/mets_dnx.rb,
lib/libis/tools/mets_objects.rb

Overview

noinspection RubyResolve

Defined Under Namespace

Modules: MetsObject Classes: AccessRightsPolicy, Collection, CreatingApplication, Div, DnxSection, EnvHardwareRegistry, EnvSoftwareRegistry, Environment, EnvironmentDependencies, EnvironmentHardware, EnvironmentSoftware, File, FileFixity, GeneralFileCharacteristics, GeneralIECharacteristics, GeneralRepCharacteristics, Inhibitors, Map, ObjectCharacteristics, PreservationLevel, Relationship, Representation, RetentionPolicy, SignatureInformation, WebHarvesting

Constant Summary collapse

NS =

Namespace constants for METS XML

{
    mets: 'http://www.loc.gov/METS/',
    dc: 'http://purl.org/dc/elements/1.1/',
    dnx: 'http://www.exlibrisgroup.com/dps/dnx',
    xlin: 'http://www.w3.org/1999/xlink',
}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ThreadSafe

#mutex

Constructor Details

#initialize ⇒ MetsFile

Creates an initializes a new Libis::Tools::MetsFile instance



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# File 'lib/libis/tools/mets_file.rb', line 55

def initialize
  @representations = {}
  @files = {}
  @divs = {}
  @maps = {}
  @dnx = {}
  @dc_record = nil
  @id_map = {}
end

Instance Attribute Details

#divs ⇒ Object (readonly)

Keeps track of Divs created



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# File 'lib/libis/tools/mets_file.rb', line 40

def divs
  @divs
end

#files ⇒ Object (readonly)

Keeps track of Files created



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# File 'lib/libis/tools/mets_file.rb', line 38

def files
  @files
end

#maps ⇒ Object (readonly)

Keeps track of Maps created



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# File 'lib/libis/tools/mets_file.rb', line 42

def maps
  @maps
end

#representations ⇒ Object (readonly)

Keeps track of Representations created



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# File 'lib/libis/tools/mets_file.rb', line 36

def representations
  @representations
end

Class Method Details

.parse(xml) ⇒ Hash

Reads an existing METS XML file and parses into a large Hash structure for inspection.

It will not immediately allow you to create a Libis::Tools::MetsFile instance from it, but with some inspection and knowledge of METS file structure it should be possible to recreate a similar file using the result.

The returned Hash has the following structure:

  • :amd - the general AMD section with subsections

  • :dmd - the general DMD section with the DC record(s)

Each amd section has one or more subsections with keys :tech, :rights, :source or :digiprov. Each subsection is a Hash with section id as key and an array as value. For each <record> element a Hash is added to the array with <key@id> as key and <key> content as value.



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# File 'lib/libis/tools/mets_file.rb', line 80

def self.parse(xml)
  xml_doc = case xml
              when String
                Libis::Tools::XmlDocument.parse(xml).document
              when Hash
                Libis::Tools::XmlDocument.from_hash(xml).document
              when Libis::Tools::XmlDocument
                xml.document
              when Nokogiri::XML::Document
                xml
              else
                raise ArgumentError, "Libis::Tools::MetsFile#parse does not accept input of type #{xml.class}"
            end

  dmd_sec = xml_doc.root.xpath('mets:dmdSec', NS).inject({}) do |hash_dmd, dmd|
    id = dmd[:ID]
    id = id.slice(0..(id.index('-dmd') + 3))
    hash_dmd[id] = dmd.xpath('.//dc:record', NS).first.children.inject({}) do |h, c|
      h[c.name] = c.content if c.name != 'text'
      h
    end
    hash_dmd
  end
  amd_sec = xml_doc.root.xpath('mets:amdSec', NS).inject({}) do |hash_amd, amd|
    id = amd[:ID]
    id = id.slice(0..(id.index('-amd') + 3))
    hash_amd[id] = [:tech, :rights, :source, :digiprov].inject({}) do |hash_sec, sec|
      md = amd.xpath("mets:#{sec}MD", NS).first
      return hash_sec unless md
      # hash_sec[sec] = md.xpath('mets:mdWrap/dnx:dnx/dnx:section', NS).inject({}) do |hash_md, dnx_sec|
      hash_sec[sec] = md.xpath('.//dnx:section', NS).inject({}) do |hash_md, dnx_sec|
        hash_md[dnx_sec[:id]] = dnx_sec.xpath('dnx:record', NS).inject([]) do |records, dnx_record|
          records << dnx_record.xpath('dnx:key', NS).inject({}) do |record_hash, key|
            record_hash[key[:id]] = key.content
            record_hash
          end
          records
        end
        hash_md
      end
      hash_sec
    end
    hash_amd
  end
  rep_sec = xml_doc.root.xpath('.//mets:fileGrp', NS).inject({}) do |hash_rep, rep|
    hash_rep[rep[:ID]] = {
        amd: amd_sec[rep[:ADMID]],
        dmd: amd_sec[rep[:DMDID]]
    }.cleanup.merge(
        rep.xpath('mets:file', NS).inject({}) do |hash_file, file|
          hash_file[file[:ID]] = {
              group: file[:GROUPID],
              amd: amd_sec[file[:ADMID]],
              dmd: dmd_sec[file[:DMDID]],
          }.cleanup
          hash_file
        end
    )
    hash_rep
  end
  {amd: amd_sec['ie-amd'],
   dmd: dmd_sec['ie-dmd'],
  }.cleanup.merge(
      xml_doc.root.xpath('.//mets:structMap[@TYPE="PHYSICAL"]', NS).inject({}) do |hash_map, map|
        rep_id = map[:ID].gsub(/-\d+$/, '')
        rep = rep_sec[rep_id]
        div_parser = lambda do |div|
          if div[:TYPE] == 'FILE'
            file_id = div.xpath('mets:fptr').first[:FILEID]
            {
                id: file_id
            }.merge rep[file_id]
          else
            div.children.inject({}) do |hash, child|
              # noinspection RubyScope
              hash[child[:LABEL]] = div_parser.call(child)
              hash
            end
          end
        end
        hash_map[map.xpath('mets:div').first[:LABEL]] = {
            id: rep_id,
            amd: rep_sec[rep_id][:amd],
            dmd: rep_sec[rep_id][:dmd],
        }.cleanup.merge(
            map.xpath('mets:div', NS).inject({}) do |hash, div|
              hash[div[:LABEL]] = div_parser.call(div)
            end
        )
        hash_map
      end
  )
end

Instance Method Details

#amd_info=(hash) ⇒ Object

Sets the attributes for the global amd section.

sections automatically.

The following names are currently supported:
* status
* entity_type
* user_a
* user_b
* user_c
* submission_reason
* retention_id - RentionPolicy ID
* harvest_url
* harvest_id
* harvest_target
* harvest_group
* harvest_date
* harvest_time
* collection_id - Collection ID where the IE should be added to
* access_right - AccessRight ID
* source_metadata - Array with hashes like {type: 'MyXML', data: '<xml ....>'}



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# File 'lib/libis/tools/mets_file.rb', line 202

def amd_info=(hash)
  tech_data = []
  data = {
      groupID: hash[:group_id]
  }.cleanup
  tech_data << ObjectCharacteristics.new(data) unless data.empty?
  data = {
      status: hash[:status],
      IEEntityType: hash[:entity_type],
      UserDefinedA: hash[:user_a],
      UserDefinedB: hash[:user_b],
      UserDefinedC: hash[:user_c],
      submissionReason: hash[:submission_reason],
  }.cleanup
  tech_data << GeneralIECharacteristics.new(data) unless data.empty?
  data = {
      policyId: hash[:retention_id],
  }.cleanup
  tech_data << RetentionPolicy.new(data) unless data.empty?
  data = {
      primarySeedURL: hash[:harvest_url],
      WCTIdentifier: hash[:harvest_id],
      targetName: hash[:harvest_target],
      group: hash[:harvest_group],
      harvestDate: hash[:harvest_date],
      harvestTime: hash[:harvest_time],
  }.cleanup
  tech_data << WebHarvesting.new(data) unless data.empty?
  data = {
      collectionId: hash[:collection_id]
  }.cleanup
  tech_data << Collection.new(data) unless data.empty?
  @dnx[:tech] = tech_data unless tech_data.empty?
  data = {
      policyId: hash[:access_right]
  }.cleanup
  rights_data = []
  rights_data << AccessRightsPolicy.new(data) unless data.empty?
  @dnx[:rights] = rights_data unless rights_data.empty?
  (hash[:source_metadata] || []).each_with_index do |metadata, i|
    @dnx["source-#{metadata[:type].to_s.upcase}-#{i+1}"] = metadata[:data]
  end
end

#dc_record=(xml) ⇒ Object

Sets the DC record for the global amd section.



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# File 'lib/libis/tools/mets_file.rb', line 177

def dc_record=(xml)
  @dc_record = xml
end

#div(hash = {}) ⇒ Libis::Tools::MetsFile::Div

Create a new division. See Div for supported Hash keys.



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# File 'lib/libis/tools/mets_file.rb', line 266

def div(hash = {})
  div = Libis::Tools::MetsFile::Div.new
  div.set_id get_id(::Libis::Tools::MetsFile::Div)
  div.set_from_hash hash
  @divs[div.id] = div
end

#file(hash = {}) ⇒ Libis::Tools::MetsFile::File

Create a new file. See File for supported Hash keys.



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# File 'lib/libis/tools/mets_file.rb', line 276

def file(hash = {})
  file = Libis::Tools::MetsFile::File.new
  file.set_id get_id(::Libis::Tools::MetsFile::File)
  file.set_from_hash hash
  @files[file.id] = file
end

#get_id(klass) ⇒ Object 



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# File 'lib/libis/tools/mets_file.rb', line 246

def get_id(klass)
  self.mutex.synchronize do
    @id_map[klass] = (@id_map[klass] ? @id_map[klass] + 1 : 1)
    return @id_map[klass]
  end
end

#map(rep, div, logical = false) ⇒ Libis::Tools::MetsFile::Map

Create a new structmap.



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# File 'lib/libis/tools/mets_file.rb', line 288

def map(rep, div, logical = false)
  map = Libis::Tools::MetsFile::Map.new
  map.set_id get_id(::Libis::Tools::MetsFile::Map)
  map.representation = rep
  map.div = div
  map.is_logical = logical
  @maps[map.id] = map
end

#representation(hash = {}) ⇒ Libis::Tools::MetsFile::Representation

Create a new representation. See Representation for supported Hash keys.



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# File 'lib/libis/tools/mets_file.rb', line 256

def representation(hash = {})
  rep = ::Libis::Tools::MetsFile::Representation.new
  rep.set_id get_id(::Libis::Tools::MetsFile::Representation)
  rep.set_from_hash hash
  @representations[rep.id] = rep
end

#xml_doc ⇒ Libis::Tools::XmlDocument

Create the METS XML document.



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# File 'lib/libis/tools/mets_file.rb', line 299

def xml_doc
  ::Libis::Tools::XmlDocument.build do |xml|
    xml[:mets].mets(
        'xmlns:mets' => NS[:mets],
    ) {
      add_dmd(xml)
      add_amd(xml)
      add_filesec(xml)
      add_struct_map(xml)
    }
  end
end