Class: Dor::ContentMetadataDS

Inherits:
ActiveFedora::OmDatastream
  • Object
show all
Defined in:
lib/dor/datastreams/content_metadata_ds.rb

Instance Method Summary collapse

Instance Method Details

#add_file(file, resource_name) ⇒ Nokogiri::XML::Node

Returns the added XML node.

Parameters:

  • file (Object)
  • resource_name (String)

Returns:



141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 141

def add_file(file, resource_name)
  resource_nodes = ng_xml.search('//resource[@id=\'' + resource_name + '\']')
  raise 'resource doesnt exist.' if resource_nodes.length == 0

  ng_xml_will_change!

  node = resource_nodes.first
  file_node = Nokogiri::XML::Node.new('file', ng_xml)
  file_node['id'] = file[:name]
  file_node['shelve'] = file[:shelve] || ''
  file_node['publish'] = file[:publish] || ''
  file_node['preserve'] = file[:preserve] || ''
  node.add_child(file_node)

  %i[md5 sha1].each do |algo|
    next unless file[algo]

    checksum_node = Nokogiri::XML::Node.new('checksum', ng_xml)
    checksum_node['type'] = algo.to_s
    checksum_node.content = file[algo]
    file_node.add_child(checksum_node)
  end
  file_node['size'] = file[:size] if file[:size]
  file_node['mimetype'] = file[:mime_type] if file[:mime_type]
  file_node['role'] = file[:role] if file[:role]
  file_node
end

#add_resource(files, resource_name, position, type = 'file') ⇒ Nokogiri::XML::Node

Returns the new resource that was added to the contentMetadata.

Parameters:

  • files (Array)
  • resource_name (String) —

    ID of the resource

  • position (Integer)
  • type (String) (defaults to: 'file') —

    Resource type

Returns:



199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 199

def add_resource(files, resource_name, position, type = 'file')
  raise "resource #{resource_name} already exists" if ng_xml.search('//resource[@id=\'' + resource_name + '\']').length > 0

  ng_xml_will_change!
  max = ng_xml.search('//resource').map { |node| node['sequence'].to_i }.max
  # renumber all of the resources that will come after the newly added one
  while max > position
    node = ng_xml.search('//resource[@sequence=\'' + position + '\']')
    node.first[sequence] = max + 1 if node.length > 0
    max -= 1
  end
  node = Nokogiri::XML::Node.new('resource', ng_xml)
  node['sequence'] = position.to_s
  node['id']       = resource_name
  node['type']     = type
  files.each do |file|
    file_node = Nokogiri::XML::Node.new('file', ng_xml)
    %w(shelve publish preserve).each { |x| file_node[x] = file[x.to_sym] || '' }
    file_node['id'] = file[:name]
    node.add_child(file_node)

    %i[md5 sha1].each do |algo|
      next if file[algo].nil?

      checksum_node = Nokogiri::XML::Node.new('checksum', ng_xml)
      checksum_node['type'] = algo.to_s
      checksum_node.content = file[algo]
      file_node.add_child(checksum_node)
    end
    file_node['size'] = file[:size] if file[:size]
    file_node['role'] = file[:role] if file[:role]
  end
  ng_xml.search('//contentMetadata').first.add_child(node)
  node
end

#add_virtual_resource(child_druid, child_resource) ⇒ Nokogiri::XML::Element

Copies the child’s resource into the parent (self) as a virtual resource. Assumes the resource isn’t a duplicate of an existing virtual or real resource.

Parameters:

  • child_druid (String) —

    druid

  • child_resource (Nokogiri::XML::Element)

Returns:

  • (Nokogiri::XML::Element) —

    the new resource that was added to the contentMetadata



174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 174

def add_virtual_resource(child_druid, child_resource)
  # create a virtual resource element with attributes linked to the child and omit label
  ng_xml_will_change!
  sequence_max = ng_xml.search('//resource').map { |node| node[:sequence].to_i }.max
  resource = Nokogiri::XML::Element.new('resource', ng_xml)
  resource[:sequence] = sequence_max + 1
  resource[:id] = "#{pid.gsub(/^druid:/, '')}_#{resource[:sequence]}"
  resource[:type] = child_resource[:type]

  # iterate over all the published files and link to them
  child_resource.search('file[@publish=\'yes\']').each do |file|
    resource << generate_external_file_node(child_druid, child_resource[:id], file[:id], file[:mimetype])
  end
  resource << generate_also_available_as_node(child_druid)

  # attach the virtual resource as a sibling and return
  ng_xml.root << resource
  resource
end

#generate_also_available_as_node(objectId) ⇒ Nokogiri::XML::Element

Generates the XML tree for virtual resource relationship reference. For example:

<relationship type="alsoAvailableAs" objectId="druid:mn123pq4567" />

Parameters:

  • objectId (String) —

    the linked druid

Returns:

  • (Nokogiri::XML::Element) 


73
74
75
76
77
78
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 73

def generate_also_available_as_node(objectId)
  relationship = ng_xml.create_element 'relationship'
  relationship[:type] = 'alsoAvailableAs'
  relationship[:objectId] = objectId
  relationship
end

#generate_external_file_node(objectId, resourceId, fileId, mimetype) ⇒ Nokogiri::XML::Element

Generates the XML tree for externalFile references. For example:

<externalFile objectId="druid:mn123pq4567" resourceId="Image01" fileId="image_01.jp2000" mimetype="image/jp2" />

Parameters:

  • objectId (String) —

    the linked druid

  • resourceId (String) —

    the linked druid’s resource identifier

  • fileId (String) —

    the linked druid’s resource’s file identifier

  • mimetype (String) —

    the file’s MIME type

Returns:

  • (Nokogiri::XML::Element) 


60
61
62
63
64
65
66
67
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 60

def generate_external_file_node(objectId, resourceId, fileId, mimetype)
  externalFile = ng_xml.create_element 'externalFile'
  externalFile[:objectId]   = objectId
  externalFile[:resourceId] = resourceId
  externalFile[:fileId]     = fileId
  externalFile[:mimetype]   = mimetype
  externalFile
end

#move_resource(resource_name, new_position) ⇒ Nokogiri::XML::Element

You just had to have ordered lists in XML, didn’t you? Re-enumerate the sequence numbers affected

Parameters:

  • resource_name (String) —

    unique id attribute of the resource

  • new_position (Integer, String) —

    new sequence number of the resource, or a string that looks like one

Returns:

  • (Nokogiri::XML::Element) —

    the resource node



334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 334

def move_resource(resource_name, new_position)
  ng_xml_will_change!
  node = singular_node('//resource[@id=\'' + resource_name + '\']')
  position = node['sequence'].to_i
  new_position = new_position.to_i # tolerate strings as a Legacy behavior
  return node if position == new_position

  # otherwise, is the resource being moved earlier in the sequence or later?
  up = new_position > position
  others = new_position..(up ? position - 1 : position + 1) # a range
  others.each do |i|
    item = ng_xml.at_xpath('/resource[@sequence=\'' + i.to_s + '\']')
    item['sequence'] = (up ? i - 1 : i + 1).to_s # if you're going up, everything else comes down and vice versa
  end
  node['sequence'] = new_position.to_s # set the node we already had last, so we don't hit it twice!
  node
end

#prefix ⇒ Object

maintain AF < 8 indexing behavior



368
369
370
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 368

def prefix
  ''
end

#remove_file(file_name) ⇒ Object

Parameters:

  • file_name (String) —

    ID of the file element



251
252
253
254
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 251

def remove_file(file_name)
  ng_xml_will_change!
  ng_xml.search('//file[@id=\'' + file_name + '\']').each(&:remove)
end

#remove_resource(resource_name) ⇒ Object

Parameters:

  • resource_name (String) —

    ID of the resource



236
237
238
239
240
241
242
243
244
245
246
247
248
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 236

def remove_resource(resource_name)
  ng_xml_will_change!
  node = singular_node('//resource[@id=\'' + resource_name + '\']')
  position = node['sequence'].to_i + 1
  node.remove
  loop do
    res = ng_xml.search('//resource[@sequence=\'' + position.to_s + '\']')
    break if res.length == 0

    res['sequence'] = position.to_s
    position += 1
  end
end

#rename_file(old_name, new_name) ⇒ Nokogiri::XML::Element

Returns the file node.

Parameters:

  • old_name (String) —

    unique id attribute of the file element

  • new_name (String) —

    new unique id value being assigned

Returns:

  • (Nokogiri::XML::Element) —

    the file node



297
298
299
300
301
302
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 297

def rename_file(old_name, new_name)
  ng_xml_will_change!
  file_node = ng_xml.search('//file[@id=\'' + old_name + '\']').first
  file_node['id'] = new_name
  file_node
end

#set_content_type(old_type, old_resource_type, new_type, new_resource_type) ⇒ Object

Set the content type (e.g. “book”) and the resource type (e.g. “book”) for all resources

Parameters:

  • old_type (String) —

    the old content type

  • old_resource_type (String) —

    the old type for all resources

  • new_type (String) —

    the new content type

  • new_resource_type (String) —

    the new type for all resources



357
358
359
360
361
362
363
364
365
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 357

def set_content_type(old_type, old_resource_type, new_type, new_resource_type)
  ng_xml_will_change!
  ng_xml.search('/contentMetadata[@type=\'' + old_type + '\']').each do |node|
    node['type'] = new_type
    ng_xml.search('//resource[@type=\'' + old_resource_type + '\']').each do |resource|
      resource['type'] = new_resource_type
    end
  end
end

#singular_node(xpath) ⇒ Nokogiri::XML::Element

Only use this when you want the behavior of raising an exception if anything besides exactly one matching node is found. Otherwise just use .xpath, .at_xpath or .search.

Parameters:

  • xpath (String) —

    accessor invocation for Nokogiri xpath

Returns:

  • (Nokogiri::XML::Element) —

    the matched element



44
45
46
47
48
49
50
51
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 44

def singular_node(xpath)
  node = ng_xml.search(xpath)
  len  = node.length
  raise "#{xpath} not found" if len < 1
  raise "#{xpath} duplicated: #{len} found" if len != 1

  node.first
end

#to_solr(solr_doc = {}, *_args) ⇒ Object

Terminology-based solrization is going to be painfully slow for large contentMetadata streams. Just select the relevant elements instead. TODO: Call super()?



83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 83

def to_solr(solr_doc = {}, *_args)
  doc = ng_xml
  return solr_doc unless doc.root['type']

  preserved_size = 0
  shelved_size = 0
  counts = Hash.new(0)                # default count is zero
  resource_type_counts = Hash.new(0)  # default count is zero
  file_roles = ::Set.new
  mime_types = ::Set.new
  first_shelved_image = nil

  doc.xpath('contentMetadata/resource').sort { |a, b| a['sequence'].to_i <=> b['sequence'].to_i }.each do |resource|
    counts['resource'] += 1
    resource_type_counts[resource['type']] += 1 if resource['type']
    resource.xpath('file').each do |file|
      counts['content_file'] += 1
      preserved_size += file['size'].to_i if file['preserve'] == 'yes'
      shelved_size += file['size'].to_i if file['shelve'] == 'yes'
      if file['shelve'] == 'yes'
        counts['shelved_file'] += 1
        first_shelved_image ||= file['id'] if file['id'] =~ /jp2$/
      end
      mime_types << file['mimetype']
      file_roles << file['role'] if file['role']
    end
  end
  solr_doc['content_type_ssim'] = doc.root['type']
  solr_doc['content_file_mimetypes_ssim'] = mime_types.to_a
  solr_doc['content_file_count_itsi'] = counts['content_file']
  solr_doc['shelved_content_file_count_itsi'] = counts['shelved_file']
  solr_doc['resource_count_itsi'] = counts['resource']
  solr_doc['preserved_size_dbtsi'] = preserved_size # double (trie) to support very large sizes
  solr_doc['shelved_size_dbtsi'] = shelved_size # double (trie) to support very large sizes
  solr_doc['resource_types_ssim'] = resource_type_counts.keys if resource_type_counts.size > 0
  solr_doc['content_file_roles_ssim'] = file_roles.to_a if file_roles.size > 0
  resource_type_counts.each do |key, count|
    solr_doc["#{key}_resource_count_itsi"] = count
  end
  # first_shelved_image is neither indexed nor multiple
  solr_doc['first_shelved_image_ss'] = first_shelved_image unless first_shelved_image.nil?
  solr_doc
end

#unshelve_and_unpublish ⇒ Object

END: READ ONLY METHODS DATSTREAM WRITING METHODS



130
131
132
133
134
135
136
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 130

def unshelve_and_unpublish
  ng_xml.xpath('/contentMetadata/resource//file').each_with_index do |file_node, index|
    ng_xml_will_change! if index == 0
    file_node['publish'] = 'no'
    file_node['shelve'] = 'no'
  end
end

#update_attributes(file_name, publish, shelve, preserve, attributes = {}) ⇒ Object

Parameters:

  • file_name (String) —

    ID of the file element

  • publish (String)
  • shelve (String)
  • preserve (String) 


260
261
262
263
264
265
266
267
268
269
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 260

def update_attributes(file_name, publish, shelve, preserve, attributes = {})
  ng_xml_will_change!
  file_node = ng_xml.search('//file[@id=\'' + file_name + '\']').first
  file_node['publish'] = publish
  file_node['shelve'] = shelve
  file_node['preserve'] = preserve
  attributes.each do |key, value|
    file_node[key] = value
  end
end

#update_file(file, old_file_id) ⇒ Object

Parameters:

  • file (Object) —

    some hash-like file

  • old_file_id (String) —

    unique id attribute of the file element



273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 273

def update_file(file, old_file_id)
  ng_xml_will_change!
  file_node = ng_xml.search('//file[@id=\'' + old_file_id + '\']').first
  file_node['id'] = file[:name]
  %i[md5 sha1].each do |algo|
    next if file[algo].nil?

    checksum_node = ng_xml.search('//file[@id=\'' + old_file_id + '\']/checksum[@type=\'' + algo.to_s + '\']').first
    if checksum_node.nil?
      checksum_node = Nokogiri::XML::Node.new('checksum', ng_xml)
      file_node.add_child(checksum_node)
    end
    checksum_node['type'] = algo.to_s
    checksum_node.content = file[algo]
  end

  %i[size shelve preserve publish role].each do |x|
    file_node[x.to_s] = file[x] if file[x]
  end
end

#update_resource_label(resource_name, new_label) ⇒ Nokogiri::XML::Element

Updates old label OR creates a new one if necessary

Parameters:

  • resource_name (String) —

    unique id attribute of the resource

  • new_label (String) —

    label value being assigned

Returns:

  • (Nokogiri::XML::Element) —

    the resource node



308
309
310
311
312
313
314
315
316
317
318
319
320
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 308

def update_resource_label(resource_name, new_label)
  ng_xml_will_change!
  node = singular_node('//resource[@id=\'' + resource_name + '\']')
  labels = node.xpath('./label')
  if labels.length == 0
    label_node = Nokogiri::XML::Node.new('label', ng_xml) # create a label
    label_node.content = new_label
    node.add_child(label_node)
  else
    labels.first.content = new_label
  end
  node
end

#update_resource_type(resource_name, new_type) ⇒ Object

Parameters:

  • resource_name (String) —

    unique id attribute of the resource

  • new_type (String) —

    type value being assigned



324
325
326
327
 
# File 'lib/dor/datastreams/content_metadata_ds.rb', line 324

def update_resource_type(resource_name, new_type)
  ng_xml_will_change!
  singular_node('//resource[@id=\'' + resource_name + '\']')['type'] = new_type
end