Class: Dor::FileMetadataMergeService

Inherits:
Object
  • Object
show all
Extended by:
Deprecation
Defined in:
lib/dor/services/file_metadata_merge_service.rb

Overview

Merges contentMetadata from several objects into one.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(primary, secondary_druids) ⇒ FileMetadataMergeService

Returns a new instance of FileMetadataMergeService.



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# File 'lib/dor/services/file_metadata_merge_service.rb', line 15

def initialize(primary, secondary_druids)
  @pid = primary.pid
  content_metadata = primary.contentMetadata
  content_metadata.ng_xml_will_change!
  @primary_cm = content_metadata.ng_xml
  @secondary_druids = secondary_druids
end

Class Method Details

.copy_file_resources(primary, secondary_druids) ⇒ Object

Parameters:

  • secondary_druids (Array<String>) —

    ids of the secondary objects that will get their contentMetadata merged into this one



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# File 'lib/dor/services/file_metadata_merge_service.rb', line 10

def self.copy_file_resources(primary, secondary_druids)
  merge_service = FileMetadataMergeService.new primary, secondary_druids
  merge_service.copy_file_resources
end

Instance Method Details

#copy_file_resources ⇒ Object

Appends contentMetadata file resources from the source objects to this object



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# File 'lib/dor/services/file_metadata_merge_service.rb', line 24

def copy_file_resources
  base_id = primary_cm.at_xpath('/contentMetadata/@objectId').value
  max_sequence = primary_cm.at_xpath('/contentMetadata/resource[last()]/@sequence').value.to_i

  secondary_druids.each do |src_pid|
    source_obj = Dor.find src_pid
    source_cm = source_obj.contentMetadata.ng_xml

    # Copy the resources from each source object
    source_cm.xpath('/contentMetadata/resource').each do |old_resource|
      max_sequence += 1
      resource_copy = old_resource.clone
      resource_copy['sequence'] = max_sequence.to_s

      # Append sequence number to each secondary filename, then
      # look for filename collisions with the primary object
      resource_copy.xpath('file').each do |secondary_file|
        secondary_file['id'] = SecondaryFileNameService.create(secondary_file['id'], max_sequence)

        if primary_cm.at_xpath("//file[@id = '#{secondary_file['id']}']")
          raise Dor::Exception, "File '#{secondary_file['id']}' from secondary object #{src_pid} already exist in primary object: #{pid}"
        end
      end

      if old_resource['type']
        resource_copy['id'] = "#{old_resource['type']}_#{max_sequence}"
      else
        resource_copy['id'] = "#{base_id}_#{max_sequence}"
      end

      lbl = old_resource.at_xpath 'label'
      resource_copy.at_xpath('label').content = "#{Regexp.last_match(1)} #{max_sequence}" if lbl && lbl.text =~ /^(.*)\s+\d+$/

      primary_cm.at_xpath('/contentMetadata/resource[last()]').add_next_sibling resource_copy
      attr_node = primary_cm.create_element 'attr', src_pid, name: 'mergedFromPid'
      resource_copy.first_element_child.add_previous_sibling attr_node
      attr_node = primary_cm.create_element 'attr', old_resource['id'], name: 'mergedFromResource'
      resource_copy.first_element_child.add_previous_sibling attr_node
    end
  end
end