Class: MARC::FastXMLWriter

Inherits:
XMLWriter
  • Object
show all
Defined in:
lib/marc/fastxmlwriter.rb

Constant Summary collapse

XML_HEADER = 
'<?xml version="1.0" encoding="UTF-8"?>'
OPEN_COLLECTION = 
"<collection">
OPEN_COLLECTION_NAMESPACE = %Q{<collection xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.loc.gov/MARC21/slim" xsi:schemaLocation="http://www.loc.gov/MARC21/slim http://www.loc.gov/standards/marcxml/schema/MARC21slim.xsd">}

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file, opts = {}) ⇒ FastXMLWriter

Returns a new instance of FastXMLWriter.



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# File 'lib/marc/fastxmlwriter.rb', line 15

def initialize(file, opts={})
  super
end

Class Method Details

.encode(r, opts = {}) ⇒ Object 



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# File 'lib/marc/fastxmlwriter.rb', line 59

def encode(r, opts={})
  xml = "<record>"

  # MARCXML only allows alphanumerics or spaces in the leader
  lead = r.leader.gsub(/[^\w|^\s]/, 'Z').encode(:xml=>:text)

  # MARCXML is particular about last four characters; ILSes aren't
  lead.ljust(23, ' ')[20..23] = "4500"

  # MARCXML doesn't like a space here so we need a filler character: Z
  if (lead[6..6] == " ")
    lead[6..6] = "Z"
  end

  xml << "<leader>" << lead.encode(:xml => :text) << '</leader>'
  r.each do |f|
    if f.class == MARC::DataField
      xml << open_datafield(f.tag, f.indicator1, f.indicator2)
      f.each do |sf|
        xml << open_subfield(sf.code) << sf.value.encode(:xml => :text) << '</subfield>'
      end
      xml << '</datafield>'
    elsif f.class == MARC::ControlField
      xml << open_controlfield(f.tag) << f.value.encode(:xml=>:text) << '</controlfield>'
    end
  end
  xml << '</record>'
  return xml.force_encoding('utf-8')
end

.open_collection(use_ns) ⇒ Object 



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# File 'lib/marc/fastxmlwriter.rb', line 26

def open_collection(use_ns)
  if use_ns
    %Q{<collection xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:marc="http://www.loc.gov/MARC21/slim" xsi:schemaLocation="http://www.loc.gov/MARC21/slim http://www.loc.gov/standards/marcxml/schema/MARC21slim.xsd">}.dup
  else
    "<collection>".dup
  end
end

.open_controlfield(tag) ⇒ Object 



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# File 'lib/marc/fastxmlwriter.rb', line 54

def open_controlfield(tag)
  # return "\n<controlfield tag=\"#{tag}\">"
  return "<controlfield tag=\"#{tag}\">"
end

.open_datafield(tag, ind1, ind2) ⇒ Object 



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# File 'lib/marc/fastxmlwriter.rb', line 44

def open_datafield(tag, ind1, ind2)
  # return "\n  <datafield tag=\"#{tag}\" ind1=\"#{ind1}\" ind2=\"#{ind2}\">"
  return "<datafield tag=\"#{tag}\" ind1=\"#{ind1}\" ind2=\"#{ind2}\">"
end

.open_subfield(code) ⇒ Object 



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# File 'lib/marc/fastxmlwriter.rb', line 49

def open_subfield(code)
  # return "\n    <subfield code=\"#{code}\">"
  return "<subfield code=\"#{code}\">"
end

.single_record_document(r, opts = {}) ⇒ Object 



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# File 'lib/marc/fastxmlwriter.rb', line 35

def single_record_document(r, opts={})
  
  xml = XML_HEADER.dup
  xml << open_collection(opts[:include_namespace])
  xml << encode(r, opts)
  xml << '</collection>'
  xml
end

Instance Method Details

#write(record) ⇒ Object 



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# File 'lib/marc/fastxmlwriter.rb', line 19

def write(record)
  @fh.write(self.class.encode(record))
  # @fh.write("\n")
end