From: Wes Gamble <weyus@...>
Date: 2007-01-24T14:09:02+09:00
Subject: Re: Xalan with Ruby (either command line or via Jrb)?

A better solution - use strings for input/output and no need to write 
files.  The return value from this method is the transformed XML.

==============================================================================
require 'rjb'

require_gem 'rjb', '>= 1.0.2'

module XalanSupport
  def XalanSupport.load_Xalan_libraries
    ['serializer.jar', 'xml-apis.jar', 'xercesImpl.jar', 
'xalan.jar'].each do |lib_name|
      Rjb::load("#{RAILS_ROOT}/lib/#{lib_name}", ['-Xmx512M'])
    end
  end

  def XalanSupport.do_XSL_transform(instring, xsl_file_name)
    #Load all of the Jars
    XalanSupport.load_Xalan_libraries

    #Load all the classes
    string_reader_class = Rjb::import('java.io.StringReader')
    string_writer_class = Rjb::import('java.io.StringWriter')
    stream_source_class = 
Rjb::import('javax.xml.transform.stream.StreamSource')
    stream_result_class = 
Rjb::import('javax.xml.transform.stream.StreamResult')
    transformer_factory_class = 
Rjb::import('javax.xml.transform.TransformerFactory')

    #Set up the input and output
    input_string_reader = string_reader_class.new(instring)
    output_string_writer = string_writer_class.new
    source = stream_source_class.new(input_string_reader)
    result = stream_result_class.new(output_string_writer)

    #Create the XSL transformer
    transformer_factory = transformer_factory_class.newInstance
    transformer = 
transformer_factory.newTransformer(stream_source_class.new(xsl_file_name))

    transformer.transform(source, result)

    result.getWriter.getBuffer.toString
  end
end

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