Module: JasperRails::Jasper::Rails

Defined in:
lib/jasper-rails.rb

Class Method Summary collapse

Class Method Details

.render_pdf(jasper_file, datasource, parameters, options) ⇒ Object 



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# File 'lib/jasper-rails.rb', line 36

def self.render_pdf(jasper_file, datasource, parameters, options)
  options ||= {}
  parameters ||= {}
  jrxml_file  = jasper_file.sub(/\.jasper$/, ".jrxml")

  begin
    # Convert the ruby parameters' hash to a java HashMap.
    # Pay attention that, for now, all parameters are converted to string!
    jasper_params = HashMap.new
    parameters.each do |k,v|
      jasper_params.put(JavaString.new(k.to_s), JavaString.new(v.to_s))
    end

    # Compile it, if needed
    if !File.exist?(jasper_file) || (File.exist?(jrxml_file) && File.mtime(jrxml_file) > File.mtime(jasper_file))
      JasperCompileManager.compileReportToFile(jrxml_file, jasper_file)
    end

    # Fill the report
    input_source = InputSource.new
    input_source.setCharacterStream(StringReader.new(datasource.to_xml(options).to_s))
    data_document = silence_warnings do
      # This is here to avoid the "already initialized constant DOCUMENT_POSITION_*" warnings.
      # It's harmless. But pretty annoying.
      JRXmlUtils._invoke('parse', 'Lorg.xml.sax.InputSource;', input_source)
    end

    jasper_params.put(JRXPathQueryExecuterFactory.PARAMETER_XML_DATA_DOCUMENT, data_document)
    jasper_print = JasperFillManager.fillReport(jasper_file, jasper_params)

    # Export it!
    JasperExportManager._invoke('exportReportToPdf', 'Lnet.sf.jasperreports.engine.JasperPrint;', jasper_print)
  rescue Exception=>e
    if e.respond_to? 'printStackTrace'
      puts e.message
      e.printStackTrace
    else
      puts e.message
      puts e.backtrace
    end
  end
end