a code that convert from fo to pdf in groovy

topdf.groovy

@Grab(group='org.apache.xmlgraphics', module='fop', version='1.0')

import org.apache.fop.apps.*
import javax.xml.transform.*
import javax.xml.transform.sax.SAXResult
import javax.xml.transform.stream.StreamSource


def fo = new File(args[0])
def pdf = new File(args[1])

def fopFactory = FopFactory.newInstance()
def foUserAgent = fopFactory.newFOUserAgent()
def out = new BufferedOutputStream( new FileOutputStream(pdf) )
def fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent, out)
def factory = TransformerFactory.newInstance()
def transformer = factory.newTransformer() // identity transformer
def src = new StreamSource(fo)
def res = new SAXResult(fop.getDefaultHandler())
transformer.transform(src, res)

// Result processing
def foResults = fop.results
foResults.getPageSequences().each{ pageSequenceResults->
	def log = ''<<''
	log << 'PageSequence ' 
	log << (String.valueOf(pageSequenceResults.getID()).length() > 0 ? pageSequenceResults.getID() : "<no id>") 
	log << ' generated ' + pageSequenceResults.getPageCount() + ' pages.'
	println log.toString()
}
println "Generated ${foResults.getPageCount()} pages in total."

out.close()