Drools. How to convert DRL file to XML format and XML file to DRL file format

With the Drools api helper classes, it is very easy to convert a provided drl file to a corresponding xml. Similarly it is very easy to convert from xml file to drl file. Following example code explains how.

public class DroolsConversionHelper {

public static void main(String args[]) throws Exception {

System.out.println(convertDrlFileToXml("/sample.drl"));

System.out.println(convertXmlToDrlFile("/sample.xml"));

}

private static String convertDrlFileToXml(String drlFileName) throws Exception {

Reader source = new InputStreamReader(

DroolsConversionHelper.class.getResourceAsStream(drlFileName));

DrlParser drlParser = new DrlParser();

PackageDescr pkgDesc = drlParser.parse(source);

XmlDumper xmlDumper = new XmlDumper();

String xml = xmlDumper.dump(pkgDesc);

return xml;

}

private static String convertXmlToDrlFile(String xmlFileName) throws Exception {

Reader source = new InputStreamReader(

DroolsConversionHelper.class.getResourceAsStream(xmlFileName));

XmlPackageReader xmlPackageReader = new XmlPackageReader();

PackageDescr pkgDesc = xmlPackageReader.read(source);

DrlDumper drlDumper = new DrlDumper();

String drl = drlDumper.dump(pkgDesc);

return drl;

}

}