Drools 将DSLR转化为DRL
Scala的代码只能用Java着色。
gist 链接如下： https://gist.github.com/2574987
class DrlGeneratorFromDsl { private val logger = LoggerFactory.getLogger(getClass) private var dslFiles = List.empty[DSLTokenizedMappingFile] def addDsl(resource: Resource) { val file = new DSLTokenizedMappingFile if (!file.parseAndLoad(resource.getReader)) { file.getErrors.asScala.foreach(e => logger.error(e.asInstanceOf[ParserError].getMessage)) } dslFiles :+= file } // this is dslr type rule def generate(rules: Iterable[RuleData]): String = { val dslr = rules.map(_.toDslr).mkString("\n") val expander = getDslExpander val drl = expander.expand(dslr) if (expander.hasErrors) { expander.getErrors.asScala.foreach(e => logger.error(e.getMessage)) } return drlHeader + drl } private val drlHeader = """package logistics.settlement.drools.drl.genimport logistics.settlement.drools.OrderData;import logistics.settlement.drools.UnitPrice;""" /** * Returns an expander for DSLs (only if there is a DSL configured for this * package). */ private def getDslExpander: DefaultExpander = { var expander: DefaultExpander = new DefaultExpander for (file <- this.dslFiles) { expander.addDSLMapping(file.getMapping) } return expander }}