[rules-users] DRL to XML transformation

Michael Anstis michael.anstis at gmail.com
Thu May 31 09:26:25 EDT 2012 

The XML format produced by XmlDumper is an XML representation of various
internal Descriptors used by Drools Expert and only supports features up to
4.0

It is unfortunately not the same as that stored internally in Guvnor (which
is simply a XStream representation of Guvnor's internal model).

Furthermore Guvnor's internal representation is private and subject to
change from release to release.

There is no easy way to convert from one to the other, other than writing
your own XSLT.

With kind regards,

Mike

On 29 May 2012 13:36, Anirban Bandyopadhyay <
Anirban.Bandyopadhyay at monitisegroup.com> wrote:

>  Hi,****
>
> ** **
>
> We have a set of rule files in DRL format.  We couldn’t find a way (tool)
> of importing them into Guvnor as BRL file so that we can edit using the
> designer.****
>
> ** **
>
> We ended up using the DrlParser and XmlDumper to transform them from DRL
> to BRL.  It produces the XML and when we add it to the repository using
> WebDav, Guvnor lists the files under Business Rule which is perfect.  BUT
> when I try to open it, it throws the following error:****
>
> ** **
>
>
> com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$Unkno
> ****
>
> wnFieldException: No such field
> org.drools.ide.common.client.modeldriven.brl.Rul****
>
> eModel.rule-attribute****
>
> ---- Debugging information ----****
>
> field               : rule-attribute****
>
> class               :
> org.drools.ide.common.client.modeldriven.brl.RuleModel****
>
> required-type       :
> org.drools.ide.common.client.modeldriven.brl.RuleModel****
>
> converter-type      :
> com.thoughtworks.xstream.converters.reflection.ReflectionC****
>
> onverter****
>
> path                : /rule/rule-attribute****
>
> version             : null****
>
> -------------------------------****
>
>         at
> com.thoughtworks.xstream.converters.reflection.AbstractReflectionConv****
>
> erter.determineType(AbstractReflectionConverter.java:449)****
>
>         at
> com.thoughtworks.xstream.converters.reflection.AbstractReflectionConv****
>
> erter.doUnmarshal(AbstractReflectionConverter.java:290)****
>
>         at
> com.thoughtworks.xstream.converters.reflection.AbstractReflectionConv****
>
> erter.unmarshal(AbstractReflectionConverter.java:230)****
>
>         at
> com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshall****
>
> er.java:72)****
>
>         at
> com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(A****
>
> bstractReferenceUnmarshaller.java:65)****
>
>         at
> com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnm****
>
> arshaller.java:66)****
>
>         at
> com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnm****
>
> arshaller.java:50)****
>
>         at
> com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller****
>
> .java:134)****
>
>         at
> com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarsh****
>
> al(AbstractTreeMarshallingStrategy.java:32)****
>
>         at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1035)**
> **
>
>         at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1019)**
> **
>
>         at com.thoughtworks.xstream.XStream.fromXML(XStream.java:895)****
>
>         at com.thoughtworks.xstream.XStream.fromXML(XStream.java:886)****
>
>         at
> org.drools.ide.common.server.util.BRXMLPersistence.unmarshal(BRXMLPer****
>
> sistence.java:191)****
>
>         at
> org.drools.guvnor.server.contenthandler.drools.BRLContentHandler.retr****
>
> ieveAssetContent(BRLContentHandler.java:41)****
>
>         at
> org.drools.guvnor.server.RepositoryAssetService.handlePackageItem(Rep****
>
> ositoryAssetService.java:132)****
>
>         at
> org.drools.guvnor.server.RepositoryAssetService.loadRuleAsset(Reposit****
>
> oryAssetService.java:118)****
>
>         at
> org.drools.guvnor.server.RepositoryAssetService$Proxy$_$$_WeldClientP****
>
> roxy.loadRuleAsset(RepositoryAssetService$Proxy$_$$_WeldClientProxy.java)*
> ***
>
>         at
> org.drools.guvnor.server.RepositoryServiceServlet.loadRuleAsset(Repos****
>
> itoryServiceServlet.java:403)****
>
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)****
>
>         at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.****
>
> java:39)****
>
>         at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces****
>
> sorImpl.java:25)****
>
>         at java.lang.reflect.Method.invoke(Method.java:597)****
>
>         at
> com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:5****
>
> 69)****
>
>         at
> com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(Remot****
>
> eServiceServlet.java:208)****
>
>         at
> com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(Remot****
>
> eServiceServlet.java:248)****
>
>         at
> com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(Ab****
>
> stractRemoteServiceServlet.java:62)****
>
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)***
> *
>
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)***
> *
>
>         at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl****
>
> icationFilterChain.java:290)****
>
>         at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF****
>
> ilterChain.java:206)****
>
>         at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV****
>
> alve.java:233)****
>
>         at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextV****
>
> alve.java:191)****
>
>         at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j****
>
> ava:127)****
>
>         at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j****
>
> ava:102)****
>
>         at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal****
>
> ve.java:109)****
>
>         at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav****
>
> a:293)****
>
>         at
> org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcesso****
>
> r.java:877)****
>
>         at
> org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.pr****
>
> ocess(Http11AprProtocol.java:594)****
>
>         at
> org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:16****
>
> 75)****
>
>         at java.lang.Thread.run(Thread.java:662)****
>
> ** **
>
> ** **
>
> I am able to re-produce the same error when I try to convert the BRL to
> DRL using BRDRLPersistence and BRXMLPersistence marshalling and
> unmarshalling.  I checked that the field ‘rule-attribute’ is indeed not
> present in org.drools.brms.client.modeldriven.brl.RuleModel.  when I look
> at the example brl file from the sample mortgage, they don’t have
> ‘rule-attribute’, and it’s not only that specific node, the whole set of
> node names are different. ****
>
> ** **
>
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>** **
>
> ** **
>
> public void convertDrlToBrl() throws IOException, DroolsParserException {*
> ***
>
> ** **
>
>         Resource fileResource = new
> ClassPathResource("Beneficiary_User_KYC_Level_3_Daily_Limit.drl");****
>
> ** **
>
>         DrlParser parser = new DrlParser();****
>
>         XmlDumper dumper = new XmlDumper();****
>
> ** **
>
>         Reader source = new InputStreamReader(new
> FileInputStream(fileResource.getFile()));****
>
>         PackageDescr pkg = parser.parse(source);****
>
> ** **
>
>         String xmlString = dumper.dump(pkg);****
>
> ** **
>
>         System.out.println(xmlString);****
>
>     }****
>
> ** **
>
> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<** **
>
> ** **
>
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>** **
>
> ** **
>
>     public void convertBrlToDrl() throws IOException {****
>
> ** **
>
>         Resource fileResource = new
> ClassPathResource("Beneficiary_User_KYC_Level_3_Daily_Limit_BRL.brl");****
>
> ** **
>
>         String fileAsString =
> FileUtils.readFileToString(fileResource.getFile());****
>
> ** **
>
>         BRDRLPersistence write = (BRDRLPersistence)
> BRDRLPersistence.getInstance();****
>
>         BRXMLPersistence read = (BRXMLPersistence)
> BRXMLPersistence.getInstance();****
>
> ** **
>
>         RuleModel ruleModel = read.unmarshal(fileAsString);****
>
>         String outputDRL = write.marshal(ruleModel);****
>
> ** **
>
>         System.out.println(outputDRL);****
>
> ** **
>
>     }****
>
> ** **
>
> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<** **
>
> ** **
>
> Generated xml file:****
>
> ** **
>
> ===============================================****
>
> ** **
>
> <rule name="Beneficiary_User_KYC_Level_3_Daily_Limit_BRL">****
>
> <rule-attribute name="dialect" value="mvel" />****
>
> ** **
>
> <lhs><pattern object-type="UserBean" >****
>
> <field-constraint field-name="kycLevel"> ****
>
> <literal-restriction evaluator="==" value="KYC_LEVEL_3" />****
>
> ** **
>
> </field-constraint>****
>
> <field-constraint field-name="userType"> ****
>
> <literal-restriction evaluator="==" value="BENEFICIARY" />****
>
> ** **
>
> </field-constraint>****
>
> ** **
>
> ** **
>
> </pattern>****
>
> ** **
>
> <pattern object-type="Activity" >****
>
> <field-constraint field-name="type"> ****
>
> <literal-restriction evaluator="!=" value="TRANSACTION.SEND" />****
>
> ** **
>
> </field-constraint>****
>
> ** **
>
> ** **
>
> </pattern>****
>
> ** **
>
> ** **
>
> </lhs><rhs>                       Limit fact0 = new Limit();****
>
>                                 fact0.setType( "DAILY_TRANSACTION_LIMIT" );
> ****
>
>                                 fact0.setValue( 10000 );****
>
>                                 fact0.setErrorMessage( "Maximum daily
> total amount of N10,000 exceeded for {0}." );****
>
>                                 insert(fact0 );****
>
> </rhs>****
>
> </rule>****
>
> ** **
>
> ================================================****
>
> ** **
>
> ** **
>
> Am I doing something wrong?  Is there a better way of converting the DRLs
> to BRLs?****
>
> ** **
>
> Thanks in advance!****
>
> *Anirban Bandyopadhyay*
>
> ------------------------------
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