I don't know for sure whether this problem can be solved. But sometime back I wrote a custom mediator to do XSLT transformations using the StAX support available in the Java TrAX API. It showed a fairly good performance improvement against the existing implementation too.
Solving the problem mentioned in this thread will be pretty hard. Perhaps we can relax the conditions a bit. We can wrap the output of the transformation in a SOAP envelope and put that back in the data handler. We will use any information in the original SOAP headers, but that won't be an issue for most practical scenarios. Thanks, Hiranya On Sat, Sep 15, 2012 at 9:23 AM, Andun Sameera <an...@wso2.com> wrote: > Hi Amila, > > On Sat, Sep 15, 2012 at 9:22 PM, Amila Suriarachchi <am...@wso2.com>wrote: > >> Does xslt engine supports xml stream level transformations? > > > Yes. But not 100% streams, but we can transform StreamSource object to > a StreamResult using the Transformer. > > >> After xslt transformations users may want to do further processing with >> the message. So in that case we can avoid building request Axiom object but >> may required to create the transformed Axiom object. >> > > Yes your argument is correct, sometimes we have to create the result > message. But I got in to trouble even before. In the present scenario, XSLT > mediator read some parameters from the request using AXIOM. It read > weather transformation is happening to SOAP body or SOAP envelop etc. Based > on those parameters after the transformation mediator reform the message. > You can fine that logic in > [1]<http://wso2.org/svn/browse/wso2/carbon/platform/branches/4.0.0/dependencies/synapse/2.1.0-wso2v7/modules/core/src/main/java/org/apache/synapse/mediators/transform/XSLTMediator.java?view=markup> > . > > But here I have no such parameters, I have only a input stream and > I transform it using the XSLT file. After transformation I have no clue > to reform the message. What I do is set the output stream to > the data-handler in binary relay dummy message. So some parts of the > original message get dropped and everything crashes here after. > > >> thanks, >> Amila. >> >> >> On Sat, Sep 15, 2012 at 4:16 PM, Andun Sameera <an...@wso2.com> wrote: >> >>> Hi All, >>> >>> My requirement is $Subject. Purpose of this is avoid using AXIOM to to >>> XSLT transformation. Our plan was to do all the transformation using Input, >>> Output Streams. javax.xml.transform.Transformer is used to do >>> the transformation using streams. I developed the mediator using >>> the following logic, >>> >>> >>> - In the Binary Relay We get the Message as a Data Handler in a >>> Dummy SOAP Message. From that we can get a Input Stream for the SOAP >>> message which needs to be transformed using XSLT. >>> - We can Get the input Stream for the XSLT file, which is in >>> registry or local. >>> - Using those two we can do the XSLT transformation. As a result we >>> get a stream for the transformed SOAP message. >>> - Finally I create a DataHandler using the stream and attached it to >>> the Relay's Dummy SOAP message replacing existing one. >>> >>> The output of the mediator follows this logic is given below. I used the >>> Sample >>> 8<http://wso2.org/project/esb/java/4.0.3/docs/samples/message_mediation_samples.html#Sample8>of >>> ESB. I replaced the XSLT mediator with my custom mediator in the Binary >>> Relay. >>> But there is a major problem here. Because of the logic we used the >>> original SOAP message, >>> >>> <soapenv:Envelope xmlns:soapenv=" >>> http://schemas.xmlsoap.org/soap/envelope/";><soapenv:Header xmlns:wsa=" >>> http://www.w3.org/2005/08/addressing";><wsa:To> >>> http://localhost:9000/services/SimpleStockQuoteService</wsa:To><wsa:MessageID>urn:uuid:0f7403b4-c5bc-4347-8921-562f2736a2ab</wsa:MessageID><wsa:Action>urn:getQuote</wsa:Action></soapenv:Header><soapenv:Body><m0:CheckPriceRequest >>> xmlns:m0="http://services.samples >>> "><m0:Code>IBM</m0:Code></m0:CheckPriceRequest></soapenv:Body></soapenv:Envelope> >>> >>> is now converted to. >>> >>> <m:getQuote xmlns:m="http://services.samples";> >>> <m:request> >>> <m:symbol>IBM</m:symbol> >>> </m:request> >>> </m:getQuote> >>> >>> At the end Binary Relay Formatter will read the DataHandler and above >>> SOAP message will be sent to the AXIS2 Server and It will crash, because >>> this is not a valid SOAP message. >>> This problem occurs because we are not using AXIOM anymore. In the >>> normal XSLT mediator it >>> uses org.apache.synapse.util.xpath.SourceXPathSupport class to find the >>> part of the message which transformed using XSLT. So it can replace >>> the transformed part of the original message. But here we cant use that >>> kind of a logic. Because we use only streams. We cant build OMElements or >>> etc. >>> >>> Need help to solve this problem. The custom mediator java files are >>> attached here. >>> >>> Thanks >>> AndunSLG >>> >>> References : >>> >>> [1] - >>> http://wso2.org/project/esb/java/4.0.3/docs/samples/message_mediation_samples.html#Sample8 >>> >>> >>> Console Output for the Custom Mediator : >>> >>> .....................Original SOAP Envelop.......................... >>> <?xml version='1.0' encoding='utf-8'?><soapenv:Envelope xmlns:soapenv=" >>> http://www.w3.org/2003/05/soap-envelope";><soapenv:Body><ns:binary >>> xmlns:ns="http://ws.apache.org/commons/ns/payload >>> ">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</ns:binary></soapenv:Body></soapenv:Envelope> >>> >>> ................................................................................ >>> >>> .....................Original SOAP Message........................ >>> <soapenv:Envelope xmlns:soapenv=" >>> http://schemas.xmlsoap.org/soap/envelope/";><soapenv:Header xmlns:wsa=" >>> http://www.w3.org/2005/08/addressing";><wsa:To> >>> http://localhost:9000/services/SimpleStockQuoteService</wsa:To><wsa:MessageID>urn:uuid:0f7403b4-c5bc-4347-8921-562f2736a2ab</wsa:MessageID><wsa:Action>urn:getQuote</wsa:Action></soapenv:Header><soapenv:Body><m0:CheckPriceRequest >>> xmlns:m0="http://services.samples >>> "><m0:Code>IBM</m0:Code></m0:CheckPriceRequest></soapenv:Body></soapenv:Envelope> >>> >>> ................................................................................ >>> >>> Transforming On Progress..... >>> >>> ...................Transformed SOAP Message................... >>> <m:getQuote xmlns:m="http://services.samples";> >>> <m:request> >>> <m:symbol>IBM</m:symbol> >>> </m:request> >>> </m:getQuote> >>> >>> .............................................................................. >>> >>> ...................Transformed SOAP Envelop.................. >>> <?xml version='1.0' encoding='utf-8'?><soapenv:Envelope xmlns:soapenv=" >>> http://www.w3.org/2003/05/soap-envelope";><soapenv:Body><ns:binary >>> xmlns:ns="http://ws.apache.org/commons/ns/payload >>> ">PG06Z2V0UXVvdGUgeG1sbnM6bT0iaHR0cDovL3NlcnZpY2VzLnNhbXBsZXMiPgogICA8bTpyZXF1ZXN0PgogICAgICA8bTpzeW1ib2w+SUJNPC9tOnN5bWJvbD4KICAgPC9tOnJlcXVlc3Q+CjwvbTpnZXRRdW90ZT4K</ns:binary></soapenv:Body></soapenv:Envelope> >>> >>> .............................................................................. >>> >>> >> >> >> -- >> *Amila Suriarachchi* >> >> Software Architect >> WSO2 Inc. ; http://wso2.com >> lean . enterprise . middleware >> >> phone : +94 71 3082805 >> >> > Any suggestions to overcome this problem ? > > Thanks > AndunSLG > > [1] > http://wso2.org/svn/browse/wso2/carbon/platform/branches/4.0.0/dependencies/synapse/2.1.0-wso2v7/modules/core/src/main/java/org/apache/synapse/mediators/transform/XSLTMediator.java?view=markup > > _______________________________________________ > Dev mailing list > Dev@wso2.org > http://wso2.org/cgi-bin/mailman/listinfo/dev > > -- Hiranya Jayathilaka Mayhem Lab/RACE Lab; Dept. of Computer Science, UCSB; http://cs.ucsb.edu E-mail: hira...@cs.ucsb.edu <hira...@wso2.com>; Mobile: +1 (805) 895-7443 Blog: http://techfeast-hiranya.blogspot.com
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