Problem with XQJ-Implementation (method XQResultSequence.getSequenceAsStream)

> Hi > > I am experiencing the BaseX API XQJ and I compare to other XQJ NXD and I > find the following problem. > > Suppose we have the next XML file in database "test": > > <?xml version="1.0" encoding="ISO-8859-1"?> > <bookstore param="hao"> > <book> > <title>Book01</title> > </book> > <book> > <title>Book02</title> > </book> > </bookstore> > > If I execute: > > XQDataSource xqs = ... > XQConnection conn = xqs.getConnection(); > XQExpression xqe = conn.createExpression(); > String cad= "collection('test')//title"; > > XQResultSequence xqrs = xqe.executeQuery(cad); > XMLStreamReader result = xqrs.getSequenceAsStream(); > System.out.println("Iteration on XMLStreamReader..."); > for(; result.hasNext(); result.next()) > System.out.println(getEventString(result)); > > xqrs = xqe.executeQuery(cad); > System.out.println("Using a Transformer..."); > Source resultXML = new StAXSource(xqrs.getSequenceAsStream()); > StreamResult resultSR = new StreamResult(System.out); > TransformerFactory factory = TransformerFactory.newInstance(); > Transformer tr = factory.newTransformer(); > tr.setOutputProperty(OutputKeys.INDENT, "yes"); > tr.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no"); > tr.setOutputProperty("{http://xml.apache.org/xslt}indent-amount","2"); > tr.transform(resultXML, resultSR); > > where > static String getEventString(final XMLStreamReader reader) { > switch(reader.getEventType()) { > case XMLStreamConstants.START_ELEMENT: > return "START_ELEMENT:\t\"" + reader.getLocalName() + "\""; > case XMLStreamConstants.END_ELEMENT: > return "END_ELEMENT:\t\"" + reader.getLocalName() + "\""; > case XMLStreamConstants.START_DOCUMENT: > return "START_DOCUMENT"; > case XMLStreamConstants.END_DOCUMENT: > return "END_DOCUMENT"; > case XMLStreamConstants.CHARACTERS: > return "CHARACTERS:\t\"" + reader.getText() + "\""; > } > return ""; > } > > I get: > > Iteration on XMLStreamReader... > START_ELEMENT: "title" > CHARACTERS: "Book01" > END_ELEMENT: "title" > END_DOCUMENT > START_ELEMENT: "title" > CHARACTERS: "Book02" > END_ELEMENT: "title" > END_DOCUMENT > Using a Transformer... > <?xml version="1.0" encoding="UTF-8"?> > <title>Book01</title> > > It's not good! > > When I use a Transformer I should get something similar to: > <?xml version="1.0" encoding="UTF-8"?> > <result> > <title>Book01</title> > <title>Book02</title> > <result> > > That is, if result sequence length is greater than 1, getSequenceAsStream > should wrap the sequence in a containing result element, so to not break > JAXP Transformers and XMLStreamReader events. > > Is there any solution in BaseX ? > > Thanks a lot! > > > Isidre Guixà

> Hi Isidre, > > as our XQJ implementation will soon be replaced by a new version of > Charles Foster (who also did the versions for eXist, Sedna and > MarkLogic), we won't put any more effort into the existing code. The > new version will also be based on the client/server architecture of > BaseX. > > Hope this helps, > Christian > ___________________________ > > 2012/4/3 Isidre Guixà <iguixa at xtec.cat>: >> Hi >> >> I am experiencing the BaseX API XQJ and I compare to other XQJ NXD and I >> find the following problem. >> >> Suppose we have the next XML file in database "test": >> >> <?xml version="1.0" encoding="ISO-8859-1"?> >> <bookstore param="hao"> >> <book> >> <title>Book01</title> >> </book> >> <book> >> <title>Book02</title> >> </book> >> </bookstore> >> >> If I execute: >> >> XQDataSource xqs = ... >> XQConnection conn = xqs.getConnection(); >> XQExpression xqe = conn.createExpression(); >> String cad= "collection('test')//title"; >> >> XQResultSequence xqrs = xqe.executeQuery(cad); >> XMLStreamReader result = xqrs.getSequenceAsStream(); >> System.out.println("Iteration on XMLStreamReader..."); >> for(; result.hasNext(); result.next()) >> System.out.println(getEventString(result)); >> >> xqrs = xqe.executeQuery(cad); >> System.out.println("Using a Transformer..."); >> Source resultXML = new StAXSource(xqrs.getSequenceAsStream()); >> StreamResult resultSR = new StreamResult(System.out); >> TransformerFactory factory = TransformerFactory.newInstance(); >> Transformer tr = factory.newTransformer(); >> tr.setOutputProperty(OutputKeys.INDENT, "yes"); >> tr.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no"); >> >> tr.setOutputProperty("{http://xml.apache.org/xslt}indent-amount","2"); >> tr.transform(resultXML, resultSR); >> >> where >> static String getEventString(final XMLStreamReader reader) { >> switch(reader.getEventType()) { >> case XMLStreamConstants.START_ELEMENT: >> return "START_ELEMENT:\t\"" + reader.getLocalName() + "\""; >> case XMLStreamConstants.END_ELEMENT: >> return "END_ELEMENT:\t\"" + reader.getLocalName() + "\""; >> case XMLStreamConstants.START_DOCUMENT: >> return "START_DOCUMENT"; >> case XMLStreamConstants.END_DOCUMENT: >> return "END_DOCUMENT"; >> case XMLStreamConstants.CHARACTERS: >> return "CHARACTERS:\t\"" + reader.getText() + "\""; >> } >> return ""; >> } >> >> I get: >> >> Iteration on XMLStreamReader... >> START_ELEMENT: "title" >> CHARACTERS: "Book01" >> END_ELEMENT: "title" >> END_DOCUMENT >> START_ELEMENT: "title" >> CHARACTERS: "Book02" >> END_ELEMENT: "title" >> END_DOCUMENT >> Using a Transformer... >> <?xml version="1.0" encoding="UTF-8"?> >> <title>Book01</title> >> >> It's not good! >> >> When I use a Transformer I should get something similar to: >> <?xml version="1.0" encoding="UTF-8"?> >> <result> >> <title>Book01</title> >> <title>Book02</title> >> <result> >> >> That is, if result sequence length is greater than 1, >> getSequenceAsStream >> should wrap the sequence in a containing result element, so to not break >> JAXP Transformers and XMLStreamReader events. >> >> Is there any solution in BaseX ? >> >> Thanks a lot! >> >> >> Isidre Guixà >