Created
July 29, 2016 14:44
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Async Parsing XML using Aalto-XML
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| import javax.xml.stream.*; | |
| import javax.xml.stream.events.*; | |
| import com.fasterxml.aalto.*; | |
| import com.fasterxml.aalto.stax.*; | |
| import io.vertx.core.buffer.*; | |
| public class XMLParser { | |
| private AsyncXMLInputFactory xmlInputFactory = new InputFactoryImpl(); | |
| private AsyncXMLStreamReader<AsyncByteArrayFeeder> streamReader = xmlInputFactory.createAsyncForByteArray(); | |
| public rx.Observable<XMLStreamEvent> parse(Buffer data) { | |
| byte[] bytes = data.getBytes(); | |
| final int bufSize = data.length(); | |
| try { | |
| streamReader.getInputFeeder().feedInput(bytes, 0, bufSize); | |
| } catch (XMLStreamException e) { | |
| return rx.Observable.error(e); | |
| } | |
| // consume all data | |
| return rx.Observable.create(subscriber -> { | |
| try { | |
| while (streamReader.hasNext()) { | |
| // read next token | |
| int event=-1; | |
| try { | |
| event = streamReader.next(); | |
| } catch (Exception e) { | |
| subscriber.onError(e); | |
| break; | |
| } | |
| if (event == AsyncXMLStreamReader.EVENT_INCOMPLETE) { | |
| // create stream event | |
| XMLStreamEvent e = new XMLStreamEvent(event, streamReader); | |
| subscriber.onNext(e); | |
| // wait for more input | |
| break; | |
| } | |
| if(event == XMLEvent.END_ELEMENT && streamReader.getLocalName().equals("TutorResult")) { | |
| streamReader.getInputFeeder().endOfInput(); | |
| // Prepare for next xml file. | |
| } | |
| // create stream event | |
| XMLStreamEvent e = new XMLStreamEvent(event, streamReader); | |
| subscriber.onNext(e); | |
| if(event == XMLEvent.END_DOCUMENT) { | |
| streamReader = xmlInputFactory.createAsyncForByteArray(); | |
| } | |
| } | |
| } catch (XMLStreamException e) { | |
| // TODO Auto-generated catch block | |
| e.printStackTrace(); | |
| } | |
| }); | |
| } | |
| } |
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