Example usage for javax.xml.stream XMLEventReader peek

Introduction

In this page you can find the example usage for javax.xml.stream XMLEventReader peek.

Prototype

public XMLEvent peek() throws XMLStreamException;

Source Link

Document

Check the next XMLEvent without reading it from the stream.

Usage

From source file:org.apache.olingo.commons.core.serialization.AtomDeserializer.java

private ODataPropertyType guessPropertyType(final XMLEventReader reader, final EdmTypeInfo typeInfo)
        throws XMLStreamException {

    XMLEvent child = null;/*  w ww. j a  v a  2 s  .  c o m*/
    while (reader.hasNext() && child == null) {
        final XMLEvent event = reader.peek();
        if (event.isCharacters() && event.asCharacters().isWhiteSpace()) {
            reader.nextEvent();
        } else {
            child = event;
        }
    }

    final ODataPropertyType type;
    if (child == null) {
        type = typeInfo == null || typeInfo.isPrimitiveType() ? ODataPropertyType.PRIMITIVE
                : ODataPropertyType.ENUM;
    } else {
        if (child.isStartElement()) {
            if (Constants.NS_GML.equals(child.asStartElement().getName().getNamespaceURI())) {
                type = ODataPropertyType.PRIMITIVE;
            } else if (elementQName.equals(child.asStartElement().getName())) {
                type = ODataPropertyType.COLLECTION;
            } else {
                type = ODataPropertyType.COMPLEX;
            }
        } else if (child.isCharacters()) {
            type = typeInfo == null || typeInfo.isPrimitiveType() ? ODataPropertyType.PRIMITIVE
                    : ODataPropertyType.ENUM;
        } else {
            type = ODataPropertyType.EMPTY;
        }
    }

    return type;
}

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From source file:org.apache.olingo.commons.core.serialization.AtomDeserializer.java

private void inline(final XMLEventReader reader, final StartElement start, final LinkImpl link)
        throws XMLStreamException, EdmPrimitiveTypeException {

    boolean foundEndElement = false;
    while (reader.hasNext() && !foundEndElement) {
        final XMLEvent event = reader.nextEvent();

        if (event.isStartElement()) {
            if (inlineQName.equals(event.asStartElement().getName())) {
                StartElement inline = null;
                while (reader.hasNext() && inline == null) {
                    final XMLEvent innerEvent = reader.peek();
                    if (innerEvent.isCharacters() && innerEvent.asCharacters().isWhiteSpace()) {
                        reader.nextEvent();
                    } else if (innerEvent.isStartElement()) {
                        inline = innerEvent.asStartElement();
                    }//from  w  w w  .ja  va  2s  .c o m
                }
                if (inline != null) {
                    if (Constants.QNAME_ATOM_ELEM_ENTRY.equals(inline.getName())) {
                        link.setInlineEntity(entity(reader, inline));
                    }
                    if (Constants.QNAME_ATOM_ELEM_FEED.equals(inline.getName())) {
                        link.setInlineEntitySet(entitySet(reader, inline));
                    }
                }
            } else if (annotationQName.equals(event.asStartElement().getName())) {
                link.getAnnotations().add(annotation(reader, event.asStartElement()));
            }
        }

        if (event.isEndElement() && start.getName().equals(event.asEndElement().getName())) {
            foundEndElement = true;
        }
    }
}

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From source file:org.codice.ddf.spatial.ogc.wfs.transformer.handlebars.HandlebarsWfsFeatureTransformer.java

private boolean processStartElement(XMLEventReader xmlEventReader, StartElement startElement,
        Map<String, String> namespaces, Map<String, String> contextMap, boolean featureTypeFound)
        throws XMLStreamException {
    mapNamespaces(startElement, namespaces);
    if (!featureTypeFound) {
        if (canHandleFeatureType(startElement)) {
            String id = getIdAttributeValue(startElement, namespaces,
                    getNamespaceAlias(GML_NAMESPACE, namespaces));
            contextMap.put(METACARD_ID, id);
            return true;
        }//from   w w w. j a va 2s.co  m
    } else {
        XMLEvent eventPeek = xmlEventReader.peek();
        if (eventPeek.isStartElement() && isGmlElement(eventPeek.asStartElement(), namespaces)) {
            readGmlData(xmlEventReader, startElement.getName().getLocalPart(), contextMap);
        }
    }
    return false;
}

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From source file:org.codice.ddf.spatial.ogc.wfs.transformer.handlebars.HandlebarsWfsFeatureTransformer.java

private void readGmlData(XMLEventReader xmlEventReader, String elementName, Map<String, String> contextMap)
        throws XMLStreamException {

    if (!xmlEventReader.peek().isStartElement()) {
        LOGGER.debug("Problem reading gml data for element: {}. Invalid xml element provided.", elementName);
        return;//from  ww w .  ja v  a2s . c o m
    }

    StringWriter stringWriter = new StringWriter();
    XMLEventWriter eventWriter = XML_OUTPUT_FACTORY.createXMLEventWriter(stringWriter);

    if (eventWriter == null) {
        LOGGER.debug("Problem reading gml data for element: {}. Event writer is null", elementName);
        return;
    }

    int count = 0;
    boolean addEvent = true;

    try {
        while (addEvent) {
            XMLEvent xmlEvent = xmlEventReader.nextEvent();

            // populate the start element with the namespaces
            if (xmlEvent.isStartElement()) {
                xmlEvent = addNamespacesToStartElement(xmlEvent.asStartElement());
                count++;
            } else if (xmlEvent.isEndElement()) {
                if (count == 0) {
                    addEvent = false;
                    eventWriter.flush();
                    LOGGER.debug("String writer: {}", stringWriter);
                    contextMap.put(elementName, stringWriter.toString());
                }
                count--;
            }

            if (addEvent) {
                eventWriter.add(xmlEvent);
            }
        }
    } finally {
        eventWriter.close();
    }
}

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From source file:org.dataconservancy.model.builder.WrappingEventReaderTest.java

@Test
public void testPeekWithDefaultEventReader() throws Exception {
    // The input XML is:
    // <File><doc> </doc></File>

    final XMLEventReader reader = readerFactory
            .createXMLEventReader(IOUtils.toInputStream(SINGLE_ELEMENT_DOC_WHITESPACE_1));

    // START_DOCUMENT
    assertEquals(START_DOCUMENT, reader.peek().getEventType());
    reader.nextEvent();//ww w  .j a v a  2  s .  c  o m

    commonPeekFileTest(reader);

    // END_DOCUMENT
    assertEquals(END_DOCUMENT, reader.peek().getEventType());

    commonEndDocumentTest(reader);
}

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From source file:org.dataconservancy.model.builder.WrappingEventReaderTest.java

@Test
public void testPeekWithWrapperEventReader() throws Exception {
    // The input XML is:
    // <File><doc> </doc></File>
    // But the wrapper should wrap it to:
    // <dcp xmlns="http://dataconservancy.org/schemas/dcm/1.0"><Files><File><doc> </doc></File></Files></dcp>

    final XMLEventReader reader = new WrappingEventReader(
            readerFactory.createXMLEventReader(IOUtils.toInputStream(SINGLE_ELEMENT_DOC_WHITESPACE_1)));

    // START_DOCUMENT
    assertEquals(START_DOCUMENT, reader.peek().getEventType());
    // idempotent
    assertEquals(START_DOCUMENT, reader.peek().getEventType());
    assertEquals(START_DOCUMENT, reader.nextEvent().getEventType());

    // <dcp>
    assertEquals(START_ELEMENT, reader.peek().getEventType());
    // idempotent
    assertEquals(START_ELEMENT, reader.peek().getEventType());
    assertEquals(START_ELEMENT, reader.nextEvent().getEventType());

    // <Files>
    assertEquals(START_ELEMENT, reader.peek().getEventType());
    // idempotent
    assertEquals(START_ELEMENT, reader.peek().getEventType());
    assertEquals(START_ELEMENT, reader.nextEvent().getEventType());

    commonPeekFileTest(reader);/*from  w w w . j  av a  2 s .co m*/

    // </Files>
    assertEquals(END_ELEMENT, reader.peek().getEventType());
    // idempotent
    assertEquals(END_ELEMENT, reader.peek().getEventType());
    assertEquals(END_ELEMENT, reader.nextEvent().getEventType());

    // </dcp>
    assertEquals(END_ELEMENT, reader.peek().getEventType());
    // idempotent
    assertEquals(END_ELEMENT, reader.peek().getEventType());
    assertEquals(END_ELEMENT, reader.nextEvent().getEventType());

    // END_DOCUMENT
    assertEquals(END_DOCUMENT, reader.peek().getEventType());
    // idempotent
    assertEquals(END_DOCUMENT, reader.peek().getEventType());

    commonEndDocumentTest(reader);
}

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From source file:org.dataconservancy.model.builder.WrappingEventReaderTest.java

private void commonPeekFileTest(XMLEventReader reader) throws XMLStreamException {
    // The input XML is:
    // <File><doc> </doc></File>

    // <File>
    XMLEvent peekEvent = reader.peek();
    assertEquals(START_ELEMENT, peekEvent.getEventType());
    assertEquals(E_FILE, peekEvent.asStartElement().getName().getLocalPart());
    // idempotent
    assertEquals(peekEvent, reader.peek());
    XMLEvent actualEvent = reader.nextEvent();
    assertEquals(peekEvent, actualEvent);

    // <doc>
    peekEvent = reader.peek();//w w w  .  j av a 2  s. c  o  m
    assertEquals(START_ELEMENT, peekEvent.getEventType());
    assertEquals("doc", peekEvent.asStartElement().getName().getLocalPart());
    // idempotent
    assertEquals(peekEvent, reader.peek());
    actualEvent = reader.nextEvent();
    assertEquals(peekEvent, actualEvent);

    peekEvent = reader.peek();
    assertEquals(CHARACTERS, peekEvent.getEventType());
    // idempotent
    assertEquals(peekEvent, reader.peek());
    actualEvent = reader.nextEvent();
    assertEquals(peekEvent, actualEvent);

    // </doc>
    peekEvent = reader.peek();
    assertEquals(END_ELEMENT, peekEvent.getEventType());
    assertEquals("doc", peekEvent.asEndElement().getName().getLocalPart());
    // idempotent
    assertEquals(peekEvent, reader.peek());
    actualEvent = reader.nextEvent();
    assertEquals(peekEvent, actualEvent);

    // </File>
    peekEvent = reader.peek();
    assertEquals(END_ELEMENT, peekEvent.getEventType());
    assertEquals(E_FILE, peekEvent.asEndElement().getName().getLocalPart());
    // idempotent
    assertEquals(peekEvent, reader.peek());
    actualEvent = reader.nextEvent();
    // fails, bc we are preserving namespaces? assertEquals(peekEvent, actualEvent);
    // do this instead
    assertEquals(peekEvent.asEndElement().getName().getLocalPart(),
            actualEvent.asEndElement().getName().getLocalPart());
}

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From source file:org.dkpro.core.io.xces.XcesBasicXmlReader.java

@Override
public void getNext(JCas aJCas) throws IOException, CollectionException {

    Resource res = nextFile();//from  ww  w . j a  va  2 s .  c o  m
    initCas(aJCas, res);

    InputStream is = null;

    try {
        is = CompressionUtils.getInputStream(res.getLocation(), res.getInputStream());
        XMLInputFactory xmlInputFactory = XMLInputFactory.newInstance();
        XMLEventReader xmlEventReaderBasic = xmlInputFactory.createXMLEventReader(is);

        //JAXB context for XCES body with basic type
        JAXBContext contextBasic = JAXBContext.newInstance(XcesBodyBasic.class);
        Unmarshaller unmarshallerBasic = contextBasic.createUnmarshaller();

        unmarshallerBasic.setEventHandler(new ValidationEventHandler() {
            public boolean handleEvent(ValidationEvent event) {
                throw new RuntimeException(event.getMessage(), event.getLinkedException());
            }
        });

        JCasBuilder jb = new JCasBuilder(aJCas);

        XMLEvent eBasic = null;
        while ((eBasic = xmlEventReaderBasic.peek()) != null) {
            if (isStartElement(eBasic, "body")) {
                try {
                    XcesBodyBasic parasBasic = (XcesBodyBasic) unmarshallerBasic
                            .unmarshal(xmlEventReaderBasic, XcesBodyBasic.class).getValue();
                    readPara(jb, parasBasic);
                } catch (RuntimeException ex) {
                    getLogger().warn("Input is not in basic xces format.");
                }
            } else {
                xmlEventReaderBasic.next();
            }

        }
        jb.close();

    } catch (XMLStreamException ex1) {
        throw new IOException(ex1);
    } catch (JAXBException e1) {
        throw new IOException(e1);
    } finally {
        closeQuietly(is);
    }

}

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From source file:org.dkpro.core.io.xces.XcesXmlReader.java

@Override
public void getNext(JCas aJCas) throws IOException, CollectionException {

    Resource res = nextFile();/*  www  .j  a  v a  2 s  . c  o  m*/
    initCas(aJCas, res);

    InputStream is = null;

    try {
        is = CompressionUtils.getInputStream(res.getLocation(), res.getInputStream());

        XMLInputFactory xmlInputFactory = XMLInputFactory.newInstance();
        XMLEventReader xmlEventReader = xmlInputFactory.createXMLEventReader(is);

        JAXBContext context = JAXBContext.newInstance(XcesBody.class);
        Unmarshaller unmarshaller = context.createUnmarshaller();

        unmarshaller.setEventHandler(new ValidationEventHandler() {
            public boolean handleEvent(ValidationEvent event) {
                throw new RuntimeException(event.getMessage(), event.getLinkedException());
            }
        });

        JCasBuilder jb = new JCasBuilder(aJCas);

        XMLEvent e = null;
        while ((e = xmlEventReader.peek()) != null) {

            if (isStartElement(e, "body")) {
                try {
                    XcesBody paras = (XcesBody) unmarshaller.unmarshal(xmlEventReader, XcesBody.class)
                            .getValue();
                    readPara(jb, paras);
                } catch (RuntimeException ex) {
                    System.out.println("Unable to parse XCES format: " + ex);
                }
            } else {
                xmlEventReader.next();
            }

        }
        jb.close();

    } catch (XMLStreamException ex1) {
        throw new IOException(ex1);
    } catch (JAXBException e1) {
        throw new IOException(e1);
    } finally {
        closeQuietly(is);
    }

}

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From source file:org.emonocot.job.io.StaxEventItemReader.java

/**
 * Responsible for moving the cursor before the StartElement of the fragment
 * root.//from w ww .  java  2 s .  c o m
 *
 * This implementation simply looks for the next corresponding element, it
 * does not care about element nesting. You will need to override this
 * method to correctly handle composite fragments.
 * @param xmlEventReader Set the XML event reader
 * @return <code>true</code> if next fragment was found, <code>false</code>
 *         otherwise.
 */
protected final boolean moveCursorToNextFragment(final XMLEventReader xmlEventReader) {
    try {
        while (true) {
            while (xmlEventReader.peek() != null && !xmlEventReader.peek().isStartElement()) {
                xmlEventReader.nextEvent();
            }
            if (xmlEventReader.peek() == null) {
                return false;
            }
            QName startElementName = ((StartElement) xmlEventReader.peek()).getName();
            if (startElementName.getLocalPart().equals(fragmentRootElementName)) {
                if (fragmentRootElementNameSpace == null
                        || startElementName.getNamespaceURI().equals(fragmentRootElementNameSpace)) {
                    return true;
                }
            }
            xmlEventReader.nextEvent();

        }
    } catch (XMLStreamException e) {
        throw new DataAccessResourceFailureException("Error while reading from event reader", e);
    }
}

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