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.geoserver.backuprestore.reader.CatalogFileReader.java

/**
 * Responsible for moving the cursor before the StartElement of the fragment root.
 * //from   w w  w.  j a v  a2s  . co  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.
 * 
 * @return <code>true</code> if next fragment was found, <code>false</code> otherwise.
 * 
 * @throws NonTransientResourceException if the cursor could not be moved. This will be treated as fatal and subsequent calls to read will return
 *         null.
 */
protected boolean moveCursorToNextFragment(XMLEventReader reader) {
    try {
        while (true) {
            while (reader.peek() != null && !reader.peek().isStartElement()) {
                reader.nextEvent();
            }
            if (reader.peek() == null) {
                return false;
            }
            QName startElementName = ((StartElement) reader.peek()).getName();
            if (isFragmentRootElementName(startElementName)) {
                return true;
            }
            reader.nextEvent();
        }
    } catch (XMLStreamException e) {
        return logValidationExceptions((T) null,
                new NonTransientResourceException("Error while reading from event reader", e));
    }
}

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From source file:org.mcisb.subliminal.SubliminalUtils.java

/**
 * /*from   www . j a  v  a 2  s . c  o m*/
 * @param elementName
 * @param is
 * @param onlyValues
 * @return Collection
 * @throws XMLStreamException
 * @throws UnsupportedEncodingException
 */
private static Collection<String> getElements(final String elementName, final InputStream is,
        final boolean onlyValues) throws XMLStreamException, UnsupportedEncodingException {
    final Collection<String> elements = new ArrayList<>();
    final ByteArrayOutputStream os = new ByteArrayOutputStream();
    final XMLEventReader reader = XMLInputFactory.newInstance()
            .createXMLEventReader(new InputStreamReader(is, Charset.defaultCharset().name()));
    final XMLEventWriter writer = XMLOutputFactory.newInstance()
            .createXMLEventWriter(new OutputStreamWriter(os, Charset.defaultCharset().name()));
    boolean read = false;
    String characters = null;

    while (reader.peek() != null) {
        final XMLEvent event = (XMLEvent) reader.next();

        switch (event.getEventType()) {
        case XMLStreamConstants.START_DOCUMENT:
        case XMLStreamConstants.END_DOCUMENT: {
            // Ignore.
            break;
        }
        case XMLStreamConstants.START_ELEMENT: {
            read = read || elementName.equals(event.asStartElement().getName().getLocalPart());

            if (read && !onlyValues) {
                writer.add(event);
            }

            break;
        }
        case XMLStreamConstants.ATTRIBUTE: {
            if (read && !onlyValues) {
                writer.add(event);
            }
            break;
        }
        case XMLStreamConstants.CHARACTERS: {
            if (read && !onlyValues) {
                writer.add(event);
            }
            characters = event.asCharacters().getData();
            break;
        }
        case XMLStreamConstants.END_ELEMENT: {
            if (read && !onlyValues) {
                writer.add(event);
            }
            if (elementName.equals(event.asEndElement().getName().getLocalPart())) {
                writer.flush();

                if (characters != null) {
                    elements.add(characters);
                }

                os.reset();
                read = false;
            }
            break;
        }
        default: {
            // Ignore
            break;
        }
        }
    }

    return elements;
}

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From source file:org.qi4j.valueserialization.stax.StaxValueDeserializer.java

@Override
protected Node readObjectTree(XMLEventReader input) throws Exception {
    XMLEvent peek = input.peek();
    if (peek.isStartElement() && "null".equals(peek.asStartElement().getName().getLocalPart())) {
        input.nextTag();// <null>
        input.nextTag();// </null>
        return null;
    }/*from   w  w w .j a va 2 s. co m*/
    String elementBody = readElementBody(input);
    Transformer transformer = transformerFactory.newTransformer();
    DOMResult domResult = new DOMResult();
    transformer.transform(new StreamSource(new StringReader(elementBody)), domResult);
    return ((Document) domResult.getNode()).getDocumentElement();

}

---

From source file:org.qi4j.valueserialization.stax.StaxValueDeserializer.java

private static String readElementBody(XMLEventReader input) throws XMLStreamException {
    StringWriter buf = new StringWriter(1024);
    int depth = 0;
    while (input.hasNext()) {
        // peek event
        XMLEvent xmlEvent = input.peek();
        if (xmlEvent.isStartElement()) {
            ++depth;/*from  w  w  w .j  ava  2 s  .  co  m*/
        } else if (xmlEvent.isEndElement()) {
            --depth;
            // reached END_ELEMENT tag?
            // break loop, leave event in stream
            if (depth < 0) {
                break;
            }
        }
        // consume event
        xmlEvent = input.nextEvent();
        // print out event
        xmlEvent.writeAsEncodedUnicode(buf);
    }
    return buf.getBuffer().toString();
}

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From source file:org.springframework.batch.item.xml.StaxEventItemReader.java

/**
 * Responsible for moving the cursor before the StartElement of the fragment root.
 * /*from  w  w  w.j  a v  a 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.
 * 
 * @return <code>true</code> if next fragment was found, <code>false</code> otherwise.
 * 
 * @throws NonTransientResourceException if the cursor could not be moved. This will be treated as fatal and
 * subsequent calls to read will return null.
 */
protected boolean moveCursorToNextFragment(XMLEventReader reader) throws NonTransientResourceException {
    try {
        while (true) {
            while (reader.peek() != null && !reader.peek().isStartElement()) {
                reader.nextEvent();
            }
            if (reader.peek() == null) {
                return false;
            }
            QName startElementName = ((StartElement) reader.peek()).getName();
            if (isFragmentRootElementName(startElementName)) {
                return true;
            }
            reader.nextEvent();

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

---

From source file:org.xmlsh.commands.internal.xml2json.java

private void readToEnd(XMLEventReader reader) throws XMLStreamException {
    while (reader.hasNext() && !reader.peek().isEndElement())
        reader.nextEvent();//from  ww w .j  a va  2 s .c o  m

    if (reader.hasNext())
        reader.nextEvent();

}

---

From source file:org.xmlsh.commands.internal.xml2json.java

private String readChars(XMLEventReader reader) throws XMLStreamException {

    StringBuffer sb = new StringBuffer();
    while (reader.hasNext() && reader.peek().isCharacters()) {
        Characters ch = reader.nextEvent().asCharacters();
        sb.append(ch.getData());// w  w  w  .  ja  v a2s .c o m

    }
    return sb.toString();

}

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