Example usage for javax.xml.stream.events XMLEvent asStartElement

List of usage examples for javax.xml.stream.events XMLEvent asStartElement

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Introduction

In this page you can find the example usage for javax.xml.stream.events XMLEvent asStartElement.

Prototype

public StartElement asStartElement();

Source Link

Document

Returns this event as a start element event, may result in a class cast exception if this event is not a start element.

Usage

From source file:org.apache.hadoop.hdfs.tools.offlineImageViewer.OfflineImageReconstructor.java

private void loadNodeChildrenHelper(Node parent, String expected, String terminators[]) throws IOException {
    XMLEvent ev = null;
    while (true) {
        try {// w ww. j a v  a2 s  . co  m
            ev = events.peek();
            switch (ev.getEventType()) {
            case XMLEvent.END_ELEMENT:
                if (terminators.length != 0) {
                    return;
                }
                events.nextEvent();
                return;
            case XMLEvent.START_ELEMENT:
                String key = ev.asStartElement().getName().getLocalPart();
                for (String terminator : terminators) {
                    if (terminator.equals(key)) {
                        return;
                    }
                }
                events.nextEvent();
                Node node = new Node();
                parent.addChild(key, node);
                loadNodeChildrenHelper(node, expected, new String[0]);
                break;
            case XMLEvent.CHARACTERS:
                String val = XMLUtils.unmangleXmlString(ev.asCharacters().getData(), true);
                parent.setVal(val);
                events.nextEvent();
                break;
            case XMLEvent.ATTRIBUTE:
                throw new IOException("Unexpected XML event " + ev);
            default:
                // Ignore other event types like comment, etc.
                if (LOG.isTraceEnabled()) {
                    LOG.trace("Skipping XMLEvent " + ev);
                }
                events.nextEvent();
                break;
            }
        } catch (XMLStreamException e) {
            throw new IOException("Expecting " + expected + ", but got XMLStreamException", e);
        }
    }
}

From source file:org.apache.hadoop.hdfs.tools.offlineImageViewer.OfflineImageReconstructor.java

/**
 * Processes the XML file back into an fsimage.
 *///from   ww  w . j a va  2s . c om
private void processXml() throws Exception {
    LOG.debug("Loading <fsimage>.");
    expectTag("fsimage", false);
    // Read the <version> tag.
    readVersion();
    // Write the HDFSIMG1 magic number which begins the fsimage file.
    out.write(FSImageUtil.MAGIC_HEADER);
    // Write a series of fsimage sections.
    sectionStartOffset = FSImageUtil.MAGIC_HEADER.length;
    final HashSet<String> unprocessedSections = new HashSet<>(sections.keySet());
    while (!unprocessedSections.isEmpty()) {
        XMLEvent ev = expectTag("[section header]", true);
        if (ev.getEventType() == XMLStreamConstants.END_ELEMENT) {
            if (ev.asEndElement().getName().getLocalPart().equals("fsimage")) {
                throw new IOException("FSImage XML ended prematurely, without " + "including section(s) "
                        + StringUtils.join(", ", unprocessedSections));
            }
            throw new IOException(
                    "Got unexpected tag end event for " + ev.asEndElement().getName().getLocalPart()
                            + " while looking " + "for section header tag.");
        } else if (ev.getEventType() != XMLStreamConstants.START_ELEMENT) {
            throw new IOException(
                    "Expected section header START_ELEMENT; " + "got event of type " + ev.getEventType());
        }
        String sectionName = ev.asStartElement().getName().getLocalPart();
        if (!unprocessedSections.contains(sectionName)) {
            throw new IOException("Unknown or duplicate section found for " + sectionName);
        }
        SectionProcessor sectionProcessor = sections.get(sectionName);
        if (sectionProcessor == null) {
            throw new IOException("Unknown FSImage section " + sectionName + ".  Valid section names are ["
                    + StringUtils.join(", ", sections.keySet()) + "]");
        }
        unprocessedSections.remove(sectionName);
        sectionProcessor.process();
    }

    // Write the StringTable section to disk.
    // This has to be done after the other sections, since some of them
    // add entries to the string table.
    writeStringTableSection();

    // Write the FileSummary section to disk.
    // This section is always last.
    long prevOffset = out.getCount();
    FileSummary fileSummary = fileSummaryBld.build();
    if (LOG.isDebugEnabled()) {
        LOG.debug("Writing FileSummary: {" + TextFormat.printToString(fileSummary) + "}");
    }
    // Even though the last 4 bytes of the file gives the FileSummary length,
    // we still write a varint first that also contains the length.
    fileSummary.writeDelimitedTo(out);

    // Write the length of the FileSummary section as a fixed-size big
    // endian 4-byte quantity.
    int summaryLen = Ints.checkedCast(out.getCount() - prevOffset);
    byte[] summaryLenBytes = new byte[4];
    ByteBuffer.wrap(summaryLenBytes).asIntBuffer().put(summaryLen);
    out.write(summaryLenBytes);
}

From source file:org.apache.hadoop.util.ConfTest.java

private static List<NodeInfo> parseConf(InputStream in) throws XMLStreamException {
    QName configuration = new QName("configuration");
    QName property = new QName("property");

    List<NodeInfo> nodes = new ArrayList<NodeInfo>();
    Stack<NodeInfo> parsed = new Stack<NodeInfo>();

    XMLInputFactory factory = XMLInputFactory.newInstance();
    XMLEventReader reader = factory.createXMLEventReader(in);

    while (reader.hasNext()) {
        XMLEvent event = reader.nextEvent();
        if (event.isStartElement()) {
            StartElement currentElement = event.asStartElement();
            NodeInfo currentNode = new NodeInfo(currentElement);
            if (parsed.isEmpty()) {
                if (!currentElement.getName().equals(configuration)) {
                    return null;
                }//  w  ww.  ja  v  a2 s .co m
            } else {
                NodeInfo parentNode = parsed.peek();
                QName parentName = parentNode.getStartElement().getName();
                if (parentName.equals(configuration)
                        && currentNode.getStartElement().getName().equals(property)) {
                    @SuppressWarnings("unchecked")
                    Iterator<Attribute> it = currentElement.getAttributes();
                    while (it.hasNext()) {
                        currentNode.addAttribute(it.next());
                    }
                } else if (parentName.equals(property)) {
                    parentNode.addElement(currentElement);
                }
            }
            parsed.push(currentNode);
        } else if (event.isEndElement()) {
            NodeInfo node = parsed.pop();
            if (parsed.size() == 1) {
                nodes.add(node);
            }
        } else if (event.isCharacters()) {
            if (2 < parsed.size()) {
                NodeInfo parentNode = parsed.pop();
                StartElement parentElement = parentNode.getStartElement();
                NodeInfo grandparentNode = parsed.peek();
                if (grandparentNode.getElement(parentElement) == null) {
                    grandparentNode.setElement(parentElement, event.asCharacters());
                }
                parsed.push(parentNode);
            }
        }
    }

    return nodes;
}

From source file:org.apache.hadoop.util.ConfTest.java

public static List<String> checkConf(InputStream in) {
    List<NodeInfo> nodes = null;
    List<String> errors = new ArrayList<String>();

    try {//w w w .  j  a  va  2  s  .c  om
        nodes = parseConf(in);
        if (nodes == null) {
            errors.add("bad conf file: top-level element not <configuration>");
        }
    } catch (XMLStreamException e) {
        errors.add("bad conf file: " + e.getMessage());
    }

    if (!errors.isEmpty()) {
        return errors;
    }

    Map<String, List<Integer>> duplicatedProperties = new HashMap<String, List<Integer>>();

    for (NodeInfo node : nodes) {
        StartElement element = node.getStartElement();
        int line = element.getLocation().getLineNumber();

        if (!element.getName().equals(new QName("property"))) {
            errors.add(String.format("Line %d: element not <property>", line));
            continue;
        }

        List<XMLEvent> events = node.getXMLEventsForQName(new QName("name"));
        if (events == null) {
            errors.add(String.format("Line %d: <property> has no <name>", line));
        } else {
            String v = null;
            for (XMLEvent event : events) {
                if (event.isAttribute()) {
                    v = ((Attribute) event).getValue();
                } else {
                    Characters c = node.getElement(event.asStartElement());
                    if (c != null) {
                        v = c.getData();
                    }
                }
                if (v == null || v.isEmpty()) {
                    errors.add(String.format("Line %d: <property> has an empty <name>", line));
                }
            }
            if (v != null && !v.isEmpty()) {
                List<Integer> lines = duplicatedProperties.get(v);
                if (lines == null) {
                    lines = new ArrayList<Integer>();
                    duplicatedProperties.put(v, lines);
                }
                lines.add(node.getStartElement().getLocation().getLineNumber());
            }
        }

        events = node.getXMLEventsForQName(new QName("value"));
        if (events == null) {
            errors.add(String.format("Line %d: <property> has no <value>", line));
        }

        for (QName qName : node.getDuplicatedQNames()) {
            if (!qName.equals(new QName("source"))) {
                errors.add(String.format("Line %d: <property> has duplicated <%s>s", line, qName));
            }
        }
    }

    for (Entry<String, List<Integer>> e : duplicatedProperties.entrySet()) {
        List<Integer> lines = e.getValue();
        if (1 < lines.size()) {
            errors.add(String.format("Line %s: duplicated <property>s for %s", StringUtils.join(", ", lines),
                    e.getKey()));
        }
    }

    return errors;
}

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

private Object fromPrimitive(final XMLEventReader reader, final StartElement start, final EdmTypeInfo typeInfo)
        throws XMLStreamException, EdmPrimitiveTypeException {

    Object value = null;//from  www  . ja va  2 s.  c om

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

        if (event.isStartElement() && typeInfo != null && typeInfo.getPrimitiveTypeKind().isGeospatial()) {
            final EdmPrimitiveTypeKind geoType = EdmPrimitiveTypeKind
                    .valueOfFQN(typeInfo.getFullQualifiedName().toString());
            value = geoDeserializer.deserialize(reader, event.asStartElement(), geoType);
        }

        if (event.isCharacters() && !event.asCharacters().isWhiteSpace()
                && (typeInfo == null || !typeInfo.getPrimitiveTypeKind().isGeospatial())) {
            final String stringValue = event.asCharacters().getData();
            if (typeInfo == null) {
                value = stringValue;
            } else {
                final EdmPrimitiveType primitiveType = (EdmPrimitiveType) typeInfo.getType();
                final Class<?> returnType = primitiveType.getDefaultType().isAssignableFrom(Calendar.class)
                        ? Timestamp.class
                        : primitiveType.getDefaultType();
                value = ((EdmPrimitiveType) typeInfo.getType()).valueOfString(stringValue, true, null,
                        Constants.DEFAULT_PRECISION, Constants.DEFAULT_SCALE, true, returnType);
            }
        }

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

    return value;
}

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

private Object fromComplexOrEnum(final XMLEventReader reader, final StartElement start)
        throws XMLStreamException, EdmPrimitiveTypeException {

    Object value = null;/*from  ww  w  .  j a va2  s  . c  o  m*/

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

        if (event.isStartElement()) {
            if (value == null) {
                value = new ComplexValue();
            }

            if (Constants.QNAME_ATOM_ELEM_LINK.equals(event.asStartElement().getName())) {
                final Link link = new Link();
                final Attribute rel = event.asStartElement()
                        .getAttributeByName(QName.valueOf(Constants.ATTR_REL));
                if (rel != null) {
                    link.setRel(rel.getValue());
                }
                final Attribute title = event.asStartElement()
                        .getAttributeByName(QName.valueOf(Constants.ATTR_TITLE));
                if (title != null) {
                    link.setTitle(title.getValue());
                }
                final Attribute href = event.asStartElement()
                        .getAttributeByName(QName.valueOf(Constants.ATTR_HREF));
                if (href != null) {
                    link.setHref(href.getValue());
                }
                final Attribute type = event.asStartElement()
                        .getAttributeByName(QName.valueOf(Constants.ATTR_TYPE));
                if (type != null) {
                    link.setType(type.getValue());
                }

                if (link.getRel().startsWith(Constants.NS_NAVIGATION_LINK_REL)) {

                    ((ComplexValue) value).getNavigationLinks().add(link);
                    inline(reader, event.asStartElement(), link);
                } else if (link.getRel().startsWith(Constants.NS_ASSOCIATION_LINK_REL)) {

                    ((Valuable) value).asComplex().getAssociationLinks().add(link);
                }
            } else {
                ((ComplexValue) value).getValue().add(property(reader, event.asStartElement()));
            }
        }

        if (event.isCharacters() && !event.asCharacters().isWhiteSpace()) {
            value = event.asCharacters().getData();
        }

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

    return value;
}

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

private void fromCollection(final Valuable valuable, final XMLEventReader reader, final StartElement start,
        final EdmTypeInfo typeInfo) throws XMLStreamException, EdmPrimitiveTypeException {

    List<Object> values = new ArrayList<Object>();
    ValueType valueType = ValueType.COLLECTION_PRIMITIVE;

    final EdmTypeInfo type = typeInfo == null ? null
            : new EdmTypeInfo.Builder().setTypeExpression(typeInfo.getFullQualifiedName().toString()).build();

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

        if (event.isStartElement()) {
            switch (guessPropertyType(reader, typeInfo)) {
            case COMPLEX:
                final Object complexValue = fromComplexOrEnum(reader, event.asStartElement());
                valueType = ValueType.COLLECTION_COMPLEX;
                values.add(complexValue);
                break;

            case ENUM:
                valueType = ValueType.COLLECTION_ENUM;
                values.add(fromComplexOrEnum(reader, event.asStartElement()));
                break;

            case PRIMITIVE:
                final Object value = fromPrimitive(reader, event.asStartElement(), type);
                valueType = value instanceof Geospatial ? ValueType.COLLECTION_GEOSPATIAL
                        : ValueType.COLLECTION_PRIMITIVE;
                values.add(value);/*from  w  w w . j  ava  2 s . co  m*/
                break;

            default:
                // do not add null or empty values
            }
        }

        if (event.isEndElement() && start.getName().equals(event.asEndElement().getName())) {
            foundEndProperty = true;
        }
    }
    valuable.setValue(valueType, values);
}

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

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

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

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

    return type;
}

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

private StartElement skipBeforeFirstStartElement(final XMLEventReader reader) throws XMLStreamException {
    StartElement startEvent = null;
    while (reader.hasNext() && startEvent == null) {
        final XMLEvent event = reader.nextEvent();
        if (event.isStartElement()) {
            startEvent = event.asStartElement();
        }//from   w  w w.ja v  a  2  s  .c  om
    }
    if (startEvent == null) {
        throw new IllegalArgumentException("Cannot find any XML start element");
    }

    return startEvent;
}

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

private void inline(final XMLEventReader reader, final StartElement start, final Link 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 = getStartElement(reader);
                if (inline != null) {
                    if (Constants.QNAME_ATOM_ELEM_ENTRY.equals(inline.getName())) {
                        link.setInlineEntity(entity(reader, inline));
                    }/*from ww  w.  j av a 2 s .c  o m*/
                    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;
        }
    }
}