Example usage for org.w3c.dom Element getTagName

List of usage examples for org.w3c.dom Element getTagName

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Introduction

In this page you can find the example usage for org.w3c.dom Element getTagName.

Prototype

public String getTagName();

Source Link

Document

The name of the element.

Usage

From source file:com.netscape.cms.servlet.csadmin.ConfigurationUtils.java

public static int getSubsystemCount(String hostname, int https_admin_port, boolean https, String type)
        throws Exception {
    logger.debug("getSubsystemCount start");
    String c = getDomainXML(hostname, https_admin_port, true);
    if (c != null) {
        ByteArrayInputStream bis = new ByteArrayInputStream(c.getBytes());
        XMLObject obj = new XMLObject(bis);
        String containerName = type + "List";
        Node n = obj.getContainer(containerName);
        NodeList nlist = n.getChildNodes();
        String countS = "";
        for (int i = 0; i < nlist.getLength(); i++) {
            Element nn = (Element) nlist.item(i);
            String tagname = nn.getTagName();
            if (tagname.equals("SubsystemCount")) {
                NodeList nlist1 = nn.getChildNodes();
                Node nn1 = nlist1.item(0);
                countS = nn1.getNodeValue();
                break;
            }/*  w  ww.  j a  v a  2  s  .  c  o  m*/
        }
        logger.debug("getSubsystemCount: SubsystemCount=" + countS);
        int num = 0;

        if (countS != null && !countS.equals("")) {
            try {
                num = Integer.parseInt(countS);
            } catch (Exception ee) {
            }
        }

        return num;
    }
    return -1;
}

From source file:com.bluexml.xforms.controller.alfresco.AlfrescoController.java

public void executeBatch(AlfrescoTransaction alfrescoTransaction) throws ServletException {
    Map<String, String> parameters = new TreeMap<String, String>();
    parameters.put("datas", MappingAgent.marshalBatch(alfrescoTransaction));

    Map<String, String> ids = new HashMap<String, String>();

    Document result = requestDocumentFromAlfresco(alfrescoTransaction, parameters,
            MsgId.INT_WEBSCRIPT_OPCODE_BATCH);
    if (result == null) {
        throw new ServletException(MsgId.INT_MSG_ALFRESCO_SERVER_DOWN.getText());
    }/*from ww  w . jav  a  2 s .c  om*/
    Element idsElement = result.getDocumentElement();
    NodeList childNodes = idsElement.getChildNodes();
    for (int i = 0; i < childNodes.getLength(); i++) {
        Node idNode = childNodes.item(i);
        if (idNode instanceof Element) {
            Element idElement = (Element) idNode;
            String to = null;
            String from = null;
            NodeList idChildNodes = idElement.getChildNodes();
            for (int j = 0; j < idChildNodes.getLength(); j++) {
                Node node = idChildNodes.item(j);
                if (node instanceof Element) {
                    Element element = (Element) node;
                    if (StringUtils.equals(element.getTagName(), "from")) {
                        from = StringUtils.trim(element.getTextContent());
                    }
                    if (StringUtils.equals(element.getTagName(), "to")) {
                        to = StringUtils.trim(element.getTextContent());
                    }
                }
            }
            ids.put(from, to);
        }
    }

    alfrescoTransaction.setIds(ids);
}

From source file:com.bluexml.xforms.controller.alfresco.AlfrescoController.java

/**
 * Sets initial values for workflow fields from BlueXML properties (stored
 * in the repository) of/*from  w  w  w . j av  a 2 s .c o m*/
 * the workflow instance.
 * 
 * @param wkFormName
 *            the name of the workflow form to display
 * @param doc
 *            the XForms instance
 * @param instanceId
 *            the workflow instance Id (previously provided by Alfresco)
 * @return false if a lethal exception occurred. True if the normal end of
 *         the function was
 *         reached, which does not imply anything about the setting of
 *         initial values.
 */
public boolean workflowPatchInstance(AlfrescoTransaction transaction, String wkFormName, Document doc,
        String instanceId) {
    if (logger.isDebugEnabled()) {
        logger.debug("Patching workflow instance with Id:'" + instanceId + "', form name: " + wkFormName);
    }
    QName qname;
    String namespaceURI = null; // to be set once
    Map<QName, Serializable> properties = null; // to be set once

    if (StringUtils.trimToNull(instanceId) == null) {
        if (logger.isDebugEnabled()) {
            logger.debug("  No patching performed: the instanceId is null");
        }
        return true;
    }
    if (instanceId.equals("null")) {
        if (logger.isDebugEnabled()) {
            logger.debug("  No patching performed, invalid instanceId with string 'null'");
        }
        return true;
    }
    Element root = doc.getDocumentElement();
    Element formElt = DOMUtil.getChild(root, wkFormName);
    List<Element> allFields = DOMUtil.getAllChildren(formElt);

    // we need to fail silently so that the form is displayed even in the event of errors
    for (Element field : allFields) {
        String fieldUniqueName = field.getTagName();
        Serializable fieldValue = null;
        String localName = getWorkflowFieldAlfrescoName(wkFormName, fieldUniqueName);
        if (localName != null) {
            // build the QName
            if (namespaceURI == null) {
                String processName = workflowExtractProcessNameFromFormName(wkFormName);
                namespaceURI = getWorkflowNamespaceURI(processName);
            }
            qname = QName.createQName(namespaceURI, localName);

            // read the QName value from the collected properties of the workflow instance
            if (properties == null) {
                properties = workflowCollectInstanceProperties(transaction, instanceId);
                if (properties == null) {
                    return false; // there's no point in continuing without the properties
                }
            }
            try {
                // set the initial value
                fieldValue = properties.get(qname);
                if (fieldValue != null) {
                    field.setTextContent(fieldValue.toString());
                }
            } catch (NullPointerException e) {
                // we'll get this when displaying workflow forms while the webscript is down
                return false;
            }
        }
    }
    return true;
}

From source file:com.glaf.core.config.Configuration.java

private Resource loadResource(Properties properties, Resource wrapper, boolean quiet) {
    String name = UNKNOWN_RESOURCE;
    try {/* w w w  .ja  va 2  s .c  om*/
        Object resource = wrapper.getResource();
        name = wrapper.getName();

        DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
        // ignore all comments inside the xml file
        docBuilderFactory.setIgnoringComments(true);

        // allow includes in the xml file
        docBuilderFactory.setNamespaceAware(true);
        try {
            docBuilderFactory.setXIncludeAware(true);
        } catch (UnsupportedOperationException e) {
            LOG.error("Failed to set setXIncludeAware(true) for parser " + docBuilderFactory + ":" + e, e);
        }
        DocumentBuilder builder = docBuilderFactory.newDocumentBuilder();
        Document doc = null;
        Element root = null;
        boolean returnCachedProperties = false;

        if (resource instanceof URL) { // an URL resource
            doc = parse(builder, (URL) resource);
        } else if (resource instanceof String) { // a CLASSPATH resource
            URL url = getResource((String) resource);
            doc = parse(builder, url);
        } else if (resource instanceof InputStream) {
            doc = parse(builder, (InputStream) resource, null);
            returnCachedProperties = true;
        } else if (resource instanceof Properties) {
            overlay(properties, (Properties) resource);
        } else if (resource instanceof Element) {
            root = (Element) resource;
        }

        if (root == null) {
            if (doc == null) {
                if (quiet) {
                    return null;
                }
                throw new RuntimeException(resource + " not found");
            }
            root = doc.getDocumentElement();
        }
        Properties toAddTo = properties;
        if (returnCachedProperties) {
            toAddTo = new Properties();
        }
        if (!"configuration".equals(root.getTagName()))
            LOG.fatal("bad conf file: top-level element not <configuration>");
        NodeList props = root.getChildNodes();

        for (int i = 0; i < props.getLength(); i++) {
            Node propNode = props.item(i);
            if (!(propNode instanceof Element))
                continue;
            Element prop = (Element) propNode;
            if ("configuration".equals(prop.getTagName())) {
                loadResource(toAddTo, new Resource(prop, name), quiet);
                continue;
            }
            if (!"property".equals(prop.getTagName()))
                LOG.warn("bad conf file: element not <property>");
            NodeList fields = prop.getChildNodes();
            String attr = null;
            String value = null;
            boolean finalParameter = false;
            LinkedList<String> source = new LinkedList<String>();
            for (int j = 0; j < fields.getLength(); j++) {
                Node fieldNode = fields.item(j);
                if (!(fieldNode instanceof Element))
                    continue;
                Element field = (Element) fieldNode;
                if ("name".equals(field.getTagName()) && field.hasChildNodes())
                    attr = StringInterner.weakIntern(((Text) field.getFirstChild()).getData().trim());
                if ("value".equals(field.getTagName()) && field.hasChildNodes())
                    value = StringInterner.weakIntern(((Text) field.getFirstChild()).getData());
                if ("final".equals(field.getTagName()) && field.hasChildNodes())
                    finalParameter = "true".equals(((Text) field.getFirstChild()).getData());
                if ("source".equals(field.getTagName()) && field.hasChildNodes())
                    source.add(StringInterner.weakIntern(((Text) field.getFirstChild()).getData()));
            }
            source.add(name);

            // Ignore this parameter if it has already been marked as
            // 'final'
            if (attr != null) {
                loadProperty(toAddTo, name, attr, value, finalParameter,
                        source.toArray(new String[source.size()]));
            }
        }

        if (returnCachedProperties) {
            overlay(properties, toAddTo);
            return new Resource(toAddTo, name);
        }
        return null;
    } catch (IOException e) {
        LOG.fatal("error parsing conf " + name, e);
        throw new RuntimeException(e);
    } catch (DOMException e) {
        LOG.fatal("error parsing conf " + name, e);
        throw new RuntimeException(e);
    } catch (SAXException e) {
        LOG.fatal("error parsing conf " + name, e);
        throw new RuntimeException(e);
    } catch (ParserConfigurationException e) {
        LOG.fatal("error parsing conf " + name, e);
        throw new RuntimeException(e);
    }
}

From source file:com.photon.phresco.framework.rest.api.QualityService.java

private List<String> getScreenShot(String testAgainst, String resultFile, String rootModulePath,
        String subModule, String from) throws PhrescoException {
    List<String> imgSources = new ArrayList<String>();
    try {/* w w  w  .j a  va2s  .c  o  m*/
        String testDir = "";
        if (PERFORMACE.equals(from)) {
            testDir = FrameworkServiceUtil.getPerformanceTestDir(rootModulePath, subModule);
        } else {
            testDir = FrameworkServiceUtil.getLoadTestDir(rootModulePath, subModule);
        }

        ProjectInfo projectInfo = Utility.getProjectInfo(rootModulePath, subModule);
        File testFolderLocation = Utility.getTestFolderLocation(projectInfo, rootModulePath, subModule);
        StringBuilder sb = new StringBuilder(testFolderLocation.getPath());
        sb.append(testDir).append(File.separator).append(testAgainst);
        int lastDot = resultFile.lastIndexOf(".");
        String resultName = resultFile.substring(0, lastDot);

        File testPomFile = new File(sb.toString() + File.separator + POM_XML);
        PomProcessor pomProcessor = new PomProcessor(testPomFile);
        Plugin plugin = pomProcessor.getPlugin(COM_LAZERYCODE_JMETER, JMETER_MAVEN_PLUGIN);
        com.phresco.pom.model.Plugin.Configuration jmeterConfiguration = plugin.getConfiguration();
        List<Element> jmeterConfigs = jmeterConfiguration.getAny();
        for (Element element : jmeterConfigs) {
            if (PLUGIN_TYPES.equalsIgnoreCase(element.getTagName()) && element.hasChildNodes()) {
                NodeList types = element.getChildNodes();
                for (int i = 0; i < types.getLength(); i++) {
                    Node pluginType = types.item(i);
                    if (StringUtils.isNotEmpty(pluginType.getTextContent())) {
                        File imgFile = new File(sb.toString() + RESULTS_JMETER_GRAPHS + resultName + HYPHEN
                                + pluginType.getTextContent() + PNG);
                        if (imgFile.exists()) {
                            InputStream imageStream = new FileInputStream(imgFile);
                            String imgSrc = new String(Base64.encodeBase64(IOUtils.toByteArray(imageStream)));
                            imgSources.add(
                                    imgSrc + "#NAME_SEP#" + resultName + HYPHEN + pluginType.getTextContent());
                        }
                    }
                }
            }
        }

    } catch (Exception e) {
        throw new PhrescoException(e);
    }

    return imgSources;
}

From source file:co.cask.cdap.common.conf.Configuration.java

private void loadResource(Properties properties, Object name, boolean quiet) {
    try {//  w w w  .j a v a 2s  .  co  m
        DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
        //ignore all comments inside the xml file
        docBuilderFactory.setIgnoringComments(true);

        //allow includes in the xml file
        docBuilderFactory.setNamespaceAware(true);
        try {
            docBuilderFactory.setXIncludeAware(true);
        } catch (UnsupportedOperationException e) {
            LOG.error("Failed to set setXIncludeAware(true) for parser " + docBuilderFactory + ":" + e, e);
        }
        DocumentBuilder builder = docBuilderFactory.newDocumentBuilder();
        Document doc = null;
        Element root = null;

        if (name instanceof URL) { // an URL resource
            URL url = (URL) name;
            if (url != null) {
                if (!quiet) {
                    LOG.info("parsing " + url);
                }
                doc = builder.parse(url.toString());
            }
        } else if (name instanceof String) { // a CLASSPATH resource
            URL url = getResource((String) name);
            if (url != null) {
                if (!quiet) {
                    LOG.info("parsing " + url);
                }
                doc = builder.parse(url.toString());
            }
        } else if (name instanceof InputStream) {
            try {
                doc = builder.parse((InputStream) name);
            } finally {
                ((InputStream) name).close();
            }
        } else if (name instanceof Element) {
            root = (Element) name;
        }

        if (doc == null && root == null) {
            if (quiet) {
                return;
            }
            throw new RuntimeException(name + " not found");
        }

        if (root == null) {
            root = doc.getDocumentElement();
        }
        if (!"configuration".equals(root.getTagName())) {
            LOG.fatal("bad conf file: top-level element not <configuration>");
        }
        NodeList props = root.getChildNodes();
        for (int i = 0; i < props.getLength(); i++) {
            Node propNode = props.item(i);
            if (!(propNode instanceof Element)) {
                continue;
            }
            Element prop = (Element) propNode;
            if ("configuration".equals(prop.getTagName())) {
                loadResource(properties, prop, quiet);
                continue;
            }
            if (!"property".equals(prop.getTagName())) {
                LOG.warn("bad conf file: element not <property>");
            }
            NodeList fields = prop.getChildNodes();
            String attr = null;
            String value = null;
            boolean finalParameter = false;
            for (int j = 0; j < fields.getLength(); j++) {
                Node fieldNode = fields.item(j);
                if (!(fieldNode instanceof Element)) {
                    continue;
                }
                Element field = (Element) fieldNode;
                if ("name".equals(field.getTagName()) && field.hasChildNodes()) {
                    attr = ((Text) field.getFirstChild()).getData().trim();
                }
                if ("value".equals(field.getTagName()) && field.hasChildNodes()) {
                    value = ((Text) field.getFirstChild()).getData();
                }
                if ("final".equals(field.getTagName()) && field.hasChildNodes()) {
                    finalParameter = "true".equals(((Text) field.getFirstChild()).getData());
                }
            }

            // Ignore this parameter if it has already been marked as 'final'
            if (attr != null) {
                if (deprecatedKeyMap.containsKey(attr)) {
                    DeprecatedKeyInfo keyInfo = deprecatedKeyMap.get(attr);
                    keyInfo.accessed = false;
                    for (String key : keyInfo.newKeys) {
                        // update new keys with deprecated key's value
                        loadProperty(properties, name, key, value, finalParameter);
                    }
                } else {
                    loadProperty(properties, name, attr, value, finalParameter);
                }
            }
        }

    } catch (IOException e) {
        LOG.fatal("error parsing conf file: " + e);
        throw new RuntimeException(e);
    } catch (DOMException e) {
        LOG.fatal("error parsing conf file: " + e);
        throw new RuntimeException(e);
    } catch (SAXException e) {
        LOG.fatal("error parsing conf file: " + e);
        throw new RuntimeException(e);
    } catch (ParserConfigurationException e) {
        LOG.fatal("error parsing conf file: " + e);
        throw new RuntimeException(e);
    }
}

From source file:ucar.unidata.idv.flythrough.Flythrough.java

/**
 * _more_/*from   w  w w.  j a v a2s. c  om*/
 *
 * @param root _more_
 */
private void importKml(Element root) {
    try {
        List tourNodes = XmlUtil.findDescendants(root, KmlUtil.TAG_TOUR);
        if (tourNodes.size() == 0) {
            LogUtil.userMessage("Could not find any tours");
            return;
        }
        Element tourNode = (Element) tourNodes.get(0);
        List<FlythroughPoint> thePoints = new ArrayList<FlythroughPoint>();
        Element playListNode = XmlUtil.findChild(tourNode, KmlUtil.TAG_PLAYLIST);
        if (playListNode == null) {
            LogUtil.userMessage("Could not find playlist");
            return;
        }

        NodeList elements = XmlUtil.getElements(playListNode);
        for (int i = 0; i < elements.getLength(); i++) {
            Element child = (Element) elements.item(i);
            if (child.getTagName().equals(KmlUtil.TAG_FLYTO)) {
                Element cameraNode = XmlUtil.findChild(child, KmlUtil.TAG_CAMERA);
                /*        <Camera>
                      <longitude>170.157</longitude>
                      <latitude>-43.671</latitude>
                      <altitude>9700</altitude>
                      <heading>-6.333</heading>
                      <tilt>33.5</tilt>
                      </Camera>*/
                if (cameraNode == null) {
                    cameraNode = XmlUtil.findChild(child, KmlUtil.TAG_LOOKAT);
                }

                if (cameraNode == null) {
                    //                        System.err.println ("no camera:" + XmlUtil.toString(child));
                    continue;
                }
                FlythroughPoint pt = new FlythroughPoint(
                        makePoint(XmlUtil.getGrandChildText(cameraNode, KmlUtil.TAG_LATITUDE),
                                XmlUtil.getGrandChildText(cameraNode, KmlUtil.TAG_LONGITUDE),
                                XmlUtil.getGrandChildText(cameraNode, KmlUtil.TAG_ALTITUDE)));

                pt.setTiltX(-new Double(XmlUtil.getGrandChildText(cameraNode, KmlUtil.TAG_TILT, "0"))
                        .doubleValue());
                pt.setTiltY(new Double(XmlUtil.getGrandChildText(cameraNode, KmlUtil.TAG_HEADING, "0"))
                        .doubleValue());
                pt.setTiltZ(
                        new Double(XmlUtil.getGrandChildText(cameraNode, KmlUtil.TAG_ROLL, "0")).doubleValue());

                thePoints.add(pt);

            } else if (child.getTagName().equals(KmlUtil.TAG_WAIT)) {
            } else {
            }

        }

        flythrough(thePoints);
        doMakeContents(true);
        setAnimationTimes();
    } catch (Exception exc) {
        logException("Importing kml", exc);
    }
}

From source file:ucar.unidata.idv.flythrough.Flythrough.java

/**
 * _more_//from  ww w .  j  a  v  a 2s . c  om
 */
public void doImport() {
    try {
        String filename = FileManager.getReadFile(FileManager.FILTER_XML);
        if (filename == null) {
            return;
        }
        Element root = XmlUtil.getRoot(filename, getClass());
        if (root.getTagName().equals(KmlUtil.TAG_KML)) {
            importKml(root);
            return;
        }

        if (!root.getTagName().equals(TAG_FLYTHROUGH)) {
            throw new IllegalStateException("Unknown tag:" + root.getTagName());
        }
        for (int i = 0; i < tilt.length; i++) {
            tilt[i] = XmlUtil.getAttribute(root, ATTR_TILT[i], tilt[i]);
        }
        zoom = XmlUtil.getAttribute(root, ATTR_ZOOM, zoom);

        List<FlythroughPoint> thePoints = new ArrayList<FlythroughPoint>();
        NodeList elements = XmlUtil.getElements(root);
        for (int i = 0; i < elements.getLength(); i++) {
            Element child = (Element) elements.item(i);

            if (!child.getTagName().equals(TAG_POINT)) {
                throw new IllegalStateException("Unknown tag:" + child.getTagName());
            }
            FlythroughPoint pt = new FlythroughPoint();
            pt.setDescription(XmlUtil.getGrandChildText(child, TAG_DESCRIPTION));

            pt.setEarthLocation(makePoint(XmlUtil.getAttribute(child, ATTR_LAT, 0.0),
                    XmlUtil.getAttribute(child, ATTR_LON, 0.0), XmlUtil.getAttribute(child, ATTR_ALT, 0.0)));

            if (XmlUtil.hasAttribute(child, ATTR_DATE)) {
                pt.setDateTime(parseDate(XmlUtil.getAttribute(child, ATTR_DATE)));
            }
            pt.setTiltX(XmlUtil.getAttribute(child, ATTR_TILT[0], Double.NaN));
            pt.setTiltY(XmlUtil.getAttribute(child, ATTR_TILT[1], Double.NaN));
            pt.setTiltZ(XmlUtil.getAttribute(child, ATTR_TILT[2], Double.NaN));
            pt.setZoom(XmlUtil.getAttribute(child, ATTR_ZOOM, Double.NaN));
            String matrixS = XmlUtil.getAttribute(child, ATTR_MATRIX, (String) null);
            if (matrixS != null) {
                List<String> toks = (List<String>) StringUtil.split(matrixS, ",", true, true);
                double[] m = new double[toks.size()];
                for (int tokIdx = 0; tokIdx < m.length; tokIdx++) {
                    m[tokIdx] = new Double(toks.get(tokIdx)).doubleValue();
                }
                pt.setMatrix(m);
            }
            thePoints.add(pt);
        }
        flythrough(thePoints);
        doMakeContents(true);
        setAnimationTimes();
    } catch (Exception exc) {
        logException("Initializing flythrough", exc);
    }
}

From source file:marytts.tools.voiceimport.HTKLabeler.java

/**
 * /* w  w  w .j  ava2  s.c o  m*/
 * This computes a string of phonetic symbols out of an prompt allophones mary xml:
 * - standard phones are taken from "ph" attribute
 * @param tokens
 * @return
 */
private String collectTranscription(NodeList tokens) {

    // TODO: make delims argument
    // String Tokenizer devides transcriptions into syllables
    // syllable delimiters and stress symbols are retained
    String delims = "',-";

    // String storing the original transcription begins with a pause
    String orig = " pau ";

    // get original phone String
    for (int tNr = 0; tNr < tokens.getLength(); tNr++) {

        Element token = (Element) tokens.item(tNr);

        // only look at it if there is a sampa to change
        if (token.hasAttribute("ph")) {

            String sampa = token.getAttribute("ph");

            List<String> sylsAndDelims = new ArrayList<String>();
            StringTokenizer sTok = new StringTokenizer(sampa, delims, true);

            while (sTok.hasMoreElements()) {
                String currTok = sTok.nextToken();

                if (delims.indexOf(currTok) == -1) {
                    // current Token is no delimiter
                    for (Allophone ph : allophoneSet.splitIntoAllophones(currTok)) {
                        // orig += ph.name() + " ";
                        if (ph.name().trim().equals("_"))
                            continue;
                        orig += replaceTrickyPhones(ph.name().trim()) + " ";
                    } // ... for each phone
                } // ... if no delimiter
            } // ... while there are more tokens    
        }

        // TODO: simplify
        if (token.getTagName().equals("t")) {

            // if the following element is no boundary, insert a non-pause delimiter
            if (tNr == tokens.getLength() - 1
                    || !((Element) tokens.item(tNr + 1)).getTagName().equals("boundary")) {
                orig += "vssil "; // word boundary

            }

        } else if (token.getTagName().equals("boundary")) {

            orig += "ssil "; // phrase boundary

        } else {
            // should be "t" or "boundary" elements
            assert (false);
        }

    } // ... for each t-Element
    orig += "pau";
    return orig;
}

From source file:act.installer.pubchem.PubchemParser.java

/**
 * Incrementally parses a stream of XML events from a PubChem file, extracting the next available PC-Compound entry
 * as a Chemical object./*from   w w w  . j  a v  a2 s  . c  o  m*/
 * @param eventReader The xml event reader we are parsing the XML from
 * @return The constructed chemical
 * @throws XMLStreamException
 * @throws XPathExpressionException
 */
public Chemical extractNextChemicalFromXMLStream(XMLEventReader eventReader)
        throws XMLStreamException, JaxenException {
    Document bufferDoc = null;
    Element currentElement = null;
    StringBuilder textBuffer = null;
    /* With help from
     * http://stackoverflow.com/questions/7998733/loading-local-chunks-in-dom-while-parsing-a-large-xml-file-in-sax-java
     */
    while (eventReader.hasNext()) {
        XMLEvent event = eventReader.nextEvent();

        switch (event.getEventType()) {
        case XMLStreamConstants.START_ELEMENT:
            String eventName = event.asStartElement().getName().getLocalPart();
            if (COMPOUND_DOC_TAG.equals(eventName)) {
                // Create a new document if we've found the start of a compound object.
                bufferDoc = documentBuilder.newDocument();
                currentElement = bufferDoc.createElement(eventName);
                bufferDoc.appendChild(currentElement);
            } else if (currentElement != null) { // Wait until we've found a compound entry to start slurping up data.
                // Create a new child element and push down the current pointer when we find a new node.
                Element newElement = bufferDoc.createElement(eventName);
                currentElement.appendChild(newElement);
                currentElement = newElement;
            } // If we aren't in a PC-Compound tree, we just let the elements pass by.
            break;

        case XMLStreamConstants.CHARACTERS:
            if (currentElement == null) { // Ignore this event if we're not in a PC-Compound tree.
                continue;
            }

            Characters chars = event.asCharacters();
            // Ignore only whitespace strings, which just inflate the size of the DOM.  Text coalescing makes this safe.
            if (chars.isWhiteSpace()) {
                continue;
            }

            // Rely on the XMLEventStream to coalesce consecutive text events.
            Text textNode = bufferDoc.createTextNode(chars.getData());
            currentElement.appendChild(textNode);
            break;

        case XMLStreamConstants.END_ELEMENT:
            if (currentElement == null) { // Ignore this event if we're not in a PC-Compound tree.
                continue;
            }

            eventName = event.asEndElement().getName().getLocalPart();
            Node parentNode = currentElement.getParentNode();
            if (parentNode instanceof Element) {
                currentElement = (Element) parentNode;
            } else if (parentNode instanceof Document && eventName.equals(COMPOUND_DOC_TAG)) {
                // We're back at the top of the node stack!  Convert the buffered document into a Chemical.
                PubchemEntry entry = extractPCCompoundFeatures(bufferDoc);
                if (entry != null) {
                    return entry.asChemical();
                } else {
                    // Skip this entry if we can't process it correctly by resetting the world and continuing on.
                    bufferDoc = null;
                    currentElement = null;
                }
            } else {
                // This should not happen, but is here as a sanity check.
                throw new RuntimeException(String.format("Parent of XML element %s is of type %d, not Element",
                        currentElement.getTagName(), parentNode.getNodeType()));
            }
            break;

        // TODO: do we care about attributes or other XML structures?
        }
    }

    // Return null when we run out of chemicals, just like readLine().
    return null;
}