Example usage for javax.xml.xpath XPathConstants STRING

List of usage examples for javax.xml.xpath XPathConstants STRING

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QName STRING

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Document

The XPath 1.0 string data type.

Maps to Java String .

Usage

From source file:org.opencastproject.remotetest.server.CaptureAdminRestEndpointTest.java

@Test
public void testGetAgents() throws Exception {
    String endpoint = "/capture-admin/agents";
    HttpGet get = new HttpGet(BASE_URL + endpoint + ".xml");
    String xmlResponse = EntityUtils.toString(httpClient.execute(get).getEntity());
    Main.returnClient(httpClient);/*w ww  .j av  a2  s . c  om*/

    // parse the xml and extract the running clients names
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();
    Document doc = builder.parse(IOUtils.toInputStream(xmlResponse, "UTF-8"));
    XPath xPath = XPathFactory.newInstance().newXPath();
    NodeList agents = (NodeList) xPath.compile("//*[local-name() = 'agent']").evaluate(doc,
            XPathConstants.NODESET);

    // validate the REST endpoint for each agent state is functional
    for (int i = 0; i < agents.getLength(); i++) {
        try {
            httpClient = Main.getClient();
            String agentName = (String) xPath.evaluate("*[local-name() = 'name']/text()", agents.item(i),
                    XPathConstants.STRING);
            HttpGet agentGet = new HttpGet(BASE_URL + endpoint + "/" + agentName + ".xml");
            int agentResponse = httpClient.execute(agentGet).getStatusLine().getStatusCode();
            assertEquals(HttpStatus.SC_OK, agentResponse);
        } finally {
            Main.returnClient(httpClient);
        }
    }
}

From source file:com.thed.launcher.EggplantZBotScriptLauncher.java

@Override
public void testcaseExecutionResult() {
    String scriptPath = LauncherUtils.getFilePathFromCommand(currentTestcaseExecution.getScriptPath());
    logger.info("Script Path is " + scriptPath);
    File scriptFile = new File(scriptPath);
    String scriptName = scriptFile.getName().split("\\.")[0];
    logger.info("Script Name is " + scriptName);
    File resultsFolder = new File(
            scriptFile.getParentFile().getParentFile().getAbsolutePath() + File.separator + "Results");
    File statisticalFile = resultsFolder.listFiles(new FilenameFilter() {
        @Override/*w ww  .  j  a  v a2  s.  c  o m*/
        public boolean accept(File file, String s) {
            return StringUtils.endsWith(s, "Statistics.xml");
        }
    })[0];
    try {
        XPath xpath = XPathFactory.newInstance().newXPath();
        Document statisticalDoc = getDoc(statisticalFile);
        String result = xpath.compile("/statistics/script[@name='" + scriptName + "']/LastStatus/text()")
                .evaluate(statisticalDoc, XPathConstants.STRING).toString();
        logger.info("Result is " + result);
        String comments;
        if (StringUtils.equalsIgnoreCase(result, "Success")) {
            logger.info("Test success detected");
            status = currentTestcaseExecution.getTcId() + ": " + currentTestcaseExecution.getScriptId()
                    + " STATUS: Script Successfully Executed";
            currentTcExecutionResult = new Integer(1);
            comments = " Successfully executed on " + agent.getAgentHostAndIp();
        } else {
            logger.info("Test failure detected, getting error message");
            status = currentTestcaseExecution.getTcId() + ": " + currentTestcaseExecution.getScriptId()
                    + " STATUS: Script Successfully Executed";
            currentTcExecutionResult = new Integer(2);
            comments = " Error in test: ";
            String lastRunDateString = xpath
                    .compile("/statistics/script[@name='" + scriptName + "']/LastRun/text()")
                    .evaluate(statisticalDoc);
            //Date lastRunDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss Z").parse(lastRunDateString);
            File historyFile = new File(resultsFolder.getAbsolutePath() + File.separator + scriptName
                    + File.separator + "RunHistory.xml");
            Document historyDoc = getDoc(historyFile);
            //xpath = XPathFactory.newInstance().newXPath();
            String xpathExpr = "/runHistory[@script='" + scriptName + "']/run[contains(RunDate, '"
                    + StringUtils.substringBeforeLast(lastRunDateString, " ") + "')]/ErrorMessage/text()";
            logger.info("Using xPath to find errorMessage " + xpathExpr);
            comments += xpath.compile(xpathExpr).evaluate(historyDoc, XPathConstants.STRING);
            logger.info("Sending comments: " + comments);
        }
        if (currentTcExecutionResult != null) {
            ScriptUtil.updateTestcaseExecutionResult(url, currentTestcaseExecution, currentTcExecutionResult,
                    comments);
        }
    } catch (Exception e) {
        logger.log(Level.SEVERE, "Error in reading process steams \n", e);
    }
}

From source file:de.egore911.versioning.deployer.performer.PerformExtraction.java

public void perform(Node serverDeploymentsDeploymentNode) throws XPathExpressionException {
    NodeList extractionOperations = (NodeList) extractXpath.evaluate(serverDeploymentsDeploymentNode,
            XPathConstants.NODESET);
    for (int j = 0; j < extractionOperations.getLength(); j++) {
        Node extractionOperation = extractionOperations.item(j);
        String uri = (String) urlXpath.evaluate(extractionOperation, XPathConstants.STRING);
        NodeList extractions = (NodeList) extractionsExtractionXpath.evaluate(extractionOperation,
                XPathConstants.NODESET);
        List<ExtractionPair> exts = new ArrayList<>();
        for (int k = 0; k < extractions.getLength(); k++) {
            Node extraction = extractions.item(k);
            String source = (String) sourceXpath.evaluate(extraction, XPathConstants.STRING);
            String destination = (String) destinationXpath.evaluate(extraction, XPathConstants.STRING);
            exts.add(new ExtractionPair(source, destination));
        }//from w w  w. jav a2 s  .co m
        extract(uri, exts);
    }
}

From source file:org.opencastproject.remotetest.server.EpisodeServiceTest.java

@Test
public void testLockMediaPackage() throws Exception {
    // get a media package id
    Document r1 = doGetRequest("workflow/instances.xml", HttpStatus.SC_OK, tuple("startPage", 0),
            tuple("count", 1));
    String id = (String) xpath(r1, "//*[local-name() = 'mediapackage']/@id", XPathConstants.STRING);
    ////from  w w  w. j  a  v a  2s  . c o m
    Document r2 = doGetRequest("episode/episode.xml", HttpStatus.SC_OK, tuple("id", id), tuple("limit", 0),
            tuple("offset", 0));
    boolean locked = Boolean
            .parseBoolean((String) xpath(r2, "//*[local-name() = 'ocLocked']", XPathConstants.STRING));
    // un/lock this package
    if (locked) {
        doPostRequest("episode/unlock", HttpStatus.SC_NO_CONTENT, tuple("id", id));
    } else {
        doPostRequest("episode/lock", HttpStatus.SC_NO_CONTENT, tuple("id", id));
        // TODO test apply should not work
    }
    // and test it
    Document r3 = doGetRequest("episode/episode.xml", HttpStatus.SC_OK, tuple("id", id), tuple("limit", 0),
            tuple("offset", 0));
    boolean newLocked = Boolean
            .parseBoolean((String) xpath(r3, "//*[local-name() = 'ocLocked']", XPathConstants.STRING));
    System.out.println(newLocked);
    assertEquals(!locked, newLocked);
}

From source file:org.opencastproject.remotetest.server.ServiceRegistryRestEndpointTest.java

@Test
public void testGetServiceRegistrations() throws Exception {
    // Get a known service registration as xml
    HttpGet get = new HttpGet(
            serviceUrl + "/services.xml?serviceType=org.opencastproject.composer&host=" + remoteHost);
    HttpResponse response = client.execute(get);
    Assert.assertEquals(HttpStatus.SC_OK, response.getStatusLine().getStatusCode());
    InputStream in = null;/* w w  w .j a v a 2  s .  co m*/
    Document doc = null;

    try {
        in = response.getEntity().getContent();
        doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(in);
        String typeFromResponse = (String) Utils.xpath(doc, "//*[local-name() = 'type']",
                XPathConstants.STRING);
        Assert.assertEquals("org.opencastproject.composer", typeFromResponse);
        String hostFromResponse = (String) Utils.xpath(doc, "//*[local-name() = 'host']",
                XPathConstants.STRING);
        Assert.assertEquals(BASE_URL, hostFromResponse);
    } finally {
        IOUtils.closeQuietly(in);
        Main.returnClient(client);
    }

    // Get a registration that is known to not exist, and ensure we get a 404
    client = Main.getClient();
    get = new HttpGet(serviceUrl + "/services.xml?serviceType=foo&host=" + remoteHost);
    response = client.execute(get);
    Assert.assertEquals(HttpStatus.SC_NOT_FOUND, response.getStatusLine().getStatusCode());

    // Get all services on a single host
    client = Main.getClient();
    get = new HttpGet(serviceUrl + "/services.xml?host=" + remoteHost);
    response = client.execute(get);
    Assert.assertEquals(HttpStatus.SC_OK, response.getStatusLine().getStatusCode());
    try {
        in = response.getEntity().getContent();
        doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(in);
        int serviceCount = ((Number) Utils.xpath(doc, "count(//*[local-name() = 'service'])",
                XPathConstants.NUMBER)).intValue();
        Assert.assertTrue(serviceCount > 0);
    } finally {
        IOUtils.closeQuietly(in);
        Main.returnClient(client);
    }

    // Get all services of a single type
    client = Main.getClient();
    get = new HttpGet(serviceUrl + "/services.xml?serviceType=org.opencastproject.composer");
    response = client.execute(get);
    Assert.assertEquals(HttpStatus.SC_OK, response.getStatusLine().getStatusCode());
    try {
        in = response.getEntity().getContent();
        doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(in);
        int serviceCount = ((Number) Utils.xpath(doc, "count(//*[local-name() = 'service'])",
                XPathConstants.NUMBER)).intValue();
        Assert.assertEquals(1, serviceCount);
    } finally {
        IOUtils.closeQuietly(in);
        Main.returnClient(client);
    }

    // Get statistics
    client = Main.getClient();
    get = new HttpGet(serviceUrl + "/statistics.xml");
    response = client.execute(get);
    Assert.assertEquals(HttpStatus.SC_OK, response.getStatusLine().getStatusCode());
    try {
        in = response.getEntity().getContent();
        doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(in);
        int serviceCount = ((Number) Utils.xpath(doc, "count(//*[local-name() = 'service'])",
                XPathConstants.NUMBER)).intValue();
        Assert.assertTrue(serviceCount > 0);
    } finally {
        IOUtils.closeQuietly(in);
        Main.returnClient(client);
    }
}

From source file:cz.incad.cdk.cdkharvester.PidsRetriever.java

private void getDocs() throws Exception {
    String urlStr = harvestUrl + URIUtil.encodeQuery(actual_date);
    logger.log(Level.INFO, "urlStr: {0}", urlStr);
    org.w3c.dom.Document solrDom = solrResults(urlStr);
    String xPathStr = "/response/result/@numFound";
    expr = xpath.compile(xPathStr);/*from w  ww .  j a  v  a 2s . com*/
    int numDocs = Integer.parseInt((String) expr.evaluate(solrDom, XPathConstants.STRING));
    logger.log(Level.INFO, "numDocs: {0}", numDocs);
    if (numDocs > 0) {
        xPathStr = "/response/result/doc/str[@name='PID']";
        expr = xpath.compile(xPathStr);
        NodeList nodes = (NodeList) expr.evaluate(solrDom, XPathConstants.NODESET);
        for (int i = 0; i < nodes.getLength(); i++) {
            Node node = nodes.item(i);
            String pid = node.getFirstChild().getNodeValue();
            String to = node.getNextSibling().getFirstChild().getNodeValue();
            qe.add(new DocEntry(pid, to));
        }
    }
}

From source file:org.trustedanalytics.hadoop.admin.tools.HadoopClientParamsImporter.java

static Optional<Map<String, String>> scanConfigZipArchive(InputStream source)
        throws IOException, XPathExpressionException {

    InputStream zipInputStream = new ZipInputStream(new BufferedInputStream(source));
    ZipEntry zipFileEntry;//  w ww  . jav a 2s.co  m
    Map<String, String> ret = new HashMap<>();
    while ((zipFileEntry = ((ZipInputStream) zipInputStream).getNextEntry()) != null) {
        if (!zipFileEntry.getName().endsWith("-site.xml")) {
            continue;
        }
        byte[] bytes = IOUtils.toByteArray(zipInputStream);
        InputSource is = new InputSource(new ByteArrayInputStream(bytes));
        XPath xPath = XPathFactory.newInstance().newXPath();
        NodeList nodeList = (NodeList) xPath.evaluate(CONF_PROPERTY_XPATH, is, XPathConstants.NODESET);

        for (int i = 0; i < nodeList.getLength(); i++) {
            Node propNode = nodeList.item(i);
            String key = (String) xPath.evaluate("name/text()", propNode, XPathConstants.STRING);
            String value = (String) xPath.evaluate("value/text()", propNode, XPathConstants.STRING);
            ret.put(key, value);
        }
    }
    return Optional.of(ret);
}

From source file:com.hin.hl7messaging.InvoiceSvgService.java

@Override
public String createSvgDocument(Document doc, List<Concept> invoiceServiceArray, String organizationName,
        String telecom, String address, String exchangeRate, String currencyCode) {

    String stringData = "", invoiceId = "", totalAmount = "", doctorName = "", patientName = "", discount = "",
            interest = "";
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    DocumentBuilder db = null;//from w  w w .  j  a va2  s  . c  o m
    HashMap<String, String> serviceMap = new HashMap<String, String>();
    HashMap<String, String> xCoordinatesMap = new HashMap<String, String>();

    String doctorPrefix = (String) XMLHelper.read(doc,
            "message/FIAB_MT020000HT02/postingTo/patientAccount/pertinentInformation/encounterEvent/consultant/employmentStaff/employeePerson/name/prefix",
            XPathConstants.STRING);
    String doctorGiven = (String) XMLHelper.read(doc,
            "message/FIAB_MT020000HT02/postingTo/patientAccount/pertinentInformation/encounterEvent/consultant/employmentStaff/employeePerson/name/given",
            XPathConstants.STRING);
    String doctorFamily = (String) XMLHelper.read(doc,
            "message/FIAB_MT020000HT02/postingTo/patientAccount/pertinentInformation/encounterEvent/consultant/employmentStaff/employeePerson/name/family",
            XPathConstants.STRING);
    String doctorSuffix = (String) XMLHelper.read(doc,
            "message/FIAB_MT020000HT02/postingTo/patientAccount/pertinentInformation/encounterEvent/consultant/employmentStaff/employeePerson/name/suffix",
            XPathConstants.STRING);

    if (doctorPrefix != null && doctorPrefix != "")
        doctorName = doctorName + " " + doctorPrefix;
    if (doctorGiven != null && doctorGiven != "")
        doctorName = doctorName + " " + doctorGiven;
    if (doctorFamily != null && doctorFamily != "")
        doctorName = doctorName + " " + doctorFamily;
    if (doctorSuffix != null && doctorSuffix != "")
        doctorName = doctorName + " " + doctorSuffix;

    NodeList idFields = (NodeList) XMLHelper.read(doc, "message/FIAB_MT020000HT02/id", XPathConstants.NODESET);
    int idSize = idFields.getLength();

    for (int i = 1; i <= idSize; i++) {

        String rootNode = "message/FIAB_MT020000HT02/id[" + i + "]/root";
        String root = (String) XMLHelper.read(doc, rootNode, XPathConstants.STRING);
        root = root.replaceAll("\\n", "").trim();
        if (root.equals("INVOICE_ID")) {
            invoiceId = (String) XMLHelper.read(doc, "message/FIAB_MT020000HT02/id[" + i + "]/extension",
                    XPathConstants.STRING);
        }
        if (root.equals("INVOICE_AMOUNT")) {
            totalAmount = (String) XMLHelper.read(doc, "message/FIAB_MT020000HT02/id[" + i + "]/extension",
                    XPathConstants.STRING);
        }
        if (root.equals("DISCOUNT")) {
            discount = (String) XMLHelper.read(doc, "message/FIAB_MT020000HT02/id[" + i + "]/extension",
                    XPathConstants.STRING);
        }
        if (root.equals("INTEREST")) {
            interest = (String) XMLHelper.read(doc, "message/FIAB_MT020000HT02/id[" + i + "]/extension",
                    XPathConstants.STRING);
        }

    }

    String date = (String) XMLHelper.read(doc, "message/FIAB_MT020000HT02/effectiveTime/value",
            XPathConstants.STRING);
    String[] myStringArray = date.split(" ");
    date = myStringArray[0];

    String prefix = (String) XMLHelper.read(doc,
            "message/FIAB_MT020000HT02/postingTo/patientAccount/pertinentInformation/encounterEvent/subject/patient/patientPerson/name/prefix",
            XPathConstants.STRING);
    String given = (String) XMLHelper.read(doc,
            "message/FIAB_MT020000HT02/postingTo/patientAccount/pertinentInformation/encounterEvent/subject/patient/patientPerson/name/given",
            XPathConstants.STRING);
    String family = (String) XMLHelper.read(doc,
            "message/FIAB_MT020000HT02/postingTo/patientAccount/pertinentInformation/encounterEvent/subject/patient/patientPerson/name/family",
            XPathConstants.STRING);
    String suffix = (String) XMLHelper.read(doc,
            "message/FIAB_MT020000HT02/postingTo/patientAccount/pertinentInformation/encounterEvent/subject/patient/patientPerson/name/suffix",
            XPathConstants.STRING);

    if (prefix != null && prefix != "")
        patientName = patientName + " " + prefix;
    if (given != null && given != "")
        patientName = patientName + " " + given;
    if (family != null && family != "")
        patientName = patientName + " " + family;
    if (suffix != null && suffix != "")
        patientName = patientName + " " + suffix;

    //System.out.println("Patient Name: " + patientName);

    NodeList serviceFields = (NodeList) XMLHelper.read(doc, "message/FIAB_MT020000HT02/pertinentInformation",
            XPathConstants.NODESET);
    int serviceSize = serviceFields.getLength();

    for (int i = 1; i <= serviceSize; i++) {

        String serviceName = (String) XMLHelper.read(doc,
                "message/FIAB_MT020000HT02/pertinentInformation[" + i + "]/observationOrder/code/displayName",
                XPathConstants.STRING);
        serviceName = serviceName.replaceAll("\\n", "").trim();
        String cost = (String) XMLHelper.read(doc,
                "message/FIAB_MT020000HT02/component[" + i
                        + "]/financialTransactionChargeDetail/unitPriceAmt/numerator/value",
                XPathConstants.STRING);
        cost = cost.replaceAll("\\n", "").trim();

        String serviceCode = (String) XMLHelper.read(doc,
                "message/FIAB_MT020000HT02/pertinentInformation[" + i + "]/observationOrder/code/code",
                XPathConstants.STRING);
        serviceCode = serviceCode.replaceAll("\\n", "").trim();

        serviceMap.put(serviceName, cost);

        if (invoiceServiceArray != null && !invoiceServiceArray.isEmpty()) {
            for (Concept service : invoiceServiceArray) {
                if (!service.getDescription().equals(serviceCode)) {
                    serviceMap.put("---" + service.getDescription(), "");
                }
            }
        }
    }

    try {
        db = dbf.newDocumentBuilder();
    } catch (ParserConfigurationException e) {
        e.printStackTrace();
    }

    Document document = db.newDocument();
    Element rootElement = createRootElement(document);
    Element g = document.createElement("g");
    Element subG = document.createElement("g");

    Element imageElement = createImage(document, subG);

    String style = "font-size:18.44000006px;font-variant:normal;font-weight:normal;writing-mode:lr-tb;fill:#500e4a;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:Myriad Pro Light;-inkscape-font-specification:Myriad Pro Light";

    Element organizationElement = createTestTitleElement(document, subG, organizationName, "500", "113", style);
    Element addressElement = createTestTitleElement(document, subG, address, "500", "133", style);
    Element telecomElement = createTestTitleElement(document, subG, telecom, "500", "153", style);

    style = "font-size:25.52000046px;font-variant:normal;font-weight:bold;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:Myriad Pro Light;-inkscape-font-specification:Myriad Pro Light-Bold";
    Element headerElement = createTestTitleElement(document, subG, "INVOICE", "1050", "113", style);

    style = "font-size:18.44000006px;font-variant:normal;font-weight:bold;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:Myriad Pro Light;-inkscape-font-specification:Myriad Pro Light-Bold";
    Element customerElement = createTestTitleElement(document, subG, "To: " + patientName, "100", "290", style);

    style = "font-size:18.44000006px;font-variant:normal;font-weight:normal;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:Myriad Pro Light;-inkscape-font-specification:Myriad Pro Light";
    Element invoiceNumElement = createTestTitleElement(document, subG, "Invoice Number : " + invoiceId, "930",
            "290", style);
    Element dateElement = createTestTitleElement(document, subG, "Date : " + date, "930", "310", style);
    Element doctorElement = createTestTitleElement(document, subG, "Doctor : " + doctorName, "930", "330",
            style);

    Element horizontalElement = createHorizontalLine(document, subG, "100", "380");
    Element verticalElement = createVerticleLines(document, subG, "100", "380", serviceMap.size());
    Element horizontalHeaderEndElement = createHorizontalLine(document, subG, "100", "450");

    style = "font-size:18.44000006px;font-variant:normal;font-weight:bold;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:Myriad Pro Light;-inkscape-font-specification:Myriad Pro Light-Bold";
    Element descriptionElement = createTestTitleElement(document, subG, "Description", "400", "410", style);
    Element amtHeaderElement = createTestTitleElement(document, subG, "Amount in USD", "980", "410", style);

    style = "font-size:18.44000006px;font-variant:normal;font-weight:normal;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:Myriad Pro Light;-inkscape-font-specification:Myriad Pro Light";

    xCoordinatesMap.put("115", "1150");

    Element closeElement = createEndComponent(document, subG, "100", String.valueOf(serviceYAxis + 100),
            totalAmount, exchangeRate, currencyCode, discount, interest);
    Element serviceElement = createServiceElement(document, subG, serviceMap, xCoordinatesMap, "480", style);

    rootElement.appendChild(g);
    g.appendChild(imageElement);
    g.appendChild(organizationElement);
    g.appendChild(addressElement);
    g.appendChild(telecomElement);
    g.appendChild(headerElement);
    g.appendChild(customerElement);
    g.appendChild(invoiceNumElement);
    g.appendChild(dateElement);
    g.appendChild(doctorElement);
    g.appendChild(horizontalElement);
    g.appendChild(verticalElement);
    g.appendChild(horizontalHeaderEndElement);
    g.appendChild(descriptionElement);
    g.appendChild(amtHeaderElement);
    g.appendChild(closeElement);
    g.appendChild(serviceElement);
    g.appendChild(serviceElement);

    document.appendChild(rootElement);
    stringData = XMLHelper.getXMLDocumentAsString(document);
    //System.out.println(stringData);
    return stringData;
}

From source file:edu.sampleu.travel.workflow.TravelAccountRulesEngineExecutor.java

private String getElementValue(String docContent, String xpathExpression) {
    try {/* w w  w  . j  ava2 s  .  c o  m*/
        Document document = XmlHelper.trimXml(new ByteArrayInputStream(docContent.getBytes()));

        XPath xpath = XPathHelper.newXPath();
        String value = (String) xpath.evaluate(xpathExpression, document, XPathConstants.STRING);

        return value;

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

From source file:com.github.radium226.github.maven.MetaDataDownloader.java

public static String evaluateXPath(InputStream pomInputStream, String expression)
        throws XPathExpressionException {
    XPathFactory xPathFactory = XPathFactory.newInstance();
    XPath xPath = xPathFactory.newXPath();
    xPath.setNamespaceContext(new NamespaceContext() {

        @Override/*  w w  w  .  ja  v a2s. c o  m*/
        public String getNamespaceURI(String prefix) {
            if (prefix.equals("ns")) {
                return "http://maven.apache.org/POM/4.0.0";
            }

            return null;
        }

        @Override
        public String getPrefix(String namespaceURI) {
            return null;
        }

        @Override
        public Iterator getPrefixes(String namespaceURI) {
            return null;
        }
    });
    XPathExpression xPathExpression = xPath.compile(expression);
    String version = (String) xPathExpression.evaluate(new InputSource(pomInputStream), XPathConstants.STRING);
    return version;
}