Examples of javax.xml.xpath.XPath.evaluate()

javax.xml.xpath.XPath.evaluate()

Evaluate an XPath expression in the specified context and return the result as the specified type.

See Evaluation of XPath Expressions for context item evaluation, variable, function and QName resolution and return type conversion.

If returnType is not one of the types defined in {@link XPathConstants} ({@link XPathConstants#NUMBER NUMBER}, {@link XPathConstants#STRING STRING}, {@link XPathConstants#BOOLEAN BOOLEAN}, {@link XPathConstants#NODE NODE} or{@link XPathConstants#NODESET NODESET}) then an IllegalArgumentException is thrown.

If a null value is provided for item, an empty document will be used for the context. If expression or returnType is null, then a NullPointerException is thrown.
@param expression The XPath expression. @param item The starting context (node or node list, for example). @param returnType The desired return type. @return Result of evaluating an XPath expression as an Object of returnType. @throws XPathExpressionException If expression cannot be evaluated. @throws IllegalArgumentException If returnType is not one of the types defined in {@link XPathConstants}. @throws NullPointerException If expression or returnType is null.

      @Override
      protected TokenFilterFactory register(String name, TokenFilterFactory plugin) throws Exception {
        return null; // used for map registration
      }
    };
    filterLoader.load( loader, (NodeList)xpath.evaluate("./filter", node, XPathConstants.NODESET) );


    return new TokenizerChain(charFilters.toArray(new CharFilterFactory[charFilters.size()]),
        tokenizers.get(0), filters.toArray(new TokenFilterFactory[filters.size()]));
  };

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    }
  }
  
  private Properties readProperties(Config cfg, Node node) throws XPathExpressionException {
      XPath xpath = cfg.getXPath();
      NodeList props = (NodeList) xpath.evaluate("property", node, XPathConstants.NODESET);
      Properties properties = new Properties();
      for (int i=0; i<props.getLength(); i++) {
        Node prop = props.item(i);
        properties.setProperty(DOMUtil.getAttr(prop, "name"), DOMUtil.getAttr(prop, "value"));
      }

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    XPath xpath = xpathFactory.newXPath();
    try {
      String xstr=normalize(path);


      // TODO: instead of prepending /prefix/, we could do the search rooted at /prefix...
      Object o = xpath.evaluate(xstr, doc, type);
      return o;


    } catch (XPathExpressionException e) {
      throw new SolrException( SolrException.ErrorCode.SERVER_ERROR,"Error in xpath:" + path +" for " + name,e,false);
    }

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   XPath xpath = xpathFactory.newXPath();
   Node nd = null;
   String xstr = normalize(path);


    try {
      nd = (Node)xpath.evaluate(xstr, doc, XPathConstants.NODE);


      if (nd==null) {
        if (errIfMissing) {
          throw new RuntimeException(name + " missing "+path);
        } else {

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    final String analyzerName = DOMUtil.getAttr(attrs, "class");


    // check for all of these up front, so we can error if used in
    // conjunction with an explicit analyzer class.
    final XPath xpath = XPathFactory.newInstance().newXPath();
    final NodeList charFilterNodes = (NodeList) xpath.evaluate
      ("./charFilter",  node, XPathConstants.NODESET);
    final NodeList tokenizerNodes = (NodeList) xpath.evaluate
      ("./tokenizer", node, XPathConstants.NODESET);
    final NodeList tokenFilterNodes = (NodeList) xpath.evaluate
      ("./filter", node, XPathConstants.NODESET);

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    // check for all of these up front, so we can error if used in
    // conjunction with an explicit analyzer class.
    final XPath xpath = XPathFactory.newInstance().newXPath();
    final NodeList charFilterNodes = (NodeList) xpath.evaluate
      ("./charFilter",  node, XPathConstants.NODESET);
    final NodeList tokenizerNodes = (NodeList) xpath.evaluate
      ("./tokenizer", node, XPathConstants.NODESET);
    final NodeList tokenFilterNodes = (NodeList) xpath.evaluate
      ("./filter", node, XPathConstants.NODESET);


    if (analyzerName != null) {

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    final XPath xpath = XPathFactory.newInstance().newXPath();
    final NodeList charFilterNodes = (NodeList) xpath.evaluate
      ("./charFilter",  node, XPathConstants.NODESET);
    final NodeList tokenizerNodes = (NodeList) xpath.evaluate
      ("./tokenizer", node, XPathConstants.NODESET);
    final NodeList tokenFilterNodes = (NodeList) xpath.evaluate
      ("./filter", node, XPathConstants.NODESET);


    if (analyzerName != null) {


      // explicitly check for child analysis factories instead of

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      // pass the config resource loader to avoid building an empty one for no reason:
      // in the current case though, the stream is valid so we wont load the resource by name
      final Config schemaConf = new Config(loader, "datatypeConfig", is, "/datatypeConfig/");
      final Document document = schemaConf.getDocument();
      final XPath xpath = schemaConf.getXPath();
      final Node nd = (Node) xpath.evaluate("/datatypeConfig/@name", document, XPathConstants.NODE);
      if (nd == null) {
        log.warn("datatypeConfig has no name!");
      }
      else {
        name = nd.getNodeValue();

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          final Datatype dt = loader.newInstance(className, Datatype.class);
          dt.setDatatypeName(name);


          // An analyzer with type="index"
          String expression = "./analyzer[@type='index']";
          Node anode = (Node) xpath.evaluate(expression, node, XPathConstants.NODE);
          final Analyzer analyzer = AnalyzerConfigReader.readAnalyzer(anode,
            loader, luceneMatchVersion);
          if (analyzer != null) dt.setAnalyzer(analyzer);


          expression = "./analyzer[@type='query']";

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          final Analyzer analyzer = AnalyzerConfigReader.readAnalyzer(anode,
            loader, luceneMatchVersion);
          if (analyzer != null) dt.setAnalyzer(analyzer);


          expression = "./analyzer[@type='query']";
          anode = (Node) xpath.evaluate(expression, node, XPathConstants.NODE);
          final Analyzer queryAnalyzer = AnalyzerConfigReader.readAnalyzer(anode,
            loader, luceneMatchVersion);
          if (queryAnalyzer != null) dt.setQueryAnalyzer(queryAnalyzer);


          return dt;

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