Examples of org.jaxen.BaseXPath

org.jaxen.BaseXPath
Base functionality for all concrete, implementation-specific XPaths.
This class provides generic functionalty for further-defined implementation-specific XPaths.

If you want to adapt the Jaxen engine so that it can traverse your own object model then this is a good base class to derive from. Typically you only really need to provide your own {@link org.jaxen.Navigator} implementation.
@see org.jaxen.dom4j.Dom4jXPath XPath for dom4j @see org.jaxen.jdom.JDOMXPath XPath for JDOM @see org.jaxen.dom.DOMXPath XPath for W3C DOM @see org.jaxen.exml.ElectricXPath XPath for Electric XML @author bob mcwhirter @author James Strachan

    Map<String,String> namespaces,
    Map<QName,Function> functions,
    Map<QName,Object> variables)
      throws JaxenException {
    DocumentNavigator nav = new DocumentNavigator();
    XPath contextpath = new BaseXPath(path, nav);
    if (namespaces != null) {
      for (Map.Entry<String, String> entry : namespaces.entrySet()) {
        contextpath.addNamespace(entry.getKey(), entry.getValue());
      }
    }
    if (functions != null) {
      contextpath.setFunctionContext(
        getFunctionContext(
          functions,
          (SimpleFunctionContext)contextpath.getFunctionContext()));
    }
    if (variables != null)
      contextpath.setVariableContext(
        getVariableContext(
          variables,
          (SimpleVariableContext)contextpath.getVariableContext()));
    return contextpath;    
  }

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     * @return Returns a new XPath expression object.
     * @throws SAXPathException if the string is not a syntactically correct XPath expression
     * @see XPath
     */
    public XPath parseXPath(String xpath) throws SAXPathException {
        return new BaseXPath(xpath, this);
    }

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    protected Object assertCountXPath2(int expectedSize, Object context, String xpathStr) throws JaxenException
    {
        log(debug,
                "  Select :: " + xpathStr);
        BaseXPath xpath = new BaseXPath(xpathStr, getNavigator());
        List results = xpath.selectNodes(getContext(context));
        log(debug,
                "    Expected Size :: " + expectedSize);
        log(debug,
                "    Result Size   :: " + results.size());
        if (expectedSize != results.size())
        {
            log(debug,
                    "      ## FAILED");
            log(debug,
                    "      ## xpath: " + xpath + " = " + xpath.debug());
            Iterator resultIter = results.iterator();
            while (resultIter.hasNext())
            {
                log(debug,
                        "      --> " + resultIter.next());

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    {
        try
        {
            log(debug,
                    "  Select :: " + xpathStr);
            BaseXPath xpath = new BaseXPath(xpathStr, getNavigator());
            List results = xpath.selectNodes(getContext(context));
            log(debug,
                    "    Result Size   :: " + results.size());
            fail("An exception was expected.");
        }
        catch (UnsupportedAxisException e)

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    protected void assertValueOfXPath(String expected, Object context, String xpathStr) throws JaxenException
    {
        try
        {
            BaseXPath xpath = new BaseXPath(xpathStr, getNavigator());
            Object node = xpath.evaluate(getContext(context));
            String result = StringFunction.evaluate(node,
                    getNavigator());
            log(debug,
                    "  Select :: " + xpathStr);
            log(debug,
                    "    Expected :: " + expected);
            log(debug,
                    "    Result   :: " + result);
            if (!expected.equals(result))
            {
                log(debug,
                        "      ## FAILED");
                log(debug,
                        "      ## xpath: " + xpath + " = " + xpath.debug());
            }
            assertEquals(xpathStr,
                    expected,
                    result);
        }

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    {
        Navigator nav = getNavigator();
        String url = TESTS_ROOT + "xml/jaxen24.xml";
        log("Document [" + url + "]");
        Object document = nav.getDocument(url);
        XPath contextpath = new BaseXPath("/body/div", nav);
        log("Initial Context :: " + contextpath);
        List list = contextpath.selectNodes(document);
        Iterator iter = list.iterator();
        while (iter.hasNext())
        {
            Object context = iter.next();
            assertCountXPath(1, context, "preceding::*[1]");

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    {
        Navigator nav = getNavigator();
        String url = TESTS_ROOT + "xml/jaxen24.xml";
        log("Document [" + url + "]");
        Object document = nav.getDocument(url);
        XPath contextpath = new BaseXPath("/", nav);
        log("Initial Context :: " + contextpath);
        List list = contextpath.selectNodes(document);
        Iterator iter = list.iterator();
        while (iter.hasNext())
        {
            Object context = iter.next();
            assertCountXPath(0, context, "//preceding::x");

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    {
        Navigator nav = getNavigator();
        String url = TESTS_ROOT + "xml/simple.xml";
        log("Document [" + url + "]");
        Object document = nav.getDocument(url);
        XPath contextpath = new BaseXPath("/", nav);
        log("Initial Context :: " + contextpath);
        List list = contextpath.selectNodes(document);
        Iterator iter = list.iterator();
        while (iter.hasNext())
        {
            Object context = iter.next();
            assertValueOfXPath("abd", context, "string()");

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    {
        Navigator nav = getNavigator();
        String url = TESTS_ROOT + "xml/simple.xml";
        log("Document [" + url + "]");
        Object document = nav.getDocument(url);
        XPath contextpath = new BaseXPath("/root", nav);
        log("Initial Context :: " + contextpath);
        List list = contextpath.selectNodes(document);
        Iterator iter = list.iterator();
        while (iter.hasNext())
        {
            Object context = iter.next();
            assertValueOfXPath("abd", context, "string()");

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    {
        Navigator nav = getNavigator();
        String url = TESTS_ROOT + "xml/simple.xml";
        log("Document [" + url + "]");
        Object document = nav.getDocument(url);
        XPath contextpath = new BaseXPath("/root/a", nav);
        log("Initial Context :: " + contextpath);
        List list = contextpath.selectNodes(document);
        Iterator iter = list.iterator();
        while (iter.hasNext())
        {
            Object context = iter.next();
            assertValueOfXPath("a", context, "string()");

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