Examples of org.jaxen.BaseXPath.selectSingleNode()

org.jaxen.BaseXPath.selectSingleNode()

Select only the first node that is selectable by this XPath expression. If multiple nodes match, only one node will be returned. NOTE: In most cases, the selected node will be the first selectable node in document-order, as defined by the XML Canonicalization specification. The exception occurs when using XPath expressions involving the union operator (denoted with the pipe '|' character).

@param node The node, nodeset or Context object for evaluation. This value can be null. @return The node-set of all items selectedby this XPath expression. @see #selectNodes

        Element root = doc.createElement("root");
        doc.appendChild(root);
        Element child = doc.createElement("child");
        root.appendChild(child);
        
        assertEquals(child, xpath.selectSingleNode(doc));
        
    }
    
    
    public void testEvaluateWithMultiNodeAnswer() throws JaxenException {

      throws JaxenException {
        
        BaseXPath xpath = new DOMXPath("id('p1')");
        org.w3c.dom.Element a = doc.createElementNS("", "a");
        doc.appendChild(a);
        Object result = xpath.selectSingleNode(doc);
        assertNull(result);
        
    }  
    
    public void testSAXPathExceptionThrownFromConstructor() {

      throws JaxenException {
        
        BaseXPath xpath = new DOMXPath("id('p1')");
        org.w3c.dom.Element a = doc.createElementNS("", "a");
        doc.appendChild(a);
        Object result = xpath.selectSingleNode(doc);
        assertNull(result);
        
    }  
    
    public void testSAXPathExceptionThrownFromConstructor() {

        Element root = doc.createElement("root");
        doc.appendChild(root);
        Element child = doc.createElement("child");
        root.appendChild(child);
        
        assertEquals(child, xpath.selectSingleNode(doc));
        
    }
    
    
    public void testEvaluateWithMultiNodeAnswer() throws JaxenException {

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