Examples of org.jaxen.XPath.evaluate()

org.jaxen.XPath.evaluate()
Evaluate this XPath against a given context.
The context of evaluation my be a document, an element, or a set of elements.

If the expression evaluates to a single primitive (String, Number or Boolean) type, it is returned directly. Otherwise, the returned value is a List (a node-set, in the terms of the specification) of values.

When using this method, one must be careful to test the class of the returned objects, and of each of the composite members if a List is returned. If the returned members are XML entities, they will be the actual Document, Element or Attribute objects as defined by the concrete XML object-model implementation, directly from the context document. This does not return copies of anything, but merely returns references to entities within the source document.
@param The node, nodeset or Context object for evaluation. This value can be null @return The result of evaluating the XPath expressionagainst the supplied context.

    }    
  
    public void testStringLengthOfEmptyString() throws JaxenException
    {
        XPath xpath = new DOMXPath( "string-length('')" );
        Double result = (Double) xpath.evaluate( doc );
        assertEquals(0, result.intValue());
    }    
  
    public void testStringLengthOfString() throws JaxenException
    {

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    }    
  
    public void testStringLengthOfString() throws JaxenException
    {
        XPath xpath = new DOMXPath( "string-length('0123456789')" );
        Double result = (Double) xpath.evaluate( doc );
        assertEquals(10, result.intValue());
    }    
  
    public void testStringLengthFunctionOperatesOnContextNode() 
      throws JaxenException {

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        XPath xpath = new DOMXPath( "name(//c/preceding::*[1])" );
        DocumentBuilder builder = factory.newDocumentBuilder();
    
        doc = builder.parse("xml/web2.xml");
        Object result = xpath.evaluate(doc);
        assertEquals("d", result);
    }
    
     
    public void testPrecedingAxisInDocumentOrder()

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    Map<String,String> namespaces,
    Map<QName,Function> functions,
    Map<QName,Object> variables) throws XPathException {
    try {
      XPath xpath = getXPath(path, namespaces, functions, variables);
      return xpath.evaluate(base);
    } catch (JaxenException e) {
      throw new XPathException(e);
    }
  }

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    public void testSubstringOfEmptyString() throws JaxenException
    {
        XPath xpath = new DOMXPath( "substring('', 2)" );
        String result = (String) xpath.evaluate( doc );
        assertEquals("", result);
    }    
 
  
    public void testSubstringWithNegativeLength() throws JaxenException

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    public void testSubstringWithNegativeLength() throws JaxenException
    {
        XPath xpath = new DOMXPath( "substring('12345', 2, -3)" );
        String result = (String) xpath.evaluate( doc );
        assertEquals("", result);
    }    
 
  
    public void testSubstringWithExcessiveLength() throws JaxenException

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    public void testSubstringWithExcessiveLength() throws JaxenException
    {
        XPath xpath = new DOMXPath( "substring('12345', 2, 32)" );
        String result = (String) xpath.evaluate( doc );
        assertEquals("2345", result);
    }    
 
  
    public void testSubstringWithNegativeLength2() throws JaxenException

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    public void testSubstringWithNegativeLength2() throws JaxenException
    {
        XPath xpath = new DOMXPath( "substring('12345', 2, -1)" );
        String result = (String) xpath.evaluate( doc );
        assertEquals("", result);
    }    
 
  
    public void testSubstringFunctionRequiresAtLeastTwoArguments()

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    public void testNegativeStartNoLength() 
      throws JaxenException {
        
        XPath xpath = new DOMXPath("substring('Hello', -50)");
        String result = (String) xpath.evaluate( doc );
        assertEquals("Hello", result);
        
    }    


    public void testNegativeStartWithLength()

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    public void testNegativeStartWithLength() 
      throws JaxenException {
        
        XPath xpath = new DOMXPath("substring('Hello', -50, 20)");
        String result = (String) xpath.evaluate( doc );
        assertEquals("", result);
        
    }    


    public void testSubstringFunctionRequiresAtMostThreeArguments()

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