Examples of org.jaxen.BaseXPath.evaluate()

org.jaxen.BaseXPath.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 node 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 testNaNIsFalse() 
      throws JaxenException {
        
        BaseXPath xpath = new DOMXPath("boolean(0 div 0)");
        Object result = xpath.evaluate(null);
        assertEquals(Boolean.FALSE, result);
        
    }    


    public void testNonEmptyStringIsTrue()

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


    public void testStringLengthWithPrivateUseChars() throws JaxenException

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    public void testStringLengthFunctionCountsUnicodeCharactersNotJavaChars() 
      throws JaxenException {
   
        BaseXPath xpath = new DOMXPath("string-length('\uD834\uDD00')");
        Double result = (Double) xpath.evaluate( doc );
        assertEquals(1, result.intValue());
        
    }    


    public void testStringLengthFunctionWithMalformedString()

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    public void testStringLengthFunctionWithMalformedString() 
      throws JaxenException {
   
        BaseXPath xpath = new DOMXPath("string-length('\uD834A\uDD00')");
        try {
            xpath.evaluate( doc );
            fail("Allowed Malformed string");
        }
        catch (FunctionCallException ex) {
            assertNotNull(ex.getMessage());
        }

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    public void testCountRootElement() 
      throws JaxenException {
        
        BaseXPath xpath = new DOMXPath("count(/*)");
        Double result = (Double) xpath.evaluate(doc);
        assertEquals(1.0, result.doubleValue(), 0.00001);
        
    }

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    public void testCeiling() throws JaxenException {
        
        BaseXPath xpath = new DOMXPath("ceiling(1.5)");
        
        Object result = xpath.evaluate(doc);
        assertEquals(2, ((Double) result).doubleValue(), 0.0001);
        
    }    


    public void testNegativeCeiling() throws JaxenException {

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    public void testNegativeCeiling() throws JaxenException {
        
        BaseXPath xpath = new DOMXPath("ceiling(-1.5)");
        
        Object result = xpath.evaluate(doc);
        assertEquals(-1, ((Double) result).doubleValue(), 0.0001);
        
    }    


    public void testNaNCeilingIsNaN() throws JaxenException {

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    }    


    public void testNaNCeilingIsNaN() throws JaxenException {
        BaseXPath xpath = new DOMXPath("ceiling(1.0 div 0.0 - 2.0 div 0.0)");
        double result = ((Double) xpath.evaluate(doc)).doubleValue();
        assertTrue(Double.isNaN(result));
    }    


    public void testCeilingFunctionRequiresAtLeastOneArgument() 
      throws JaxenException {

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