Examples of org.jaxen.BaseXPath.numberValueOf()

org.jaxen.BaseXPath.numberValueOf()
Retrieve a number-value interpretation of this XPath expression when evaluated against a given context.
The number-value of the expression is determined per the number(..) core function as defined in the XPath specification. This means that if this expression selects multiple nodes, the number-value of the first node is returned.
@param node The node, nodeset or Context object for evaluation. This value can be null. @return The number-value interpretation of this expression.

        BaseXPath xpath = new DOMXPath("1 + 2");
        
        String stringValue = xpath.stringValueOf(xpath);
        assertEquals("3", stringValue);
        
        Number numberValue = xpath.numberValueOf(xpath);
        assertEquals(3, numberValue.doubleValue(), 0.00001);
        
    }

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    public void testNumberValueOfEmptyNodeSetIsNaN() throws JaxenException {
        
        BaseXPath xpath = new DOMXPath("/x");
        
        doc.appendChild(doc.createElement("root"));
        Double numberValue = (Double) xpath.numberValueOf(doc);
        assertTrue(numberValue.isNaN());
        
    }

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        BaseXPath xpath = new DOMXPath("1 + 2");
        
        String stringValue = xpath.stringValueOf(xpath);
        assertEquals("3", stringValue);
        
        Number numberValue = xpath.numberValueOf(xpath);
        assertEquals(3, numberValue.doubleValue(), 0.00001);
        
    }

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    public void testNumberValueOfEmptyNodeSetIsNaN() throws JaxenException {
        
        BaseXPath xpath = new DOMXPath("/x");
        
        doc.appendChild(doc.createElement("root"));
        Double numberValue = (Double) xpath.numberValueOf(doc);
        assertTrue(numberValue.isNaN());
        
    }

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