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 testNamespaceURIOfTextIsEmptyString() throws JaxenException
    {
        XPath xpath = new DOMXPath( "namespace-uri(/*/text())" );
        Text c = doc.createTextNode("test");
        doc.getDocumentElement().appendChild(c);
        String result = (String) xpath.evaluate(doc);
        assertEquals("", result);
    }    


    public void testNamespaceURIRequiresAtMostOneArgument() throws JaxenException
    {

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    public void testNamespaceURIRequiresAtMostOneArgument() throws JaxenException
    {
        XPath xpath = new DOMXPath( "namespace-uri(/*, /*)" );
        try {
            xpath.evaluate(doc);
            fail("Allowed namespace-uri function with no arguments");
        }
        catch (FunctionCallException ex) {
            assertNotNull(ex.getMessage());
        }

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    }    


    public void testNamespaceURIOfNamespaceIsNull() throws JaxenException
    {
        XPath xpath = new DOMXPath( "namespace-uri(/*/namespace::node())" );
        String result = (String) xpath.evaluate(doc);
        assertEquals("", result);
    }
    
    public void testNamespaceURIOfComment() 
      throws JaxenException {

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        XPath xpath = new DOMXPath("namespace-uri(/a/comment())");
        Document document = builder.getDOMImplementation().createDocument(null, "a", null);
        document.getDocumentElement().appendChild(document.createComment("data"));
        
        String result = (String) xpath.evaluate(document);
        assertEquals("", result);
        
    }


}

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        Text b = doc.createTextNode("ready");
        a.appendChild(b);
        
        XPath xpath = new DOMXPath("..");
        try {
            xpath.evaluate("String");
            fail("Allowed String as context");
        }
        catch (ClassCastException ex) {
            // success
        }

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    }
    
    public void testArithmeticAssociativity() throws JaxenException {
        XPath xpath = new DOMXPath("2+1-1+1");
        Double result = (Double) xpath.evaluate(doc);
        assertEquals(3, result.intValue());
    }
    
    public void testLogicalAssociativity() throws JaxenException {
        XPath xpath = new DOMXPath("false() or true() and true() and false()");

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        assertEquals(3, result.intValue());
    }
    
    public void testLogicalAssociativity() throws JaxenException {
        XPath xpath = new DOMXPath("false() or true() and true() and false()");
        Boolean result = (Boolean) xpath.evaluate(doc);
        assertFalse(result.booleanValue());
    }
    
    public void testRelationalAssociativity3() throws JaxenException {
        XPath xpath = new DOMXPath("3 > 2 > 1");

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        assertFalse(result.booleanValue());
    }
    
    public void testRelationalAssociativity3() throws JaxenException {
        XPath xpath = new DOMXPath("3 > 2 > 1");
        Boolean result = (Boolean) xpath.evaluate(doc);
        assertFalse(result.booleanValue());
    }
    
    public void testRelationalAssociativity4() throws JaxenException {
        XPath xpath = new DOMXPath("4 > 3 > 2 > 1");

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        assertFalse(result.booleanValue());
    }
    
    public void testRelationalAssociativity4() throws JaxenException {
        XPath xpath = new DOMXPath("4 > 3 > 2 > 1");
        Boolean result = (Boolean) xpath.evaluate(doc);
        assertFalse(result.booleanValue());
    }
    
    public void testRelationalGTAssociativity5() throws JaxenException {
        XPath xpath = new DOMXPath("5 > 4 > 3 > 2 > 1");

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        assertFalse(result.booleanValue());
    }
    
    public void testRelationalGTAssociativity5() throws JaxenException {
        XPath xpath = new DOMXPath("5 > 4 > 3 > 2 > 1");
        Boolean result = (Boolean) xpath.evaluate(doc);
        assertFalse(result.booleanValue());
    }
    
    public void testRelationalLTAssociativity5() throws JaxenException {
        XPath xpath = new DOMXPath("1 < 2 < 3 < 4 < 5");

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