Examples of org.jaxen.XPath.booleanValueOf()

org.jaxen.XPath.booleanValueOf()
Retrieve a boolean-value interpretation of this XPath expression when evaluated against a given context.
The boolean-value of the expression is determined per the boolean(..) core function as defined in the XPath specification. This means that an expression that selects zero nodes will return false, while an expression that selects one-or-more nodes will return true.
@param The node, nodeset or Context object for evaluation. This value can be null @return The boolean-value interpretation of this expression.

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

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    @Override
    public boolean evaluateAsBoolean(String expression, Source context) throws XPathException {
        try {
            XPath xpath = createXPath(expression);
            Element element = getRootElement(context);
            return xpath.booleanValueOf(element);
        }
        catch (JaxenException ex) {
            throw new XPathException("Could not evaluate XPath expression [" + expression + "]", ex);
        }
        catch (TransformerException ex) {

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

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

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    /** Evaluates an XPath expression to a boolean value. */
    public boolean booleanValueOf(Node n, String xpath)
      throws SAXPathException {
  staticInit();
  XPath xp = parse(xpath);
  return xp.booleanValueOf(getLocalContext(n));
    }


    /** Evalutes an XPath expression to a List of nodes. */
    public List selectNodes(Node n, String xpath) throws SAXPathException {
  staticInit();

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

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

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

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            SAXReader reader = new SAXReader();


            Document doc = reader.read( "xml/simple.xml" );


            boolean answer = xpath.booleanValueOf( doc );


            assertTrue( "Xpath worked: " + xpath, answer );


            xpath = new Dom4jXPath( "'a' = 'b'" );

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            assertTrue( "Xpath worked: " + xpath, answer );


            xpath = new Dom4jXPath( "'a' = 'b'" );
            
            answer = xpath.booleanValueOf( doc );


            assertTrue( "XPath should return false: " + xpath, ! answer );


        }
        catch (Exception e)

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