XPathEvaluator.java 文件源码

public void init(Node ctx, final Map<String, Object> properties, 
        final ReferenceResolver referenceResolver){
    XPathFactory factory = XPathFactory.newInstance();
    xpath = factory.newXPath();
    xpath.setXPathVariableResolver(new XPathVariableResolver(){
        @Override
        public Object resolveVariable(QName variableName) {
            return properties.get(variableName.getLocalPart());
        }
    });
    xpath.setXPathFunctionResolver(new XPathFunctionResolver(){

        @Override
        public XPathFunction resolveFunction(QName name, int arity) {
            if (FUNC_RANDOM.equals(name.getLocalPart())){
                return new XPathFunctionRandom();                                           
            }
            if (FUNC_EVALUATE.equals(name.getLocalPart())){
                return new XPathFunctionEvaluate(referenceResolver);
            }
            return null;
        }
    });
    this.ctx=ctx;
}