XPathHelper.java 文件源码

/**
 * A utility to extract the WorkflowFunctionResolver from the given XPath instances.  If the XPath instance
 * does not contain a WorkflowFunctionResolver, then this method will throw a WorkflowRuntimeException.
 * 
 * @throws WorkflowRuntimeException if the given XPath instance does not contain a WorklflowFunctionResolver
 */
public static WorkflowFunctionResolver extractFunctionResolver(XPath xPath) {
    XPathFunctionResolver resolver = xPath.getXPathFunctionResolver();
    if (!hasWorkflowFunctionResolver(xPath)) {
        throw new WorkflowRuntimeException("The XPathFunctionResolver on the given XPath instance is not an instance of WorkflowFunctionResolver, was: " + resolver);
    }
    return (WorkflowFunctionResolver)resolver;
}