在过滤器介体中使用XPath函数 [英] Using XPath functions in filter mediator

问题描述

在代理的不连续性中，我正在中使用xpath查询进行过滤过滤器介体.但是我想使用XPath函数，例如exists()或count().但这是行不通的，并且总是会产生异常.这是我的示例:

In my inSequence of a proxy I'm filtering with a xpath query in the filter mediator. But I want to use XPath functions like exists() or count(). But this does not work and always creates an exception. Here my example:

<filter xpath="count($body/myElement)>2">
 <drop/>
</filter>

还有我总是得到的例外:

And the exception I always get:

ERROR - FilterMediator Error evaluating XPath expression : n:exists($body/avintis:Exception)
        org.jaxen.UnresolvableException: No Such Function exists

如何使这些功能起作用?

How can I make these functions work?

推荐答案

您可以将xpath函数与过滤器介体一起使用，以修改突触段，如下所示.

You can use xpath functions with filter mediator as modifying your synapse segment as shown below.

<filter xpath="fn:exists($body/myElement)">
 <drop/>
</filter>

您可以参考样本156:服务集成，并指定[1]中可用的接收顺序以用于进一步的样本.

You can refer for Sample 156: Service Integration with specifying the receiving sequence available at [1] for further sample.

 <filter xpath="fn:number(get-property('SIMPLE_SER_AMT')) > fn:number(get-property('SECURE_SER_AMT'))">

[1]. http://wso2.org/project/esb/java/4.0.3/docs/samples/proxy_samples.html

谢谢， 达沙那(Dharshana)

Thank You, Dharshana

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