Map param in tag

[Joson Mandaro]

Hi all,
I've written a new Interceptor. It requires a Map parameter named "parser".
private Map<String, String> parser;
// Getter and Setter
public void setParser(Map<String, String> parser) ...

How to parse a Map parameter to it?
Here is what I tried:
<interceptor-ref name="myInterceptorStack">
    <param name="myInterceptor.parser[2]">ABC</param>
    <param name="myInterceptor.parser[8]">EDF</param>
</interceptor>

But then "this.parser" was null in intercept().

Thanks in advanced.