Shibboleth Developers

["wz qiang" <>]

hi developers,
I am diving into the source code of Shibboleth, because our project
needs the SAML function. I have some questions about the source code
(Maybe I will have more questions, Sorry for bothering you). 
1, In "SAMLSOAPBinding.java", defines:
{
 public interface SOAPHook {
{
.....
         incoming(Element envelope, Object globalCtx, Object callCtx)
         outgoing(Element envelope, Object globalCtx, Object callCtx)
.....
}
......
public abstract void addHook(SOAPHook h, Object globalCtx);.
}

I wonder who call the "addHook" function, and I cannot find any in all of the *.java files?
Moreover, It seems that "addHook" is basis for "incoming" and
"outgoing" functions, I also wonder where is the implementation of
"incoming" and "outgoing"?
I guess my questions are very simple for you, please help me to solve it.

2, Is the C++ implementation of SAML mature?

Thank you for your help.

Regards,

Weizhong