Switch Based off of Name

Hi,

I have a tcp/443 (HTTPS) VIP with an iRule that will allow me to send traffic to a pool based off of the URI; that configuration is:

when HTTP_REQUEST {
    switch [HTTP::host] {
            "x.example.com" {
                    if { [active_members pool-x ] < 1 } {
                            HTTP::respond 200 content [ifile get MaintPage]
                    } else {
                            pool pool-x
                    }   
            } 
            "y.example.com" { 
                    if { [active_members pool-y ] < 1 } {
                            HTTP::respond 200 content [ifile get MaintPage]
                    } else {
                            pool pool-y
                    }   
            } 
            "z.example.com" { 
                    HTTP::redirect http://google.com[HTTP::uri] 
            } 
            default {
                    HTTP::redirect https://[getfield [HTTP::host] ":" 1][HTTP::uri]
            }
    }

Basically my question is how (or can) I can do this for SSH traffic. For the HTTP traffic, I can switch using HTTP::HOST - I've looked for something equivalent that I can use with a tcp/22 (SSH) VIP but cannot figure it out.

-Zac