How to access the instance ID of a class from a base_class, whose child class is instantiated inside.

[Sujitha]

I have a class env_top, inside that I have env[0], env[1],env[2] instantiated. Inside each env, I have sub_envA, sub_envB,sub_envC and the sub_env's are extended from a sub_env_base. Now, how can I identify from my sub_env_base, that I am under env[0] or [1] or [2]?. The sub_env_base and env_top are extended from same top, say my_ovm_env_top.

I need this info inside the sub_env_base, to get the VIFs from the corresponding env instance - env[0] / env[1]/ env[2].