I made a lib in which SSDD is a class

Question

I made a lib in which SSDD is a class

with child() setValue() etc.. are methods in it in child() you can pass a string like abc or abc/xyz etc which currently stores value in a list but what I want is:-

is there anyway that I can set paths like

if ssdd.child() is called 1st time it's the root

and id it's called again like

2. ssdd.child("abc").push().child("xyz").setValue("hi")

and after that if it's agin called like

3. ssdd.child("abc/xyz1");

ssdd.addValueEventListener(...)

how do I separate 2. and 3.? while root remains same..