Map<Object, Map<Object, Map<Object, Object>>> map = new HashMap<>();
/**
* put operations
**/
Map<Object, Map<Object, Object>> a = null;
Map<Object, Object> b = null;
Object c = null;
a = map.get(/*some object*/);
if(a != null) {
    b = a.get(/*some object*/);
}
if(b != null) {
    c = b.get(/*some object*/);
}
if(c != null) {
    /*do what I want to do*/
}