public < T > void put ( Key < T > key , Factory < T > fac ) { checkState ( ht ) ; Object old = ht . put ( key , fac ) ; if ( old != null ) throw new AssertionError ( "duplicate context value" ) ; checkState ( ft ) ; ft . put ( key , fac ) ; // cannot be duplicate if unique in ht }
Set the factory for the key in this context .