public BitSet getInputSet ( ValueNumber output ) { BitSet outputSet = outputToInputMap . get ( output ) ; if ( outputSet == null ) { if ( DEBUG ) { System . out . println ( "Create new input set for " + output . getNumber ( ) ) ; } outputSet = new BitSet ( ) ; outputToInputMap . put ( output , outputSet ) ; } return outputSet ; }
Get the set of input ValueNumbers which directly contributed to the given output ValueNumber .