grib/src/main/java/ucar/nc2/grib/collection/PartitionCollectionImmutable.java
public String getFilename(int partno, int fileno) throws IOException {
    Partition part = getPartition(partno);
    try (GribCollectionImmutable gc = part.getGribCollection()) {
      return gc.getFilename(fileno);
    }
  }
public String getFilename(int partno, int fileno) throws IOException {
    Partition part = getPartition(partno);
    try (GribCollectionImmutable gc = part.getGribCollection()) {
      return gc.getFilename(fileno);
    }
  }
public String getFilename ( int partno , int fileno ) throws IOException { Partition part = getPartition ( partno ) ; try ( GribCollectionImmutable gc = part . getGribCollection ( ) ) { return gc . getFilename ( fileno ) ; } }
debugging
debugging