/// <summary> Returns the docFreq of the current Term in the enumeration.
 /// Returns -1 if no Term matches or all terms have been enumerated.
 /// </summary>
 public override int DocFreq()
 {
     if (actualEnum == null)
     {
         return(-1);
     }
     return(actualEnum.DocFreq());
 }
 /// <summary> Returns the docFreq of the current Term in the enumeration.
 /// Returns -1 if no Term matches or all terms have been enumerated.
 /// </summary>
 public override int DocFreq()
 {
     if (currentTerm == null)
     {
         return(-1);
     }
     System.Diagnostics.Debug.Assert(actualEnum != null);
     return(actualEnum.DocFreq());
 }