public WildcardTermEnum(IndexReader reader, Term term) throws IOException {
    super();
    searchTerm = term;
    field = searchTerm.field();
    text = searchTerm.text();

    int sidx = text.indexOf(WILDCARD_STRING);
    int cidx = text.indexOf(WILDCARD_CHAR);
    int idx = sidx;
    if (idx == -1) {
      idx = cidx;
    }
    else if (cidx >= 0) {
      idx = Math.min(idx, cidx);
    }

    pre = searchTerm.text().substring(0,idx);
    preLen = pre.length();
    text = text.substring(preLen);
    setEnum(reader.terms(new Term(searchTerm.field(), pre)));
  }