2 * Copyright (C) 1994-1995, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.9 1997-12-18 10:54:25 adam
8 * New method result set method rs_hits that returns the number of
9 * hits in result-set (if known). The ranked result set returns real
10 * number of hits but only when not combined with other operands.
12 * Revision 1.8 1996/10/29 13:55:24 adam
13 * Include of zebrautl.h instead of alexutil.h.
15 * Revision 1.7 1995/12/11 09:15:25 adam
16 * New set types: sand/sor/snot - ranked versions of and/or/not in
17 * ranked/semi-ranked result sets.
18 * Note: the snot not finished yet.
19 * New rset member: flag.
20 * Bug fix: r_delete in rsrel.c did free bad memory block.
22 * Revision 1.6 1995/10/12 12:41:57 adam
23 * Private info (buf) moved from struct rset_control to struct rset.
24 * Bug fixes in relevance.
26 * Revision 1.5 1995/10/10 14:00:04 adam
27 * Function rset_open changed its wflag parameter to general flags.
29 * Revision 1.4 1995/10/06 14:38:06 adam
30 * New result set method: r_score.
31 * Local no (sysno) and score is transferred to retrieveCtrl.
33 * Revision 1.3 1995/09/08 14:52:42 adam
34 * Work on relevance feedback.
36 * Revision 1.2 1995/09/07 13:58:43 adam
37 * New parameter: result-set file descriptor (RSFD) to support multiple
38 * positions within the same result-set.
39 * Boolean operators: and, or, not implemented.
41 * Revision 1.1 1995/09/06 10:35:44 adam
42 * Null set implemented.
50 static void *r_create(const struct rset_control *sel, void *parms,
52 static RSFD r_open (RSET ct, int flag);
53 static void r_close (RSFD rfd);
54 static void r_delete (RSET ct);
55 static void r_rewind (RSFD rfd);
56 static int r_count (RSET ct);
57 static int r_hits (RSET ct, void *oi);
58 static int r_read (RSFD rfd, void *buf);
59 static int r_write (RSFD rfd, const void *buf);
60 static int r_score (RSFD rfd, int *score);
62 static const rset_control control =
77 const rset_control *rset_kind_null = &control;
79 static void *r_create(const struct rset_control *sel, void *parms,
85 static RSFD r_open (RSET ct, int flag)
87 if (flag & RSETF_WRITE)
89 logf (LOG_FATAL, "NULL set type is read-only");
95 static void r_close (RSFD rfd)
99 static void r_delete (RSET ct)
103 static void r_rewind (RSFD rfd)
105 logf (LOG_DEBUG, "rsnull_rewind");
108 static int r_count (RSET ct)
113 static int r_hits (RSET ct, void *oi)
118 static int r_read (RSFD rfd, void *buf)
123 static int r_write (RSFD rfd, const void *buf)
125 logf (LOG_FATAL, "NULL set type is read-only");
129 static int r_score (RSFD rfd, int *score)