2 * Copyright (C) 1994-1995, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.10 1998-03-05 08:36:28 adam
8 * New result set model.
10 * Revision 1.9 1997/12/18 10:54:25 adam
11 * New method result set method rs_hits that returns the number of
12 * hits in result-set (if known). The ranked result set returns real
13 * number of hits but only when not combined with other operands.
15 * Revision 1.8 1996/10/29 13:55:24 adam
16 * Include of zebrautl.h instead of alexutil.h.
18 * Revision 1.7 1995/12/11 09:15:25 adam
19 * New set types: sand/sor/snot - ranked versions of and/or/not in
20 * ranked/semi-ranked result sets.
21 * Note: the snot not finished yet.
22 * New rset member: flag.
23 * Bug fix: r_delete in rsrel.c did free bad memory block.
25 * Revision 1.6 1995/10/12 12:41:57 adam
26 * Private info (buf) moved from struct rset_control to struct rset.
27 * Bug fixes in relevance.
29 * Revision 1.5 1995/10/10 14:00:04 adam
30 * Function rset_open changed its wflag parameter to general flags.
32 * Revision 1.4 1995/10/06 14:38:06 adam
33 * New result set method: r_score.
34 * Local no (sysno) and score is transferred to retrieveCtrl.
36 * Revision 1.3 1995/09/08 14:52:42 adam
37 * Work on relevance feedback.
39 * Revision 1.2 1995/09/07 13:58:43 adam
40 * New parameter: result-set file descriptor (RSFD) to support multiple
41 * positions within the same result-set.
42 * Boolean operators: and, or, not implemented.
44 * Revision 1.1 1995/09/06 10:35:44 adam
45 * Null set implemented.
53 static void *r_create(RSET ct, const struct rset_control *sel, void *parms);
54 static RSFD r_open (RSET ct, int flag);
55 static void r_close (RSFD rfd);
56 static void r_delete (RSET ct);
57 static void r_rewind (RSFD rfd);
58 static int r_count (RSET ct);
59 static int r_read (RSFD rfd, void *buf, int *term_index);
60 static int r_write (RSFD rfd, const void *buf);
62 static const struct rset_control control =
75 const struct rset_control *rset_kind_null = &control;
77 static void *r_create(RSET ct, const struct rset_control *sel, void *parms)
79 rset_null_parms *null_parms = parms;
81 ct->no_rset_terms = 1;
82 ct->rset_terms = xmalloc (sizeof(*ct->rset_terms));
84 ct->rset_terms[0] = null_parms->rset_term;
86 ct->rset_terms[0] = rset_term_create ("term", -1, "rank-0");
87 ct->rset_terms[0]->nn = 0;
92 static RSFD r_open (RSET ct, int flag)
94 if (flag & RSETF_WRITE)
96 logf (LOG_FATAL, "NULL set type is read-only");
102 static void r_close (RSFD rfd)
106 static void r_delete (RSET ct)
108 rset_term_destroy (ct->rset_terms[0]);
109 xfree (ct->rset_terms);
112 static void r_rewind (RSFD rfd)
114 logf (LOG_DEBUG, "rsnull_rewind");
117 static int r_count (RSET ct)
122 static int r_read (RSFD rfd, void *buf, int *term_index)
128 static int r_write (RSFD rfd, const void *buf)
130 logf (LOG_FATAL, "NULL set type is read-only");