2 * Copyright (C) 1994-1999, Index Data
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.13 2002-03-21 10:25:42 adam
8 * use lockDir. Fixes for searchResult for null/sort sets
10 * Revision 1.12 1999/05/26 07:49:14 adam
13 * Revision 1.11 1999/02/02 14:51:36 adam
14 * Updated WIN32 code specific sections. Changed header.
16 * Revision 1.10 1998/03/05 08:36:28 adam
17 * New result set model.
19 * Revision 1.9 1997/12/18 10:54:25 adam
20 * New method result set method rs_hits that returns the number of
21 * hits in result-set (if known). The ranked result set returns real
22 * number of hits but only when not combined with other operands.
24 * Revision 1.8 1996/10/29 13:55:24 adam
25 * Include of zebrautl.h instead of alexutil.h.
27 * Revision 1.7 1995/12/11 09:15:25 adam
28 * New set types: sand/sor/snot - ranked versions of and/or/not in
29 * ranked/semi-ranked result sets.
30 * Note: the snot not finished yet.
31 * New rset member: flag.
32 * Bug fix: r_delete in rsrel.c did free bad memory block.
34 * Revision 1.6 1995/10/12 12:41:57 adam
35 * Private info (buf) moved from struct rset_control to struct rset.
36 * Bug fixes in relevance.
38 * Revision 1.5 1995/10/10 14:00:04 adam
39 * Function rset_open changed its wflag parameter to general flags.
41 * Revision 1.4 1995/10/06 14:38:06 adam
42 * New result set method: r_score.
43 * Local no (sysno) and score is transferred to retrieveCtrl.
45 * Revision 1.3 1995/09/08 14:52:42 adam
46 * Work on relevance feedback.
48 * Revision 1.2 1995/09/07 13:58:43 adam
49 * New parameter: result-set file descriptor (RSFD) to support multiple
50 * positions within the same result-set.
51 * Boolean operators: and, or, not implemented.
53 * Revision 1.1 1995/09/06 10:35:44 adam
54 * Null set implemented.
62 static void *r_create(RSET ct, const struct rset_control *sel, void *parms);
63 static RSFD r_open (RSET ct, int flag);
64 static void r_close (RSFD rfd);
65 static void r_delete (RSET ct);
66 static void r_rewind (RSFD rfd);
67 static int r_count (RSET ct);
68 static int r_read (RSFD rfd, void *buf, int *term_index);
69 static int r_write (RSFD rfd, const void *buf);
71 static const struct rset_control control =
84 const struct rset_control *rset_kind_null = &control;
86 static void *r_create(RSET ct, const struct rset_control *sel, void *parms)
88 rset_null_parms *null_parms = (rset_null_parms *) parms;
90 ct->no_rset_terms = 1;
91 ct->rset_terms = (RSET_TERM *) xmalloc (sizeof(*ct->rset_terms));
92 if (parms && null_parms->rset_term)
93 ct->rset_terms[0] = null_parms->rset_term;
95 ct->rset_terms[0] = rset_term_create ("term", -1, "rank-0");
96 ct->rset_terms[0]->nn = 0;
101 static RSFD r_open (RSET ct, int flag)
103 if (flag & RSETF_WRITE)
105 logf (LOG_FATAL, "NULL set type is read-only");
111 static void r_close (RSFD rfd)
115 static void r_delete (RSET ct)
117 rset_term_destroy (ct->rset_terms[0]);
118 xfree (ct->rset_terms);
121 static void r_rewind (RSFD rfd)
123 logf (LOG_DEBUG, "rsnull_rewind");
126 static int r_count (RSET ct)
131 static int r_read (RSFD rfd, void *buf, int *term_index)
137 static int r_write (RSFD rfd, const void *buf)
139 logf (LOG_FATAL, "NULL set type is read-only");