2 * Copyright (C) 1994-1999, Index Data
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.19 1999-02-02 14:51:34 adam
8 * Updated WIN32 code specific sections. Changed header.
10 * Revision 1.18 1998/03/05 08:36:28 adam
11 * New result set model.
13 * Revision 1.17 1997/12/18 10:54:25 adam
14 * New method result set method rs_hits that returns the number of
15 * hits in result-set (if known). The ranked result set returns real
16 * number of hits but only when not combined with other operands.
18 * Revision 1.16 1997/10/31 12:37:01 adam
19 * Code calls xfree() instead of free().
21 * Revision 1.15 1996/10/29 13:55:22 adam
22 * Include of zebrautl.h instead of alexutil.h.
24 * Revision 1.14 1995/12/11 09:15:24 adam
25 * New set types: sand/sor/snot - ranked versions of and/or/not in
26 * ranked/semi-ranked result sets.
27 * Note: the snot not finished yet.
28 * New rset member: flag.
29 * Bug fix: r_delete in rsrel.c did free bad memory block.
31 * Revision 1.13 1995/10/12 12:41:56 adam
32 * Private info (buf) moved from struct rset_control to struct rset.
33 * Bug fixes in relevance.
35 * Revision 1.12 1995/10/10 14:00:04 adam
36 * Function rset_open changed its wflag parameter to general flags.
38 * Revision 1.11 1995/10/06 14:38:05 adam
39 * New result set method: r_score.
40 * Local no (sysno) and score is transferred to retrieveCtrl.
42 * Revision 1.10 1995/09/08 14:52:42 adam
43 * Work on relevance feedback.
45 * Revision 1.9 1995/09/07 13:58:43 adam
46 * New parameter: result-set file descriptor (RSFD) to support multiple
47 * positions within the same result-set.
48 * Boolean operators: and, or, not implemented.
50 * Revision 1.8 1995/09/06 16:11:56 adam
51 * More work on boolean sets.
53 * Revision 1.7 1995/09/06 10:35:44 adam
54 * Null set implemented.
56 * Revision 1.6 1995/09/05 11:43:24 adam
57 * Complete version of temporary sets. Not tested yet though.
59 * Revision 1.5 1995/09/04 12:33:56 adam
60 * Various cleanup. YAZ util used instead.
62 * Revision 1.4 1995/09/04 09:10:55 adam
65 * Revision 1.3 1994/11/22 13:15:37 quinn
68 * Revision 1.2 1994/11/04 14:53:12 quinn
78 static void *r_create(RSET ct, const struct rset_control *sel, void *parms);
79 static RSFD r_open (RSET ct, int flag);
80 static void r_close (RSFD rfd);
81 static void r_delete (RSET ct);
82 static void r_rewind (RSFD rfd);
83 static int r_count (RSET ct);
84 static int r_read (RSFD rfd, void *buf, int *term_index);
85 static int r_write (RSFD rfd, const void *buf);
87 static const struct rset_control control =
100 const struct rset_control *rset_kind_isam = &control;
102 struct rset_ispt_info {
104 struct rset_ispt_info *next;
105 struct rset_isam_info *info;
108 struct rset_isam_info {
111 struct rset_ispt_info *ispt_list;
114 static void *r_create(RSET ct, const struct rset_control *sel, void *parms)
116 rset_isam_parms *pt = parms;
117 struct rset_isam_info *info;
119 ct->flags |= RSET_FLAG_VOLATILE;
120 info = xmalloc (sizeof(struct rset_isam_info));
123 info->ispt_list = NULL;
125 ct->no_rset_terms = 1;
126 ct->rset_terms = xmalloc (sizeof(*ct->rset_terms));
127 ct->rset_terms[0] = pt->rset_term;
131 RSFD r_open (RSET ct, int flag)
133 struct rset_isam_info *info = ct->buf;
134 struct rset_ispt_info *ptinfo;
136 logf (LOG_DEBUG, "risam_open");
137 if (flag & RSETF_WRITE)
139 logf (LOG_FATAL, "ISAM set type is read-only");
142 ptinfo = xmalloc (sizeof(*ptinfo));
143 ptinfo->next = info->ispt_list;
144 info->ispt_list = ptinfo;
145 ptinfo->pt = is_position (info->is, info->pos);
148 if (ct->rset_terms[0]->nn < 0)
149 ct->rset_terms[0]->nn = is_numkeys (ptinfo->pt);
153 static void r_close (RSFD rfd)
155 struct rset_isam_info *info = ((struct rset_ispt_info*) rfd)->info;
156 struct rset_ispt_info **ptinfop;
158 for (ptinfop = &info->ispt_list; *ptinfop; ptinfop = &(*ptinfop)->next)
161 is_pt_free ((*ptinfop)->pt);
162 *ptinfop = (*ptinfop)->next;
166 logf (LOG_FATAL, "r_close but no rfd match!");
170 static void r_delete (RSET ct)
172 struct rset_isam_info *info = ct->buf;
174 logf (LOG_DEBUG, "rsisam_delete");
175 assert (info->ispt_list == NULL);
176 rset_term_destroy (ct->rset_terms[0]);
177 xfree (ct->rset_terms);
181 static void r_rewind (RSFD rfd)
183 logf (LOG_DEBUG, "rsisam_rewind");
184 is_rewind( ((struct rset_ispt_info*) rfd)->pt);
187 static int r_count (RSET ct)
192 static int r_read (RSFD rfd, void *buf, int *term_index)
195 return is_readkey( ((struct rset_ispt_info*) rfd)->pt, buf);
198 static int r_write (RSFD rfd, const void *buf)
200 logf (LOG_FATAL, "ISAM set type is read-only");