2 * Copyright (C) 1994-1999, Index Data
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.20 1999-05-26 07:49:14 adam
10 * Revision 1.19 1999/02/02 14:51:34 adam
11 * Updated WIN32 code specific sections. Changed header.
13 * Revision 1.18 1998/03/05 08:36:28 adam
14 * New result set model.
16 * Revision 1.17 1997/12/18 10:54:25 adam
17 * New method result set method rs_hits that returns the number of
18 * hits in result-set (if known). The ranked result set returns real
19 * number of hits but only when not combined with other operands.
21 * Revision 1.16 1997/10/31 12:37:01 adam
22 * Code calls xfree() instead of free().
24 * Revision 1.15 1996/10/29 13:55:22 adam
25 * Include of zebrautl.h instead of alexutil.h.
27 * Revision 1.14 1995/12/11 09:15:24 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 1.13 1995/10/12 12:41:56 adam
35 * Private info (buf) moved from struct rset_control to struct rset.
36 * Bug fixes in relevance.
38 * Revision 1.12 1995/10/10 14:00:04 adam
39 * Function rset_open changed its wflag parameter to general flags.
41 * Revision 1.11 1995/10/06 14:38:05 adam
42 * New result set method: r_score.
43 * Local no (sysno) and score is transferred to retrieveCtrl.
45 * Revision 1.10 1995/09/08 14:52:42 adam
46 * Work on relevance feedback.
48 * Revision 1.9 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 1.8 1995/09/06 16:11:56 adam
54 * More work on boolean sets.
56 * Revision 1.7 1995/09/06 10:35:44 adam
57 * Null set implemented.
59 * Revision 1.6 1995/09/05 11:43:24 adam
60 * Complete version of temporary sets. Not tested yet though.
62 * Revision 1.5 1995/09/04 12:33:56 adam
63 * Various cleanup. YAZ util used instead.
65 * Revision 1.4 1995/09/04 09:10:55 adam
68 * Revision 1.3 1994/11/22 13:15:37 quinn
71 * Revision 1.2 1994/11/04 14:53:12 quinn
81 static void *r_create(RSET ct, const struct rset_control *sel, void *parms);
82 static RSFD r_open (RSET ct, int flag);
83 static void r_close (RSFD rfd);
84 static void r_delete (RSET ct);
85 static void r_rewind (RSFD rfd);
86 static int r_count (RSET ct);
87 static int r_read (RSFD rfd, void *buf, int *term_index);
88 static int r_write (RSFD rfd, const void *buf);
90 static const struct rset_control control =
103 const struct rset_control *rset_kind_isam = &control;
105 struct rset_ispt_info {
107 struct rset_ispt_info *next;
108 struct rset_isam_info *info;
111 struct rset_isam_info {
114 struct rset_ispt_info *ispt_list;
117 static void *r_create(RSET ct, const struct rset_control *sel, void *parms)
119 rset_isam_parms *pt = (rset_isam_parms *) parms;
120 struct rset_isam_info *info;
122 ct->flags |= RSET_FLAG_VOLATILE;
123 info = (struct rset_isam_info *) xmalloc (sizeof(struct rset_isam_info));
126 info->ispt_list = NULL;
128 ct->no_rset_terms = 1;
129 ct->rset_terms = (RSET_TERM *) xmalloc (sizeof(*ct->rset_terms));
130 ct->rset_terms[0] = pt->rset_term;
134 RSFD r_open (RSET ct, int flag)
136 struct rset_isam_info *info = (struct rset_isam_info *) ct->buf;
137 struct rset_ispt_info *ptinfo;
139 logf (LOG_DEBUG, "risam_open");
140 if (flag & RSETF_WRITE)
142 logf (LOG_FATAL, "ISAM set type is read-only");
145 ptinfo = (struct rset_ispt_info *) xmalloc (sizeof(*ptinfo));
146 ptinfo->next = info->ispt_list;
147 info->ispt_list = ptinfo;
148 ptinfo->pt = is_position (info->is, info->pos);
151 if (ct->rset_terms[0]->nn < 0)
152 ct->rset_terms[0]->nn = is_numkeys (ptinfo->pt);
156 static void r_close (RSFD rfd)
158 struct rset_isam_info *info = ((struct rset_ispt_info*) rfd)->info;
159 struct rset_ispt_info **ptinfop;
161 for (ptinfop = &info->ispt_list; *ptinfop; ptinfop = &(*ptinfop)->next)
164 is_pt_free ((*ptinfop)->pt);
165 *ptinfop = (*ptinfop)->next;
169 logf (LOG_FATAL, "r_close but no rfd match!");
173 static void r_delete (RSET ct)
175 struct rset_isam_info *info = (struct rset_isam_info *) ct->buf;
177 logf (LOG_DEBUG, "rsisam_delete");
178 assert (info->ispt_list == NULL);
179 rset_term_destroy (ct->rset_terms[0]);
180 xfree (ct->rset_terms);
184 static void r_rewind (RSFD rfd)
186 logf (LOG_DEBUG, "rsisam_rewind");
187 is_rewind( ((struct rset_ispt_info*) rfd)->pt);
190 static int r_count (RSET ct)
195 static int r_read (RSFD rfd, void *buf, int *term_index)
198 return is_readkey( ((struct rset_ispt_info*) rfd)->pt, buf);
201 static int r_write (RSFD rfd, const void *buf)
203 logf (LOG_FATAL, "ISAM set type is read-only");