2 * Copyright (C) 1994-1999, Index Data
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.21 1999-11-30 13:48:04 adam
8 * Improved installation. Updated for inclusion of YAZ header files.
10 * Revision 1.20 1999/05/26 07:49:14 adam
13 * Revision 1.19 1999/02/02 14:51:34 adam
14 * Updated WIN32 code specific sections. Changed header.
16 * Revision 1.18 1998/03/05 08:36:28 adam
17 * New result set model.
19 * Revision 1.17 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 1.16 1997/10/31 12:37:01 adam
25 * Code calls xfree() instead of free().
27 * Revision 1.15 1996/10/29 13:55:22 adam
28 * Include of zebrautl.h instead of alexutil.h.
30 * Revision 1.14 1995/12/11 09:15:24 adam
31 * New set types: sand/sor/snot - ranked versions of and/or/not in
32 * ranked/semi-ranked result sets.
33 * Note: the snot not finished yet.
34 * New rset member: flag.
35 * Bug fix: r_delete in rsrel.c did free bad memory block.
37 * Revision 1.13 1995/10/12 12:41:56 adam
38 * Private info (buf) moved from struct rset_control to struct rset.
39 * Bug fixes in relevance.
41 * Revision 1.12 1995/10/10 14:00:04 adam
42 * Function rset_open changed its wflag parameter to general flags.
44 * Revision 1.11 1995/10/06 14:38:05 adam
45 * New result set method: r_score.
46 * Local no (sysno) and score is transferred to retrieveCtrl.
48 * Revision 1.10 1995/09/08 14:52:42 adam
49 * Work on relevance feedback.
51 * Revision 1.9 1995/09/07 13:58:43 adam
52 * New parameter: result-set file descriptor (RSFD) to support multiple
53 * positions within the same result-set.
54 * Boolean operators: and, or, not implemented.
56 * Revision 1.8 1995/09/06 16:11:56 adam
57 * More work on boolean sets.
59 * Revision 1.7 1995/09/06 10:35:44 adam
60 * Null set implemented.
62 * Revision 1.6 1995/09/05 11:43:24 adam
63 * Complete version of temporary sets. Not tested yet though.
65 * Revision 1.5 1995/09/04 12:33:56 adam
66 * Various cleanup. YAZ util used instead.
68 * Revision 1.4 1995/09/04 09:10:55 adam
71 * Revision 1.3 1994/11/22 13:15:37 quinn
74 * Revision 1.2 1994/11/04 14:53:12 quinn
84 static void *r_create(RSET ct, const struct rset_control *sel, void *parms);
85 static RSFD r_open (RSET ct, int flag);
86 static void r_close (RSFD rfd);
87 static void r_delete (RSET ct);
88 static void r_rewind (RSFD rfd);
89 static int r_count (RSET ct);
90 static int r_read (RSFD rfd, void *buf, int *term_index);
91 static int r_write (RSFD rfd, const void *buf);
93 static const struct rset_control control =
106 const struct rset_control *rset_kind_isam = &control;
108 struct rset_ispt_info {
110 struct rset_ispt_info *next;
111 struct rset_isam_info *info;
114 struct rset_isam_info {
117 struct rset_ispt_info *ispt_list;
120 static void *r_create(RSET ct, const struct rset_control *sel, void *parms)
122 rset_isam_parms *pt = (rset_isam_parms *) parms;
123 struct rset_isam_info *info;
125 ct->flags |= RSET_FLAG_VOLATILE;
126 info = (struct rset_isam_info *) xmalloc (sizeof(struct rset_isam_info));
129 info->ispt_list = NULL;
131 ct->no_rset_terms = 1;
132 ct->rset_terms = (RSET_TERM *) xmalloc (sizeof(*ct->rset_terms));
133 ct->rset_terms[0] = pt->rset_term;
137 RSFD r_open (RSET ct, int flag)
139 struct rset_isam_info *info = (struct rset_isam_info *) ct->buf;
140 struct rset_ispt_info *ptinfo;
142 logf (LOG_DEBUG, "risam_open");
143 if (flag & RSETF_WRITE)
145 logf (LOG_FATAL, "ISAM set type is read-only");
148 ptinfo = (struct rset_ispt_info *) xmalloc (sizeof(*ptinfo));
149 ptinfo->next = info->ispt_list;
150 info->ispt_list = ptinfo;
151 ptinfo->pt = is_position (info->is, info->pos);
154 if (ct->rset_terms[0]->nn < 0)
155 ct->rset_terms[0]->nn = is_numkeys (ptinfo->pt);
159 static void r_close (RSFD rfd)
161 struct rset_isam_info *info = ((struct rset_ispt_info*) rfd)->info;
162 struct rset_ispt_info **ptinfop;
164 for (ptinfop = &info->ispt_list; *ptinfop; ptinfop = &(*ptinfop)->next)
167 is_pt_free ((*ptinfop)->pt);
168 *ptinfop = (*ptinfop)->next;
172 logf (LOG_FATAL, "r_close but no rfd match!");
176 static void r_delete (RSET ct)
178 struct rset_isam_info *info = (struct rset_isam_info *) ct->buf;
180 logf (LOG_DEBUG, "rsisam_delete");
181 assert (info->ispt_list == NULL);
182 rset_term_destroy (ct->rset_terms[0]);
183 xfree (ct->rset_terms);
187 static void r_rewind (RSFD rfd)
189 logf (LOG_DEBUG, "rsisam_rewind");
190 is_rewind( ((struct rset_ispt_info*) rfd)->pt);
193 static int r_count (RSET ct)
198 static int r_read (RSFD rfd, void *buf, int *term_index)
201 return is_readkey( ((struct rset_ispt_info*) rfd)->pt, buf);
204 static int r_write (RSFD rfd, const void *buf)
206 logf (LOG_FATAL, "ISAM set type is read-only");