2 * Copyright (C) 1994-1995, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.16 1997-10-31 12:37:01 adam
8 * Code calls xfree() instead of free().
10 * Revision 1.15 1996/10/29 13:55:22 adam
11 * Include of zebrautl.h instead of alexutil.h.
13 * Revision 1.14 1995/12/11 09:15:24 adam
14 * New set types: sand/sor/snot - ranked versions of and/or/not in
15 * ranked/semi-ranked result sets.
16 * Note: the snot not finished yet.
17 * New rset member: flag.
18 * Bug fix: r_delete in rsrel.c did free bad memory block.
20 * Revision 1.13 1995/10/12 12:41:56 adam
21 * Private info (buf) moved from struct rset_control to struct rset.
22 * Bug fixes in relevance.
24 * Revision 1.12 1995/10/10 14:00:04 adam
25 * Function rset_open changed its wflag parameter to general flags.
27 * Revision 1.11 1995/10/06 14:38:05 adam
28 * New result set method: r_score.
29 * Local no (sysno) and score is transferred to retrieveCtrl.
31 * Revision 1.10 1995/09/08 14:52:42 adam
32 * Work on relevance feedback.
34 * Revision 1.9 1995/09/07 13:58:43 adam
35 * New parameter: result-set file descriptor (RSFD) to support multiple
36 * positions within the same result-set.
37 * Boolean operators: and, or, not implemented.
39 * Revision 1.8 1995/09/06 16:11:56 adam
40 * More work on boolean sets.
42 * Revision 1.7 1995/09/06 10:35:44 adam
43 * Null set implemented.
45 * Revision 1.6 1995/09/05 11:43:24 adam
46 * Complete version of temporary sets. Not tested yet though.
48 * Revision 1.5 1995/09/04 12:33:56 adam
49 * Various cleanup. YAZ util used instead.
51 * Revision 1.4 1995/09/04 09:10:55 adam
54 * Revision 1.3 1994/11/22 13:15:37 quinn
57 * Revision 1.2 1994/11/04 14:53:12 quinn
67 static void *r_create(const struct rset_control *sel, void *parms,
69 static RSFD r_open (RSET ct, int flag);
70 static void r_close (RSFD rfd);
71 static void r_delete (RSET ct);
72 static void r_rewind (RSFD rfd);
73 static int r_count (RSET ct);
74 static int r_read (RSFD rfd, void *buf);
75 static int r_write (RSFD rfd, const void *buf);
76 static int r_score (RSFD rfd, int *score);
78 static const rset_control control =
92 const rset_control *rset_kind_isam = &control;
94 struct rset_ispt_info {
96 struct rset_ispt_info *next;
97 struct rset_isam_info *info;
100 struct rset_isam_info {
103 struct rset_ispt_info *ispt_list;
106 static void *r_create(const struct rset_control *sel, void *parms,
109 rset_isam_parms *pt = parms;
110 struct rset_isam_info *info;
112 *flags |= RSET_FLAG_VOLATILE;
113 info = xmalloc (sizeof(struct rset_isam_info));
116 info->ispt_list = NULL;
120 RSFD r_open (RSET ct, int flag)
122 struct rset_isam_info *info = ct->buf;
123 struct rset_ispt_info *ptinfo;
125 logf (LOG_DEBUG, "risam_open");
126 if (flag & RSETF_WRITE)
128 logf (LOG_FATAL, "ISAM set type is read-only");
131 ptinfo = xmalloc (sizeof(*ptinfo));
132 ptinfo->next = info->ispt_list;
133 info->ispt_list = ptinfo;
134 ptinfo->pt = is_position (info->is, info->pos);
139 static void r_close (RSFD rfd)
141 struct rset_isam_info *info = ((struct rset_ispt_info*) rfd)->info;
142 struct rset_ispt_info **ptinfop;
144 for (ptinfop = &info->ispt_list; *ptinfop; ptinfop = &(*ptinfop)->next)
147 is_pt_free ((*ptinfop)->pt);
148 *ptinfop = (*ptinfop)->next;
152 logf (LOG_FATAL, "r_close but no rfd match!");
156 static void r_delete (RSET ct)
158 struct rset_isam_info *info = ct->buf;
160 logf (LOG_DEBUG, "rsisam_delete");
161 assert (info->ispt_list == NULL);
165 static void r_rewind (RSFD rfd)
167 logf (LOG_DEBUG, "rsisam_rewind");
168 is_rewind( ((struct rset_ispt_info*) rfd)->pt);
171 static int r_count (RSET ct)
176 static int r_read (RSFD rfd, void *buf)
178 return is_readkey( ((struct rset_ispt_info*) rfd)->pt, buf);
181 static int r_write (RSFD rfd, const void *buf)
183 logf (LOG_FATAL, "ISAM set type is read-only");
187 static int r_score (RSFD rfd, int *score)