2 * Copyright (C) 1994-1995, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.7 1995-09-07 13:58:36 adam
8 * New parameter: result-set file descriptor (RSFD) to support multiple
9 * positions within the same result-set.
10 * Boolean operators: and, or, not implemented.
11 * Result-set references.
13 * Revision 1.6 1995/09/06 16:11:18 adam
14 * Option: only one word key per file.
16 * Revision 1.5 1995/09/06 10:33:04 adam
17 * More work on present. Some log messages removed.
19 * Revision 1.4 1995/09/05 15:28:40 adam
20 * More work on search engine.
22 * Revision 1.3 1995/09/04 15:20:22 adam
25 * Revision 1.2 1995/09/04 12:33:43 adam
26 * Various cleanup. YAZ util used instead.
28 * Revision 1.1 1995/09/04 09:10:40 adam
29 * More work on index add/del/update.
30 * Merge sort implemented.
31 * Initial work on z39 server.
45 static RSET rpn_search_APT (ZServerInfo *zi, Z_AttributesPlusTerm *zapt)
49 struct rset_isam_parms parms;
51 Z_Term *term = zapt->term;
53 if (term->which != Z_Term_general)
55 sizez = term->u.general->len;
58 memcpy (termz, term->u.general->buf, sizez);
60 logf (LOG_DEBUG, "dict_lookup: %s", termz);
61 if (!(info = dict_lookup (zi->wordDict, termz)))
62 return rset_create (rset_kind_null, NULL);
63 assert (*info == sizeof(parms.pos));
64 memcpy (&parms.pos, info+1, sizeof(parms.pos));
65 parms.is = zi->wordIsam;
66 logf (LOG_DEBUG, "rset_create isam");
67 return rset_create (rset_kind_isam, &parms);
70 static RSET rpn_search_ref (ZServerInfo *zi, Z_ResultSetId *resultSetId)
74 if (!(s = resultSetGet (zi, resultSetId)))
75 return rset_create (rset_kind_null, NULL);
79 static RSET rpn_search_structure (ZServerInfo *zi, Z_RPNStructure *zs)
82 if (zs->which == Z_RPNStructure_complex)
84 rset_bool_parms bool_parms;
86 bool_parms.rset_l = rpn_search_structure (zi, zs->u.complex->s1);
87 bool_parms.rset_r = rpn_search_structure (zi, zs->u.complex->s2);
88 bool_parms.key_size = sizeof(struct it_key);
89 bool_parms.cmp = key_compare;
91 switch (zs->u.complex->operator->which)
94 r = rset_create (rset_kind_and, &bool_parms);
97 r = rset_create (rset_kind_or, &bool_parms);
99 case Z_Operator_and_not:
100 r = rset_create (rset_kind_not, &bool_parms);
106 else if (zs->which == Z_RPNStructure_simple)
108 if (zs->u.simple->which == Z_Operand_APT)
110 logf (LOG_DEBUG, "rpn_search_APT");
111 r = rpn_search_APT (zi, zs->u.simple->u.attributesPlusTerm);
113 else if (zs->u.simple->which == Z_Operand_resultSetId)
115 logf (LOG_DEBUG, "rpn_search_ref");
116 r = rpn_search_ref (zi, zs->u.simple->u.resultSetId);
130 static RSET rpn_save_set (RSET r, int *count)
134 rset_temp_parms parms;
140 logf (LOG_DEBUG, "rpn_save_set");
143 parms.key_size = sizeof(struct it_key);
144 d = rset_create (rset_kind_temp, &parms);
148 rfd = rset_open (r, 0);
149 while (rset_read (r, rfd, &key))
151 if (key.sysno != psysno)
157 rset_write (d, &key);
164 logf (LOG_DEBUG, "%d distinct sysnos", *count);
170 int rpn_search (ZServerInfo *zi,
171 Z_RPNQuery *rpn, int num_bases, char **basenames,
172 const char *setname, int *hits)
174 RSET rset, result_rset;
176 rset = rpn_search_structure (zi, rpn->RPNStructure);
179 result_rset = rpn_save_set (rset, hits);
181 rset_delete (result_rset);
184 resultSetAdd (zi, setname, 1, rset);