2 * Copyright (C) 1994-1995, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.8 1995-09-08 14:52:27 adam
8 * Minor changes. Dictionary is lower case now.
10 * Revision 1.7 1995/09/07 13:58:36 adam
11 * New parameter: result-set file descriptor (RSFD) to support multiple
12 * positions within the same result-set.
13 * Boolean operators: and, or, not implemented.
14 * Result-set references.
16 * Revision 1.6 1995/09/06 16:11:18 adam
17 * Option: only one word key per file.
19 * Revision 1.5 1995/09/06 10:33:04 adam
20 * More work on present. Some log messages removed.
22 * Revision 1.4 1995/09/05 15:28:40 adam
23 * More work on search engine.
25 * Revision 1.3 1995/09/04 15:20:22 adam
28 * Revision 1.2 1995/09/04 12:33:43 adam
29 * Various cleanup. YAZ util used instead.
31 * Revision 1.1 1995/09/04 09:10:40 adam
32 * More work on index add/del/update.
33 * Merge sort implemented.
34 * Initial work on z39 server.
48 static RSET rpn_search_APT (ZServerInfo *zi, Z_AttributesPlusTerm *zapt)
50 char termz[IT_MAX_WORD+1];
52 struct rset_isam_parms parms;
55 Z_Term *term = zapt->term;
57 if (term->which != Z_Term_general)
59 sizez = term->u.general->len;
60 if (sizez > IT_MAX_WORD)
62 for (i = 0; i<sizez; i++)
63 termz[i] = index_char_cvt (term->u.general->buf[i]);
65 logf (LOG_DEBUG, "dict_lookup: %s", termz);
66 if (!(info = dict_lookup (zi->wordDict, termz)))
67 return rset_create (rset_kind_null, NULL);
68 assert (*info == sizeof(parms.pos));
69 memcpy (&parms.pos, info+1, sizeof(parms.pos));
70 parms.is = zi->wordIsam;
71 logf (LOG_DEBUG, "rset_create isam");
72 return rset_create (rset_kind_isam, &parms);
75 static RSET rpn_search_ref (ZServerInfo *zi, Z_ResultSetId *resultSetId)
79 if (!(s = resultSetGet (zi, resultSetId)))
80 return rset_create (rset_kind_null, NULL);
84 static RSET rpn_search_structure (ZServerInfo *zi, Z_RPNStructure *zs)
87 if (zs->which == Z_RPNStructure_complex)
89 rset_bool_parms bool_parms;
91 bool_parms.rset_l = rpn_search_structure (zi, zs->u.complex->s1);
92 bool_parms.rset_r = rpn_search_structure (zi, zs->u.complex->s2);
93 bool_parms.key_size = sizeof(struct it_key);
94 bool_parms.cmp = key_compare;
96 switch (zs->u.complex->operator->which)
99 r = rset_create (rset_kind_and, &bool_parms);
102 r = rset_create (rset_kind_or, &bool_parms);
104 case Z_Operator_and_not:
105 r = rset_create (rset_kind_not, &bool_parms);
111 else if (zs->which == Z_RPNStructure_simple)
113 if (zs->u.simple->which == Z_Operand_APT)
115 logf (LOG_DEBUG, "rpn_search_APT");
116 r = rpn_search_APT (zi, zs->u.simple->u.attributesPlusTerm);
118 else if (zs->u.simple->which == Z_Operand_resultSetId)
120 logf (LOG_DEBUG, "rpn_search_ref");
121 r = rpn_search_ref (zi, zs->u.simple->u.resultSetId);
135 static RSET rpn_save_set (RSET r, int *count)
139 rset_temp_parms parms;
145 logf (LOG_DEBUG, "rpn_save_set");
148 parms.key_size = sizeof(struct it_key);
149 d = rset_create (rset_kind_temp, &parms);
153 rfd = rset_open (r, 0);
154 while (rset_read (r, rfd, &key))
156 if (key.sysno != psysno)
162 rset_write (d, &key);
169 logf (LOG_DEBUG, "%d distinct sysnos", *count);
175 int rpn_search (ZServerInfo *zi,
176 Z_RPNQuery *rpn, int num_bases, char **basenames,
177 const char *setname, int *hits)
179 RSET rset, result_rset;
181 rset = rpn_search_structure (zi, rpn->RPNStructure);
184 result_rset = rpn_save_set (rset, hits);
186 rset_delete (result_rset);
189 resultSetAdd (zi, setname, 1, rset);