2 * Copyright (C) 1994-1995, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.9 1995-09-11 13:09:35 adam
8 * More work on relevance feedback.
10 * Revision 1.8 1995/09/08 14:52:27 adam
11 * Minor changes. Dictionary is lower case now.
13 * Revision 1.7 1995/09/07 13:58:36 adam
14 * New parameter: result-set file descriptor (RSFD) to support multiple
15 * positions within the same result-set.
16 * Boolean operators: and, or, not implemented.
17 * Result-set references.
19 * Revision 1.6 1995/09/06 16:11:18 adam
20 * Option: only one word key per file.
22 * Revision 1.5 1995/09/06 10:33:04 adam
23 * More work on present. Some log messages removed.
25 * Revision 1.4 1995/09/05 15:28:40 adam
26 * More work on search engine.
28 * Revision 1.3 1995/09/04 15:20:22 adam
31 * Revision 1.2 1995/09/04 12:33:43 adam
32 * Various cleanup. YAZ util used instead.
34 * Revision 1.1 1995/09/04 09:10:40 adam
35 * More work on index add/del/update.
36 * Merge sort implemented.
37 * Initial work on z39 server.
52 int split_term (ZServerInfo *zi, Z_Term *term, ISAM_P **isam_ps, int *no)
54 static ISAM_P isam_p[16];
56 char termz[IT_MAX_WORD+1];
57 char term_sub[IT_MAX_WORD+1];
62 if (term->which != Z_Term_general)
64 sizez = term->u.general->len;
65 if (sizez > IT_MAX_WORD)
67 for (i = 0; i<sizez; i++)
68 termz[i] = index_char_cvt (term->u.general->buf[i]);
74 if ((p1 = strchr (p0, ' ')))
76 memcpy (term_sub, p0, p1-p0);
77 term_sub[p1-p0] = '\0';
80 strcpy (term_sub, p0);
81 logf (LOG_DEBUG, "dict_lookup: %s", term_sub);
82 if ((info = dict_lookup (zi->wordDict, term_sub)))
84 logf (LOG_DEBUG, " found");
85 assert (*info == sizeof(*isam_p));
86 memcpy (isam_p + isam_p_indx, info+1, sizeof(*isam_p));
95 logf (LOG_DEBUG, "%d positions", *no);
99 static RSET rpn_search_APT_relevance (ZServerInfo *zi,
100 Z_AttributesPlusTerm *zapt)
102 rset_relevance_parms parms;
104 parms.key_size = sizeof(struct it_key);
106 parms.cmp = key_compare;
107 parms.is = zi->wordIsam;
108 split_term (zi, zapt->term, &parms.isam_positions,
109 &parms.no_isam_positions);
110 if (parms.no_isam_positions > 0)
111 return rset_create (rset_kind_relevance, &parms);
113 return rset_create (rset_kind_null, NULL);
116 static RSET rpn_search_APT (ZServerInfo *zi, Z_AttributesPlusTerm *zapt)
119 Z_Term *term = zapt->term;
120 char termz[IT_MAX_WORD+1];
122 struct rset_isam_parms parms;
126 if (term->which != Z_Term_general)
128 sizez = term->u.general->len;
129 if (sizez > IT_MAX_WORD)
131 for (i = 0; i<sizez; i++)
132 termz[i] = index_char_cvt (term->u.general->buf[i]);
134 logf (LOG_DEBUG, "dict_lookup: %s", termz);
135 if (!(info = dict_lookup (zi->wordDict, termz)))
136 return rset_create (rset_kind_null, NULL);
137 assert (*info == sizeof(parms.pos));
138 memcpy (&parms.pos, info+1, sizeof(parms.pos));
139 parms.is = zi->wordIsam;
140 logf (LOG_DEBUG, "rset_create isam");
141 return rset_create (rset_kind_isam, &parms);
143 return rpn_search_APT_relevance (zi, zapt);
147 static RSET rpn_search_ref (ZServerInfo *zi, Z_ResultSetId *resultSetId)
151 if (!(s = resultSetGet (zi, resultSetId)))
152 return rset_create (rset_kind_null, NULL);
156 static RSET rpn_search_structure (ZServerInfo *zi, Z_RPNStructure *zs)
159 if (zs->which == Z_RPNStructure_complex)
161 rset_bool_parms bool_parms;
163 bool_parms.rset_l = rpn_search_structure (zi, zs->u.complex->s1);
164 bool_parms.rset_r = rpn_search_structure (zi, zs->u.complex->s2);
165 bool_parms.key_size = sizeof(struct it_key);
166 bool_parms.cmp = key_compare;
168 switch (zs->u.complex->operator->which)
171 r = rset_create (rset_kind_and, &bool_parms);
174 r = rset_create (rset_kind_or, &bool_parms);
176 case Z_Operator_and_not:
177 r = rset_create (rset_kind_not, &bool_parms);
183 else if (zs->which == Z_RPNStructure_simple)
185 if (zs->u.simple->which == Z_Operand_APT)
187 logf (LOG_DEBUG, "rpn_search_APT");
188 r = rpn_search_APT (zi, zs->u.simple->u.attributesPlusTerm);
190 else if (zs->u.simple->which == Z_Operand_resultSetId)
192 logf (LOG_DEBUG, "rpn_search_ref");
193 r = rpn_search_ref (zi, zs->u.simple->u.resultSetId);
207 static RSET rpn_save_set (RSET r, int *count)
211 rset_temp_parms parms;
217 logf (LOG_DEBUG, "rpn_save_set");
220 parms.key_size = sizeof(struct it_key);
221 d = rset_create (rset_kind_temp, &parms);
225 rfd = rset_open (r, 0);
226 while (rset_read (r, rfd, &key))
228 if (key.sysno != psysno)
234 rset_write (d, &key);
241 logf (LOG_DEBUG, "%d distinct sysnos", *count);
247 int rpn_search (ZServerInfo *zi,
248 Z_RPNQuery *rpn, int num_bases, char **basenames,
249 const char *setname, int *hits)
251 RSET rset, result_rset;
253 rset = rpn_search_structure (zi, rpn->RPNStructure);
256 result_rset = rpn_save_set (rset, hits);
258 rset_delete (result_rset);
261 resultSetAdd (zi, setname, 1, rset);