2 * $Id: reclists.c,v 1.7 2007-01-15 04:34:28 quinn Exp $
11 #include <yaz/yaz-util.h>
16 extern struct parameters global_parameters;
19 static struct reclist_sortparms *sortparms = 0;
23 struct record_cluster *record;
24 struct reclist_bucket *next;
27 struct reclist_sortparms *reclist_parse_sortparms(NMEM nmem, const char *parms)
29 struct reclist_sortparms *res = 0;
30 struct reclist_sortparms **rp = &res;
31 struct conf_service *service = config->servers->service;
33 if (strlen(parms) > 256)
43 enum conf_sortkey_type type;
44 struct reclist_sortparms *new;
46 if (!(cpp = strchr(parms, ',')))
47 cpp = parms + strlen(parms);
48 strncpy(parm, parms, cpp - parms);
49 parm[cpp-parms] = '\0';
51 if ((pp = strchr(parm, ':')))
53 increasing = pp[1] == '1' ? 1 : 0;
58 if (!strcmp(parm, "relevance"))
60 type = Metadata_sortkey_relevance;
65 for (i = 0; i < service->num_sortkeys; i++)
67 struct conf_sortkey *sk = &service->sortkeys[i];
68 if (!strcmp(sk->name, parm))
71 if (type == Metadata_sortkey_skiparticle)
72 type = Metadata_sortkey_string;
76 if (i >= service->num_sortkeys)
78 yaz_log(YLOG_FATAL, "Bad sortkey: %s", parm);
84 new = *rp = nmem_malloc(nmem, sizeof(struct reclist_sortparms));
88 new->increasing = increasing;
96 static int reclist_cmp(const void *p1, const void *p2)
98 struct record_cluster *r1 = (*(struct record_cluster**) p1);
99 struct record_cluster *r2 = (*(struct record_cluster**) p2);
100 struct reclist_sortparms *s;
102 for (s = sortparms; s; s = s->next)
107 case Metadata_sortkey_relevance:
108 res = r2->relevance - r1->relevance;
110 case Metadata_sortkey_string:
111 res = strcmp(r2->sortkeys[s->offset]->text, r1->sortkeys[s->offset]->text);
113 case Metadata_sortkey_numeric:
117 yaz_log(YLOG_FATAL, "Bad sort type: %d", s->type);
130 void reclist_sort(struct reclist *l, struct reclist_sortparms *parms)
133 qsort(l->flatlist, l->num_records, sizeof(struct record_cluster*), reclist_cmp);
137 struct record_cluster *reclist_read_record(struct reclist *l)
139 if (l->pointer < l->num_records)
140 return l->flatlist[l->pointer++];
145 void reclist_rewind(struct reclist *l)
150 // Jenkins one-at-a-time hash (from wikipedia)
151 static unsigned int hash(const unsigned char *key)
153 unsigned int hash = 0;
158 hash += (hash << 10);
162 hash ^= (hash >> 11);
163 hash += (hash << 15);
167 struct reclist *reclist_create(NMEM nmem, int numrecs)
173 while (hashsize < numrecs)
175 res = nmem_malloc(nmem, sizeof(struct reclist));
176 res->hashtable = nmem_malloc(nmem, hashsize * sizeof(struct reclist_bucket*));
177 memset(res->hashtable, 0, hashsize * sizeof(struct reclist_bucket*));
178 res->hashtable_size = hashsize;
180 res->hashmask = hashsize - 1; // Creates a bitmask
182 res->num_records = 0;
183 res->flatlist = nmem_malloc(nmem, numrecs * sizeof(struct record_cluster*));
184 res->flatlist_size = numrecs;
189 // Insert a record. Return record cluster (newly formed or pre-existing)
190 struct record_cluster *reclist_insert(struct reclist *l, struct record *record,
191 char *merge_key, int *total)
194 struct reclist_bucket **p;
195 struct record_cluster *cluster = 0;
196 struct conf_service *service = global_parameters.server->service;
198 bucket = hash((unsigned char*) merge_key) & l->hashmask;
199 for (p = &l->hashtable[bucket]; *p; p = &(*p)->next)
201 // We found a matching record. Merge them
202 if (!strcmp(merge_key, (*p)->record->merge_key))
204 struct record_cluster *existing = (*p)->record;
205 record->next = existing->records;
206 existing->records = record;
211 if (!cluster && l->num_records < l->flatlist_size)
213 struct reclist_bucket *new =
214 nmem_malloc(l->nmem, sizeof(struct reclist_bucket));
215 struct record_cluster *newc =
216 nmem_malloc(l->nmem, sizeof(struct record_cluster));
221 newc->records = record;
222 newc->merge_key = merge_key;
224 newc->term_frequency_vec = 0;
225 newc->recid = (*total)++;
226 newc->metadata = nmem_malloc(l->nmem,
227 sizeof(struct record_metadata*) * service->num_metadata);
228 memset(newc->metadata, 0, sizeof(struct record_metadata*) * service->num_metadata);
229 newc->sortkeys = nmem_malloc(l->nmem,
230 sizeof(struct record_metadata*) * service->num_sortkeys);
231 memset(newc->sortkeys, 0, sizeof(union data_types*) * service->num_sortkeys);
234 l->flatlist[l->num_records++] = newc;
244 * indent-tabs-mode: nil
246 * vim: shiftwidth=4 tabstop=8 expandtab