2 * $Id: reclists.c,v 1.6 2007-01-10 10:04:23 adam Exp $
11 #include <yaz/yaz-util.h>
16 extern struct parameters global_parameters;
20 struct record_cluster *record;
21 struct reclist_bucket *next;
24 struct record_cluster *reclist_read_record(struct reclist *l)
26 if (l->pointer < l->num_records)
27 return l->flatlist[l->pointer++];
32 void reclist_rewind(struct reclist *l)
37 // Jenkins one-at-a-time hash (from wikipedia)
38 static unsigned int hash(const unsigned char *key)
40 unsigned int hash = 0;
54 struct reclist *reclist_create(NMEM nmem, int numrecs)
60 while (hashsize < numrecs)
62 res = nmem_malloc(nmem, sizeof(struct reclist));
63 res->hashtable = nmem_malloc(nmem, hashsize * sizeof(struct reclist_bucket*));
64 memset(res->hashtable, 0, hashsize * sizeof(struct reclist_bucket*));
65 res->hashtable_size = hashsize;
67 res->hashmask = hashsize - 1; // Creates a bitmask
70 res->flatlist = nmem_malloc(nmem, numrecs * sizeof(struct record_cluster*));
71 res->flatlist_size = numrecs;
76 // Insert a record. Return record cluster (newly formed or pre-existing)
77 struct record_cluster *reclist_insert(struct reclist *l, struct record *record,
78 char *merge_key, int *total)
81 struct reclist_bucket **p;
82 struct record_cluster *cluster = 0;
83 struct conf_service *service = global_parameters.server->service;
85 bucket = hash((unsigned char*) merge_key) & l->hashmask;
86 for (p = &l->hashtable[bucket]; *p; p = &(*p)->next)
88 // We found a matching record. Merge them
89 if (!strcmp(merge_key, (*p)->record->merge_key))
91 struct record_cluster *existing = (*p)->record;
92 record->next = existing->records;
93 existing->records = record;
98 if (!cluster && l->num_records < l->flatlist_size)
100 struct reclist_bucket *new =
101 nmem_malloc(l->nmem, sizeof(struct reclist_bucket));
102 struct record_cluster *newc =
103 nmem_malloc(l->nmem, sizeof(struct record_cluster));
108 newc->records = record;
109 newc->merge_key = merge_key;
111 newc->term_frequency_vec = 0;
112 newc->recid = (*total)++;
114 newc->metadata = nmem_malloc(l->nmem,
115 sizeof(struct record_metadata*) * service->num_metadata);
116 memset(newc->metadata, 0, sizeof(struct record_metadata*) * service->num_metadata);
119 l->flatlist[l->num_records++] = newc;
129 * indent-tabs-mode: nil
131 * vim: shiftwidth=4 tabstop=8 expandtab