+ if (!rt)
+ return_code = YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS;
+ else
+ {
+ struct ZebraRecStream stream;
+ return_code = zebra_create_record_stream(zh, &rec, &stream);
+ if (return_code == 0)
+ {
+ extract_snippet(zh, snippets, &stream,
+ rt, recTypeClientData);
+
+ stream.destroy(&stream);
+ }
+ }
+ rec_free(&rec);
+ }
+ return return_code;
+}
+
+static int snippet_fetch(
+ struct special_fetch_s *fi, const char *elemsetname,
+ const Odr_oid *input_format,
+ const Odr_oid **output_format,
+ WRBUF result, WRBUF addinfo)
+{
+ ZebraHandle zh = fi->zh;
+ zebra_snippets *rec_snippets = zebra_snippets_create();
+ int return_code = zebra_get_rec_snippets(zh, fi->sysno, rec_snippets);
+
+ if (!return_code)
+ {
+ WRBUF wrbuf = result;
+ zebra_snippets *hit_snippet = zebra_snippets_create();
+
+ zebra_snippets_hit_vector(zh, fi->setname, fi->sysno, hit_snippet);
+
+#if 0
+ /* for debugging purposes */
+ yaz_log(YLOG_LOG, "---------------------------");
+ yaz_log(YLOG_LOG, "REC SNIPPET:");
+ zebra_snippets_log(rec_snippets, YLOG_LOG, 1);
+ yaz_log(YLOG_LOG, "---------------------------");
+ yaz_log(YLOG_LOG, "HIT SNIPPET:");
+ zebra_snippets_log(hit_snippet, YLOG_LOG, 1);
+#endif
+
+ zebra_snippets_ring(rec_snippets, hit_snippet, 5, 5);
+
+#if 0
+ yaz_log(YLOG_LOG, "---------------------------");
+ yaz_log(YLOG_LOG, "RING SNIPPET:");
+ zebra_snippets_log(rec_snippets, YLOG_LOG, 1);
+#endif
+ snippet_xml_record(zh, wrbuf, rec_snippets);
+
+ *output_format = yaz_oid_recsyn_xml;
+
+ zebra_snippets_destroy(hit_snippet);
+ }
+ zebra_snippets_destroy(rec_snippets);
+ return return_code;
+}
+
+struct term_collect {
+ const char *term;
+ int oc;
+ zint set_occur;
+};
+
+static zint freq_term(ZebraHandle zh, int ord, const char *term, RSET rset_set)
+{
+ struct rset_key_control *kc = zebra_key_control_create(zh);
+ char ord_buf[IT_MAX_WORD];
+ int ord_len = key_SU_encode(ord, ord_buf);
+ char *info;
+ zint hits = 0;
+ NMEM nmem = nmem_create();
+
+ strcpy(ord_buf + ord_len, term);
+
+ info = dict_lookup(zh->reg->dict, ord_buf);
+ if (info)
+ {
+ ISAM_P isam_p;
+ RSET rsets[2], rset;
+ memcpy(&isam_p, info+1, sizeof(ISAM_P));
+
+ rsets[0] = zebra_create_rset_isam(zh, nmem, kc, kc->scope, isam_p, 0);
+ rsets[1] = rset_dup(rset_set);
+
+ rset = rset_create_and(nmem, kc, kc->scope, 2, rsets);
+
+ zebra_count_set(zh, rset, &hits, zh->approx_limit);
+
+ rset_delete(rsets[0]);
+ rset_delete(rset);
+ }
+ (*kc->dec)(kc);
+ nmem_destroy(nmem);
+ return hits;
+}
+
+static int term_qsort_handle(const void *a, const void *b)
+{
+ const struct term_collect *l = a;
+ const struct term_collect *r = b;
+ if (l->set_occur < r->set_occur)
+ return 1;
+ else if (l->set_occur > r->set_occur)
+ return -1;
+ else
+ {
+ const char *lterm = l->term ? l->term : "";
+ const char *rterm = r->term ? r->term : "";
+ return strcmp(lterm, rterm);
+ }
+}
+
+static void term_collect_freq(ZebraHandle zh,
+ struct term_collect *col, int no_terms_collect,
+ int ord, RSET rset, double scale_factor)
+{
+ int i;
+ for (i = 0; i < no_terms_collect; i++)
+ {
+ if (col[i].term)
+ {
+ if (scale_factor < 0.0)
+ {
+ col[i].set_occur = freq_term(zh, ord, col[i].term, rset);
+ }
+ else
+ col[i].set_occur = scale_factor * col[i].oc;
+ }
+ }
+ qsort(col, no_terms_collect, sizeof(*col), term_qsort_handle);
+}