+ ident_data_to_json__data_t *data = user_data;
+ size_t i;
+
+ double first_value_time_double;
+ double interval_double;
+ double interval_requested;
+ size_t points_consolidate;
+
+ first_value_time_double = ((double) first_value_time.tv_sec)
+ + (((double) first_value_time.tv_nsec) / 1000000000.0);
+ interval_double = ((double) interval.tv_sec)
+ + (((double) interval.tv_nsec) / 1000000000.0);
+ interval_requested = ((double) data->interval.tv_sec)
+ + (((double) data->interval.tv_nsec) / 1000000000.0);
+
+ if (interval_requested < (2.0 * interval_double))
+ points_consolidate = 1;
+ else
+ points_consolidate = (size_t) (interval_requested / interval_double);
+ assert (points_consolidate >= 1);
+
+ if (points_consolidate > 1)
+ {
+ size_t offset = data_points_num % points_consolidate;
+
+ first_value_time_double += ((double) offset) * interval_double;
+ interval_double *= ((double) points_consolidate);
+ }
+
+ yajl_gen_map_open (data->handler);
+
+ yajl_gen_string_cast (data->handler, "first_value_time", strlen ("first_value_time"));
+ yajl_gen_double (data->handler, first_value_time_double);
+
+ yajl_gen_string_cast (data->handler, "interval", strlen ("interval"));
+ yajl_gen_double (data->handler, interval_double);
+
+ yajl_gen_string_cast (data->handler, "data", strlen ("data"));
+ yajl_gen_array_open (data->handler);
+
+ for (i = (data_points_num % points_consolidate);
+ i < data_points_num;
+ i += points_consolidate)
+ {
+ size_t j;
+
+ double sum = 0.0;
+ long num = 0;
+
+ for (j = 0; j < points_consolidate; j++)
+ {
+ if (isnan (data_points[i+j]))
+ continue;
+
+ sum += data_points[i+j];
+ num++;
+ }
+
+ if (num == 0)
+ yajl_gen_null (data->handler);
+ else
+ yajl_gen_double (data->handler, sum / ((double) num));
+ }
+
+ yajl_gen_array_close (data->handler);
+
+ return (0);
+} /* }}} int ident_data_to_json__get_ident_data */
+
+/* Called for each DS name */
+static int ident_data_to_json__get_ds_name (graph_ident_t *ident, /* {{{ */
+ const char *ds_name, void *user_data)
+{
+ ident_data_to_json__data_t *data = user_data;
+ int status;
+
+ yajl_gen_map_open (data->handler);
+
+ yajl_gen_string_cast (data->handler, "file", strlen ("file"));
+ ident_to_json (ident, data->handler);
+
+ yajl_gen_string_cast (data->handler, "data_source", strlen ("data_source"));
+ yajl_gen_string_cast (data->handler, ds_name, strlen (ds_name));
+
+ status = data_provider_get_ident_data (ident, ds_name,
+ data->begin, data->end,
+ ident_data_to_json__get_ident_data,
+ data);
+
+ yajl_gen_map_close (data->handler);
+
+ return (status);
+} /* }}} int ident_data_to_json__get_ds_name */
+
+int ident_data_to_json (graph_ident_t *ident, /* {{{ */
+ dp_time_t begin, dp_time_t end, dp_time_t res,
+ yajl_gen handler)
+{
+ ident_data_to_json__data_t data;
+ int status;
+
+ data.begin = begin;
+ data.end = end;
+ data.interval = res;
+ data.handler = handler;
+
+ /* Iterate over all DS names */
+ status = data_provider_get_ident_ds_names (ident,
+ ident_data_to_json__get_ds_name, &data);
+ if (status != 0)
+ fprintf (stderr, "ident_data_to_json: data_provider_get_ident_ds_names "
+ "failed with status %i\n", status);
+
+ return (status);
+} /* }}} int ident_data_to_json */
+/* }}} ident_data_to_json */
+
+int ident_describe (const graph_ident_t *ident, /* {{{ */
+ const graph_ident_t *selector,
+ char *buffer, size_t buffer_size)
+{
+ if ((ident == NULL) || (selector == NULL)
+ || (buffer == NULL) || (buffer_size < 2))
+ return (EINVAL);