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/*
Copyright(C) 2016 Brazil
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
typedef enum {
GRN_WINDOW_DIRECTION_ASCENDING,
GRN_WINDOW_DIRECTION_DESCENDING
} grn_window_direction;
typedef struct _grn_window grn_window;
GRN_API grn_id grn_window_next(grn_ctx *ctx,
grn_window *window);
GRN_API grn_rc grn_window_rewind(grn_ctx *ctx,
grn_window *window);
GRN_API grn_rc grn_window_set_direction(grn_ctx *ctx,
grn_window *window,
grn_window_direction direction);
GRN_API grn_obj *grn_window_get_table(grn_ctx *ctx,
grn_window *window);
GRN_API grn_bool grn_window_is_sorted(grn_ctx *ctx,
grn_window *window);
GRN_API size_t grn_window_get_size(grn_ctx *ctx,
grn_window *window);
typedef struct _grn_window_definition {
grn_table_sort_key *sort_keys;
size_t n_sort_keys;
grn_table_sort_key *group_keys;
size_t n_group_keys;
} grn_window_definition;
typedef grn_rc grn_window_function_func(grn_ctx *ctx,
grn_obj *output_column,
grn_window *window,
grn_obj **args,
int n_args);
GRN_API grn_obj *grn_window_function_create(grn_ctx *ctx,
const char *name,
int name_size,
grn_window_function_func func);
GRN_API grn_rc grn_table_apply_window_function(grn_ctx *ctx,
grn_obj *table,
grn_obj *output_column,
grn_window_definition *definition,
grn_obj *window_function_call);
#ifdef __cplusplus
}
#endif
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