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% Licensed under the Apache License, Version 2.0 (the "License"); you may not
% use this file except in compliance with the License. You may obtain a copy of
% the License at
%
% http://www.apache.org/licenses/LICENSE-2.0
%
% Unless required by applicable law or agreed to in writing, software
% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
% License for the specific language governing permissions and limitations under
% the License.
-module(mango_cursor_special).
-export([
create/4,
explain/1,
execute/3
]).
-export([
handle_message/2
]).
-include_lib("couch/include/couch_db.hrl").
-include_lib("couch_mrview/include/couch_mrview.hrl").
-include("mango_cursor.hrl").
create(Db, Indexes, Selector, Opts) ->
InitialRange = mango_idx_view:field_ranges(Selector),
CatchAll = [{<<"_id">>, {'$gt', null, '$lt', mango_json_max}}],
% order matters here - we only want to use the catchall index
% if no other range can fulfill the query (because we know)
% catchall is the most expensive range
FieldRanges = InitialRange ++ CatchAll,
Composited = mango_cursor_view:composite_indexes(Indexes, FieldRanges),
{Index, IndexRanges} = mango_cursor_view:choose_best_index(Db, Composited),
Limit = couch_util:get_value(limit, Opts, mango_opts:default_limit()),
Skip = couch_util:get_value(skip, Opts, 0),
Fields = couch_util:get_value(fields, Opts, all_fields),
Bookmark = couch_util:get_value(bookmark, Opts),
IndexRanges1 = mango_cursor:maybe_noop_range(Selector, IndexRanges),
{ok, #cursor{
db = Db,
index = Index,
ranges = IndexRanges1,
selector = Selector,
opts = Opts,
limit = Limit,
skip = Skip,
fields = Fields,
bookmark = Bookmark
}}.
explain(Cursor) ->
mango_cursor_view:explain(Cursor).
execute(Cursor0, UserFun, UserAcc) ->
mango_cursor_view:execute(Cursor0, UserFun, UserAcc).
handle_message(Msg, Cursor) ->
mango_cursor_view:handle_message(Msg, Cursor).
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