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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_idx_special).
-export([
validate/1,
add/2,
remove/2,
from_ddoc/1,
to_json/1,
columns/1,
is_usable/3,
start_key/1,
end_key/1
]).
-include_lib("couch/include/couch_db.hrl").
-include("mango_idx.hrl").
validate(_) ->
erlang:exit(invalid_call).
add(_, _) ->
erlang:exit(invalid_call).
remove(_, _) ->
erlang:exit(invalid_call).
from_ddoc(_) ->
erlang:exit(invalid_call).
to_json(#idx{def=all_docs}) ->
{[
{ddoc, null},
{name, <<"_all_docs">>},
{type, <<"special">>},
{def, {[
{<<"fields">>, [{[
{<<"_id">>, <<"asc">>}
]}]}
]}}
]}.
columns(#idx{def=all_docs}) ->
[<<"_id">>].
is_usable(#idx{def=all_docs}, _Selector, []) ->
true;
is_usable(#idx{def=all_docs} = Idx, Selector, SortFields) ->
Fields = mango_idx_view:indexable_fields(Selector),
lists:member(<<"_id">>, Fields) and can_use_sort(Idx, SortFields, Selector).
start_key([{'$gt', Key, _, _}]) ->
case mango_json:special(Key) of
true ->
?MIN_STR;
false ->
Key
end;
start_key([{'$gte', Key, _, _}]) ->
false = mango_json:special(Key),
Key;
start_key([{'$eq', Key, '$eq', Key}]) ->
false = mango_json:special(Key),
Key.
end_key([{_, _, '$lt', Key}]) ->
case mango_json:special(Key) of
true ->
?MAX_STR;
false ->
Key
end;
end_key([{_, _, '$lte', Key}]) ->
false = mango_json:special(Key),
Key;
end_key([{'$eq', Key, '$eq', Key}]) ->
false = mango_json:special(Key),
Key.
can_use_sort(_Idx, [], _Selector) ->
true;
can_use_sort(Idx, SortFields, _Selector) ->
Cols = columns(Idx),
lists:prefix(SortFields, Cols).
|
