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-module(sh_db_query).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% TYPES %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-record
(
set_field,
{
field :: non_neg_integer(),
value :: any()
}
).
-record
(
add_to_field,
{
field :: non_neg_integer(),
values :: list(any()),
head :: boolean()
}
).
-record
(
update_indexed,
{
field :: non_neg_integer(),
ix :: non_neg_integer(),
ops :: list(db_query_op())
}
).
-record
(
set_perm,
{
perm :: sh_db_user:permission()
}
).
-record
(
set_val,
{
val :: any()
}
).
-record
(
db_query,
{
db :: atom(),
id :: any(),
user :: db_user:user(),
ops :: list(db_query_master_op())
}
).
-type db_query_op() :: (#set_field{} | #add_to_field{} | #update_indexed{}).
-type db_query_master_op() :: (db_query_op() | #set_perm{} | #set_val{}).
-type db_query() :: #db_query{}.
-opaque op() :: db_query_op().
-opaque type() :: db_query().
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% EXPORTS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-export_type([type/0, op/0]).
-export
(
[
new/4,
set_field/2,
add_to_field/2,
update_indexed/3
]
).
-export
(
[
get_database/1,
get_entry_id/1
]
).
-export([apply_to/2]).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% LOCAL FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-spec get_user (db_query()) -> sh_db_user:user().
get_user (#db_query{ user = Result }) -> Result.
-spec apply_update_indexed (#update_indexed{}, any()) -> any().
apply_update_indexed (Op, Elem) ->
FieldNumber = Op#update_indexed.field,
IX = Op#update_indexed.ix,
Ops = Op#update_indexed.ops,
IndexedFieldValue = element(FieldNumber, Elem),
ArrayValue = array:get(IX, IndexedFieldValue),
UpdatedArrayValue = lists:foldl(fun apply_op_to/2, ArrayValue, Ops),
UpdatedIndexedFieldValue =
array:set(IX, UpdatedArrayValue, IndexedFieldValue),
setelement(FieldNumber, Elem, UpdatedIndexedFieldValue).
-spec apply_add_to_field (#add_to_field{}, any()) -> any().
apply_add_to_field (Op, Elem) ->
FieldNumber = Op#add_to_field.field,
NewValues = Op#add_to_field.values,
AddToHead = Op#add_to_field.head,
CurrentValues = element(FieldNumber, Elem),
UpdatedValues =
case AddToHead of
true -> (NewValues ++ CurrentValues);
_ -> (CurrentValues ++ NewValues)
end,
setelement(FieldNumber, Elem, UpdatedValues).
-spec apply_set_field (#set_field{}, any()) -> any().
apply_set_field (Op, Elem) ->
FieldNumber = Op#set_field.field,
NewValue = Op#set_field.value,
setelement(FieldNumber, Elem, NewValue).
-spec apply_op_to (db_query_op(), any()) -> any().
apply_op_to (Op, Elem) when is_record(Op, set_field) ->
apply_set_field(Op, Elem);
apply_op_to (Op, Elem) when is_record(Op, add_to_field) ->
apply_add_to_field(Op, Elem);
apply_op_to (Op, Elem) when is_record(Op, update_indexed) ->
apply_update_indexed(Op, Elem).
-spec apply_master_op_to
(
db_query_master_op(),
sh_db_item:type()
)
-> sh_db_item:type().
apply_master_op_to (MOp, Elem) when is_record(MOp, set_perm) ->
NewPerm = MOp#set_perm.perm,
sh_db_item:set_perm(NewPerm, Elem);
apply_master_op_to (MOp, Elem) when is_record(MOp, set_val) ->
NewVal = MOp#set_val.val,
sh_db_item:set_value(NewVal, Elem);
apply_master_op_to (MOp, Elem) ->
OldValue = sh_db_item:get_value(Elem),
NewValue = apply_op_to(MOp, OldValue),
sh_db_item:set_value(NewValue, Elem).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% EXPORTED FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-spec new (atom(), any(), sh_db_user:user(), list(op())) -> type().
new (DBName, ObjectID, User, Ops) ->
#db_query
{
db = DBName,
id = ObjectID,
user = User,
ops = Ops
}.
-spec set_field (non_neg_integer(), any()) -> op().
set_field (Field, Value) ->
#set_field { field = Field, value = Value }.
-spec add_to_field (non_neg_integer(), list(any())) -> op().
add_to_field (Field, Values) ->
#add_to_field { field = Field, values = Values }.
-spec update_indexed
(
non_neg_integer(),
non_neg_integer(),
list(op())
)
-> op().
update_indexed (Field, IX, Updates) ->
#update_indexed { field = Field, ix = IX, ops = Updates}.
-spec get_database (db_query()) -> atom().
get_database (#db_query{ db = Result }) -> Result.
-spec get_entry_id (db_query()) -> any().
get_entry_id (#db_query{ id = Result }) -> Result.
-spec apply_to
(
db_query(),
sh_db_item:type()
)
-> ({'ok', sh_db_item:type()} | 'error').
apply_to (DBQuery, DBItem) ->
true =
sh_db_user:can_access
(
sh_db_item:get_permission(DBItem),
get_user(DBQuery)
),
MOps = DBQuery#db_query.ops,
{ok, lists:foldl(fun apply_master_op_to/2, DBItem, MOps)}.
|
