%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2011-2012. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
-module(observer_tv_table).
-export([start_link/2]).
%% wx_object callbacks
-export([init/1, handle_info/2, terminate/2, code_change/3, handle_call/3,
handle_event/2, handle_sync_event/3, handle_cast/2]).
-include("observer_defs.hrl").
-import(observer_lib, [to_str/1]).
-behaviour(wx_object).
-include_lib("wx/include/wx.hrl").
-include("observer_tv.hrl").
-define(ID_TABLE_INFO, 400).
-define(ID_REFRESH, 401).
-define(ID_REFRESH_INTERVAL, 402).
-define(ID_EDIT, 403).
-define(ID_DELETE, 404).
-define(ID_SEARCH, 405).
-define(SEARCH_ENTRY, 420).
-define(GOTO_ENTRY, 421).
-define(DEFAULT_COL_WIDTH, 150).
-record(state,
{
parent,
frame,
grid,
status,
sizer,
search,
selected,
node=node(),
columns,
pid,
source,
tab,
attrs,
timer
}).
-record(opt,
{
sort_key=2,
sort_incr=true
}).
-record(search,
{enable=true, % Subwindow is enabled
win, % Sash Sub window obj
name, % name
search, % Search input ctrl
goto, % Goto input ctrl
radio, % Radio buttons
find % Search string
}).
-record(find, {start, % start pos
strlen, % Found
found % false
}).
start_link(Parent, Opts) ->
wx_object:start_link(?MODULE, [Parent, Opts], []).
init([Parent, Opts]) ->
Source = proplists:get_value(type, Opts),
Table = proplists:get_value(table, Opts),
Node = proplists:get_value(node, Opts),
Title0 = atom_to_list(Table#tab.name) ++ " @ " ++ atom_to_list(Node),
Title = case Source of
ets -> "TV Ets: " ++ Title0;
mnesia -> "TV Mnesia: " ++ Title0
end,
Frame = wxFrame:new(Parent, ?wxID_ANY, Title, [{size, {800, 300}}]),
IconFile = filename:join(code:priv_dir(observer), "erlang_observer.png"),
Icon = wxIcon:new(IconFile, [{type,?wxBITMAP_TYPE_PNG}]),
wxFrame:setIcon(Frame, Icon),
wxIcon:destroy(Icon),
MenuBar = wxMenuBar:new(),
create_menus(MenuBar),
wxFrame:setMenuBar(Frame, MenuBar),
%% wxFrame:setAcceleratorTable(Frame, AccelTable),
wxMenu:connect(Frame, command_menu_selected),
StatusBar = wxFrame:createStatusBar(Frame, []),
try
TabId = table_id(Table),
ColumnNames = column_names(Node, Source, TabId),
KeyPos = key_pos(Node, Source, TabId),
Attrs = observer_lib:create_attrs(),
Self = self(),
Holder = spawn_link(fun() ->
init_table_holder(Self, Table, Source,
length(ColumnNames), Node, Attrs)
end),
Panel = wxPanel:new(Frame),
Sizer = wxBoxSizer:new(?wxVERTICAL),
Style = ?wxLC_REPORT bor ?wxLC_VIRTUAL bor ?wxLC_SINGLE_SEL bor ?wxLC_HRULES,
Grid = wxListCtrl:new(Panel, [{style, Style},
{onGetItemText,
fun(_, Item,Col) -> get_row(Holder, Item, Col+1) end},
{onGetItemAttr,
fun(_, Item) -> get_attr(Holder, Item) end}
]),
wxListCtrl:connect(Grid, command_list_item_activated),
wxListCtrl:connect(Grid, command_list_item_selected),
wxListCtrl:connect(Grid, command_list_col_click),
wxListCtrl:connect(Grid, size, [{skip, true}]),
wxWindow:setFocus(Grid),
Search = search_area(Panel),
wxSizer:add(Sizer, Grid,
[{flag, ?wxEXPAND bor ?wxALL}, {proportion, 1}, {border, 5}]),
wxSizer:add(Sizer, Search#search.win,
[{flag,?wxEXPAND bor ?wxLEFT bor ?wxRIGHT bor
?wxRESERVE_SPACE_EVEN_IF_HIDDEN},
{border, 5}]),
wxWindow:setSizer(Panel, Sizer),
wxSizer:hide(Sizer, Search#search.win),
Cols = add_columns(Grid, 0, ColumnNames),
wxFrame:show(Frame),
{Panel, #state{frame=Frame, grid=Grid, status=StatusBar, search=Search,
sizer = Sizer,
parent=Parent, columns=Cols,
pid=Holder, source=Source, tab=Table#tab{keypos=KeyPos},
attrs=Attrs}}
catch node_or_table_down ->
wxFrame:destroy(Frame),
stop
end.
add_columns(Grid, Start, ColumnNames) ->
Li = wxListItem:new(),
AddListEntry = fun(Name, Col) ->
wxListItem:setText(Li, to_str(Name)),
wxListItem:setAlign(Li, ?wxLIST_FORMAT_LEFT),
wxListCtrl:insertColumn(Grid, Col, Li),
wxListCtrl:setColumnWidth(Grid, Col, ?DEFAULT_COL_WIDTH),
Col + 1
end,
Cols = lists:foldl(AddListEntry, Start, ColumnNames),
wxListItem:destroy(Li),
Cols.
create_menus(MB) ->
File = wxMenu:new(),
wxMenu:append(File, ?ID_TABLE_INFO, "Table Information\tCtrl-I"),
wxMenu:append(File, ?wxID_CLOSE, "Close"),
wxMenuBar:append(MB, File, "File"),
Edit = wxMenu:new(),
wxMenu:append(Edit, ?ID_EDIT, "Edit Object"),
wxMenu:append(Edit, ?ID_DELETE, "Delete Object\tCtrl-D"),
wxMenu:appendSeparator(Edit),
wxMenu:append(Edit, ?ID_SEARCH, "Search\tCtrl-S"),
wxMenu:appendSeparator(Edit),
wxMenu:append(Edit, ?ID_REFRESH, "Refresh\tCtrl-R"),
wxMenu:append(Edit, ?ID_REFRESH_INTERVAL, "Refresh interval..."),
wxMenuBar:append(MB, Edit, "Edit"),
Help = wxMenu:new(),
wxMenu:append(Help, ?wxID_HELP, "Help"),
wxMenuBar:append(MB, Help, "Help"),
ok.
search_area(Parent) ->
HSz = wxBoxSizer:new(?wxHORIZONTAL),
wxSizer:add(HSz, wxStaticText:new(Parent, ?wxID_ANY, "Find:"),
[{flag,?wxALIGN_CENTER_VERTICAL}]),
TC1 = wxTextCtrl:new(Parent, ?SEARCH_ENTRY, [{style, ?wxTE_PROCESS_ENTER}]),
wxSizer:add(HSz, TC1, [{proportion,3}, {flag, ?wxEXPAND}]),
Nbtn = wxRadioButton:new(Parent, ?wxID_ANY, "Next"),
wxRadioButton:setValue(Nbtn, true),
wxSizer:add(HSz,Nbtn,[{flag,?wxALIGN_CENTER_VERTICAL}]),
Pbtn = wxRadioButton:new(Parent, ?wxID_ANY, "Previous"),
wxSizer:add(HSz,Pbtn,[{flag,?wxALIGN_CENTER_VERTICAL}]),
Cbtn = wxCheckBox:new(Parent, ?wxID_ANY, "Match Case"),
wxSizer:add(HSz,Cbtn,[{flag,?wxALIGN_CENTER_VERTICAL}]),
wxSizer:add(HSz, 15,15, [{proportion,1}, {flag, ?wxEXPAND}]),
wxSizer:add(HSz, wxStaticText:new(Parent, ?wxID_ANY, "Goto Entry:"),
[{flag,?wxALIGN_CENTER_VERTICAL}]),
TC2 = wxTextCtrl:new(Parent, ?GOTO_ENTRY, [{style, ?wxTE_PROCESS_ENTER}]),
wxSizer:add(HSz, TC2, [{proportion,0}, {flag, ?wxEXPAND}]),
wxTextCtrl:connect(TC1, command_text_updated),
wxTextCtrl:connect(TC1, command_text_enter),
wxTextCtrl:connect(TC1, kill_focus),
wxTextCtrl:connect(TC2, command_text_enter),
wxWindow:connect(Parent, command_button_clicked),
#search{name='Search Area', win=HSz,
search=TC1,goto=TC2,radio={Nbtn,Pbtn,Cbtn}}.
edit(Index, #state{pid=Pid, frame=Frame}) ->
Str = get_row(Pid, Index, all),
case observer_lib:user_term(Frame, "Edit object:", Str) of
cancel -> ok;
{ok, Term} -> Pid ! {edit, Index, Term};
Err = {error, _} -> self() ! Err
end.
handle_event(#wx{id=?ID_REFRESH},State = #state{pid=Pid}) ->
Pid ! refresh,
{noreply, State};
handle_event(#wx{event=#wxList{type=command_list_col_click, col=Col}},
State = #state{pid=Pid}) ->
Pid ! {sort, Col+1},
{noreply, State};
handle_event(#wx{event=#wxSize{size={W,_}}}, State=#state{grid=Grid}) ->
observer_lib:set_listctrl_col_size(Grid, W),
{noreply, State};
handle_event(#wx{event=#wxList{type=command_list_item_selected, itemIndex=Index}},
State = #state{pid=Pid, grid=Grid, status=StatusBar}) ->
N = wxListCtrl:getItemCount(Grid),
Str = get_row(Pid, Index, all),
wxStatusBar:setStatusText(StatusBar, io_lib:format("Objects: ~w: ~s",[N, Str])),
{noreply, State#state{selected=Index}};
handle_event(#wx{event=#wxList{type=command_list_item_activated, itemIndex=Index}},
State) ->
edit(Index, State),
{noreply, State};
handle_event(#wx{id=?ID_EDIT}, State = #state{selected=undefined}) ->
{noreply, State};
handle_event(#wx{id=?ID_EDIT}, State = #state{selected=Index}) ->
edit(Index, State),
{noreply, State};
handle_event(#wx{id=?ID_DELETE}, State = #state{selected=undefined}) ->
{noreply, State};
handle_event(#wx{id=?ID_DELETE},
State = #state{pid=Pid, status=StatusBar, selected=Index}) ->
Str = get_row(Pid, Index, all),
Pid ! {delete, Index},
wxStatusBar:setStatusText(StatusBar, io_lib:format("Deleted object: ~s",[Str])),
{noreply, State};
handle_event(#wx{id=?wxID_CLOSE}, State) ->
{stop, normal, State};
handle_event(Help = #wx{id=?wxID_HELP}, State = #state{parent=Parent}) ->
Parent ! Help,
{noreply, State};
handle_event(#wx{id=?GOTO_ENTRY, event=#wxCommand{cmdString=Str}},
State = #state{grid=Grid}) ->
try
Row0 = list_to_integer(Str),
Row1 = min(0, Row0),
Row = max(wxListCtrl:getItemCount(Grid)-1,Row1),
wxListCtrl:ensureVisible(Grid, Row),
ok
catch _:_ -> ok
end,
{noreply, State};
%% Search functionality
handle_event(#wx{id=?ID_SEARCH},
State = #state{sizer=Sz, search=Search}) ->
wxSizer:show(Sz, Search#search.win),
wxWindow:setFocus(Search#search.search),
wxSizer:layout(Sz),
{noreply, State};
handle_event(#wx{id=?SEARCH_ENTRY, event=#wxFocus{}},
State = #state{search=Search, pid=Pid}) ->
Pid ! {mark_search_hit, false},
{noreply, State#state{search=Search#search{find=undefined}}};
handle_event(#wx{id=?SEARCH_ENTRY, event=#wxCommand{cmdString=""}},
State = #state{search=Search, pid=Pid}) ->
Pid ! {mark_search_hit, false},
{noreply, State#state{search=Search#search{find=undefined}}};
handle_event(#wx{id=?SEARCH_ENTRY, event=#wxCommand{type=command_text_enter,cmdString=Str}},
State = #state{grid=Grid, pid=Pid, status=SB,
search=Search=#search{radio={Next0, _, Case0},
find=Find}})
when Find =/= undefined ->
Dir = wxRadioButton:getValue(Next0) xor wx_misc:getKeyState(?WXK_SHIFT),
Case = wxCheckBox:getValue(Case0),
Pos = if Find#find.found, Dir -> %% Forward Continuation
Find#find.start+1;
Find#find.found -> %% Backward Continuation
Find#find.start-1;
Dir -> %% Forward wrap
0;
true -> %% Backward wrap
wxListCtrl:getItemCount(Grid)-1
end,
Pid ! {mark_search_hit, false},
case search(Pid, Str, Pos, Dir, Case) of
false ->
wxStatusBar:setStatusText(SB, "Not found"),
Pid ! {mark_search_hit, Find#find.start},
wxListCtrl:refreshItem(Grid, Find#find.start),
{noreply, State#state{search=Search#search{find=#find{found=false}}}};
Row ->
wxListCtrl:ensureVisible(Grid, Row),
wxListCtrl:refreshItem(Grid, Row),
Status = "Found: (Hit Enter for next, Shift-Enter for previous)",
wxStatusBar:setStatusText(SB, Status),
{noreply, State#state{search=Search#search{find=#find{start=Row, found=true}}}}
end;
handle_event(#wx{id=?SEARCH_ENTRY, event=#wxCommand{cmdString=Str}},
State = #state{grid=Grid, pid=Pid, status=SB,
search=Search=#search{radio={Next0, _, Case0},
find=Find}}) ->
try
Dir = wxRadioButton:getValue(Next0),
Case = wxCheckBox:getValue(Case0),
Start = case Dir of
true -> 0;
false -> wxListCtrl:getItemCount(Grid)-1
end,
Cont = case Find of
undefined ->
#find{start=Start, strlen=length(Str)};
#find{strlen=Old} when Old < length(Str) ->
Find#find{start=Start, strlen=length(Str)};
_ ->
Find#find{strlen=length(Str)}
end,
Pid ! {mark_search_hit, false},
case search(Pid, Str, Cont#find.start, Dir, Case) of
false ->
wxStatusBar:setStatusText(SB, "Not found"),
{noreply, State};
Row ->
wxListCtrl:ensureVisible(Grid, Row),
wxListCtrl:refreshItem(Grid, Row),
Status = "Found: (Hit Enter for next, Shift-Enter for previous)",
wxStatusBar:setStatusText(SB, Status),
{noreply, State#state{search=Search#search{find=#find{start=Row, found=true}}}}
end
catch _:_ -> {noreply, State}
end;
handle_event(#wx{id=?ID_TABLE_INFO},
State = #state{frame=Frame, node=Node, source=Source, tab=Table}) ->
observer_tv_wx:display_table_info(Frame, Node, Source, Table),
{noreply, State};
handle_event(#wx{id=?ID_REFRESH_INTERVAL},
State = #state{grid=Grid, timer=Timer0}) ->
Timer = observer_lib:interval_dialog(Grid, Timer0, 10, 5*60),
{noreply, State#state{timer=Timer}};
handle_event(Event, State) ->
io:format("~p:~p, handle event ~p\n", [?MODULE, ?LINE, Event]),
{noreply, State}.
handle_sync_event(Event, _Obj, _State) ->
io:format("~p:~p, handle sync_event ~p\n", [?MODULE, ?LINE, Event]),
ok.
handle_call(Event, From, State) ->
io:format("~p:~p, handle call (~p) ~p\n", [?MODULE, ?LINE, From, Event]),
{noreply, State}.
handle_cast(Event, State) ->
io:format("~p:~p, handle cast ~p\n", [?MODULE, ?LINE, Event]),
{noreply, State}.
handle_info({no_rows, N}, State = #state{grid=Grid, status=StatusBar}) ->
wxListCtrl:setItemCount(Grid, N),
wxStatusBar:setStatusText(StatusBar, io_lib:format("Objects: ~w",[N])),
{noreply, State};
handle_info({new_cols, New}, State = #state{grid=Grid, columns=Cols0}) ->
Cols = add_columns(Grid, Cols0, New),
{noreply, State#state{columns=Cols}};
handle_info({refresh, Min, Max}, State = #state{grid=Grid}) ->
wxListCtrl:refreshItems(Grid, Min, Max),
{noreply, State};
handle_info({error, Error}, State = #state{frame=Frame}) ->
ErrorStr =
try io_lib:format("~ts", [Error]), Error
catch _:_ -> io_lib:format("~p", [Error])
end,
Dlg = wxMessageDialog:new(Frame, ErrorStr),
wxMessageDialog:showModal(Dlg),
wxMessageDialog:destroy(Dlg),
{noreply, State};
handle_info(_Event, State) ->
%% io:format("~p:~p, handle info ~p\n", [?MODULE, ?LINE, _Event]),
{noreply, State}.
terminate(_Event, #state{pid=Pid, attrs=Attrs}) ->
%% ListItemAttr are not auto deleted
#attrs{odd=Odd, deleted=D, changed=Ch, searched=S} = Attrs,
wxListItemAttr:destroy(Odd),
wxListItemAttr:destroy(D),
wxListItemAttr:destroy(Ch),
wxListItemAttr:destroy(S),
unlink(Pid),
exit(Pid, window_closed),
ok.
code_change(_, _, State) ->
State.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Table holder needs to be in a separate process otherwise
%% the callback get_row/3 may deadlock if the process do
%% wx calls when callback is invoked.
get_row(Table, Item, Column) ->
Ref = erlang:monitor(process, Table),
Table ! {get_row, self(), Item, Column},
receive
{'DOWN', Ref, _, _, _} -> "";
{Table, Res} ->
erlang:demonitor(Ref),
Res
end.
get_attr(Table, Item) ->
Ref = erlang:monitor(process, Table),
Table ! {get_attr, self(), Item},
receive
{'DOWN', Ref, _, _, _} -> "";
{Table, Res} ->
erlang:demonitor(Ref),
Res
end.
search(Table, Str, Row, Dir, Case) ->
Ref = erlang:monitor(process, Table),
Table ! {search, [Str, Row, Dir, Case]},
receive
{'DOWN', Ref, _, _, _} -> "";
{Table, Res} ->
erlang:demonitor(Ref),
Res
end.
-record(holder, {node, parent, pid,
table=[], n=0, columns,
temp=[],
search,
source, tabid,
sort,
key,
type,
attrs
}).
init_table_holder(Parent, Table, MnesiaOrEts, Cols, Node, Attrs) ->
TabId = case Table#tab.id of
ignore -> Table#tab.name;
Id -> Id
end,
self() ! refresh,
table_holder(#holder{node=Node, parent=Parent,
source=MnesiaOrEts, tabid=TabId, columns=Cols,
sort=#opt{sort_key=Table#tab.keypos, sort_incr=true},
type=Table#tab.type, key=Table#tab.keypos,
attrs=Attrs}).
table_holder(S0 = #holder{parent=Parent, pid=Pid, table=Table}) ->
receive
{get_attr, From, Row} ->
get_attr(From, Row, S0),
table_holder(S0);
{get_row, From, Row, Col} ->
get_row(From, Row, Col, Table),
table_holder(S0);
{Pid, Data} ->
S1 = handle_new_data_chunk(Data, S0),
table_holder(S1);
{sort, Col} ->
table_holder(sort(Col, S0));
{search, Data} ->
table_holder(search(Data, S0));
{mark_search_hit, Row} ->
Old = S0#holder.search,
is_integer(Old) andalso (Parent ! {refresh, Old, Old}),
table_holder(S0#holder{search=Row});
refresh when is_pid(Pid) ->
%% Already getting the table...
%% io:format("ignoring refresh", []),
table_holder(S0);
refresh ->
GetTab = rpc:call(S0#holder.node, observer_backend, get_table,
[self(), S0#holder.tabid, S0#holder.source]),
table_holder(S0#holder{pid=GetTab});
{delete, Row} ->
delete_row(Row, S0),
table_holder(S0);
{edit, Row, Term} ->
edit_row(Row, Term, S0),
table_holder(S0);
What ->
io:format("Table holder got ~p~n",[What]),
table_holder(S0)
end.
handle_new_data_chunk(Data, S0 = #holder{columns=Cols, parent=Parent}) ->
S1 = #holder{columns=NewCols} = handle_new_data_chunk2(Data, S0),
case NewCols =:= Cols of
true -> S1;
false ->
Parent ! {new_cols, lists:seq(Cols+1, NewCols)},
S1
end.
handle_new_data_chunk2('$end_of_table',
S0 = #holder{parent=Parent, sort=Opt,
key=Key,
table=Old, temp=New}) ->
Table = merge(Old, New, Key),
N = length(Table),
Parent ! {no_rows, N},
sort(Opt#opt.sort_key, S0#holder{n=N, pid=undefine,
sort=Opt#opt{sort_key = undefined},
table=Table, temp=[]});
handle_new_data_chunk2(Data, S0 = #holder{columns=Cols0, source=ets, temp=Tab0}) ->
{Tab, Cols} = parse_ets_data(Data, Cols0, Tab0),
S0#holder{columns=Cols, temp=Tab};
handle_new_data_chunk2(Data, S0 = #holder{source=mnesia, temp=Tab}) ->
S0#holder{temp=(Data ++ Tab)}.
parse_ets_data([[Rec]|Rs], C, Tab) ->
parse_ets_data(Rs, max(tuple_size(Rec), C), [Rec|Tab]);
parse_ets_data([Recs|Rs], C0, Tab0) ->
{Tab, Cols} = parse_ets_data(Recs, C0, Tab0),
parse_ets_data(Rs, Cols, Tab);
parse_ets_data([], Cols, Tab) ->
{Tab, Cols}.
sort(Col, S=#holder{n=N, parent=Parent, sort=Opt0, table=Table0}) ->
{Opt, Table} = sort(Col, Opt0, Table0),
Parent ! {refresh, 0, N-1},
S#holder{sort=Opt, table=Table}.
sort(Col, Opt = #opt{sort_key=Col, sort_incr=Bool}, Table) ->
{Opt#opt{sort_incr=not Bool}, lists:reverse(Table)};
sort(Col, S=#opt{sort_incr=true}, Table) ->
{S#opt{sort_key=Col}, keysort(Col, Table)};
sort(Col, S=#opt{sort_incr=false}, Table) ->
{S#opt{sort_key=Col}, lists:reverse(keysort(Col, Table))}.
keysort(Col, Table) ->
Sort = fun([A0|_], [B0|_]) ->
A = try element(Col, A0) catch _:_ -> [] end,
B = try element(Col, B0) catch _:_ -> [] end,
case A == B of
true -> A0 =< B0;
false -> A < B
end;
(A0, B0) when is_tuple(A0), is_tuple(B0) ->
A = try element(Col, A0) catch _:_ -> [] end,
B = try element(Col, B0) catch _:_ -> [] end,
case A == B of
true -> A0 =< B0;
false -> A < B
end
end,
lists:sort(Sort, Table).
search([Str, Row, Dir0, CaseSens],
S=#holder{parent=Parent, table=Table}) ->
Opt = case CaseSens of
true -> [];
false -> [caseless]
end,
Dir = case Dir0 of
true -> 1;
false -> -1
end,
Res = case re:compile(Str, Opt) of
{ok, Re} ->
search(Row, Dir, Re, Table);
{error, _} -> false
end,
Parent ! {self(), Res},
S#holder{search=Res}.
search(Row, Dir, Re, Table) ->
Res = try lists:nth(Row+1, Table) of
Term ->
Str = io_lib:format("~w", [Term]),
re:run(Str, Re)
catch _:_ -> no_more
end,
case Res of
nomatch -> search(Row+Dir, Dir, Re, Table);
no_more -> false;
{match,_} -> Row
end.
get_row(From, Row, Col, Table) ->
case lists:nth(Row+1, Table) of
[Object|_] when Col =:= all ->
From ! {self(), io_lib:format("~w", [Object])};
[Object|_] when tuple_size(Object) >= Col ->
From ! {self(), io_lib:format("~w", [element(Col, Object)])};
_ ->
From ! {self(), ""}
end.
get_attr(From, Row, #holder{attrs=Attrs, search=Row}) ->
What = Attrs#attrs.searched,
From ! {self(), What};
get_attr(From, Row, #holder{table=Table, attrs=Attrs}) ->
What = case lists:nth(Row+1, Table) of
[_|deleted] -> Attrs#attrs.deleted;
[_|changed] -> Attrs#attrs.changed;
[_|new] -> Attrs#attrs.changed;
_ when (Row rem 2) > 0 ->
Attrs#attrs.odd;
_ ->
Attrs#attrs.even
end,
From ! {self(), What}.
merge([], New, _Key) ->
[[N] || N <- New]; %% First time
merge(Old, New, Key) ->
merge2(keysort(Key, Old), keysort(Key, New), Key).
merge2([[Obj|_]|Old], [Obj|New], Key) ->
[[Obj]|merge2(Old, New, Key)];
merge2([[A|_]|Old], [B|New], Key)
when element(Key, A) == element(Key, B) ->
[[B|changed]|merge2(Old, New, Key)];
merge2([[A|_]|Old], New = [B|_], Key)
when element(Key, A) < element(Key, B) ->
[[A|deleted]|merge2(Old, New, Key)];
merge2(Old = [[A|_]|_], [B|New], Key)
when element(Key, A) > element(Key, B) ->
[[B|new]|merge2(Old, New, Key)];
merge2([], New, _Key) ->
[[N|new] || N <- New];
merge2(Old, [], _Key) ->
[[O|deleted] || [O|_] <- Old].
delete_row(Row, S0 = #holder{parent=Parent}) ->
case delete(Row, S0) of
ok ->
self() ! refresh;
{error, Err} ->
Parent ! {error, "Could not delete object: " ++ Err}
end.
delete(Row, #holder{tabid=Id, table=Table,
source=Source, node=Node}) ->
[Object|_] = lists:nth(Row+1, Table),
try
case Source of
ets ->
true = rpc:call(Node, ets, delete_object, [Id, Object]);
mnesia ->
ok = rpc:call(Node, mnesia, dirty_delete_object, [Id, Object])
end,
ok
catch _:_Error ->
{error, "node or table is not available"}
end.
edit_row(Row, Term, S0 = #holder{parent=Parent}) ->
case delete(Row, S0) of
ok ->
case insert(Term, S0) of
ok -> self() ! refresh;
Err -> Parent ! {error, Err}
end;
{error, Err} ->
Parent ! {error, "Could not edit object: " ++ Err}
end.
insert(Object, #holder{tabid=Id, source=Source, node=Node}) ->
try
case Source of
ets ->
true = rpc:call(Node, ets, insert, [Id, Object]);
mnesia ->
ok = rpc:call(Node, mnesia, dirty_write, [Id, Object])
end,
ok
catch _:_Error ->
{error, "node or table is not available"}
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
column_names(Node, Type, Table) ->
case Type of
ets -> [1, 2];
mnesia ->
Attrs = rpc:call(Node, mnesia, table_info, [Table, attributes]),
is_list(Attrs) orelse throw(node_or_table_down),
["Record Name"|Attrs]
end.
table_id(#tab{id=ignore, name=Name}) -> Name;
table_id(#tab{id=Id}) -> Id.
key_pos(_, mnesia, _) -> 2;
key_pos(Node, ets, TabId) ->
KeyPos = rpc:call(Node, ets, info, [TabId, keypos]),
is_integer(KeyPos) orelse throw(node_or_table_down),
KeyPos.
