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unit MyxError;
// Copyright (C) 2003, 2004 MySQL AB
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
interface
uses
gnugettext, Classes, SysUtils, Forms, AuxFuncs, myx_public_interface;
type
// Common base class for all MySQL exceptions.
EMyxError = class(Exception)
private
FDescription: WideString;
protected
function GetFormattedMessage: WideString; virtual;
public
constructor Create(ADescription: WideString); virtual;
property Description: WideString read FDescription;
property FormattedMessage: WideString read GetFormattedMessage;
end;
EMyxEnhancedError = class(EMyxError)
private
FErrorNr: Integer;
FErrorText: WideString;
protected
function GetFormattedMessage: WideString; override;
public
constructor Create(ADescription: WideString; AErrorNr: Integer; AErrorText: WideString); reintroduce; virtual;
property ErrorNr: Integer read FErrorNr;
property ErrorText: WideString read FErrorText;
end;
EMyxCriticalError = class(EMyxEnhancedError)
public
constructor Create(ADescription: WideString; ErrorNr: Integer); reintroduce; virtual;
end;
EMyxSystemError = class(EMyxEnhancedError)
protected
function GetFormattedMessage: WideString; override;
public
constructor Create(ADescription: WideString; ErrorNr: Integer); reintroduce; virtual;
end;
EMyxSQLError = class(EMyxEnhancedError)
protected
function GetFormattedMessage: WideString; override;
end;
EMyxLibraryError = class(EMyxEnhancedError)
private
FErrorNrParam: WideString;
protected
function GetFormattedMessage: WideString; override;
public
constructor Create(ADescription: WideString; AErrorNr: Integer; AErrorNrParam: WideString); reintroduce; virtual;
property ErrorNrParam: WideString read FErrorNrParam;
end;
EMyxCommonLibraryError = class(EMyxLibraryError)
public
constructor Create(ADescription: WideString; AErrorNr: Integer; AErrorNrParam: WideString); override;
end;
procedure ShowError(E: Exception);
//----------------------------------------------------------------------------------------------------------------------
implementation
//----------------- EMyxError- -----------------------------------------------------------------------------------------
constructor EMyxError.Create(ADescription: WideString);
begin
FDescription := ADescription;
// Set the base exception description as well, although due to the ANSI conversion some info might be lost.
Message := ADescription;
end;
//----------------------------------------------------------------------------------------------------------------------
function EMyxError.GetFormattedMessage: WideString;
// Returns a composed message about the exception. Descendants should override for more meaningfull output.
begin
Result := FDescription;
end;
//----------------- EMyxEnhancedError ----------------------------------------------------------------------------------
constructor EMyxEnhancedError.Create(ADescription: WideString; AErrorNr: Integer; AErrorText: WideString);
begin
inherited Create(ADescription);
FErrorNr := AErrorNr;
FErrorText := AErrorText;
end;
//----------------------------------------------------------------------------------------------------------------------
function EMyxEnhancedError.GetFormattedMessage: WideString;
begin
Result := WideFormat(_('%s'#10' The following error occured: %s (%d)'), [inherited GetFormattedMessage, FErrorText, FErrorNr]);
end;
//----------------- EMyxCriticalError ----------------------------------------------------------------------------------
constructor EMyxCriticalError.Create(ADescription: WideString; ErrorNr: Integer);
begin
inherited Create(ADescription, ErrorNr, '');
end;
//----------------- EMyxSystemError ------------------------------------------------------------------------------------
constructor EMyxSystemError.Create(ADescription: WideString; ErrorNr: Integer);
begin
inherited Create(ADescription, ErrorNr, SysErrorMessage(ErrorNr));
end;
//----------------------------------------------------------------------------------------------------------------------
function EMyxSystemError.GetFormattedMessage: WideString;
begin
Result := WideFormat(_('System Error Number %d'#10'%s'), [ErrorNr, ErrorText]);
end;
//----------------- EMyxSQLError ---------------------------------------------------------------------------------------
function EMyxSQLError.GetFormattedMessage: WideString;
begin
Result := WideFormat(_('A MySQL error was encountered. The message is:' + #10#10 + '%s'), [inherited GetFormattedMessage]);
end;
//----------------- EMyxLibraryError -----------------------------------------------------------------------------------
constructor EMyxLibraryError.Create(ADescription: WideString; AErrorNr: Integer; AErrorNrParam: WideString);
begin
inherited Create(ADescription, AErrorNr, AErrorNrParam);
end;
//----------------------------------------------------------------------------------------------------------------------
function EMyxLibraryError.GetFormattedMessage: WideString;
begin
Result := WideFormat(_('Library Error Number %d' + #13#10 + '%s'), [ErrorNr, ErrorNrParam]);
end;
//----------------- EMyxCommonLibraryError -----------------------------------------------------------------------------
constructor EMyxCommonLibraryError.Create(ADescription: WideString; AErrorNr: Integer; AErrorNrParam: WideString);
begin
case MYX_LIB_ERROR(FErrorNr) of
MYX_ERROR_CANT_OPEN_FILE:
ADescription := WideFormat(_('The File %s cannot be opened.'), [ErrorNrParam]);
MYX_ERROR_CANT_CONNECT_TO_INSTANCE:
ADescription := _('A connection to the server cannot be established.');
MYX_XML_PARSE_ERROR:
ADescription := WideFormat(_('An error occured while parsing the XML file %s.'), [ErrorNrParam]);
MYX_XML_NO_VALID_DOCUMENT:
ADescription := WideFormat(_('An error occured while validating the XML file %s.'), [ErrorNrParam]);
MYX_XML_EMPTY_DOCUMENT:
ADescription := WideFormat(_('The XML file %s is empty.'), [ErrorNrParam]);
MYX_SQL_ERROR:
ADescription := _('An SQL error occured.');
MYX_STOP_EXECUTION:
ADescription := _('The execution was stopped.');
end;
inherited;
end;
//----------------------------------------------------------------------------------------------------------------------
procedure ShowError(E: Exception);
var
res: Integer;
MyxError: EMyxError;
Message: WideString;
begin
if not (Application.Terminated) then
begin
if E is EMyxError then
begin
MyxError := E as EmyxError;
Message := MyxError.FormattedMessage;
if (E is EMyxCriticalError) then
begin
res := ShowModalDialog(Application.Title + ' ' + _('Critical Error'),
Format(_('The following Exception occurred:' + #13#10 + '%s' + #13#10#13#10 +
'Please choose whether to continue %s, terminate the application ' +
'or restart the program.'), [Message, Application.Title]),
myx_mtError, _('Continue') + #13#10 + _('Terminate') + #13#10 + _('Restart'));
if (res = 2) then
Application.Terminate
else
if (res = 3) then
begin
CreateSubProcess(Application.ExeName);
Application.Terminate;
end;
end
else
if (E is EMyxSQLError) then
begin
ShowModalDialog(Application.Title + ' ' + _('SQL Error'), Message + #13#10#13#10 +
MyxError.FormattedMessage, myx_mtError, _('OK'));
end
else
if (E is EMyxSystemError) then
begin
ShowModalDialog(Application.Title + ' ' + _('System Error'), Message + #13#10#13#10 +
MyxError.FormattedMessage, myx_mtError, _('OK'));
end
else
if (E is EMyxLibraryError) then
begin
ShowModalDialog(Application.Title + ' ' + _('Library Error'), Message + #13#10#13#10 + MyxError.FormattedMessage,
myx_mtError, _('OK'));
end
else
begin
ShowModalDialog(Application.Title + ' Error', 'The following exception occurred:' + #13#10#13#10 +
Message, myx_mtError, 'OK');
end
end;
end
else
begin
ShowModalDialog(Application.Title + ' Error', 'The following Exception occurred:' + #13#10#13#10 + E.Message,
myx_mtError, 'OK');
end;
end;
//----------------------------------------------------------------------------------------------------------------------
end.
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