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App.cpp
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208 lines (167 loc) · 5.18 KB
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/*
Copyright (C) 1998-2007 Emil Maskovsky
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.
*/
/**
@file
Application base classes (implementation).
@author Emil Maskovsky
*/
/* System libraries. */
/* Framework libraries. */
/* Application specific. */
#include "mx/App/App.hpp"
// Start the exception implementation.
MX_IMPLEMENT_EXCEPTION_CLASS(mx::ApplicationException);
/// The application instance.
mx::Application * mx::Application::pApplicationInstance = NULL;
/**
Default constructor.
*/
mx::Application::Application()
{
// Can create only one application instance.
if (pApplicationInstance)
{
mxLogWarning(
_("The application instance already created using [%s]!"),
pApplicationInstance->getName());
}
pApplicationInstance = this;
}
/**
Destructor.
*/
/* virtual */ mx::Application::~Application()
{}
/**
Runs the application main loop.
@return
Application return code (to be passed to system).
*/
int mx::Application::Run(void)
{
int iReturnCode = 0;
try
{
if (!Initialize())
{
// Initialication might throw exception, of course.
mxLogError(_("Application initialization failed."));
return RC_INTERNAL_ERROR;
}
iReturnCode = OnRun();
}
// Catch all framework - based exceptions thrown by reference.
catch (const Exception & e)
{
Exception::HandleFailure(&e);
}
// Catch all framework - based exceptions thrown by pointer.
catch (const Exception * e)
{
// The pointer is not '* const', because under some compilers this
// causes loss of original exception type (see
// 'examples/ExceptionPointerOrReference.cpp' for details).
Exception::FailAndDestroy(e);
}
// Catch all std::exception based exceptions thrown by reference.
catch (const std::exception & e)
{
Exception::HandleFailure(&e);
}
// Catch all std::exception based exceptions thrown by pointer.
catch (const std::exception * e)
{
// The pointer is not '* const', because under some compilers this
// causes loss of original exception type (see
// 'examples/ExceptionPointerOrReference.cpp' for details).
Exception::FailAndDestroy(e);
}
// Catch all other exceptions.
catch (...)
{
Exception::HandleUncaughtException();
}
return iReturnCode;
}
/**
Initialize the application main loop.
@return
The initialization status - @c true on success, @c false in case of an
initialization error (e.g. fail in the OnInit() handler).
@warning
You should not override this function. You probably will override
the OnInit() handler instead.
@see OnInit().
*/
bool mx::Application::Initialize(void)
{
// Run OnInit handler.
return OnInit();
}
/**
OnInit event handler.
You should override this function to provide custom application
initialization.
@warning
If you want to process default initialization (e.g. parsing command line),
you must call OnInit() handler of your base class (and you @b should return
@c false in case the initialization fails) - you probably want to use
following code in your handler:
@code
bool MyApp::OnInit(void)
{
if (!SuperClass::OnInit()) {
return false;
}
...
if (something_failed) {
return false;
}
...
return true;
}
@endcode
@return
Should return initialization status - @c true on success, @c false in case
of an initialization error. If returns @c true, the application will continue
running the main loop; otherwise, the application will fail with an error
message.
@note
You can, of course, use exceptions (derived from cxException) inside the
handler to signalize error (and exception usage will be better in most
cases than signalizing error through return value).
*/
/* virtual */ bool mx::Application::OnInit()
{
return true;
}
/**
OnRun event handler.
You should override this function to provide custom run functionality.
@return
Should return the application return code (to be passed to system).
On successfull application run, it should return #RC_SUCCESS (or @c 0, which
is equivalent of that constant), on failure it should return any other
non-zero value (e.g. #RC_FAILURE, or some application-defined error code
etc.).
*/
/* virtual */ mx::Application::ReturnCode mx::Application::OnRun()
{
return RC_SUCCESS;
}
// Implement inline methods here if inlining is disabled.
#ifndef MX_INLINE_ENABLED
#include "mx/App/App.inl"
#endif
/* EOF */