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/*************************************************************************
*
* $RCSfile: accessibilityclient.cxx,v $
*
* $Revision: 1.2 $
*
* last change: $Author: hr $ $Date: 2007-06-27 15:16:02 $
*
* The Contents of this file are made available subject to the terms of
* either of the following licenses
*
* - GNU Lesser General Public License Version 2.1
* - Sun Industry Standards Source License Version 1.1
*
* Sun Microsystems Inc., October, 2000
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2000 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*
* Sun Industry Standards Source License Version 1.1
* =================================================
* The contents of this file are subject to the Sun Industry Standards
* Source License Version 1.1 (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.openoffice.org/license.html.
*
* Software provided under this License is provided on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
* WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
* MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
* See the License for the specific provisions governing your rights and
* obligations concerning the Software.
*
* The Initial Developer of the Original Code is: Sun Microsystems, Inc.
*
* Copyright: 2000 by Sun Microsystems, Inc.
*
* All Rights Reserved.
*
* Contributor(s): _______________________________________
*
*
************************************************************************/
// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_toolkit.hxx"
#ifndef TOOLKIT_HELPER_ACCESSIBILITY_CLIENT_HXX
#include <toolkit/helper/accessibilityclient.hxx>
#endif
#ifndef TOOLKIT_HELPER_ACCESSIBLE_FACTORY_HXX
#include <toolkit/helper/accessiblefactory.hxx>
#endif
#ifndef _OSL_MODULE_H_
#include <osl/module.h>
#endif
#ifndef _OSL_DIAGNOSE_H_
#include <osl/diagnose.h>
#endif
#ifndef _SOLAR_H
#include <tools/solar.h>
#endif
// #define UNLOAD_ON_LAST_CLIENT_DYING
// this is not recommended currently. If enabled, the implementation will log
// the number of active clients, and unload the acc library when the last client
// goes away.
// Sounds like a good idea, unfortunately, there's no guarantee that all objects
// implemented in this library are already dead.
// Iow, just because an object implementing an XAccessible (implemented in this lib
// here) died, it's not said that everybody released all references to the
// XAccessibleContext used by this component, and implemented in the acc lib.
// So we cannot really unload the lib.
//
// Alternatively, if the lib would us own "usage counting", i.e. every component
// implemented therein would affect a static ref count, the acc lib could care
// for unloading itself.
//........................................................................
namespace toolkit
{
//........................................................................
using namespace ::com::sun::star::uno;
using namespace ::com::sun::star::accessibility;
namespace
{
#ifdef UNLOAD_ON_LAST_CLIENT_DYING
static oslInterlockedCount s_nAccessibilityClients = 0;
#endif // UNLOAD_ON_LAST_CLIENT_DYING
static oslModule s_hAccessibleImplementationModule = NULL;
static GetStandardAccComponentFactory s_pAccessibleFactoryFunc = NULL;
static ::rtl::Reference< IAccessibleFactory > s_pFactory;
}
//====================================================================
//= AccessibleDummyFactory
//====================================================================
class AccessibleDummyFactory : public IAccessibleFactory
{
public:
AccessibleDummyFactory();
protected:
virtual ~AccessibleDummyFactory();
private:
AccessibleDummyFactory( const AccessibleDummyFactory& ); // never implemented
AccessibleDummyFactory& operator=( const AccessibleDummyFactory& ); // never implemented
oslInterlockedCount m_refCount;
public:
// IReference
virtual oslInterlockedCount SAL_CALL acquire();
virtual oslInterlockedCount SAL_CALL release();
// IAccessibleFactory
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXButton* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXCheckBox* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXRadioButton* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXListBox* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXFixedText* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXScrollBar* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXEdit* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXComboBox* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXToolBox* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessibleContext >
createAccessibleContext( VCLXWindow* /*_pXWindow*/ )
{
return NULL;
}
::com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessible >
createAccessible( Menu* /*_pMenu*/, sal_Bool /*_bIsMenuBar*/ )
{
return NULL;
}
};
//--------------------------------------------------------------------
AccessibleDummyFactory::AccessibleDummyFactory()
{
}
//--------------------------------------------------------------------
AccessibleDummyFactory::~AccessibleDummyFactory()
{
}
//--------------------------------------------------------------------
oslInterlockedCount SAL_CALL AccessibleDummyFactory::acquire()
{
return osl_incrementInterlockedCount( &m_refCount );
}
//--------------------------------------------------------------------
oslInterlockedCount SAL_CALL AccessibleDummyFactory::release()
{
if ( 0 == osl_decrementInterlockedCount( &m_refCount ) )
{
delete this;
return 0;
}
return m_refCount;
}
//====================================================================
//= AccessibilityClient
//====================================================================
//--------------------------------------------------------------------
AccessibilityClient::AccessibilityClient()
:m_bInitialized( false )
{
}
//--------------------------------------------------------------------
void AccessibilityClient::ensureInitialized()
{
if ( m_bInitialized )
return;
::osl::MutexGuard aGuard( ::osl::Mutex::getGlobalMutex() );
#ifdef UNLOAD_ON_LAST_CLIENT_DYING
if ( 1 == osl_incrementInterlockedCount( &s_nAccessibilityClients ) )
{ // the first client
#endif // UNLOAD_ON_LAST_CLIENT_DYING
// load the library implementing the factory
if ( !s_pFactory.get() )
{
const ::rtl::OUString sModuleName = ::rtl::OUString::createFromAscii(
SVLIBRARY( "acc" )
);
s_hAccessibleImplementationModule = osl_loadModule( sModuleName.pData, 0 );
if ( s_hAccessibleImplementationModule != NULL )
{
const ::rtl::OUString sFactoryCreationFunc =
::rtl::OUString::createFromAscii( "getStandardAccessibleFactory" );
s_pAccessibleFactoryFunc = (GetStandardAccComponentFactory)
osl_getFunctionSymbol( s_hAccessibleImplementationModule, sFactoryCreationFunc.pData );
}
OSL_ENSURE( s_pAccessibleFactoryFunc, "AccessibilityClient::ensureInitialized: could not load the library, or not retrieve the needed symbol!" );
// get a factory instance
if ( s_pAccessibleFactoryFunc )
{
IAccessibleFactory* pFactory = static_cast< IAccessibleFactory* >( (*s_pAccessibleFactoryFunc)() );
OSL_ENSURE( pFactory, "AccessibilityClient::ensureInitialized: no factory provided by the A11Y lib!" );
if ( pFactory )
{
s_pFactory = pFactory;
pFactory->release();
}
}
}
if ( !s_pFactory.get() )
// the attempt to load the lib, or to create the factory, failed
// -> fall back to a dummy factory
s_pFactory = new AccessibleDummyFactory;
#ifdef UNLOAD_ON_LAST_CLIENT_DYING
}
#endif
m_bInitialized = true;
}
//--------------------------------------------------------------------
AccessibilityClient::~AccessibilityClient()
{
if ( m_bInitialized )
{
::osl::MutexGuard aGuard( ::osl::Mutex::getGlobalMutex() );
#ifdef UNLOAD_ON_LAST_CLIENT_DYING
if( 0 == osl_decrementInterlockedCount( &s_nAccessibilityClients ) )
{
s_pFactory = NULL;
s_pAccessibleFactoryFunc = NULL;
if ( s_hAccessibleImplementationModule )
{
osl_unloadModule( s_hAccessibleImplementationModule );
s_hAccessibleImplementationModule = NULL;
}
}
#endif // UNLOAD_ON_LAST_CLIENT_DYING
}
}
//--------------------------------------------------------------------
IAccessibleFactory& AccessibilityClient::getFactory()
{
ensureInitialized();
OSL_ENSURE( s_pFactory.is(), "AccessibilityClient::getFactory: at least a dummy factory should have been created!" );
return *s_pFactory;
}
//........................................................................
} // namespace toolkit
//........................................................................
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