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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you 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 .
*/
#include <connectivity/conncleanup.hxx>
#include <com/sun/star/beans/XPropertySet.hpp>
#include <com/sun/star/lang/XComponent.hpp>
#include <com/sun/star/sdbc/XRowSet.hpp>
#include <com/sun/star/sdbc/XConnection.hpp>
#include <osl/diagnose.h>
#include <tools/diagnose_ex.h>
namespace dbtools
{
using namespace css::uno;
using namespace css::beans;
using namespace css::sdbc;
using namespace css::lang;
constexpr OUStringLiteral ACTIVE_CONNECTION_PROPERTY_NAME = u"ActiveConnection";
OAutoConnectionDisposer::OAutoConnectionDisposer(const Reference< XRowSet >& _rxRowSet, const Reference< XConnection >& _rxConnection)
:m_xRowSet( _rxRowSet )
,m_bRSListening( false )
,m_bPropertyListening( false )
{
Reference< XPropertySet > xProps(_rxRowSet, UNO_QUERY);
OSL_ENSURE(xProps.is(), "OAutoConnectionDisposer::OAutoConnectionDisposer: invalid rowset (no XPropertySet)!");
if (!xProps.is())
return;
try
{
xProps->setPropertyValue( ACTIVE_CONNECTION_PROPERTY_NAME, Any( _rxConnection ) );
m_xOriginalConnection = _rxConnection;
startPropertyListening( xProps );
}
catch( const Exception& )
{
TOOLS_WARN_EXCEPTION( "connectivity.commontools", "OAutoConnectionDisposer::OAutoConnectionDisposer" );
}
}
void OAutoConnectionDisposer::startPropertyListening( const Reference< XPropertySet >& _rxRowSet )
{
try
{
_rxRowSet->addPropertyChangeListener( ACTIVE_CONNECTION_PROPERTY_NAME, this );
m_bPropertyListening = true;
}
catch( const Exception& )
{
TOOLS_WARN_EXCEPTION( "connectivity.commontools", "OAutoConnectionDisposer::startPropertyListening" );
}
}
void OAutoConnectionDisposer::stopPropertyListening( const Reference< XPropertySet >& _rxEventSource )
{
// prevent deletion of ourself while we're herein
Reference< XInterface > xKeepAlive(static_cast< XWeak* >(this));
try
{ // remove ourself as property change listener
OSL_ENSURE( _rxEventSource.is(), "OAutoConnectionDisposer::stopPropertyListening: invalid event source (no XPropertySet)!" );
if ( _rxEventSource.is() )
{
_rxEventSource->removePropertyChangeListener( ACTIVE_CONNECTION_PROPERTY_NAME, this );
m_bPropertyListening = false;
}
}
catch( const Exception& )
{
TOOLS_WARN_EXCEPTION( "connectivity.commontools", "OAutoConnectionDisposer::stopPropertyListening" );
}
}
void OAutoConnectionDisposer::startRowSetListening()
{
OSL_ENSURE( !m_bRSListening, "OAutoConnectionDisposer::startRowSetListening: already listening!" );
try
{
if ( !m_bRSListening )
m_xRowSet->addRowSetListener( this );
}
catch( const Exception& )
{
TOOLS_WARN_EXCEPTION( "connectivity.commontools", "OAutoConnectionDisposer::startRowSetListening" );
}
m_bRSListening = true;
}
void OAutoConnectionDisposer::stopRowSetListening()
{
OSL_ENSURE( m_bRSListening, "OAutoConnectionDisposer::stopRowSetListening: not listening!" );
try
{
m_xRowSet->removeRowSetListener( this );
}
catch( const Exception& )
{
TOOLS_WARN_EXCEPTION( "connectivity.commontools", "OAutoConnectionDisposer::stopRowSetListening" );
}
m_bRSListening = false;
}
void SAL_CALL OAutoConnectionDisposer::propertyChange( const PropertyChangeEvent& _rEvent )
{
if ( _rEvent.PropertyName != ACTIVE_CONNECTION_PROPERTY_NAME )
return;
// somebody set a new ActiveConnection
Reference< XConnection > xNewConnection;
_rEvent.NewValue >>= xNewConnection;
if ( isRowSetListening() )
{
// we're listening at the row set, this means that the row set does not have our
// m_xOriginalConnection as active connection anymore
// So there are two possibilities
// a. somebody sets a new connection which is not our original one
// b. somebody sets a new connection, which is exactly the original one
// a. we're not interested in a, but in b: In this case, we simply need to move to the state
// we had originally: listen for property changes, do not listen for row set changes, and
// do not dispose the connection until the row set does not need it anymore
if ( xNewConnection.get() == m_xOriginalConnection.get() )
{
stopRowSetListening();
}
}
else
{
// start listening at the row set. We're allowed to dispose the old connection as soon
// as the RowSet changed
// Unfortunately, the our database form implementations sometimes fire the change of their
// ActiveConnection twice. This is an error in forms/source/component/DatabaseForm.cxx, but
// changing this would require incompatible changes we can't do for a while.
// So for the moment, we have to live with it here.
//
// The only scenario where this doubled notification causes problems is when the connection
// of the form is reset to the one we're responsible for (m_xOriginalConnection), so we
// check this here.
//
// Yes, this is a HACK :(
if ( xNewConnection.get() != m_xOriginalConnection.get() )
{
#if OSL_DEBUG_LEVEL > 0
Reference< XConnection > xOldConnection;
_rEvent.OldValue >>= xOldConnection;
OSL_ENSURE( xOldConnection.get() == m_xOriginalConnection.get(), "OAutoConnectionDisposer::propertyChange: unexpected (original) property value!" );
#endif
startRowSetListening();
}
}
}
void SAL_CALL OAutoConnectionDisposer::disposing( const EventObject& _rSource )
{
// the rowset is being disposed, and nobody has set a new ActiveConnection in the meantime
if ( isRowSetListening() )
stopRowSetListening();
clearConnection();
if ( m_bPropertyListening )
stopPropertyListening( Reference< XPropertySet >( _rSource.Source, UNO_QUERY ) );
}
void OAutoConnectionDisposer::clearConnection()
{
try
{
// dispose the old connection
Reference< XComponent > xComp(m_xOriginalConnection, UNO_QUERY);
if (xComp.is())
xComp->dispose();
m_xOriginalConnection.clear();
}
catch(Exception&)
{
TOOLS_WARN_EXCEPTION("connectivity.commontools", "OAutoConnectionDisposer::clearConnection");
}
}
void SAL_CALL OAutoConnectionDisposer::cursorMoved( const css::lang::EventObject& /*event*/ )
{
}
void SAL_CALL OAutoConnectionDisposer::rowChanged( const css::lang::EventObject& /*event*/ )
{
}
void SAL_CALL OAutoConnectionDisposer::rowSetChanged( const css::lang::EventObject& /*event*/ )
{
stopRowSetListening();
clearConnection();
}
} // namespace dbtools
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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