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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;
+
+ static const char ACTIVE_CONNECTION_PROPERTY_NAME[] = "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, makeAny( _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: */