1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 21 22 23 24 // MARKER(update_precomp.py): autogen include statement, do not remove 25 #include "precompiled_connectivity.hxx" 26 #include <connectivity/conncleanup.hxx> 27 #include <com/sun/star/beans/XPropertySet.hpp> 28 #include <com/sun/star/lang/XComponent.hpp> 29 #include <osl/diagnose.h> 30 31 //......................................................................... 32 namespace dbtools 33 { 34 //......................................................................... 35 36 using namespace ::com::sun::star::uno; 37 using namespace ::com::sun::star::beans; 38 using namespace ::com::sun::star::sdbc; 39 using namespace ::com::sun::star::lang; 40 41 //===================================================================== 42 static const ::rtl::OUString& getActiveConnectionPropertyName() 43 { 44 static const ::rtl::OUString s_sActiveConnectionPropertyName = ::rtl::OUString::createFromAscii("ActiveConnection"); 45 return s_sActiveConnectionPropertyName; 46 } 47 48 //===================================================================== 49 //= OAutoConnectionDisposer 50 //===================================================================== 51 //--------------------------------------------------------------------- 52 OAutoConnectionDisposer::OAutoConnectionDisposer(const Reference< XRowSet >& _rxRowSet, const Reference< XConnection >& _rxConnection) 53 :m_xRowSet( _rxRowSet ) 54 ,m_bRSListening( sal_False ) 55 ,m_bPropertyListening( sal_False ) 56 { 57 Reference< XPropertySet > xProps(_rxRowSet, UNO_QUERY); 58 OSL_ENSURE(xProps.is(), "OAutoConnectionDisposer::OAutoConnectionDisposer: invalid rowset (no XPropertySet)!"); 59 60 if (!xProps.is()) 61 return; 62 63 try 64 { 65 xProps->setPropertyValue( getActiveConnectionPropertyName(), makeAny( _rxConnection ) ); 66 m_xOriginalConnection = _rxConnection; 67 startPropertyListening( xProps ); 68 } 69 catch( const Exception& ) 70 { 71 OSL_ENSURE( sal_False, "OAutoConnectionDisposer::OAutoConnectionDisposer: caught an exception!" ); 72 } 73 } 74 75 //--------------------------------------------------------------------- 76 void OAutoConnectionDisposer::startPropertyListening( const Reference< XPropertySet >& _rxRowSet ) 77 { 78 try 79 { 80 _rxRowSet->addPropertyChangeListener( getActiveConnectionPropertyName(), this ); 81 m_bPropertyListening = sal_True; 82 } 83 catch( const Exception& ) 84 { 85 OSL_ENSURE( sal_False, "OAutoConnectionDisposer::startPropertyListening: caught an exception!" ); 86 } 87 } 88 89 //--------------------------------------------------------------------- 90 void OAutoConnectionDisposer::stopPropertyListening( const Reference< XPropertySet >& _rxEventSource ) 91 { 92 // prevent deletion of ourself while we're herein 93 Reference< XInterface > xKeepAlive(static_cast< XWeak* >(this)); 94 95 try 96 { // remove ourself as property change listener 97 OSL_ENSURE( _rxEventSource.is(), "OAutoConnectionDisposer::stopPropertyListening: invalid event source (no XPropertySet)!" ); 98 if ( _rxEventSource.is() ) 99 { 100 _rxEventSource->removePropertyChangeListener( getActiveConnectionPropertyName(), this ); 101 m_bPropertyListening = sal_False; 102 } 103 } 104 catch( const Exception& ) 105 { 106 OSL_ENSURE( sal_False, "OAutoConnectionDisposer::stopPropertyListening: caught an exception!" ); 107 } 108 } 109 110 //--------------------------------------------------------------------- 111 void OAutoConnectionDisposer::startRowSetListening() 112 { 113 OSL_ENSURE( !m_bRSListening, "OAutoConnectionDisposer::startRowSetListening: already listening!" ); 114 try 115 { 116 if ( !m_bRSListening ) 117 m_xRowSet->addRowSetListener( this ); 118 } 119 catch( const Exception& ) 120 { 121 OSL_ENSURE( sal_False, "OAutoConnectionDisposer::startRowSetListening: caught an exception!" ); 122 } 123 m_bRSListening = sal_True; 124 } 125 126 //--------------------------------------------------------------------- 127 void OAutoConnectionDisposer::stopRowSetListening() 128 { 129 OSL_ENSURE( m_bRSListening, "OAutoConnectionDisposer::stopRowSetListening: not listening!" ); 130 try 131 { 132 m_xRowSet->removeRowSetListener( this ); 133 } 134 catch( const Exception& ) 135 { 136 OSL_ENSURE( sal_False, "OAutoConnectionDisposer::stopRowSetListening: caught an exception!" ); 137 } 138 m_bRSListening = sal_False; 139 } 140 141 //--------------------------------------------------------------------- 142 void SAL_CALL OAutoConnectionDisposer::propertyChange( const PropertyChangeEvent& _rEvent ) throw (RuntimeException) 143 { 144 if ( _rEvent.PropertyName.equals( getActiveConnectionPropertyName() ) ) 145 { // somebody set a new ActiveConnection 146 147 Reference< XConnection > xNewConnection; 148 _rEvent.NewValue >>= xNewConnection; 149 150 if ( isRowSetListening() ) 151 { 152 // we're listening at the row set, this means that the row set does not have our 153 // m_xOriginalConnection as active connection anymore 154 // So there are two possibilities 155 // a. somebody sets a new connection which is not our original one 156 // b. somebody sets a new connection, which is exactly the original one 157 // a. we're not interested in a, but in b: In this case, we simply need to move to the state 158 // we had originally: listen for property changes, do not listen for row set changes, and 159 // do not dispose the connection until the row set does not need it anymore 160 if ( xNewConnection.get() == m_xOriginalConnection.get() ) 161 { 162 stopRowSetListening(); 163 } 164 } 165 else 166 { 167 // start listening at the row set. We're allowed to dispose the old connection as soon 168 // as the RowSet changed 169 170 // Unfortunately, the our database form implementations sometimes fire the change of their 171 // ActiveConnection twice. This is a error in forms/source/component/DatabaseForm.cxx, but 172 // changing this would require incompatible changes we can't do for a while. 173 // So for the moment, we have to live with it here. 174 // 175 // The only scenario where this doubled notification causes problems is when the connection 176 // of the form is reset to the one we're responsible for (m_xOriginalConnection), so we 177 // check this here. 178 // 179 // Yes, this is a HACK :( 180 // 181 // 94407 - 08.11.2001 - fs@openoffice.org 182 if ( xNewConnection.get() != m_xOriginalConnection.get() ) 183 { 184 #if OSL_DEBUG_LEVEL > 0 185 Reference< XConnection > xOldConnection; 186 _rEvent.OldValue >>= xOldConnection; 187 OSL_ENSURE( xOldConnection.get() == m_xOriginalConnection.get(), "OAutoConnectionDisposer::propertyChange: unexpected (original) property value!" ); 188 #endif 189 startRowSetListening(); 190 } 191 } 192 } 193 } 194 195 //--------------------------------------------------------------------- 196 void SAL_CALL OAutoConnectionDisposer::disposing( const EventObject& _rSource ) throw (RuntimeException) 197 { 198 // the rowset is beeing disposed, and nobody has set a new ActiveConnection in the meantime 199 if ( isRowSetListening() ) 200 stopRowSetListening(); 201 202 clearConnection(); 203 204 if ( isPropertyListening() ) 205 stopPropertyListening( Reference< XPropertySet >( _rSource.Source, UNO_QUERY ) ); 206 } 207 //--------------------------------------------------------------------- 208 void OAutoConnectionDisposer::clearConnection() 209 { 210 try 211 { 212 // dispose the old connection 213 Reference< XComponent > xComp(m_xOriginalConnection, UNO_QUERY); 214 if (xComp.is()) 215 xComp->dispose(); 216 m_xOriginalConnection.clear(); 217 } 218 catch(Exception&) 219 { 220 OSL_ENSURE(sal_False, "OAutoConnectionDisposer::clearConnection: caught an exception!"); 221 } 222 } 223 //--------------------------------------------------------------------- 224 void SAL_CALL OAutoConnectionDisposer::cursorMoved( const ::com::sun::star::lang::EventObject& /*event*/ ) throw (::com::sun::star::uno::RuntimeException) 225 { 226 } 227 //--------------------------------------------------------------------- 228 void SAL_CALL OAutoConnectionDisposer::rowChanged( const ::com::sun::star::lang::EventObject& /*event*/ ) throw (::com::sun::star::uno::RuntimeException) 229 { 230 } 231 //--------------------------------------------------------------------- 232 void SAL_CALL OAutoConnectionDisposer::rowSetChanged( const ::com::sun::star::lang::EventObject& /*event*/ ) throw (::com::sun::star::uno::RuntimeException) 233 { 234 stopRowSetListening(); 235 clearConnection(); 236 237 } 238 //--------------------------------------------------------------------- 239 240 //......................................................................... 241 } // namespace dbtools 242 //......................................................................... 243 244