extensions/source/propctrlr/formlinkdialog.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20
  21 #include "formlinkdialog.hxx"
  22
  23 #include "modulepcr.hxx"
  24 #include <strings.hrc>
  25 #include "formstrings.hxx"
  26 #include <sal/log.hxx>
  27 #include <comphelper/diagnose_ex.hxx>
  28 #include <utility>
  29 #include <vcl/svapp.hxx>
  30 #include <connectivity/dbtools.hxx>
  31 #include <connectivity/dbexception.hxx>
  32 #include <comphelper/sequence.hxx>
  33
  34 #include <com/sun/star/sdbcx/XColumnsSupplier.hpp>
  35 #include <com/sun/star/sdbcx/XKeysSupplier.hpp>
  36 #include <com/sun/star/sdbcx/KeyType.hpp>
  37 #include <com/sun/star/container/XNameAccess.hpp>
  38 #include <com/sun/star/sdbcx/XTablesSupplier.hpp>
  39 #include <com/sun/star/sdbc/XRowSet.hpp>
  40 #include <com/sun/star/sdb/CommandType.hpp>
  41 #include <com/sun/star/sdb/SQLContext.hpp>
  42 #include <com/sun/star/sdb/XSingleSelectQueryComposer.hpp>
  43
  44 namespace pcr
  45 {
  46
  47
  48     using namespace ::com::sun::star::uno;
  49     using namespace ::com::sun::star::sdb;
  50     using namespace ::com::sun::star::sdbc;
  51     using namespace ::com::sun::star::sdbcx;
  52     using namespace ::com::sun::star::beans;
  53     using namespace ::com::sun::star::container;
  54
  55
  56     //= FieldLinkRow
  57
  58     class FieldLinkRow
  59     {
  60     private:
  61         std::unique_ptr<weld::ComboBox> m_xDetailColumn;
  62         std::unique_ptr<weld::ComboBox> m_xMasterColumn;
  63
  64         Link<FieldLinkRow&,void> m_aLinkChangeHandler;
  65
  66     public:
  67         FieldLinkRow(std::unique_ptr<weld::ComboBox> xDetailColumn,
  68                      std::unique_ptr<weld::ComboBox> xMasterColumn);
  69
  70
  71         void         SetLinkChangeHandler( const Link<FieldLinkRow&,void>& _rHdl ) { m_aLinkChangeHandler = _rHdl; }
  72
  73         enum LinkParticipant
  74         {
  75             eDetailField,
  76             eMasterField
  77         };
  78         /** retrieves the selected field name for either the master or the detail field
  79             @return <TRUE/> if and only a valid field is selected
  80         */
  81         bool    GetFieldName( LinkParticipant _eWhich, OUString& /* [out] */ _rName ) const;
  82         void    SetFieldName( LinkParticipant _eWhich, const OUString& _rName );
  83
  84         void    fillList( LinkParticipant _eWhich, const Sequence< OUString >& _rFieldNames );
  85
  86         void    Show()
  87         {
  88             m_xDetailColumn->show();
  89             m_xMasterColumn->show();
  90         }
  91
  92     private:
  93         DECL_LINK( OnFieldNameChanged, weld::ComboBox&, void );
  94     };
  95
  96
  97     FieldLinkRow::FieldLinkRow(std::unique_ptr<weld::ComboBox> xDetailColumn,
  98                                std::unique_ptr<weld::ComboBox> xMasterColumn)
  99         : m_xDetailColumn(std::move(xDetailColumn))
 100         , m_xMasterColumn(std::move(xMasterColumn))
 101     {
 102         m_xDetailColumn->connect_changed( LINK( this, FieldLinkRow, OnFieldNameChanged ) );
 103         m_xMasterColumn->connect_changed( LINK( this, FieldLinkRow, OnFieldNameChanged ) );
 104     }
 105
 106     void FieldLinkRow::fillList( LinkParticipant _eWhich, const Sequence< OUString >& _rFieldNames )
 107     {
 108         weld::ComboBox* pBox = ( _eWhich == eDetailField ) ? m_xDetailColumn.get() : m_xMasterColumn.get();
 109
 110         const OUString* pFieldName    = _rFieldNames.getConstArray();
 111         const OUString* pFieldNameEnd = pFieldName + _rFieldNames.getLength();
 112         for ( ; pFieldName != pFieldNameEnd; ++pFieldName )
 113             pBox->append_text( *pFieldName );
 114     }
 115
 116     bool FieldLinkRow::GetFieldName( LinkParticipant _eWhich, OUString& /* [out] */ _rName ) const
 117     {
 118         const weld::ComboBox* pBox = ( _eWhich == eDetailField ) ? m_xDetailColumn.get() : m_xMasterColumn.get();
 119         _rName = pBox->get_active_text();
 120         return !_rName.isEmpty();
 121     }
 122
 123     void FieldLinkRow::SetFieldName( LinkParticipant _eWhich, const OUString& _rName )
 124     {
 125         weld::ComboBox* pBox = ( _eWhich == eDetailField ) ? m_xDetailColumn.get() : m_xMasterColumn.get();
 126         pBox->set_entry_text( _rName );
 127     }
 128
 129     IMPL_LINK_NOARG( FieldLinkRow, OnFieldNameChanged, weld::ComboBox&, void )
 130     {
 131         m_aLinkChangeHandler.Call( *this );
 132     }
 133
 134     //= FormLinkDialog
 135
 136     FormLinkDialog::FormLinkDialog(weld::Window* _pParent, const Reference< XPropertySet >& _rxDetailForm,
 137             const Reference< XPropertySet >& _rxMasterForm, const Reference< XComponentContext >& _rxContext,
 138             const OUString& _sExplanation,
 139             OUString _sDetailLabel,
 140             OUString _sMasterLabel)
 141         : GenericDialogController(_pParent, u"modules/spropctrlr/ui/formlinksdialog.ui"_ustr, u"FormLinks"_ustr)
 142         , m_xContext    ( _rxContext )
 143         , m_xDetailForm( _rxDetailForm )
 144         , m_xMasterForm( _rxMasterForm )
 145         , m_sDetailLabel(std::move(_sDetailLabel))
 146         , m_sMasterLabel(std::move(_sMasterLabel))
 147         , m_xExplanation(m_xBuilder->weld_label(u"explanationLabel"_ustr))
 148         , m_xDetailLabel(m_xBuilder->weld_label(u"detailLabel"_ustr))
 149         , m_xMasterLabel(m_xBuilder->weld_label(u"masterLabel"_ustr))
 150         , m_xRow1(std::make_unique<FieldLinkRow>(m_xBuilder->weld_combo_box(u"detailCombobox1"_ustr),
 151                                                  m_xBuilder->weld_combo_box(u"masterCombobox1"_ustr)))
 152         , m_xRow2(std::make_unique<FieldLinkRow>(m_xBuilder->weld_combo_box(u"detailCombobox2"_ustr),
 153                                                  m_xBuilder->weld_combo_box(u"masterCombobox2"_ustr)))
 154         , m_xRow3(std::make_unique<FieldLinkRow>(m_xBuilder->weld_combo_box(u"detailCombobox3"_ustr),
 155                                                  m_xBuilder->weld_combo_box(u"masterCombobox3"_ustr)))
 156         , m_xRow4(std::make_unique<FieldLinkRow>(m_xBuilder->weld_combo_box(u"detailCombobox4"_ustr),
 157                                                  m_xBuilder->weld_combo_box(u"masterCombobox4"_ustr)))
 158         , m_xOK(m_xBuilder->weld_button(u"ok"_ustr))
 159         , m_xSuggest(m_xBuilder->weld_button(u"suggestButton"_ustr))
 160     {
 161         m_xRow1->Show();
 162         m_xRow2->Show();
 163         m_xRow3->Show();
 164         m_xRow4->Show();
 165         m_xDialog->set_size_request(600, -1);
 166
 167         if ( !_sExplanation.isEmpty() )
 168             m_xExplanation->set_label(_sExplanation);
 169
 170         m_xSuggest->connect_clicked(LINK(this, FormLinkDialog, OnSuggest));
 171         m_xRow1->SetLinkChangeHandler( LINK( this, FormLinkDialog, OnFieldChanged ) );
 172         m_xRow2->SetLinkChangeHandler( LINK( this, FormLinkDialog, OnFieldChanged ) );
 173         m_xRow3->SetLinkChangeHandler( LINK( this, FormLinkDialog, OnFieldChanged ) );
 174         m_xRow4->SetLinkChangeHandler( LINK( this, FormLinkDialog, OnFieldChanged ) );
 175
 176         Application::PostUserEvent(LINK(this, FormLinkDialog, OnInitialize));
 177
 178         updateOkButton();
 179     }
 180
 181     FormLinkDialog::~FormLinkDialog()
 182     {
 183     }
 184
 185     void FormLinkDialog::commitLinkPairs()
 186     {
 187         // collect the field lists from the rows
 188         std::vector< OUString > aDetailFields; aDetailFields.reserve( 4 );
 189         std::vector< OUString > aMasterFields; aMasterFields.reserve( 4 );
 190
 191         const FieldLinkRow* aRows[] = {
 192             m_xRow1.get(), m_xRow2.get(), m_xRow3.get(), m_xRow4.get()
 193         };
 194
 195         for (const FieldLinkRow* aRow : aRows)
 196         {
 197             OUString sDetailField, sMasterField;
 198             aRow->GetFieldName( FieldLinkRow::eDetailField, sDetailField );
 199             aRow->GetFieldName( FieldLinkRow::eMasterField, sMasterField );
 200             if ( sDetailField.isEmpty() && sMasterField.isEmpty() )
 201                 continue;
 202
 203             aDetailFields.push_back( sDetailField );
 204             aMasterFields.push_back( sMasterField );
 205         }
 206
 207         // and set as property values
 208         try
 209         {
 210             if ( m_xDetailForm.is() )
 211             {
 212                 m_xDetailForm->setPropertyValue( PROPERTY_DETAILFIELDS, Any( Sequence< OUString >( aDetailFields.data(), aDetailFields.size() ) ) );
 213                 m_xDetailForm->setPropertyValue( PROPERTY_MASTERFIELDS, Any( Sequence< OUString >( aMasterFields.data(), aMasterFields.size() ) ) );
 214             }
 215         }
 216         catch( const Exception& )
 217         {
 218             TOOLS_WARN_EXCEPTION("extensions.propctrlr",
 219                                  "caught an exception while setting the properties!");
 220         }
 221     }
 222
 223     short FormLinkDialog::run()
 224     {
 225         short nResult = GenericDialogController::run();
 226
 227         if ( RET_OK == nResult )
 228             commitLinkPairs();
 229
 230         return nResult;
 231     }
 232
 233     void FormLinkDialog::initializeFieldLists()
 234     {
 235         Sequence< OUString > sDetailFields;
 236         getFormFields( m_xDetailForm, sDetailFields );
 237
 238         Sequence< OUString > sMasterFields;
 239         getFormFields( m_xMasterForm, sMasterFields );
 240
 241         FieldLinkRow* aRows[] = {
 242             m_xRow1.get(), m_xRow2.get(), m_xRow3.get(), m_xRow4.get()
 243         };
 244         for (FieldLinkRow* aRow : aRows)
 245         {
 246             aRow->fillList( FieldLinkRow::eDetailField, sDetailFields );
 247             aRow->fillList( FieldLinkRow::eMasterField, sMasterFields );
 248         }
 249
 250     }
 251
 252
 253     void FormLinkDialog::initializeColumnLabels()
 254     {
 255         // label for the detail form
 256         OUString sDetailType = getFormDataSourceType( m_xDetailForm );
 257         if ( sDetailType.isEmpty() )
 258         {
 259             if ( m_sDetailLabel.isEmpty() )
 260             {
 261                 m_sDetailLabel = PcrRes(STR_DETAIL_FORM);
 262             }
 263             sDetailType = m_sDetailLabel;
 264         }
 265         m_xDetailLabel->set_label( sDetailType );
 266
 267         // label for the master form
 268         OUString sMasterType = getFormDataSourceType( m_xMasterForm );
 269         if ( sMasterType.isEmpty() )
 270         {
 271             if ( m_sMasterLabel.isEmpty() )
 272             {
 273                 m_sMasterLabel = PcrRes(STR_MASTER_FORM);
 274             }
 275             sMasterType = m_sMasterLabel;
 276         }
 277         m_xMasterLabel->set_label( sMasterType );
 278     }
 279
 280     void FormLinkDialog::initializeFieldRowsFrom( std::vector< OUString >& _rDetailFields, std::vector< OUString >& _rMasterFields )
 281     {
 282         // our UI does allow 4 fields max
 283         _rDetailFields.resize( 4 );
 284         _rMasterFields.resize( 4 );
 285
 286         FieldLinkRow* aRows[] = {
 287             m_xRow1.get(), m_xRow2.get(), m_xRow3.get(), m_xRow4.get()
 288         };
 289         for ( sal_Int32 i = 0; i < 4; ++i )
 290         {
 291             aRows[ i ]->SetFieldName( FieldLinkRow::eDetailField, _rDetailFields[i] );
 292             aRows[ i ]->SetFieldName( FieldLinkRow::eMasterField, _rMasterFields[i] );
 293         }
 294     }
 295
 296
 297     void FormLinkDialog::initializeLinks()
 298     {
 299         try
 300         {
 301             Sequence< OUString > aDetailFields;
 302             Sequence< OUString > aMasterFields;
 303
 304             if ( m_xDetailForm.is() )
 305             {
 306                 m_xDetailForm->getPropertyValue( PROPERTY_DETAILFIELDS ) >>= aDetailFields;
 307                 m_xDetailForm->getPropertyValue( PROPERTY_MASTERFIELDS ) >>= aMasterFields;
 308             }
 309
 310             std::vector< OUString > aDetailFields1;
 311             comphelper::sequenceToContainer(aDetailFields1, aDetailFields);
 312             std::vector< OUString > aMasterFields1;
 313             comphelper::sequenceToContainer(aMasterFields1, aMasterFields);
 314             initializeFieldRowsFrom( aDetailFields1, aMasterFields1 );
 315         }
 316         catch( const Exception& )
 317         {
 318             TOOLS_WARN_EXCEPTION( "extensions.propctrlr", "FormLinkDialog::initializeLinks" );
 319         }
 320     }
 321
 322
 323     void FormLinkDialog::updateOkButton()
 324     {
 325         // in all rows, there must be either two valid selections, or none at all
 326         // If there is at least one row with exactly one valid selection, then the
 327         // OKButton needs to be disabled
 328         bool bEnable = true;
 329
 330         const FieldLinkRow* aRows[] = {
 331             m_xRow1.get(), m_xRow2.get(), m_xRow3.get(), m_xRow4.get()
 332         };
 333
 334         for ( sal_Int32 i = 0; ( i < 4 ) && bEnable; ++i )
 335         {
 336             OUString sNotInterestedInRightNow;
 337             if  (  aRows[ i ]->GetFieldName( FieldLinkRow::eDetailField, sNotInterestedInRightNow )
 338                 != aRows[ i ]->GetFieldName( FieldLinkRow::eMasterField, sNotInterestedInRightNow )
 339                 )
 340                 bEnable = false;
 341         }
 342
 343         m_xOK->set_sensitive(bEnable);
 344     }
 345
 346     OUString FormLinkDialog::getFormDataSourceType( const Reference< XPropertySet >& _rxForm )
 347     {
 348         OUString sReturn;
 349         if ( !_rxForm.is() )
 350             return sReturn;
 351
 352         try
 353         {
 354             sal_Int32       nCommandType = CommandType::COMMAND;
 355             OUString sCommand;
 356
 357             _rxForm->getPropertyValue( PROPERTY_COMMANDTYPE ) >>= nCommandType;
 358             _rxForm->getPropertyValue( PROPERTY_COMMAND     ) >>= sCommand;
 359
 360             if  (  ( nCommandType == CommandType::TABLE )
 361                 || ( nCommandType == CommandType::QUERY )
 362                 )
 363                 sReturn = sCommand;
 364         }
 365         catch( const Exception& )
 366         {
 367             TOOLS_WARN_EXCEPTION( "extensions.propctrlr", "FormLinkDialog::getFormDataSourceType" );
 368         }
 369         return sReturn;
 370     }
 371
 372     void FormLinkDialog::getFormFields( const Reference< XPropertySet >& _rxForm, Sequence< OUString >& /* [out] */ _rNames ) const
 373     {
 374         _rNames.realloc( 0 );
 375
 376         ::dbtools::SQLExceptionInfo aErrorInfo;
 377         OUString sCommand;
 378         try
 379         {
 380             weld::WaitObject aWaitCursor(m_xDialog.get());
 381
 382             OSL_ENSURE( _rxForm.is(), "FormLinkDialog::getFormFields: invalid form!" );
 383
 384             sal_Int32       nCommandType = CommandType::COMMAND;
 385
 386             _rxForm->getPropertyValue( PROPERTY_COMMANDTYPE ) >>= nCommandType;
 387             _rxForm->getPropertyValue( PROPERTY_COMMAND     ) >>= sCommand;
 388
 389             Reference< XConnection > xConnection;
 390             ensureFormConnection( _rxForm, xConnection );
 391
 392             _rNames = ::dbtools::getFieldNamesByCommandDescriptor(
 393                 xConnection,
 394                 nCommandType,
 395                 sCommand,
 396                 &aErrorInfo
 397             );
 398         }
 399         catch (const SQLContext& e)    { aErrorInfo = e; }
 400         catch (const SQLWarning& e)    { aErrorInfo = e; }
 401         catch (const SQLException& e ) { aErrorInfo = e; }
 402         catch( const Exception& )
 403         {
 404             TOOLS_WARN_EXCEPTION( "extensions.propctrlr", "FormLinkDialog::getFormFields: caught a non-SQL exception!" );
 405         }
 406
 407         if ( !aErrorInfo.isValid() )
 408             return;
 409
 410         OUString sErrorMessage;
 411         {
 412             sErrorMessage = PcrRes(STR_ERROR_RETRIEVING_COLUMNS);
 413             sErrorMessage = sErrorMessage.replaceFirst("#", sCommand);
 414         }
 415
 416         SQLContext aContext(sErrorMessage, {}, {}, 0, aErrorInfo.get(), {});
 417         ::dbtools::showError(aContext, m_xDialog->GetXWindow(), m_xContext);
 418     }
 419
 420     void FormLinkDialog::ensureFormConnection( const Reference< XPropertySet >& _rxFormProps, Reference< XConnection >& /* [out] */ _rxConnection ) const
 421     {
 422         OSL_PRECOND( _rxFormProps.is(), "FormLinkDialog::ensureFormConnection: invalid form!" );
 423         if ( !_rxFormProps.is() )
 424             return;
 425         if ( _rxFormProps->getPropertySetInfo()->hasPropertyByName(PROPERTY_ACTIVE_CONNECTION) )
 426             _rxConnection.set(_rxFormProps->getPropertyValue(PROPERTY_ACTIVE_CONNECTION),UNO_QUERY);
 427
 428         if ( !_rxConnection.is() )
 429             _rxConnection = ::dbtools::connectRowset( Reference< XRowSet >( _rxFormProps, UNO_QUERY ), m_xContext, nullptr );
 430     }
 431
 432
 433     void FormLinkDialog::getConnectionMetaData( const Reference< XPropertySet >& _rxFormProps, Reference< XDatabaseMetaData >& /* [out] */ _rxMeta )
 434     {
 435         if ( _rxFormProps.is() )
 436         {
 437             Reference< XConnection > xConnection;
 438             if ( !::dbtools::isEmbeddedInDatabase( _rxFormProps, xConnection ) )
 439                 _rxFormProps->getPropertyValue( PROPERTY_ACTIVE_CONNECTION ) >>= xConnection;
 440             if ( xConnection.is() )
 441                 _rxMeta = xConnection->getMetaData();
 442         }
 443     }
 444
 445
 446     Reference< XPropertySet > FormLinkDialog::getCanonicUnderlyingTable( const Reference< XPropertySet >& _rxFormProps ) const
 447     {
 448         Reference< XPropertySet > xTable;
 449         try
 450         {
 451             Reference< XTablesSupplier > xTablesInForm( ::dbtools::getCurrentSettingsComposer( _rxFormProps, m_xContext, nullptr ), UNO_QUERY );
 452             Reference< XNameAccess > xTables;
 453             if ( xTablesInForm.is() )
 454                 xTables = xTablesInForm->getTables();
 455             Sequence< OUString > aTableNames;
 456             if ( xTables.is() )
 457                 aTableNames = xTables->getElementNames();
 458
 459             if ( aTableNames.getLength() == 1 )
 460             {
 461                 xTables->getByName( aTableNames[ 0 ] ) >>= xTable;
 462                 OSL_ENSURE( xTable.is(), "FormLinkDialog::getCanonicUnderlyingTable: invalid table!" );
 463             }
 464         }
 465         catch( const Exception& )
 466         {
 467             TOOLS_WARN_EXCEPTION( "extensions.propctrlr", "FormLinkDialog::getCanonicUnderlyingTable" );
 468         }
 469         return xTable;
 470     }
 471
 472
 473     bool FormLinkDialog::getExistingRelation( const Reference< XPropertySet >& _rxLHS, const Reference< XPropertySet >& /*_rxRHS*/,
 474             // TODO: fix the usage of _rxRHS. This is issue #i81956#.
 475         std::vector< OUString >& _rLeftFields, std::vector< OUString >& _rRightFields )
 476     {
 477         try
 478         {
 479             Reference< XKeysSupplier > xSuppKeys( _rxLHS, UNO_QUERY );
 480             Reference< XIndexAccess >  xKeys;
 481             if ( xSuppKeys.is() )
 482                 xKeys = xSuppKeys->getKeys();
 483
 484             if ( xKeys.is() )
 485             {
 486                 Reference< XPropertySet >     xKey;
 487                 Reference< XColumnsSupplier > xKeyColSupp( xKey, UNO_QUERY );
 488                 Reference< XIndexAccess >     xKeyColumns;
 489                 Reference< XPropertySet >     xKeyColumn;
 490                 OUString sColumnName, sRelatedColumnName;
 491
 492                 const sal_Int32 keyCount = xKeys->getCount();
 493                 for ( sal_Int32 key = 0; key < keyCount; ++key )
 494                 {
 495                     xKeys->getByIndex( key ) >>= xKey;
 496                     sal_Int32 nKeyType = 0;
 497                     xKey->getPropertyValue(u"Type"_ustr) >>= nKeyType;
 498                     if ( nKeyType != KeyType::FOREIGN )
 499                         continue;
 500
 501                     xKeyColumns.clear();
 502                     xKeyColSupp.set(xKey, css::uno::UNO_QUERY);
 503                     if ( xKeyColSupp.is() )
 504                         xKeyColumns.set(xKeyColSupp->getColumns(), css::uno::UNO_QUERY);
 505                     OSL_ENSURE( xKeyColumns.is(), "FormLinkDialog::getExistingRelation: could not obtain the columns for the key!" );
 506
 507                     if ( !xKeyColumns.is() )
 508                         continue;
 509
 510                     const sal_Int32 columnCount = xKeyColumns->getCount();
 511                     _rLeftFields.resize( columnCount );
 512                     _rRightFields.resize( columnCount );
 513                     for ( sal_Int32 column = 0; column < columnCount; ++column )
 514                     {
 515                         xKeyColumn.clear();
 516                         xKeyColumns->getByIndex( column ) >>= xKeyColumn;
 517                         OSL_ENSURE( xKeyColumn.is(), "FormLinkDialog::getExistingRelation: invalid key column!" );
 518                         if ( xKeyColumn.is() )
 519                         {
 520                             xKeyColumn->getPropertyValue( PROPERTY_NAME ) >>= sColumnName;
 521                             xKeyColumn->getPropertyValue(u"RelatedColumn"_ustr) >>= sRelatedColumnName;
 522
 523                             _rLeftFields[ column ]  = sColumnName;
 524                             _rRightFields[ column ] = sRelatedColumnName;
 525                         }
 526                     }
 527                 }
 528             }
 529         }
 530         catch( const Exception& )
 531         {
 532             TOOLS_WARN_EXCEPTION( "extensions.propctrlr", "FormLinkDialog::getExistingRelation" );
 533         }
 534
 535         return ( !_rLeftFields.empty() ) && ( !_rLeftFields[ 0 ].isEmpty() );
 536     }
 537
 538
 539     void FormLinkDialog::initializeSuggest()
 540     {
 541         if ( !m_xDetailForm.is() || !m_xMasterForm.is() )
 542             return;
 543
 544         try
 545         {
 546             // only show the button when both forms are based on the same data source
 547             OUString sMasterDS, sDetailDS;
 548             m_xMasterForm->getPropertyValue( PROPERTY_DATASOURCE ) >>= sMasterDS;
 549             m_xDetailForm->getPropertyValue( PROPERTY_DATASOURCE ) >>= sDetailDS;
 550             bool bEnable = ( sMasterDS == sDetailDS );
 551
 552             // only show the button when the connection supports relations
 553             if ( bEnable )
 554             {
 555                 Reference< XDatabaseMetaData > xMeta;
 556                 getConnectionMetaData( m_xDetailForm, xMeta );
 557                 OSL_ENSURE( xMeta.is(), "FormLinkDialog::initializeSuggest: unable to retrieve the meta data for the connection!" );
 558                 try
 559                 {
 560                     bEnable = xMeta.is() && xMeta->supportsIntegrityEnhancementFacility();
 561                 }
 562                 catch(const Exception&)
 563                 {
 564                     bEnable = false;
 565                 }
 566             }
 567
 568             // only enable the button if there is a "canonic" table underlying both forms
 569             Reference< XPropertySet > xDetailTable, xMasterTable;
 570             if ( bEnable )
 571             {
 572                 xDetailTable = getCanonicUnderlyingTable( m_xDetailForm );
 573                 xMasterTable = getCanonicUnderlyingTable( m_xMasterForm );
 574                 bEnable = xDetailTable.is() && xMasterTable.is();
 575             }
 576
 577             // only enable the button if there is a relation between both tables
 578             m_aRelationDetailColumns.clear();
 579             m_aRelationMasterColumns.clear();
 580             if ( bEnable )
 581             {
 582                 bEnable = getExistingRelation( xDetailTable, xMasterTable, m_aRelationDetailColumns, m_aRelationMasterColumns );
 583                 SAL_WARN_IF( m_aRelationMasterColumns.size() != m_aRelationDetailColumns.size(),
 584                     "extensions.propctrlr",
 585                     "FormLinkDialog::initializeSuggest: nonsense!" );
 586                 if ( m_aRelationMasterColumns.empty() )
 587                 {   // okay, there is no relation "pointing" (via a foreign key) from the detail table to the master table
 588                     // but perhaps the other way round (would make less sense, but who knows ...)
 589                     bEnable = getExistingRelation( xMasterTable, xDetailTable, m_aRelationMasterColumns, m_aRelationDetailColumns );
 590                 }
 591             }
 592
 593             // only enable the button if the relation contains at most 4 field pairs
 594             if ( bEnable )
 595             {
 596                 bEnable = ( m_aRelationMasterColumns.size() <= 4 );
 597             }
 598
 599             m_xSuggest->set_sensitive(bEnable);
 600         }
 601         catch( const Exception& )
 602         {
 603             TOOLS_WARN_EXCEPTION( "extensions.propctrlr", "FormLinkDialog::initializeSuggest" );
 604         }
 605     }
 606
 607     IMPL_LINK_NOARG( FormLinkDialog, OnSuggest, weld::Button&, void )
 608     {
 609         initializeFieldRowsFrom( m_aRelationDetailColumns, m_aRelationMasterColumns );
 610     }
 611
 612     IMPL_LINK_NOARG( FormLinkDialog, OnFieldChanged, FieldLinkRow&, void )
 613     {
 614         updateOkButton();
 615     }
 616
 617     IMPL_LINK_NOARG( FormLinkDialog, OnInitialize, void*, void )
 618     {
 619         initializeColumnLabels();
 620         initializeFieldLists();
 621         initializeLinks();
 622         initializeSuggest();
 623     }
 624
 625 }   // namespace pcr
 626
 627
 628 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */