src/DAL/Join.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2008 by Sverre Rabbelier                                *
   3  *   sverre@rabbelier.nl                                                   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 3 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20
  21 #include "Join.h"
  22 #include "KeyImpl.h"
  23 #include "KeyValue.h"
  24 #include "TableImpl.h"
  25 #include "FieldImpl.h"
  26
  27 Join::Join(TableImplPtr nativeTable, TableImplPtr joinTable, KeyImplPtr nativeKey, KeyImplPtr foreignKey) :
  28 m_nativeTable(nativeTable),
  29 m_joinTable(joinTable),
  30 m_nativeKey(nativeKey),
  31 m_foreignKey(foreignKey)
  32 {
  33         Assert(nativeTable);
  34         Assert(joinTable);
  35         Assert(nativeKey);
  36         Assert(foreignKey);
  37
  38         Assert(nativeKey->getTable() == m_nativeTable);
  39         Assert(foreignKey->getTable() == joinTable);
  40
  41         TableImplPtr nnt = nativeKey->getTable();                       // native       native  table
  42         TableImplPtr nft = nativeKey->getForeignTable();        // native       foreign table
  43         TableImplPtr fnt = foreignKey->getTable();                      // foreign      native  table
  44         TableImplPtr fft = foreignKey->getForeignTable();       // foreign      foreign table
  45
  46         bool nfk = nativeKey->isForeignKey();                           // native       foreign key
  47         bool ffk = foreignKey->isForeignKey();                          // foreign      foreign key
  48
  49         /**
  50                 A -> B
  51                 A <- AB
  52          */
  53
  54         bool AtoB               = (nft == fnt && nfk && !ffk); // A -> B
  55         bool AfromAB    = (fft == nnt && nnt == nft); // A <- AB
  56
  57         Assert(AtoB || AfromAB);
  58 }
  59
  60 Join::~Join()
  61 {
  62
  63 }
  64
  65 TableImplPtr Join::getNativeTable() const
  66 {
  67         return m_nativeTable;
  68 }
  69
  70 TableImplPtr Join::getJoinTable() const
  71 {
  72         return m_joinTable;
  73 }
  74
  75 KeyImplPtr Join::getNativeKey() const
  76 {
  77         return m_nativeKey;
  78 }
  79
  80 KeyImplPtr Join::getForeignKey() const
  81 {
  82         return m_foreignKey;
  83 }