Dataface/RelationshipTool.php

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<?php
/*-------------------------------------------------------------------------------
 * Xataface Web Application Framework
 * Copyright (C) 2005-2008 Web Lite Solutions Corp (shannah@sfu.ca)
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *-------------------------------------------------------------------------------
 */
require_once 'SQL/Parser.php';

class Dataface_RelationshipTool {


        var $_table;
        var $_parser;
        
        function Dataface_RelationshipTool($tablename){
                $this->_table =& Dataface_Table::loadTable($tablename);
                $this->_parser = new Sql_parser();
        }
        
        
        public static function getInstance($tablename){
                static $instances = array();
                if (!isset($instances[$tablename]) ){
                        $instances[$tablename] = new Dataface_RelationshipTool($tablename);
                }
                return $instances[$tablename];
        }
        
        

        function isRemoveable($relationship_name){}
        function isLinkable($relationship_name){}
        function isUnlinkable($relationship_name){}
        
        function isAddable($relationship_name){
                $r =& $this->_table->getRelationship($relationship_name);
                $sql = $this->_table->parseString($r['sql']);
                echo $sql;
                $struct = $this->_parser->parse($sql);
                print_r($struct);
                
                $where_clause = $struct['where_clause'];
                
                
        }
                        
                        
                        
                



}