chronological.php

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<?php

      /*
      *     This source code is a part of the Ultimix Project. 
      *     It is distributed under BSD license. All other third side source code (like tinyMCE) is distributed under 
      *     it's own license wich could be found from the corresponding files or sources. 
      *     This source code is provided "as is" without any warranties or garanties.
      *
      *     Have a nice day!
      *
      *     @url http://ultimix.sorceforge.net
      *
      *     @author Alexey "gdever" Dodonov
      */
      
      class chronological_1_0_0{
            
            var                           $Database = false;
            var                           $Security = false;
            
            function                __construct()
            {
                  try
                  {
                        $this->Database = get_package( 'database' , 'last' , __FILE__ );
                        $this->Security = get_package( 'security' , 'last' , __FILE__ );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                create_record( $MasterId , $DataAccess )
            {
                  try
                  {
                        $MasterId = $this->Security->get( $MasterId , 'integer' );
                        
                        $Time = time();
                        
                        $this->Database->update( 
                              $DataAccess->NativeTable , 
                              array( 'date_from' , 'date_to' , 'group_id' ) , 
                              array( $Time , $Time + 100 * 365 * 24 * 60 * 60 , $MasterId ) , 
                              "id = $MasterId"
                        );
                        
                        $this->Database->commit();
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            private function close_old_version( $MasterId , $Changes , $DataAccess )
            {
                  try
                  {
                        $MasterId = $this->Security->get( $MasterId , 'integer' );                    
                        $Time = time();
                        
                        $Records = $this->Database->select( 'MIN( id ) AS min_id' , $DataAccess->NativeTable );
                        $MinId = get_field( $Records[ 0 ] , 'min_id' , 0 ) - 1;
                        $this->Database->update(
                              $DataAccess->NativeTable , array( 'id' , 'date_to' ) , 
                              array( $MinId , $Time - 1 ) , "id = $MasterId"
                        );
                        $this->Database->commit();
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            private function  create_new_version( $MasterId , $Changes , $DataAccess )
            {
                  try
                  {
                        $OriginalRecord = $DataAccess->unsafe_select( "id = $MasterId" );
                        $ChangedRecord = extend( $OriginalRecord[ 0 ] , $Changes );
                        $NewId = $DataAccess->create( $ChangedRecord );                   
                        $this->Database->update(
                              $DataAccess->NativeTable , array( 'id' , 'date_from' , 'date_to' , 'group_id' ) , 
                              array( $MasterId , $Time , $Time + 100 * 365 * 24 * 60 * 60 , $MasterId ) , "id = $NewId"
                        );
                        $this->Database->commit();
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                update_record( $MasterId , $Changes , $DataAccess )
            {
                  try
                  {
                        $this->Database->lock( array( $DataAccess->NativeTable ) , array( 'WRITE' ) );
                        
                        $this->close_old_version( $MasterId , $Changes , $DataAccess );
                        
                        $this->create_new_version( $MasterId , $Changes , $DataAccess );
                        
                        $this->Database->unlock();
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                close_record( $MasterId , $DataAccess )
            {
                  try
                  {
                        $MasterId = $this->Security->get( $MasterId , 'integer_list' );
                        
                        $this->Database->update( 
                              $DataAccess->NativeTable , array( 'date_to' ) , array( time() ) , 
                              "id IN ( $MasterId ) AND ( ".$DataAccess->AddLimitations." )"
                        );
                        
                        $this->Database->commit();
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
      }

?>