ordering.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 ordering_1_0_0{
            
            var                           $Database = false;
            var                           $Security = false;
            
            var                           $Table;
            
            function                set_table_name( $NewTableName )
            {
                  $this->Table = $NewTableName;
            }

            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                get_item( $id , $Condition = '1 = 1' )
            {
                  try
                  {
                        $id = $this->Security->get( $id , 'integer' );
                        
                        $Items = $this->Database->select( '*' , $this->Table , "id = $id AND $Condition" );
                        
                        if( count( $Items ) == 1 )
                        {
                              return( $Items[ 0 ] );
                        }
                        
                        throw( new Exception( "An error occured while getting item".mysql_error() ) );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                get_next_order_item( $Order , $Condition = '1 = 1' )
            {
                  try
                  {
                        $Order = $this->Security->get( $Order , 'string' );
                        
                        $NextItem = $this->Database->select( 
                              '*' ,  $this->Table , 
                              "`order` >= $Order AND $Condition ORDER BY `order` ASC LIMIT 0 , 2" 
                        );

                        if( isset( $NextItem[ 1 ] ) )
                        {
                              return( $NextItem[ 1 ] );
                        }
                        
                        return( false );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                get_prev_order_item( $Order , $Condition = '1 = 1' )
            {
                  try
                  {
                        $Order = $this->Security->get( $Order , 'string' );
                        
                        $PrevItem = $this->Database->select( 
                              '*' , $this->Table ,
                              "`order` <= $Order AND $Condition ORDER BY `order` DESC LIMIT 0 , 2"
                        );
                        
                        if( isset( $PrevItem[ 1 ] ) )
                        {
                              return( $PrevItem[ 1 ] );
                        }
                        
                        return( false );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }

            function                swap_items( $Item1 , $Item2 , $Condition = '1 = 1' )
            {
                  try
                  {
                        $this->Database->update( 
                              $this->Table , array( '`order`' ) , 
                              get_field( $Item2 , 'order' ) , 
                              "id = ".get_field( $Item1 , 'id' )
                        );
                        
                        $this->Database->update( 
                              $this->Table , array( '`order`' ) , 
                              get_field( $Item1 , 'order' ) , 
                              "id = ".get_field( $Item2 , 'id' )
                        );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                shift_next( $id , $Condition = '1 = 1' )
            {
                  try
                  {
                        $id = $this->Security->get( $id , 'integer' );
                        
                        $Item = $this->get_item( $id , $Condition );
                        $NextItem = $this->get_next_order_item( $Item[ 'order' ] , $Condition );
                        
                        if( $NextItem === false )
                        {
                              return;
                        }

                        $this->swap_items( $Item , $NextItem , $Condition );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                shift_prev( $id , $Condition = '1 = 1' )
            {
                  try
                  {
                        $id = $this->Security->get( $id , 'integer' );
                        
                        $Item = $this->get_item( $id , $Condition );
                        $PrevItem = $this->get_prev_order_item( $Item[ 'order' ] , $Condition );
                        
                        if( $PrevItem === false )
                        {
                              return;
                        }

                        $this->swap_items( $Item , $PrevItem , $Condition );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
      }

?>