change_history_access.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 change_history_access_1_0_0{
            
            var                           $NativeTable = '`umx_change_history`';
            
            var                           $Database = false;
            var                           $Link = false;
            var                           $LinkDictionary = false;
            var                           $Security = false;
            var                           $UserAlgorithms = false;
            
            function                __construct()
            {
                  try
                  {
                        $this->Database = get_package( 'database' , 'last' , __FILE__ );
                        $this->Link = get_package( 'link' , 'last' , __FILE__ );
                        $this->LinkDictionary = get_package( 'link::link_dictionary' , 'last' , __FILE__ );
                        $this->Security = get_package( 'security' , 'last' , __FILE__ );
                        $this->UserAlgorithms = get_package( 'user::user_algorithms' , 'last' , __FILE__ );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            private function  get_entry( $id , $ObjectType , $Name )
            {
                  try
                  {
                        $this->Database->query_as( DB_OBJECT );
                        
                        $Entry = $this->Database->select( 
                              $this->NativeTable.'.field_value' , 
                              $this->NativeTable , 
                              $this->NativeTable.".object_id = $id AND ".$this->NativeTable.".object_type = $ObjectType AND ".
                                    $this->NativeTable.".field_name LIKE '".$Name."' ORDER BY id DESC LIMIT 1"
                        );

                        return( $Entry );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                get_last_field_vlue( $id , $ObjectType , $Name )
            {
                  try
                  {
                        $id = $this->Security->get( $id , 'integer' );
                        $ObjectType = $this->Security->get( $ObjectType , 'integer' );;
                        $Name = $this->Security->get( $Name , 'command' );
                        
                        $Entry = $this->get_entry( $id , $ObjectType , $Name );

                        if( isset( $Entry[ 0 ] ) )
                        {
                              return( get_field( $Entry[ 0 ] , 'field_value' ) );
                        }
                        
                        return( false );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                need_save_field( $id , $ObjectType , $Name , $NewValue )
            {
                  try
                  {
                        $Value = $this->get_last_field_vlue( $id , $ObjectType , $Name );

                        return( $Value === false || ( $Value == $NewValue ? false : true ) );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                get_author()
            {
                  try
                  {
                        $User = $this->UserAlgorithms->get_user();
                        
                        return( get_field( $User , 'id' ) );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                add_to_history( $id , $ObjectType , $Record )
            {
                  try
                  {
                        $id = $this->Security->get( $id , 'integer' );
                        $Record = $this->Security->get( $Record , 'string' );
                        $ObjectType = $this->LinkDictionary->get_link_type( 'history' , $ObjectType );
                        $Author = $this->get_author();

                        foreach( $Record as $Name => $Value )
                        {
                              if( $this->need_save_field( $id , $ObjectType , $Name , $Value ) )
                              {
                                    $this->Database->insert( $this->NativeTable , 
                                          'object_id , object_type , field_name , field_value , creation_date , author' , 
                                          "$id , $ObjectType , '$Name' , '$Value' , NOW() , $Author"
                                    );

                                    $this->Database->commit();
                              }
                        }
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                get_history( $id , $ObjectType )
            {
                  try
                  {
                        $id = $this->Security->get( $id , 'integer' );
                        $ObjectType = $this->LinkDictionary->get_link_type( 'history' , $ObjectType );
                        
                        $this->Database->query_as( DB_OBJECT );
                        
                        return( 
                              $this->Database->select( 
                                    $this->NativeTable.'.* , umx_user.login AS author_name' , 
                                    $this->NativeTable.' , umx_user' , 
                                    $this->NativeTable.".author = umx_user.id AND ".$this->NativeTable.".object_id = $id AND ".
                                          $this->NativeTable.".object_type = $ObjectType ORDER BY id ASC"
                              )
                        );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
      }

?>