GridSortModel (Tapestry API - 5.7.2)乐学网一站式学习平台

```
public interface GridSortModel
```
Models the sorting applied to the a GridDataSource.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`clear()`
`ColumnSort`	`getColumnSort(String columnId)`	Identifies how (or if) a column is sorted.
`List<SortConstraint>`	`getSortConstraints()`	Returns a list of sort constraints, identifying which columns are sorted, and how.
`void`	`updateSort(String columnId)`	Updates the column sort.

- Method Detail
  - getColumnSort
```
ColumnSort getColumnSort(String columnId)
```
    Identifies how (or if) a column is sorted.
    
    Parameters:
    
    columnId -
    
    Returns:
    
    the sort for the indicated column or ColumnSort.UNSORTED if the column is not used for sorting
  - updateSort
```
void updateSort(String columnId)
```
    Updates the column sort. The receiver determines how to handle the sort request.
    
    Parameters:
    
    columnId - property id of column to sort on
  - getSortConstraints
```
List<SortConstraint> getSortConstraints()
```
    Returns a list of sort constraints, identifying which columns are sorted, and how. May return an empty list (but won't return null).
    
    See Also:
    
    GridDataSource.prepare(int, int, java.util.List)
  - clear
```
void clear()
```