Class RowSorter<M>
- java.lang.Object
-
- javax.swing.RowSorter<M>
- Type Parameters:
-
M
- the type of the underlying model
- Direct Known Subclasses:
DefaultRowSorter
public abstract class RowSorter<M> extends Object
RowSorter
provides the basis for sorting and filtering. Beyond creating and installing a RowSorter
, you very rarely need to interact with one directly. Refer to TableRowSorter
for a concrete implementation of RowSorter
for JTable
.
RowSorter
's primary role is to provide a mapping between two coordinate systems: that of the view (for example a JTable
) and that of the underlying data source, typically a model.
The view invokes the following methods on the RowSorter
:
-
toggleSortOrder
— The view invokes this when the appropriate user gesture has occurred to trigger a sort. For example, the user clicked a column header in a table. - One of the model change methods — The view invokes a model change method when the underlying model has changed. There may be order dependencies in how the events are delivered, so a
RowSorter
should not update its mapping until one of these methods is invoked.
convertRowIndexToModel
, convertRowIndexToView
and getViewRowCount
methods, these methods need to be fast. RowSorter
provides notification of changes by way of RowSorterListener
. Two types of notification are sent:
-
RowSorterEvent.Type.SORT_ORDER_CHANGED
— notifies listeners that the sort order has changed. This is typically followed by a notification that the sort has changed. -
RowSorterEvent.Type.SORTED
— notifies listeners that the mapping maintained by theRowSorter
has changed in some way.
RowSorter
implementations typically don't have a one-to-one mapping with the underlying model, but they can. For example, if a database does the sorting, toggleSortOrder
might call through to the database (on a background thread), and override the mapping methods to return the argument that is passed in. Concrete implementations of RowSorter
need to reference a model such as TableModel
or ListModel
. The view classes, such as JTable
and JList
, will also have a reference to the model. To avoid ordering dependencies, RowSorter
implementations should not install a listener on the model. Instead the view class will call into the RowSorter
when the model changes. For example, if a row is updated in a TableModel
JTable
invokes rowsUpdated
. When the model changes, the view may call into any of the following methods: modelStructureChanged
, allRowsChanged
, rowsInserted
, rowsDeleted
and rowsUpdated
.
- Since:
- 1.6
- See Also:
TableRowSorter
Nested Class Summary
Modifier and Type | Class | Description |
---|---|---|
static class | RowSorter.SortKey | SortKey describes the sort order for a particular column. |
Constructor Summary
Constructor | Description |
---|---|
RowSorter() | Creates a |
Method Summary
Modifier and Type | Method | Description |
---|---|---|
void | addRowSorterListener(RowSorterListener l) | Adds a |
abstract void | allRowsChanged() | Invoked when the contents of the underlying model have completely changed. |
abstract int | convertRowIndexToModel(int index) | Returns the location of |
abstract int | convertRowIndexToView(int index) | Returns the location of |
protected void | fireRowSorterChanged(int[] lastRowIndexToModel) | Notifies listener that the mapping has changed. |
protected void | fireSortOrderChanged() | Notifies listener that the sort order has changed. |
abstract M | getModel() | Returns the underlying model. |
abstract int | getModelRowCount() | Returns the number of rows in the underlying model. |
abstract List<? extends RowSorter.SortKey> | getSortKeys() | Returns the current sort keys. |
abstract int | getViewRowCount() | Returns the number of rows in the view. |
abstract void | modelStructureChanged() | Invoked when the underlying model structure has completely changed. |
void | removeRowSorterListener(RowSorterListener l) | Removes a |
abstract void | rowsDeleted(int firstRow,
int endRow) | Invoked when rows have been deleted from the underlying model in the specified range (inclusive). |
abstract void | rowsInserted(int firstRow,
int endRow) | Invoked when rows have been inserted into the underlying model in the specified range (inclusive). |
abstract void | rowsUpdated(int firstRow,
int endRow) | Invoked when rows have been changed in the underlying model between the specified range (inclusive). |
abstract void | rowsUpdated(int firstRow,
int endRow,
int column) | Invoked when the column in the rows have been updated in the underlying model between the specified range. |
abstract void | setSortKeys(List<? extends RowSorter.SortKey> keys) | Sets the current sort keys. |
abstract void | toggleSortOrder(int column) | Reverses the sort order of the specified column. |
Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Constructor Detail
RowSorter
public RowSorter()
Creates a RowSorter
.
Method Detail
getModel
public abstract M getModel()
Returns the underlying model.
- Returns:
- the underlying model
toggleSortOrder
public abstract void toggleSortOrder(int column)
Reverses the sort order of the specified column. It is up to subclasses to provide the exact behavior when invoked. Typically this will reverse the sort order from ascending to descending (or descending to ascending) if the specified column is already the primary sorted column; otherwise, makes the specified column the primary sorted column, with an ascending sort order. If the specified column is not sortable, this method has no effect.
If this results in changing the sort order and sorting, the appropriate RowSorterListener
notification will be sent.
- Parameters:
-
column
- the column to toggle the sort ordering of, in terms of the underlying model - Throws:
-
IndexOutOfBoundsException
- if column is outside the range of the underlying model
convertRowIndexToModel
public abstract int convertRowIndexToModel(int index)
Returns the location of index
in terms of the underlying model. That is, for the row index
in the coordinates of the view this returns the row index in terms of the underlying model.
- Parameters:
-
index
- the row index in terms of the underlying view - Returns:
- row index in terms of the view
- Throws:
-
IndexOutOfBoundsException
- ifindex
is outside the range of the view
convertRowIndexToView
public abstract int convertRowIndexToView(int index)
Returns the location of index
in terms of the view. That is, for the row index
in the coordinates of the underlying model this returns the row index in terms of the view.
- Parameters:
-
index
- the row index in terms of the underlying model - Returns:
- row index in terms of the view, or -1 if index has been filtered out of the view
- Throws:
-
IndexOutOfBoundsException
- ifindex
is outside the range of the model
setSortKeys
public abstract void setSortKeys(List<? extends RowSorter.SortKey> keys)
Sets the current sort keys.
- Parameters:
-
keys
- the newSortKeys
;null
is a shorthand for specifying an empty list, indicating that the view should be unsorted
getSortKeys
public abstract List<? extends RowSorter.SortKey> getSortKeys()
Returns the current sort keys. This must return a
non-null List
and may return an unmodifiable List
. If you need to change the sort keys, make a copy of the returned List
, mutate the copy and invoke setSortKeys
with the new list.
- Returns:
- the current sort order
getViewRowCount
public abstract int getViewRowCount()
Returns the number of rows in the view. If the contents have been filtered this might differ from the row count of the underlying model.
- Returns:
- number of rows in the view
- See Also:
getModelRowCount()
getModelRowCount
public abstract int getModelRowCount()
Returns the number of rows in the underlying model.
- Returns:
- number of rows in the underlying model
- See Also:
getViewRowCount()
modelStructureChanged
public abstract void modelStructureChanged()
Invoked when the underlying model structure has completely changed. For example, if the number of columns in a TableModel
changed, this method would be invoked.
You normally do not call this method. This method is public to allow view classes to call it.
allRowsChanged
public abstract void allRowsChanged()
Invoked when the contents of the underlying model have completely changed. The structure of the table is the same, only the contents have changed. This is typically sent when it is too expensive to characterize the change in terms of the other methods.
You normally do not call this method. This method is public to allow view classes to call it.
rowsInserted
public abstract void rowsInserted(int firstRow, int endRow)
Invoked when rows have been inserted into the underlying model in the specified range (inclusive).
The arguments give the indices of the effected range. The first argument is in terms of the model before the change, and must be less than or equal to the size of the model before the change. The second argument is in terms of the model after the change and must be less than the size of the model after the change. For example, if you have a 5-row model and add 3 items to the end of the model the indices are 5, 7.
You normally do not call this method. This method is public to allow view classes to call it.
- Parameters:
-
firstRow
- the first row -
endRow
- the last row - Throws:
-
IndexOutOfBoundsException
- if either argument is invalid, orfirstRow
>endRow
rowsDeleted
public abstract void rowsDeleted(int firstRow, int endRow)
Invoked when rows have been deleted from the underlying model in the specified range (inclusive).
The arguments give the indices of the effected range and are in terms of the model before the change. For example, if you have a 5-row model and delete 3 items from the end of the model the indices are 2, 4.
You normally do not call this method. This method is public to allow view classes to call it.
- Parameters:
-
firstRow
- the first row -
endRow
- the last row - Throws:
-
IndexOutOfBoundsException
- if either argument is outside the range of the model before the change, orfirstRow
>endRow
rowsUpdated
public abstract void rowsUpdated(int firstRow, int endRow)
Invoked when rows have been changed in the underlying model between the specified range (inclusive).
You normally do not call this method. This method is public to allow view classes to call it.
- Parameters:
-
firstRow
- the first row, in terms of the underlying model -
endRow
- the last row, in terms of the underlying model - Throws:
-
IndexOutOfBoundsException
- if either argument is outside the range of the underlying model, orfirstRow
>endRow
rowsUpdated
public abstract void rowsUpdated(int firstRow, int endRow, int column)
Invoked when the column in the rows have been updated in the underlying model between the specified range.
You normally do not call this method. This method is public to allow view classes to call it.
- Parameters:
-
firstRow
- the first row, in terms of the underlying model -
endRow
- the last row, in terms of the underlying model -
column
- the column that has changed, in terms of the underlying model - Throws:
-
IndexOutOfBoundsException
- if either argument is outside the range of the underlying model after the change,firstRow
>endRow
, orcolumn
is outside the range of the underlying model
addRowSorterListener
public void addRowSorterListener(RowSorterListener l)
Adds a RowSorterListener
to receive notification about this RowSorter
. If the same listener is added more than once it will receive multiple notifications. If l
is null
nothing is done.
- Parameters:
-
l
- theRowSorterListener
removeRowSorterListener
public void removeRowSorterListener(RowSorterListener l)
Removes a RowSorterListener
. If l
is null
nothing is done.
- Parameters:
-
l
- theRowSorterListener
fireSortOrderChanged
protected void fireSortOrderChanged()
Notifies listener that the sort order has changed.
fireRowSorterChanged
protected void fireRowSorterChanged(int[] lastRowIndexToModel)
Notifies listener that the mapping has changed.
- Parameters:
-
lastRowIndexToModel
- the mapping from model indices to view indices prior to the sort, may benull