public abstract class javax.swing
DefaultRowSorter<M, I>


Show All Login
Java SE 6
  
Extends: RowSorter
Inner classes: DefaultRowSorter.ModelWrapper
Extended by: TableRowSorter
Details
An implementation of RowSorter that provides sorting and filtering around a grid-based data model. 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.

Sorting is done based on the current SortKeys, in order. If two objects are equal (the Comparator for the column returns 0) the next SortKey is used. If no SortKeys remain or the order is UNSORTED, then the order of the rows in the model is used.

Sorting of each column is done by way of a Comparator that you can specify using the setComparator method. If a Comparator has not been specified, the Comparator returned by Collator.getInstance() is used on the results of calling toString on the underlying objects. The Comparator is never passed null. A null value is treated as occuring before a non-null value, and two null values are considered equal.

If you specify a Comparator that casts its argument to a type other than that provided by the model, a ClassCastException will be thrown when the data is sorted.

In addition to sorting, DefaultRowSorter provides the ability to filter rows. Filtering is done by way of a RowFilter that is specified using the setRowFilter method. If no filter has been specified all rows are included.

By default, rows are in unsorted order (the same as the model) and every column is sortable. The default Comparators are documented in the subclasses (for example, TableRowSorter).

If the underlying model structure changes (the modelStructureChanged method is invoked) the following are reset to their default values: Comparators by column, current sort order, and whether each column is sortable. To find the default Comparators, see the concrete implementation (for example, TableRowSorter). The default sort order is unsorted (the same as the model), and columns are sortable by default.

If the underlying model structure changes (the modelStructureChanged method is invoked) the following are reset to their default values: Comparators by column, current sort order and whether a column is sortable.

DefaultRowSorter is an abstract class. Concrete subclasses must provide access to the underlying data by invoking setModelWrapper. The setModelWrapper method must be invoked soon after the constructor is called, ideally from within the subclass's constructor. Undefined behavior will result if you use a DefaultRowSorter without specifying a ModelWrapper.

DefaultRowSorter has two formal type parameters. The first type parameter corresponds to the class of the model, for example DefaultTableModel. The second type parameter corresponds to the class of the identifier passed to the RowFilter. Refer to TableRowSorter and RowFilter for more details on the type parameters.
Mthe type of the model
Ithe type of the identifier passed to the RowFilter
version1.20 06/23/06
since1.6
See also javax.swing.table.TableRowSorter, javax.swing.table.DefaultTableModel, java.text.Collator


Constructors
public DefaultRowSorter()
Creates an empty DefaultRowSorter.

Methods
public 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.

public int convertRowIndexToModel(int index) Details
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.
ThrowsIndexOutOfBoundsException: if index is outside the range of the view
public int convertRowIndexToView(int index) Details
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.
ThrowsIndexOutOfBoundsException: if index is outside the range of the model
public 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.

public void rowsDeleted(int firstRow, int endRow) Details
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.
ThrowsIndexOutOfBoundsException: if either argument is outside the range of the model before the change, or firstRow > endRow

public void rowsInserted(int firstRow, int endRow) Details
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.
ThrowsIndexOutOfBoundsException: if either argument is invalid, or firstRow > endRow

public void rowsUpdated(int firstRow, int endRow) Details
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.
ThrowsIndexOutOfBoundsException: if either argument is outside the range of the underlying model, or firstRow > endRow

public void rowsUpdated(int firstRow, int endRow, int column) Details
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.
ThrowsIndexOutOfBoundsException: if either argument is outside the range of the underlying model after the change, firstRow > endRow, or column is outside the range of the underlying model

public void sort() Details
Sorts and filters the rows in the view based on the sort keys of the columns currently being sorted and the filter, if any, associated with this sorter. An empty sortKeys list indicates that the view should unsorted, the same as the model.
See also setRowFilter, setSortKeys
public void toggleSortOrder(int column) Details
Reverses 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.
columnindex of the column to make the primary sorted column, in terms of the underlying model
ThrowsIndexOutOfBoundsException: if column is outside the range of the underlying model
See also setSortable(int,boolean), setMaxSortKeys(int)
protected boolean useToString(int column) Details
Returns whether or not to convert the value to a string before doing comparisons when sorting. If true ModelWrapper.getStringValueAt will be used, otherwise ModelWrapper.getValueAt will be used. It is up to subclasses, such as TableRowSorter, to honor this value in their ModelWrapper implementation.
columnthe index of the column to test, in terms of the underlying model
ThrowsIndexOutOfBoundsException: if column is not valid

Properties
public void setComparator(int column, Comparator comparator) Details
Sets the Comparator to use when sorting the specified column. This does not trigger a sort. If you want to sort after setting the comparator you need to explicitly invoke sort.
columnthe index of the column the Comparator is to be used for, in terms of the underlying model
comparatorthe Comparator to use
ThrowsIndexOutOfBoundsException: if column is outside the range of the underlying model
public Comparator getComparator(int column) Details
Returns the Comparator for the specified column. This will return null if a Comparator has not been specified for the column.
columnthe column to fetch the Comparator for, in terms of the underlying model
returnthe Comparator for the specified column
ThrowsIndexOutOfBoundsException: if column is outside the range of the underlying model
public void setMaxSortKeys(int max) Details
Sets the maximum number of sort keys. The number of sort keys determines how equal values are resolved when sorting. For example, assume a table row sorter is created and setMaxSortKeys(2) is invoked on it. The user clicks the header for column 1, causing the table rows to be sorted based on the items in column 1. Next, the user clicks the header for column 2, causing the table to be sorted based on the items in column 2; if any items in column 2 are equal, then those particular rows are ordered based on the items in column 1. In this case, we say that the rows are primarily sorted on column 2, and secondarily on column 1. If the user then clicks the header for column 3, then the items are primarily sorted on column 3 and secondarily sorted on column 2. Because the maximum number of sort keys has been set to 2 with setMaxSortKeys, column 1 no longer has an effect on the order.

The maximum number of sort keys is enforced by toggleSortOrder. You can specify more sort keys by invoking setSortKeys directly and they will all be honored. However if toggleSortOrder is subsequently invoked the maximum number of sort keys will be enforced. The default value is 3.
maxthe maximum number of sort keys
ThrowsIllegalArgumentException: if max < 1

public int getMaxSortKeys() Details
Returns the maximum number of sort keys.
returnthe maximum number of sort keys
final public Object getModel() Details
Returns the underlying model.
returnthe underlying model
public int getModelRowCount()
Returns the number of rows in the underlying model.
final protected void setModelWrapper(DefaultRowSorter.ModelWrapper modelWrapper) Details
Sets the model wrapper providing the data that is being sorted and filtered.
modelWrapperthe model wrapper responsible for providing the data that gets sorted and filtered
ThrowsIllegalArgumentException: if modelWrapper is null
final protected DefaultRowSorter.ModelWrapper getModelWrapper() Details
Returns the model wrapper providing the data that is being sorted and filtered.
returnthe model wrapper responsible for providing the data that gets sorted and filtered
public void setRowFilter(RowFilter filter) Details
Sets the filter that determines which rows, if any, should be hidden from the view. The filter is applied before sorting. A value of null indicates all values from the model should be included.

RowFilter's include method is passed an Entry that wraps the underlying model. The number of columns in the Entry corresponds to the number of columns in the ModelWrapper. The identifier comes from the ModelWrapper as well.

This method triggers a sort.
filterthe filter used to determine what entries should be included

public RowFilter getRowFilter() Details
Returns the filter that determines which rows, if any, should be hidden from view.
returnthe filter
public void setSortable(int column, boolean sortable) Details
Sets whether or not the specified column is sortable. The specified value is only checked when toggleSortOrder is invoked. It is still possible to sort on a column that has been marked as unsortable by directly setting the sort keys. The default is true.
columnthe column to enable or disable sorting on, in terms of the underlying model
sortablewhether or not the specified column is sortable
ThrowsIndexOutOfBoundsException: if column is outside the range of the model
See also toggleSortOrder, setSortKeys
public boolean isSortable(int column) Details
Returns true if the specified column is sortable; otherwise, false.
columnthe column to check sorting for, in terms of the underlying model
returntrue if the column is sortable
ThrowsIndexOutOfBoundsException: if column is outside the range of the underlying model
public void setSortKeys(List sortKeys) Details
Sets the sort keys. This creates a copy of the supplied List; subsequent changes to the supplied List do not effect this DefaultRowSorter. If the sort keys have changed this triggers a sort.
sortKeysthe new SortKeys; null is a shorthand for specifying an empty list, indicating that the view should be unsorted
ThrowsIllegalArgumentException: if any of the values in sortKeys are null or have a column index outside the range of the model
public List getSortKeys() Details
Returns the current sort keys. This returns an unmodifiable non-null 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.
returnthe current sort order
public void setSortsOnUpdates(boolean sortsOnUpdates) Details
If true, specifies that a sort should happen when the underlying model is updated (rowsUpdated is invoked). For example, if this is true and the user edits an entry the location of that item in the view may change. The default is false.
sortsOnUpdateswhether or not to sort on update events
public boolean getSortsOnUpdates() Details
Returns true if a sort should happen when the underlying model is updated; otherwise, returns false.
returnwhether or not to sort when the model is updated
public 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.
About DocWeb · Bundles · Export · Export AllTop 10 · Statistics · Login
About Sun · Contact · Privacy · Terms of Use · Trademarks
Java SE 6
· Copyright © 1994-2009 Sun Microsystems, Inc.
All rights reserved. Use is subject to license terms