The AbstractTableModel.java Java example source code
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
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*
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package javax.swing.table;
import javax.swing.*;
import javax.swing.event.*;
import java.io.Serializable;
import java.util.EventListener;
/**
* This abstract class provides default implementations for most of
* the methods in the <code>TableModel interface. It takes care of
* the management of listeners and provides some conveniences for generating
* <code>TableModelEvents and dispatching them to the listeners.
* To create a concrete <code>TableModel as a subclass of
* <code>AbstractTableModel you need only provide implementations
* for the following three methods:
*
* <pre>
* public int getRowCount();
* public int getColumnCount();
* public Object getValueAt(int row, int column);
* </pre>
* <p>
* <strong>Warning:
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the <code>java.beans package.
* Please see {@link java.beans.XMLEncoder}.
*
* @author Alan Chung
* @author Philip Milne
*/
public abstract class AbstractTableModel implements TableModel, Serializable
{
//
// Instance Variables
//
/** List of listeners */
protected EventListenerList listenerList = new EventListenerList();
//
// Default Implementation of the Interface
//
/**
* Returns a default name for the column using spreadsheet conventions:
* A, B, C, ... Z, AA, AB, etc. If <code>column cannot be found,
* returns an empty string.
*
* @param column the column being queried
* @return a string containing the default name of <code>column
*/
public String getColumnName(int column) {
String result = "";
for (; column >= 0; column = column / 26 - 1) {
result = (char)((char)(column%26)+'A') + result;
}
return result;
}
/**
* Returns a column given its name.
* Implementation is naive so this should be overridden if
* this method is to be called often. This method is not
* in the <code>TableModel interface and is not used by the
* <code>JTable.
*
* @param columnName string containing name of column to be located
* @return the column with <code>columnName, or -1 if not found
*/
public int findColumn(String columnName) {
for (int i = 0; i < getColumnCount(); i++) {
if (columnName.equals(getColumnName(i))) {
return i;
}
}
return -1;
}
/**
* Returns <code>Object.class regardless of columnIndex.
*
* @param columnIndex the column being queried
* @return the Object.class
*/
public Class<?> getColumnClass(int columnIndex) {
return Object.class;
}
/**
* Returns false. This is the default implementation for all cells.
*
* @param rowIndex the row being queried
* @param columnIndex the column being queried
* @return false
*/
public boolean isCellEditable(int rowIndex, int columnIndex) {
return false;
}
/**
* This empty implementation is provided so users don't have to implement
* this method if their data model is not editable.
*
* @param aValue value to assign to cell
* @param rowIndex row of cell
* @param columnIndex column of cell
*/
public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
}
//
// Managing Listeners
//
/**
* Adds a listener to the list that's notified each time a change
* to the data model occurs.
*
* @param l the TableModelListener
*/
public void addTableModelListener(TableModelListener l) {
listenerList.add(TableModelListener.class, l);
}
/**
* Removes a listener from the list that's notified each time a
* change to the data model occurs.
*
* @param l the TableModelListener
*/
public void removeTableModelListener(TableModelListener l) {
listenerList.remove(TableModelListener.class, l);
}
/**
* Returns an array of all the table model listeners
* registered on this model.
*
* @return all of this model's <code>TableModelListeners
* or an empty
* array if no table model listeners are currently registered
*
* @see #addTableModelListener
* @see #removeTableModelListener
*
* @since 1.4
*/
public TableModelListener[] getTableModelListeners() {
return listenerList.getListeners(TableModelListener.class);
}
//
// Fire methods
//
/**
* Notifies all listeners that all cell values in the table's
* rows may have changed. The number of rows may also have changed
* and the <code>JTable should redraw the
* table from scratch. The structure of the table (as in the order of the
* columns) is assumed to be the same.
*
* @see TableModelEvent
* @see EventListenerList
* @see javax.swing.JTable#tableChanged(TableModelEvent)
*/
public void fireTableDataChanged() {
fireTableChanged(new TableModelEvent(this));
}
/**
* Notifies all listeners that the table's structure has changed.
* The number of columns in the table, and the names and types of
* the new columns may be different from the previous state.
* If the <code>JTable receives this event and its
* <code>autoCreateColumnsFromModel
* flag is set it discards any table columns that it had and reallocates
* default columns in the order they appear in the model. This is the
* same as calling <code>setModel(TableModel) on the
* <code>JTable.
*
* @see TableModelEvent
* @see EventListenerList
*/
public void fireTableStructureChanged() {
fireTableChanged(new TableModelEvent(this, TableModelEvent.HEADER_ROW));
}
/**
* Notifies all listeners that rows in the range
* <code>[firstRow, lastRow], inclusive, have been inserted.
*
* @param firstRow the first row
* @param lastRow the last row
*
* @see TableModelEvent
* @see EventListenerList
*
*/
public void fireTableRowsInserted(int firstRow, int lastRow) {
fireTableChanged(new TableModelEvent(this, firstRow, lastRow,
TableModelEvent.ALL_COLUMNS, TableModelEvent.INSERT));
}
/**
* Notifies all listeners that rows in the range
* <code>[firstRow, lastRow], inclusive, have been updated.
*
* @param firstRow the first row
* @param lastRow the last row
*
* @see TableModelEvent
* @see EventListenerList
*/
public void fireTableRowsUpdated(int firstRow, int lastRow) {
fireTableChanged(new TableModelEvent(this, firstRow, lastRow,
TableModelEvent.ALL_COLUMNS, TableModelEvent.UPDATE));
}
/**
* Notifies all listeners that rows in the range
* <code>[firstRow, lastRow], inclusive, have been deleted.
*
* @param firstRow the first row
* @param lastRow the last row
*
* @see TableModelEvent
* @see EventListenerList
*/
public void fireTableRowsDeleted(int firstRow, int lastRow) {
fireTableChanged(new TableModelEvent(this, firstRow, lastRow,
TableModelEvent.ALL_COLUMNS, TableModelEvent.DELETE));
}
/**
* Notifies all listeners that the value of the cell at
* <code>[row, column] has been updated.
*
* @param row row of cell which has been updated
* @param column column of cell which has been updated
* @see TableModelEvent
* @see EventListenerList
*/
public void fireTableCellUpdated(int row, int column) {
fireTableChanged(new TableModelEvent(this, row, row, column));
}
/**
* Forwards the given notification event to all
* <code>TableModelListeners that registered
* themselves as listeners for this table model.
*
* @param e the event to be forwarded
*
* @see #addTableModelListener
* @see TableModelEvent
* @see EventListenerList
*/
public void fireTableChanged(TableModelEvent e) {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==TableModelListener.class) {
((TableModelListener)listeners[i+1]).tableChanged(e);
}
}
}
/**
* Returns an array of all the objects currently registered
* as <code>FooListeners
* upon this <code>AbstractTableModel.
* <code>FooListeners are registered using the
* <code>addFooListener method.
*
* <p>
*
* You can specify the <code>listenerType argument
* with a class literal,
* such as
* <code>FooListener.class.
* For example, you can query a
* model <code>m
* for its table model listeners with the following code:
*
* <pre>TableModelListener[] tmls = (TableModelListener[])(m.getListeners(TableModelListener.class));
*
* If no such listeners exist, this method returns an empty array.
*
* @param listenerType the type of listeners requested; this parameter
* should specify an interface that descends from
* <code>java.util.EventListener
* @return an array of all objects registered as
* <code>
FooListeners on this component,
* or an empty array if no such
* listeners have been added
* @exception ClassCastException if <code>listenerType
* doesn't specify a class or interface that implements
* <code>java.util.EventListener
*
* @see #getTableModelListeners
*
* @since 1.3
*/
public <T extends EventListener> T[] getListeners(Class
listenerType) {
return listenerList.getListeners(listenerType);
}
} // End of class AbstractTableModel
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