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AbstractTableModel.java
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1998-06-30
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/*
* @(#)AbstractTableModel.java 1.18 98/02/02
*
* Copyright (c) 1997 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the confidential and proprietary information of Sun
* Microsystems, Inc. ("Confidential Information"). You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Sun.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
* SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
* THIS SOFTWARE OR ITS DERIVATIVES.
*
*/
package com.sun.java.swing.table;
import com.sun.java.swing.*;
import com.sun.java.swing.event.*;
import java.io.Serializable;
/**
* This abstract class provides default implementations for most of
* the methods in the <B>TableModel</B> interface. It takes care of
* the management of listners and provides some conveniences for generating
* TableModelEvents and dispatching them to the listeners.
* To create a concrete TableModel as a sublcass of
* 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>
* 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 Swing1.0 applications. It will
* not be possible to load serialized Swing1.0 objects with future releases
* of Swing. The JDK1.2 release of Swing will be the compatibility
* baseline for the serialized form of Swing objects.
*
* @version 1.18 02/02/98
* @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
//
/**
* Return a default name for the column using spreadsheet conventions:
* A, B, C, ... Z, AA, AB, etc.
*/
public String getColumnName(int column) {
String result = "";
for (; column >= 0; column = column / 26 - 1) {
result = (char)((char)(column%26)+'A') + result;
}
return result;
}
/**
* Convenience method for locating columns by name.
* Implementation is naive so this should be overridden if
* this method is to be called often. This method is not
* in the TableModel interface and is not used by the JTable.
*/
public int findColumn(String columnName) {
for (int i = 0; i < getColumnCount(); i++) {
if (columnName.equals(getColumnName(i))) {
return i;
}
}
return -1;
}
/**
* Returns Object.class by default
*/
public Class getColumnClass(int columnIndex) {
return Object.class;
}
/**
* This default implementation returns false for all cells
*/
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.
*/
public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
}
//
// Managing Listeners
//
public void addTableModelListener(TableModelListener l) {
listenerList.add(TableModelListener.class, l);
}
public void removeTableModelListener(TableModelListener l) {
listenerList.remove(TableModelListener.class, l);
}
//
// Fire methods
//
/**
* Notify all listeners that all cell values in the table's rows may have changed.
* The number of rows may also have changed and the JTable should redraw the
* table from scratch. The structure of the table, ie. the order of the
* columns is assumed to be the same.
* @see TableModelEvent
* @see EventListenerList
*/
protected void fireTableDataChanged() {
fireTableChanged(new TableModelEvent(this));
}
/**
* Notify 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 JTable recieves this event and its <I>autoCreateColumnsFromModel</I>
* flag is set it discards any TableColumns that it had and reallocates
* default ones in the order they appear in the model. This is the
* same as calling <code>setModel(TableModel)</code> on the JTable.
* @see TableModelEvent
* @see EventListenerList
*/
protected void fireTableStructureChanged() {
fireTableChanged(new TableModelEvent(this, TableModelEvent.HEADER_ROW));
}
/**
* Notify all listeners that rows in the (inclusive) range
* [<I>firstRow</I>, <I>lastRow</I>] have been inserted.
* @see TableModelEvent
* @see EventListenerList
*/
protected void fireTableRowsInserted(int firstRow, int lastRow) {
fireTableChanged(new TableModelEvent(this, firstRow, lastRow,
TableModelEvent.ALL_COLUMNS, TableModelEvent.INSERT));
}
/**
* Notify all listeners that rows in the (inclusive) range
* [<I>firstRow</I>, <I>lastRow</I>] have been updated.
* @see TableModelEvent
* @see EventListenerList
*/
protected void fireTableRowsUpdated(int firstRow, int lastRow) {
fireTableChanged(new TableModelEvent(this, firstRow, lastRow,
TableModelEvent.ALL_COLUMNS, TableModelEvent.UPDATE));
}
/**
* Notify all listeners that rows in the (inclusive) range
* [<I>firstRow</I>, <I>lastRow</I>] have been deleted.
* @see TableModelEvent
* @see EventListenerList
*/
protected void fireTableRowsDeleted(int firstRow, int lastRow) {
fireTableChanged(new TableModelEvent(this, firstRow, lastRow,
TableModelEvent.ALL_COLUMNS, TableModelEvent.DELETE));
}
/**
* Notify all listeners that the value of the cell at (row, column)
* has been updated.
* @see TableModelEvent
* @see EventListenerList
*/
protected void fireTableCellUpdated(int row, int column) {
fireTableChanged(new TableModelEvent(this, row, row, column));
}
/**
* Forward the given notification event to all TableModelListeners that registered
* themselves as listeners for this table model.
* @see #addTableModelListener
* @see TableModelEvent
* @see EventListenerList
*/
protected 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);
}
}
}
} // End of class AbstractTableModel