/*
* Copyright (c) 1997, 2001, Oracle and/or its affiliates. All rights reserved.
* 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
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* 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).
*
* You should have received a copy of the GNU General Public License version
* 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;
import javax.swing.event.ListDataListener;
/**
* This interface defines the methods components like JList use
* to get the value of each cell in a list and the length of the list.
* Logically the model is a vector, indices vary from 0 to
* ListDataModel.getSize() - 1. Any change to the contents or
* length of the data model must be reported to all of the
* ListDataListeners.
*
* @author Hans Muller
* @see JList
*/
public interface ListModel
{
/**
* Returns the length of the list.
* @return the length of the list
*/
int getSize();
/**
* Returns the value at the specified index.
* @param index the requested index
* @return the value at <code>index</code>
*/
Object getElementAt(int index);
/**
* Adds a listener to the list that's notified each time a change
* to the data model occurs.
* @param l the <code>ListDataListener</code> to be added
*/
void addListDataListener(ListDataListener l);
/**
* Removes a listener from the list that's notified each time a
* change to the data model occurs.
* @param l the <code>ListDataListener</code> to be removed
*/
void removeListDataListener(ListDataListener l);
}