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/*
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* Copyright (c) 1997, 2001, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javax.swing;
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import javax.swing.event.ListDataListener;
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/**
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* This interface defines the methods components like JList use
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* to get the value of each cell in a list and the length of the list.
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* Logically the model is a vector, indices vary from 0 to
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* ListDataModel.getSize() - 1. Any change to the contents or
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* length of the data model must be reported to all of the
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* ListDataListeners.
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*
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* @param <E> the type of the elements of this model
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*
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* @author Hans Muller
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* @see JList
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*/
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public interface ListModel<E>
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{
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/**
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* Returns the length of the list.
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* @return the length of the list
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*/
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int getSize();
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/**
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* Returns the value at the specified index.
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* @param index the requested index
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* @return the value at <code>index</code>
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*/
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E getElementAt(int index);
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/**
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* Adds a listener to the list that's notified each time a change
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* to the data model occurs.
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* @param l the <code>ListDataListener</code> to be added
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*/
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void addListDataListener(ListDataListener l);
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/**
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* Removes a listener from the list that's notified each time a
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* change to the data model occurs.
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* @param l the <code>ListDataListener</code> to be removed
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*/
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void removeListDataListener(ListDataListener l);
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}
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