1 /* 2 * Copyright (c) 1997, 2001, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package javax.swing; 27 28 import javax.swing.event.ListDataListener; 29 30 /** 31 * This interface defines the methods components like JList use 32 * to get the value of each cell in a list and the length of the list. 33 * Logically the model is a vector, indices vary from 0 to 34 * ListDataModel.getSize() - 1. Any change to the contents or 35 * length of the data model must be reported to all of the 36 * ListDataListeners. 37 * 38 * @param <E> the type of the elements of this model 39 * 40 * @author Hans Muller 41 * @see JList 42 */ 43 public interface ListModel<E> 44 { 45 /** 46 * Returns the length of the list. 47 * @return the length of the list 48 */ 49 int getSize(); 50 51 /** 52 * Returns the value at the specified index. 53 * @param index the requested index 54 * @return the value at <code>index</code> 55 */ 56 E getElementAt(int index); 57 58 /** 59 * Adds a listener to the list that's notified each time a change 60 * to the data model occurs. 61 * @param l the <code>ListDataListener</code> to be added 62 */ 63 void addListDataListener(ListDataListener l); 64 65 /** 66 * Removes a listener from the list that's notified each time a 67 * change to the data model occurs. 68 * @param l the <code>ListDataListener</code> to be removed 69 */ 70 void removeListDataListener(ListDataListener l); 71 }