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Java > Open Source Codes > it > unimi > dsi > fastutil > AbstractStack


1 package it.unimi.dsi.fastutil;
2
3 /*
4  * fastutil: Fast & compact type-specific collections for Java
5  *
6  * Copyright (C) 2002, 2003, 2004, 2005, 2006 Sebastiano Vigna
7  *
8  * This library is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * This library is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with this library; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21  *
22  */
23
24
25 /** An abstract class providing basic methods for implementing the {@link Stack} interface.
26  *
27  * <P>This class just defines {@link Stack#top()} as {@link Stack#peek(int) peek(0)}, and
28  * {@link Stack#peek(int)} as throwing an {@link UnsupportedOperationException}.
29  *
30  * Subclasses of this class may choose to implement just {@link Stack#push(Object)},
31  * {@link Stack#pop()} and {@link Stack#isEmpty()}, or (but this is not
32  * required) go farther and implement {@link Stack#top()}, or even {@link
33  * Stack#peek(int)}.
34  */
35
36 public abstract class AbstractStack<K> implements Stack<K> {
37
38     public K top() {
39         return peek( 0 );
40     }
41
42     public K peek( int i ) {
43         throw new UnsupportedOperationException JavaDoc();
44     }
45
46 }
47
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