01: package it.unimi.dsi.fastutil;
02:
03: /*
04: * fastutil: Fast & compact type-specific collections for Java
05: *
06: * Copyright (C) 2002-2008 Sebastiano Vigna
07: *
08: * This library is free software; you can redistribute it and/or
09: * 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: /** An abstract class providing basic methods for implementing the {@link Stack} interface.
25: *
26: * <P>This class just defines {@link Stack#top()} as {@link Stack#peek(int) peek(0)}, and
27: * {@link Stack#peek(int)} as throwing an {@link UnsupportedOperationException}.
28: *
29: * Subclasses of this class may choose to implement just {@link Stack#push(Object)},
30: * {@link Stack#pop()} and {@link Stack#isEmpty()}, or (but this is not
31: * required) go farther and implement {@link Stack#top()}, or even {@link
32: * Stack#peek(int)}.
33: */
34:
35: public abstract class AbstractStack<K> implements Stack<K> {
36:
37: public K top() {
38: return peek(0);
39: }
40:
41: public K peek(int i) {
42: throw new UnsupportedOperationException();
43: }
44:
45: }
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