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comparison agent/src/share/classes/sun/jvm/hotspot/utilities/memo/MemoizedInt.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2000 Sun Microsystems, Inc. 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.utilities.memo;
26
27 /** A memoized int. Override {@link #computeValue} in subclasses; call
28 {@link #getValue} in using code. */
29
30 public abstract class MemoizedInt {
31 private boolean computed;
32 private int value;
33
34 /** Should compute the value of this memoized object. This will only
35 be called once, upon the first call to {@link #getValue}. */
36 protected abstract int computeValue();
37
38 /** Public accessor for the memoized value. */
39 public int getValue() {
40 if (!computed) {
41 value = computeValue();
42 computed = true;
43 }
44 return value;
45 }
46 }