Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/utilities/memo/MemoizedLong.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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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 long. Override {@link #computeValue} in subclasses; | |
28 call {@link #getValue} in using code. */ | |
29 | |
30 public abstract class MemoizedLong { | |
31 private boolean computed; | |
32 private long 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 long computeValue(); | |
37 | |
38 /** Public accessor for the memoized value. */ | |
39 public long getValue() { | |
40 if (!computed) { | |
41 value = computeValue(); | |
42 computed = true; | |
43 } | |
44 return value; | |
45 } | |
46 } |