| /* |
| * Copyright 2000 Sun Microsystems, Inc. All Rights Reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.utilities.memo; |
| |
| /** A memoized double. Override {@link #computeValue} in subclasses; |
| call {@link #getValue} in using code. */ |
| |
| public abstract class MemoizedDouble { |
| private boolean computed; |
| private double value; |
| |
| /** Should compute the value of this memoized object. This will only |
| be called once, upon the first call to {@link #getValue}. */ |
| protected abstract double computeValue(); |
| |
| /** Public accessor for the memoized value. */ |
| public double getValue() { |
| if (!computed) { |
| value = computeValue(); |
| computed = true; |
| } |
| return value; |
| } |
| } |
