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comparison graal/com.oracle.jvmci.options/src/com/oracle/jvmci/options/DerivedOptionValue.java @ 21554:b1530a6cce8c

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renamed com.oracle.graal.[debug|options|hotspotvmconfig]* modules to com.oracle.jvmci.[debug|options|hotspotvmconfig]* modules (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Tue, 26 May 2015 23:21:15 +0200
parents graal/com.oracle.graal.options/src/com/oracle/graal/options/DerivedOptionValue.java@75cf0899be47
children
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21553:0910a9497b02 21554:b1530a6cce8c
1 /*
2 * Copyright (c) 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.oracle.jvmci.options;
24
25 import java.io.*;
26 import java.util.function.*;
27
28 import com.oracle.jvmci.options.OptionValue.OverrideScope;
29
30 /**
31 * A cached value that needs to be recomputed when an option changes.
32 */
33 public class DerivedOptionValue<T> {
34
35 public interface OptionSupplier<T> extends Supplier<T>, Serializable {
36 }
37
38 private final T initialValue;
39 private final OptionSupplier<T> supplier;
40
41 public DerivedOptionValue(OptionSupplier<T> supplier) {
42 this.supplier = supplier;
43 assert OptionValue.getOverrideScope() == null : "derived option value should be initialized outside any override scope";
44 this.initialValue = createValue();
45 }
46
47 public T getValue() {
48 OverrideScope overrideScope = OptionValue.getOverrideScope();
49 if (overrideScope != null) {
50 return overrideScope.getDerived(this);
51 } else {
52 return initialValue;
53 }
54 }
55
56 T createValue() {
57 return supplier.get();
58 }
59 }