Mercurial > hg > truffle
view graal/com.oracle.jvmci.options/src/com/oracle/jvmci/options/DerivedOptionValue.java @ 21758:532f9b06f54e
Another fix for the implicit null check phase.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Fri, 05 Jun 2015 23:53:43 +0200 |
parents | b1530a6cce8c |
children |
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/* * Copyright (c) 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.jvmci.options; import java.io.*; import java.util.function.*; import com.oracle.jvmci.options.OptionValue.OverrideScope; /** * A cached value that needs to be recomputed when an option changes. */ public class DerivedOptionValue<T> { public interface OptionSupplier<T> extends Supplier<T>, Serializable { } private final T initialValue; private final OptionSupplier<T> supplier; public DerivedOptionValue(OptionSupplier<T> supplier) { this.supplier = supplier; assert OptionValue.getOverrideScope() == null : "derived option value should be initialized outside any override scope"; this.initialValue = createValue(); } public T getValue() { OverrideScope overrideScope = OptionValue.getOverrideScope(); if (overrideScope != null) { return overrideScope.getDerived(this); } else { return initialValue; } } T createValue() { return supplier.get(); } }