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annotate graal/com.oracle.graal.options/src/com/oracle/graal/options/DerivedOptionValue.java @ 18935:07f2a49f0bfb

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Various adjustments to simplify future merges
author Paul Woegerer <paul.woegerer@oracle.com>
date Fri, 23 Jan 2015 15:51:35 +0100
parents e728b9d4905c
children 75cf0899be47
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
e728b9d4905c Recompute phase suites when options are changed.
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.options;
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24
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25 import java.util.function.*;
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26
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27 import com.oracle.graal.options.OptionValue.OverrideScope;
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28
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29 /**
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30 * A cached value that needs to be recomputed when an option changes.
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31 */
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32 public class DerivedOptionValue<T> {
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33
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34 private final T initialValue;
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35 private final Supplier<T> supplier;
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36
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37 public DerivedOptionValue(Supplier<T> supplier) {
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38 this.supplier = supplier;
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39 assert OptionValue.getOverrideScope() == null : "derived option value should be initialized outside any override scope";
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40 this.initialValue = createValue();
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41 }
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42
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43 public T getValue() {
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44 OverrideScope overrideScope = OptionValue.getOverrideScope();
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45 if (overrideScope != null) {
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46 return overrideScope.getDerived(this);
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47 } else {
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48 return initialValue;
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49 }
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50 }
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51
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52 T createValue() {
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53 return supplier.get();
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54 }
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55 }