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annotate graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/TriState.java @ 21556:48c1ebd24120

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renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Wed, 27 May 2015 00:36:16 +0200
parents graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/TriState.java@758c2bd9bc0d
children
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1 /*
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2 * Copyright (c) 2012, 2015, 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
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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.jvmci.meta;
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24
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25 /**
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26 * Represents a logic value that can be either {@link #TRUE}, {@link #FALSE}, or {@link #UNKNOWN}.
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27 */
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28 public enum TriState {
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29 TRUE,
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30 FALSE,
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31 UNKNOWN;
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32
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33 public static TriState get(boolean value) {
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34 return value ? TRUE : FALSE;
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35 }
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36
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37 /**
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38 * This is optimistic about {@link #UNKNOWN} (it prefers known values over {@link #UNKNOWN}) and
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39 * pesimistic about known (it perfers {@link #TRUE} over {@link #FALSE}).
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40 */
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41 public static TriState merge(TriState a, TriState b) {
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42 if (a == TRUE || b == TRUE) {
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43 return TRUE;
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44 }
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45 if (a == FALSE || b == FALSE) {
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46 return FALSE;
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47 }
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48 assert a == UNKNOWN && b == UNKNOWN;
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49 return UNKNOWN;
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50 }
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51
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52 public boolean isTrue() {
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53 return this == TRUE;
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54 }
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55
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56 public boolean isFalse() {
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57 return this == FALSE;
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58 }
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59
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60 public boolean isUnknown() {
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61 return this == UNKNOWN;
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62 }
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63
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64 public boolean isKnown() {
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65 return this != UNKNOWN;
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66 }
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67
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68 public boolean toBoolean() {
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69 if (isTrue()) {
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70 return true;
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71 } else if (isFalse()) {
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72 return false;
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73 } else {
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74 throw new IllegalStateException("Cannot convert to boolean, TriState is in an unknown state");
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75 }
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76 }
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77 }