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| 1 | +/* | |
| 2 | + * Copyright (c) 2003, 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. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.misc; | |
| 27 | + | |
| 28 | +/** | |
| 29 | + * This class contains additional constants documenting limits of the | |
| 30 | + * <code>double</code> type. | |
| 31 | + * | |
| 32 | + * @author Joseph D. Darcy | |
| 33 | + */ | |
| 34 | + | |
| 35 | +public class DoubleConsts { | |
| 36 | + /** | |
| 37 | + * Don't let anyone instantiate this class. | |
| 38 | + */ | |
| 39 | + private DoubleConsts() {} | |
| 40 | + | |
| 41 | + public static final double POSITIVE_INFINITY = java.lang.Double.POSITIVE_INFINITY; | |
| 42 | + public static final double NEGATIVE_INFINITY = java.lang.Double.NEGATIVE_INFINITY; | |
| 43 | + public static final double NaN = java.lang.Double.NaN; | |
| 44 | + public static final double MAX_VALUE = java.lang.Double.MAX_VALUE; | |
| 45 | + public static final double MIN_VALUE = java.lang.Double.MIN_VALUE; | |
| 46 | + | |
| 47 | + /** | |
| 48 | + * A constant holding the smallest positive normal value of type | |
| 49 | + * <code>double</code>, 2<sup>-1022</sup>. It is equal to the | |
| 50 | + * value returned by | |
| 51 | + * <code>Double.longBitsToDouble(0x0010000000000000L)</code>. | |
| 52 | + * | |
| 53 | + * @since 1.5 | |
| 54 | + */ | |
| 55 | + public static final double MIN_NORMAL = 2.2250738585072014E-308; | |
| 56 | + | |
| 57 | + | |
| 58 | + /** | |
| 59 | + * The number of logical bits in the significand of a | |
| 60 | + * <code>double</code> number, including the implicit bit. | |
| 61 | + */ | |
| 62 | + public static final int SIGNIFICAND_WIDTH = 53; | |
| 63 | + | |
| 64 | + /** | |
| 65 | + * Maximum exponent a finite <code>double</code> number may have. | |
| 66 | + * It is equal to the value returned by | |
| 67 | + * <code>Math.ilogb(Double.MAX_VALUE)</code>. | |
| 68 | + */ | |
| 69 | + public static final int MAX_EXPONENT = 1023; | |
| 70 | + | |
| 71 | + /** | |
| 72 | + * Minimum exponent a normalized <code>double</code> number may | |
| 73 | + * have. It is equal to the value returned by | |
| 74 | + * <code>Math.ilogb(Double.MIN_NORMAL)</code>. | |
| 75 | + */ | |
| 76 | + public static final int MIN_EXPONENT = -1022; | |
| 77 | + | |
| 78 | + /** | |
| 79 | + * The exponent the smallest positive <code>double</code> | |
| 80 | + * subnormal value would have if it could be normalized. It is | |
| 81 | + * equal to the value returned by | |
| 82 | + * <code>FpUtils.ilogb(Double.MIN_VALUE)</code>. | |
| 83 | + */ | |
| 84 | + public static final int MIN_SUB_EXPONENT = MIN_EXPONENT - | |
| 85 | + (SIGNIFICAND_WIDTH - 1); | |
| 86 | + | |
| 87 | + /** | |
| 88 | + * Bias used in representing a <code>double</code> exponent. | |
| 89 | + */ | |
| 90 | + public static final int EXP_BIAS = 1023; | |
| 91 | + | |
| 92 | + /** | |
| 93 | + * Bit mask to isolate the sign bit of a <code>double</code>. | |
| 94 | + */ | |
| 95 | + public static final long SIGN_BIT_MASK = 0x8000000000000000L; | |
| 96 | + | |
| 97 | + /** | |
| 98 | + * Bit mask to isolate the exponent field of a | |
| 99 | + * <code>double</code>. | |
| 100 | + */ | |
| 101 | + public static final long EXP_BIT_MASK = 0x7FF0000000000000L; | |
| 102 | + | |
| 103 | + /** | |
| 104 | + * Bit mask to isolate the significand field of a | |
| 105 | + * <code>double</code>. | |
| 106 | + */ | |
| 107 | + public static final long SIGNIF_BIT_MASK = 0x000FFFFFFFFFFFFFL; | |
| 108 | + | |
| 109 | + static { | |
| 110 | + // verify bit masks cover all bit positions and that the bit | |
| 111 | + // masks are non-overlapping | |
| 112 | + assert(((SIGN_BIT_MASK | EXP_BIT_MASK | SIGNIF_BIT_MASK) == ~0L) && | |
| 113 | + (((SIGN_BIT_MASK & EXP_BIT_MASK) == 0L) && | |
| 114 | + ((SIGN_BIT_MASK & SIGNIF_BIT_MASK) == 0L) && | |
| 115 | + ((EXP_BIT_MASK & SIGNIF_BIT_MASK) == 0L))); | |
| 116 | + } | |
| 117 | +} | |