Showing the changes to java/pkg/sun/misc/DoubleConsts.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,117 @@ | |||
| 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 | } | ||