java.lang.Double Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2011-2014 Fernando Petrola
*
* This file is part of Dragome SDK.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the GNU Public License v3.0
* which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/gpl.html
******************************************************************************/
package java.lang;
import javascript.Utils;
import com.dragome.commons.javascript.ScriptHelper;
/*
* Copyright (c) 2006 j2js.com,
*
* All Rights Reserved. This work is distributed under the j2js Software License [1]
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.
*
* [1] http://www.j2js.com/license.txt
*/
public final class Double extends Number implements Comparable
{
public static final double POSITIVE_INFINITY= 1.0 / 0.0;
/**
* A constant holding the negative infinity of type
* double. It is equal to the value returned by
* Double.longBitsToDouble(0xfff0000000000000L).
*/
public static final double NEGATIVE_INFINITY= -1.0 / 0.0;
// 2^512, 2^-512
private static final double POWER_512= 1.3407807929942597E154;
private static final double POWER_MINUS_512= 7.458340731200207E-155;
// 2^256, 2^-256
private static final double POWER_256= 1.157920892373162E77;
private static final double POWER_MINUS_256= 8.636168555094445E-78;
// 2^128, 2^-128
private static final double POWER_128= 3.4028236692093846E38;
private static final double POWER_MINUS_128= 2.9387358770557188E-39;
// 2^64, 2^-64
private static final double POWER_64= 18446744073709551616.0;
private static final double POWER_MINUS_64= 5.421010862427522E-20;
// 2^52, 2^-52
private static final double POWER_52= 4503599627370496.0;
private static final double POWER_MINUS_52= 2.220446049250313E-16;
// 2^32, 2^-32
private static final double POWER_32= 4294967296.0;
private static final double POWER_MINUS_32= 2.3283064365386963E-10;
// 2^31
private static final double POWER_31= 2147483648.0;
// 2^20, 2^-20
private static final double POWER_20= 1048576.0;
private static final double POWER_MINUS_20= 9.5367431640625E-7;
// 2^16, 2^-16
private static final double POWER_16= 65536.0;
private static final double POWER_MINUS_16= 0.0000152587890625;
// 2^8, 2^-8
private static final double POWER_8= 256.0;
private static final double POWER_MINUS_8= 0.00390625;
// 2^4, 2^-4
private static final double POWER_4= 16.0;
private static final double POWER_MINUS_4= 0.0625;
// 2^2, 2^-2
private static final double POWER_2= 4.0;
private static final double POWER_MINUS_2= 0.25;
// 2^1, 2^-1
private static final double POWER_1= 2.0;
private static final double POWER_MINUS_1= 0.5;
// 2^-1022 (smallest double non-denorm)
private static final double POWER_MINUS_1022= 2.2250738585072014E-308;
private static final double[] powers= { POWER_512, POWER_256, POWER_128, POWER_64, POWER_32, POWER_16, POWER_8, POWER_4, POWER_2, POWER_1 };
private static final double[] invPowers= { POWER_MINUS_512, POWER_MINUS_256, POWER_MINUS_128, POWER_MINUS_64, POWER_MINUS_32, POWER_MINUS_16, POWER_MINUS_8, POWER_MINUS_4, POWER_MINUS_2, POWER_MINUS_1 };
public static final double NaN= 0d / 0d;
public static final Class TYPE= Class.getType("double");
private double value;
/**
* Constructs a newly allocated Double object that represents the primitive double argument.
*/
public Double(double d)
{
value= d;
}
/**
* Constructs a newly allocated Double object that represents the floating-point value of type double represented by the string. * @param s
*/
public Double(String s)
{
value= parseDouble(s);
}
/**
* Compares this object to the specified object.
*/
public boolean equals(Object obj)
{
if (obj == null || !(obj instanceof Double))
return false;
return ((Double) obj).value == value;
}
/**
* Compares the two specified double values.
*/
public int compareTo(Double o)
{
if (!(o instanceof Double))
throw new ClassCastException();
Double d= (Double) o;
if (isNaN() || d.isNaN())
{
if (isNaN() && d.isNaN())
return 0;
if (isNaN())
return 1;
return -1;
}
return Utils.cmp(value, d.doubleValue(), 0);
}
public double doubleValue()
{
return value;
}
public float floatValue()
{
return (float) value;
}
public int intValue()
{
return (int) value;
}
public long longValue()
{
return (long) value;
}
/**
* Returns true if this Double value is a Not-a-Number (NaN), false otherwise.
*/
public boolean isNaN()
{
return isNaN(value);
}
/**
* Returns true if the specified number is a Not-a-Number (NaN) value, false otherwise.
*/
public static boolean isNaN(double v)
{
ScriptHelper.put("value", v, null);
return ScriptHelper.evalBoolean("isNaN(value)", null);
}
/**
* Returns a new double initialized to the value represented by the specified String, as performed by the valueOf method of class Double.
*/
public static double parseDouble(String s) throws NumberFormatException
{
if (s == null)
throw new NullPointerException();
s= s.trim();
if (s.matches("(\\+|\\-)?NaN"))
return NaN;
if (!s.matches("(\\+|\\-)?\\d+(\\.\\d+)?"))
throw new NumberFormatException("Invalid double: " + s);
ScriptHelper.put("s", s, null);
double d= ScriptHelper.evalDouble("parseFloat(s)", null);
if (isNaN(d))
{
throw new NumberFormatException("Not a parsable double: " + s);
}
return d;
}
/**
* Returns an Double object holding the specified value. Calls to this
* method may be generated by the autoboxing feature.
*/
public static Double valueOf(double value)
{
return new Double(value);
}
/**
* Returns a Double object holding the double value represented by the argument string s.
*/
public static Double valueOf(String s) throws NumberFormatException
{
return new Double(parseDouble(s));
}
/**
* Returns a string representation of this Double object.
*/
public String toString()
{
ScriptHelper.put("value", value, this);
return (String) ScriptHelper.eval("String(value)", this);
}
// public static long doubleToLongBits(double value)
// {
// long result= doubleToRawLongBits(value);
// // Check for NaN based on values of bit fields, maximum
// // exponent and nonzero significand.
// if (((result & DoubleConsts.EXP_BIT_MASK) == DoubleConsts.EXP_BIT_MASK) && (result & DoubleConsts.SIGNIF_BIT_MASK) != 0L)
// result= 0x7ff8000000000000L;
// return result;
// }
public static double longBitsToDouble(long bits)
{
long ihi= (long) (bits >> 32);
long ilo= (long) (bits & 0xffffffffL);
if (ihi < 0)
{
ihi+= 0x100000000L;
}
if (ilo < 0)
{
ilo+= 0x100000000L;
}
boolean negative= (ihi & 0x80000000) != 0;
int exp= (int) ((ihi >> 20) & 0x7ff);
ihi&= 0xfffff; // remove sign bit and exponent
if (exp == 0x0)
{
double d= (ihi * POWER_MINUS_20) + (ilo * POWER_MINUS_52);
d*= POWER_MINUS_1022;
return negative ? (d == 0.0 ? -0.0 : -d) : d;
}
else if (exp == 0x7ff)
{
if (ihi == 0 && ilo == 0)
{
return negative ? Double.NEGATIVE_INFINITY : Double.POSITIVE_INFINITY;
}
else
{
return Double.NaN;
}
}
// Normalize exponent
exp-= 1023;
double d= 1.0 + (ihi * POWER_MINUS_20) + (ilo * POWER_MINUS_52);
if (exp > 0)
{
int bit= 512;
for (int i= 0; i < 10; i++, bit>>= 1)
{
if (exp >= bit)
{
d*= powers[i];
exp-= bit;
}
}
}
else if (exp < 0)
{
while (exp < 0)
{
int bit= 512;
for (int i= 0; i < 10; i++, bit>>= 1)
{
if (exp <= -bit)
{
d*= invPowers[i];
exp+= bit;
}
}
}
}
return negative ? -d : d;
}
// public static double longBitsToDouble(long bits)
// {
// System.out.println("longBitsToDouble:"+bits);
// return 0.0;
//// throw new NotImplementedMethod("Double.longBitsToDouble");
// }
public static long doubleToLongBits(final double v)
{
if (Double.isNaN(v))
{
// IEEE754, NaN exponent bits all 1s, and mantissa is non-zero
return 0x0FFFl << 51;
}
long sign= (v < 0 ? 0x1l << 63 : 0);
long exponent= 0;
double absV= Math.abs(v);
// IEEE754 infinite numbers, exponent all 1s, mantissa is 0
if (Double.isInfinite(v))
{
exponent= 0x07FFl << 52;
}
else
{
if (absV == 0.0)
{
// IEEE754, exponent is 0, mantissa is zero
// we don't handle negative zero at the moment, it istreated as
// positive zero
exponent= 0l;
}
else
{
// get an approximation to the exponent
int guess= (int) Math.floor(Math.log(absV) / Math.log(2));
// force it to -1023, 1023 interval (<= -1023 = denorm/zero)
guess= Math.max(-1023, Math.min(guess, 1023));
// divide away exponent guess
double exp= Math.pow(2, guess);
absV= absV / exp;
// while the number is still bigger than a normalized number
// increment exponent guess
while (absV > 2.0)
{
guess++;
absV/= 2.0;
}
// if the number is smaller than a normalized number
// decrement exponent
while (absV < 1 && guess > 1024)
{
guess--;
absV*= 2;
}
exponent= (guess + 1023l) << 52;
}
}
// if denorm
if (exponent <= 0)
{
absV/= 2;
}
// the input value has now been stripped of its exponent
// and is in the range [0,2), we strip off the leading decimal
// and use the remainer as a percentage of the significand value (2^52)
long mantissa= (long) ((absV % 1) * Math.pow(2, 52));
return sign | exponent | (mantissa & 0xfffffffffffffl);
}
static public boolean isInfinite(double v)
{
return (v == POSITIVE_INFINITY) || (v == NEGATIVE_INFINITY);
}
public static String toString(double d)
{
return d + "";
}
public static int compare(double d1, double d2)
{
if (d1 < d2)
return -1; // Neither val is NaN, thisVal is smaller
if (d1 > d2)
return 1; // Neither val is NaN, thisVal is larger
// Cannot use doubleToRawLongBits because of possibility of NaNs.
long thisBits= Double.doubleToLongBits(d1);
long anotherBits= Double.doubleToLongBits(d2);
return (thisBits == anotherBits ? 0 : // Values are equal
(thisBits < anotherBits ? -1 : // (-0.0, 0.0) or (!NaN, NaN)
1)); // (0.0, -0.0) or (NaN, !NaN)
}
public static int hashCode(double value)
{
return hashCode((long)value);
}
}
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