/*

 * Copyright (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 */

package java.lang;

import org.apidesign.bck2brwsr.core.JavaScriptBody;

/**

 * The {@code Float} class wraps a value of primitive type

 * {@code float} in an object. An object of type

 * {@code Float} contains a single field whose type is

 * {@code float}.

 *

 * <p>In addition, this class provides several methods for converting a

 * {@code float} to a {@code String} and a

 * {@code String} to a {@code float}, as well as other

 * constants and methods useful when dealing with a

 * {@code float}.

 *

 * @author  Lee Boynton

 * @author  Arthur van Hoff

 * @author  Joseph D. Darcy

 * @since JDK1.0

 */

public final class Float extends Number implements Comparable<Float> {

    /**

     * A constant holding the positive infinity of type

     * {@code float}. It is equal to the value returned by

     * {@code Float.intBitsToFloat(0x7f800000)}.

     */

    public static final float POSITIVE_INFINITY = 1.0f / 0.0f;

    /**

     * A constant holding the negative infinity of type

     * {@code float}. It is equal to the value returned by

     * {@code Float.intBitsToFloat(0xff800000)}.

     */

    public static final float NEGATIVE_INFINITY = -1.0f / 0.0f;

    /**

     * A constant holding a Not-a-Number (NaN) value of type

     * {@code float}.  It is equivalent to the value returned by

     * {@code Float.intBitsToFloat(0x7fc00000)}.

     */

    public static final float NaN = 0.0f / 0.0f;

    /**

     * A constant holding the largest positive finite value of type

     * {@code float}, (2-2<sup>-23</sup>)&middot;2<sup>127</sup>.

     * It is equal to the hexadecimal floating-point literal

     * {@code 0x1.fffffeP+127f} and also equal to

     * {@code Float.intBitsToFloat(0x7f7fffff)}.

     */

    public static final float MAX_VALUE = 0x1.fffffeP+127f; // 3.4028235e+38f

    /**

     * A constant holding the smallest positive normal value of type

     * {@code float}, 2<sup>-126</sup>.  It is equal to the

     * hexadecimal floating-point literal {@code 0x1.0p-126f} and also

     * equal to {@code Float.intBitsToFloat(0x00800000)}.

     *

     * @since 1.6

     */

    public static final float MIN_NORMAL = 0x1.0p-126f; // 1.17549435E-38f

    /**

     * A constant holding the smallest positive nonzero value of type

     * {@code float}, 2<sup>-149</sup>. It is equal to the

     * hexadecimal floating-point literal {@code 0x0.000002P-126f}

     * and also equal to {@code Float.intBitsToFloat(0x1)}.

     */

    public static final float MIN_VALUE = 0x0.000002P-126f; // 1.4e-45f

    /**

     * Maximum exponent a finite {@code float} variable may have.  It

     * is equal to the value returned by {@code

     * Math.getExponent(Float.MAX_VALUE)}.

     *

     * @since 1.6

     */

    public static final int MAX_EXPONENT = 127;

    /**

     * Minimum exponent a normalized {@code float} variable may have.

     * It is equal to the value returned by {@code

     * Math.getExponent(Float.MIN_NORMAL)}.

     *

     * @since 1.6

     */

    public static final int MIN_EXPONENT = -126;

    /**

     * The number of bits used to represent a {@code float} value.

     *

     * @since 1.5

     */

    public static final int SIZE = 32;

    /**

     * The {@code Class} instance representing the primitive type

     * {@code float}.

     *

     * @since JDK1.1

     */

    public static final Class<Float> TYPE = Class.getPrimitiveClass("float");

    /**

     * Returns a string representation of the {@code float}

     * argument. All characters mentioned below are ASCII characters.

     * <ul>

     * <li>If the argument is NaN, the result is the string

     * "{@code NaN}".

     * <li>Otherwise, the result is a string that represents the sign and

     *     magnitude (absolute value) of the argument. If the sign is

     *     negative, the first character of the result is

     *     '{@code -}' (<code>'&#92;u002D'</code>); if the sign is

     *     positive, no sign character appears in the result. As for

     *     the magnitude <i>m</i>:

     * <ul>

     * <li>If <i>m</i> is infinity, it is represented by the characters

     *     {@code "Infinity"}; thus, positive infinity produces

     *     the result {@code "Infinity"} and negative infinity

     *     produces the result {@code "-Infinity"}.

     * <li>If <i>m</i> is zero, it is represented by the characters

     *     {@code "0.0"}; thus, negative zero produces the result

     *     {@code "-0.0"} and positive zero produces the result

     *     {@code "0.0"}.

     * <li> If <i>m</i> is greater than or equal to 10<sup>-3</sup> but

     *      less than 10<sup>7</sup>, then it is represented as the

     *      integer part of <i>m</i>, in decimal form with no leading

     *      zeroes, followed by '{@code .}'

     *      (<code>'&#92;u002E'</code>), followed by one or more

     *      decimal digits representing the fractional part of

     *      <i>m</i>.

     * <li> If <i>m</i> is less than 10<sup>-3</sup> or greater than or

     *      equal to 10<sup>7</sup>, then it is represented in

     *      so-called "computerized scientific notation." Let <i>n</i>

     *      be the unique integer such that 10<sup><i>n</i> </sup>&le;

     *      <i>m</i> {@literal <} 10<sup><i>n</i>+1</sup>; then let <i>a</i>

     *      be the mathematically exact quotient of <i>m</i> and

     *      10<sup><i>n</i></sup> so that 1 &le; <i>a</i> {@literal <} 10.

     *      The magnitude is then represented as the integer part of

     *      <i>a</i>, as a single decimal digit, followed by

     *      '{@code .}' (<code>'&#92;u002E'</code>), followed by

     *      decimal digits representing the fractional part of

     *      <i>a</i>, followed by the letter '{@code E}'

     *      (<code>'&#92;u0045'</code>), followed by a representation

     *      of <i>n</i> as a decimal integer, as produced by the

     *      method {@link java.lang.Integer#toString(int)}.

     *

     * </ul>

     * </ul>

     * How many digits must be printed for the fractional part of

     * <i>m</i> or <i>a</i>? There must be at least one digit

     * to represent the fractional part, and beyond that as many, but

     * only as many, more digits as are needed to uniquely distinguish

     * the argument value from adjacent values of type

     * {@code float}. That is, suppose that <i>x</i> is the

     * exact mathematical value represented by the decimal

     * representation produced by this method for a finite nonzero

     * argument <i>f</i>. Then <i>f</i> must be the {@code float}

     * value nearest to <i>x</i>; or, if two {@code float} values are

     * equally close to <i>x</i>, then <i>f</i> must be one of

     * them and the least significant bit of the significand of

     * <i>f</i> must be {@code 0}.

     *

     * <p>To create localized string representations of a floating-point

     * value, use subclasses of {@link java.text.NumberFormat}.

     *

     * @param   f   the float to be converted.

     * @return a string representation of the argument.

     */

    public static String toString(float f) {

        return Double.toString(f);

    }

    /**

     * Returns a hexadecimal string representation of the

     * {@code float} argument. All characters mentioned below are

     * ASCII characters.

     *

     * <ul>

     * <li>If the argument is NaN, the result is the string

     *     "{@code NaN}".

     * <li>Otherwise, the result is a string that represents the sign and

     * magnitude (absolute value) of the argument. If the sign is negative,

     * the first character of the result is '{@code -}'

     * (<code>'&#92;u002D'</code>); if the sign is positive, no sign character

     * appears in the result. As for the magnitude <i>m</i>:

     *

     * <ul>

     * <li>If <i>m</i> is infinity, it is represented by the string

     * {@code "Infinity"}; thus, positive infinity produces the

     * result {@code "Infinity"} and negative infinity produces

     * the result {@code "-Infinity"}.

     *

     * <li>If <i>m</i> is zero, it is represented by the string

     * {@code "0x0.0p0"}; thus, negative zero produces the result

     * {@code "-0x0.0p0"} and positive zero produces the result

     * {@code "0x0.0p0"}.

     *

     * <li>If <i>m</i> is a {@code float} value with a

     * normalized representation, substrings are used to represent the

     * significand and exponent fields.  The significand is

     * represented by the characters {@code "0x1."}

     * followed by a lowercase hexadecimal representation of the rest

     * of the significand as a fraction.  Trailing zeros in the

     * hexadecimal representation are removed unless all the digits

     * are zero, in which case a single zero is used. Next, the

     * exponent is represented by {@code "p"} followed

     * by a decimal string of the unbiased exponent as if produced by

     * a call to {@link Integer#toString(int) Integer.toString} on the

     * exponent value.

     *

     * <li>If <i>m</i> is a {@code float} value with a subnormal

     * representation, the significand is represented by the

     * characters {@code "0x0."} followed by a

     * hexadecimal representation of the rest of the significand as a

     * fraction.  Trailing zeros in the hexadecimal representation are

     * removed. Next, the exponent is represented by

     * {@code "p-126"}.  Note that there must be at

     * least one nonzero digit in a subnormal significand.

     *

     * </ul>

     *

     * </ul>

     *

     * <table border>

     * <caption><h3>Examples</h3></caption>

     * <tr><th>Floating-point Value</th><th>Hexadecimal String</th>

     * <tr><td>{@code 1.0}</td> <td>{@code 0x1.0p0}</td>

     * <tr><td>{@code -1.0}</td>        <td>{@code -0x1.0p0}</td>

     * <tr><td>{@code 2.0}</td> <td>{@code 0x1.0p1}</td>

     * <tr><td>{@code 3.0}</td> <td>{@code 0x1.8p1}</td>

     * <tr><td>{@code 0.5}</td> <td>{@code 0x1.0p-1}</td>

     * <tr><td>{@code 0.25}</td>        <td>{@code 0x1.0p-2}</td>

     * <tr><td>{@code Float.MAX_VALUE}</td>

     *     <td>{@code 0x1.fffffep127}</td>

     * <tr><td>{@code Minimum Normal Value}</td>

     *     <td>{@code 0x1.0p-126}</td>

     * <tr><td>{@code Maximum Subnormal Value}</td>

     *     <td>{@code 0x0.fffffep-126}</td>

     * <tr><td>{@code Float.MIN_VALUE}</td>

     *     <td>{@code 0x0.000002p-126}</td>

     * </table>

     * @param   f   the {@code float} to be converted.

     * @return a hex string representation of the argument.

     * @since 1.5

     * @author Joseph D. Darcy

     */

    public static String toHexString(float f) {

        throw new UnsupportedOperationException();

//        if (Math.abs(f) < FloatConsts.MIN_NORMAL

//            &&  f != 0.0f ) {// float subnormal

//            // Adjust exponent to create subnormal double, then

//            // replace subnormal double exponent with subnormal float

//            // exponent

//            String s = Double.toHexString(FpUtils.scalb((double)f,

//                                                        /* -1022+126 */

//                                                        DoubleConsts.MIN_EXPONENT-

//                                                        FloatConsts.MIN_EXPONENT));

//            return s.replaceFirst("p-1022$", "p-126");

//        }

//        else // double string will be the same as float string

//            return Double.toHexString(f);

    }

    /**

     * Returns a {@code Float} object holding the

     * {@code float} value represented by the argument string

     * {@code s}.

     *

     * <p>If {@code s} is {@code null}, then a

     * {@code NullPointerException} is thrown.

     *

     * <p>Leading and trailing whitespace characters in {@code s}

     * are ignored.  Whitespace is removed as if by the {@link

     * String#trim} method; that is, both ASCII space and control

     * characters are removed. The rest of {@code s} should

     * constitute a <i>FloatValue</i> as described by the lexical

     * syntax rules:

     *

     * <blockquote>

     * <dl>

     * <dt><i>FloatValue:</i>

     * <dd><i>Sign<sub>opt</sub></i> {@code NaN}

     * <dd><i>Sign<sub>opt</sub></i> {@code Infinity}

     * <dd><i>Sign<sub>opt</sub> FloatingPointLiteral</i>

     * <dd><i>Sign<sub>opt</sub> HexFloatingPointLiteral</i>

     * <dd><i>SignedInteger</i>

     * </dl>

     *

     * <p>

     *

     * <dl>

     * <dt><i>HexFloatingPointLiteral</i>:

     * <dd> <i>HexSignificand BinaryExponent FloatTypeSuffix<sub>opt</sub></i>

     * </dl>

     *

     * <p>

     *

     * <dl>

     * <dt><i>HexSignificand:</i>

     * <dd><i>HexNumeral</i>

     * <dd><i>HexNumeral</i> {@code .}

     * <dd>{@code 0x} <i>HexDigits<sub>opt</sub>

     *     </i>{@code .}<i> HexDigits</i>

     * <dd>{@code 0X}<i> HexDigits<sub>opt</sub>

     *     </i>{@code .} <i>HexDigits</i>

     * </dl>

     *

     * <p>

     *

     * <dl>

     * <dt><i>BinaryExponent:</i>

     * <dd><i>BinaryExponentIndicator SignedInteger</i>

     * </dl>

     *

     * <p>

     *

     * <dl>

     * <dt><i>BinaryExponentIndicator:</i>

     * <dd>{@code p}

     * <dd>{@code P}

     * </dl>

     *

     * </blockquote>

     *

     * where <i>Sign</i>, <i>FloatingPointLiteral</i>,

     * <i>HexNumeral</i>, <i>HexDigits</i>, <i>SignedInteger</i> and

     * <i>FloatTypeSuffix</i> are as defined in the lexical structure

     * sections of

     * <cite>The Java&trade; Language Specification</cite>,

     * except that underscores are not accepted between digits.

     * If {@code s} does not have the form of

     * a <i>FloatValue</i>, then a {@code NumberFormatException}

     * is thrown. Otherwise, {@code s} is regarded as

     * representing an exact decimal value in the usual

     * "computerized scientific notation" or as an exact

     * hexadecimal value; this exact numerical value is then

     * conceptually converted to an "infinitely precise"

     * binary value that is then rounded to type {@code float}

     * by the usual round-to-nearest rule of IEEE 754 floating-point

     * arithmetic, which includes preserving the sign of a zero

     * value.

     *

     * Note that the round-to-nearest rule also implies overflow and

     * underflow behaviour; if the exact value of {@code s} is large

     * enough in magnitude (greater than or equal to ({@link

     * #MAX_VALUE} + {@link Math#ulp(float) ulp(MAX_VALUE)}/2),

     * rounding to {@code float} will result in an infinity and if the

     * exact value of {@code s} is small enough in magnitude (less

     * than or equal to {@link #MIN_VALUE}/2), rounding to float will

     * result in a zero.

     *

     * Finally, after rounding a {@code Float} object representing

     * this {@code float} value is returned.

     *

     * <p>To interpret localized string representations of a

     * floating-point value, use subclasses of {@link

     * java.text.NumberFormat}.

     *

     * <p>Note that trailing format specifiers, specifiers that

     * determine the type of a floating-point literal

     * ({@code 1.0f} is a {@code float} value;

     * {@code 1.0d} is a {@code double} value), do

     * <em>not</em> influence the results of this method.  In other

     * words, the numerical value of the input string is converted

     * directly to the target floating-point type.  In general, the

     * two-step sequence of conversions, string to {@code double}

     * followed by {@code double} to {@code float}, is

     * <em>not</em> equivalent to converting a string directly to

     * {@code float}.  For example, if first converted to an

     * intermediate {@code double} and then to

     * {@code float}, the string<br>

     * {@code "1.00000017881393421514957253748434595763683319091796875001d"}<br>

     * results in the {@code float} value

     * {@code 1.0000002f}; if the string is converted directly to

     * {@code float}, <code>1.000000<b>1</b>f</code> results.

     *

     * <p>To avoid calling this method on an invalid string and having

     * a {@code NumberFormatException} be thrown, the documentation

     * for {@link Double#valueOf Double.valueOf} lists a regular

     * expression which can be used to screen the input.

     *

     * @param   s   the string to be parsed.

     * @return  a {@code Float} object holding the value

     *          represented by the {@code String} argument.

     * @throws  NumberFormatException  if the string does not contain a

     *          parsable number.

     */

    public static Float valueOf(String s) throws NumberFormatException {

        throw new UnsupportedOperationException();

//        return new Float(FloatingDecimal.readJavaFormatString(s).floatValue());

    }

    /**

     * Returns a {@code Float} instance representing the specified

     * {@code float} value.

     * If a new {@code Float} instance is not required, this method

     * should generally be used in preference to the constructor

     * {@link #Float(float)}, as this method is likely to yield

     * significantly better space and time performance by caching

     * frequently requested values.

     *

     * @param  f a float value.

     * @return a {@code Float} instance representing {@code f}.

     * @since  1.5

     */

    public static Float valueOf(float f) {

        return new Float(f);

    }

    /**

     * Returns a new {@code float} initialized to the value

     * represented by the specified {@code String}, as performed

     * by the {@code valueOf} method of class {@code Float}.

     *

     * @param  s the string to be parsed.

     * @return the {@code float} value represented by the string

     *         argument.

     * @throws NullPointerException  if the string is null

     * @throws NumberFormatException if the string does not contain a

     *               parsable {@code float}.

     * @see    java.lang.Float#valueOf(String)

     * @since 1.2

     */

    public static float parseFloat(String s) throws NumberFormatException {

        throw new UnsupportedOperationException();

//        return FloatingDecimal.readJavaFormatString(s).floatValue();

    }

    /**

     * Returns {@code true} if the specified number is a

     * Not-a-Number (NaN) value, {@code false} otherwise.

     *

     * @param   v   the value to be tested.

     * @return  {@code true} if the argument is NaN;

     *          {@code false} otherwise.

     */

    static public boolean isNaN(float v) {

        return (v != v);

    }

    /**

     * Returns {@code true} if the specified number is infinitely

     * large in magnitude, {@code false} otherwise.

     *

     * @param   v   the value to be tested.

     * @return  {@code true} if the argument is positive infinity or

     *          negative infinity; {@code false} otherwise.

     */

    static public boolean isInfinite(float v) {

        return (v == POSITIVE_INFINITY) || (v == NEGATIVE_INFINITY);

    }

    /**

     * The value of the Float.

     *

     * @serial

     */

    private final float value;

    /**

     * Constructs a newly allocated {@code Float} object that

     * represents the primitive {@code float} argument.

     *

     * @param   value   the value to be represented by the {@code Float}.

     */

    public Float(float value) {

        this.value = value;

    }

    /**

     * Constructs a newly allocated {@code Float} object that

     * represents the argument converted to type {@code float}.

     *

     * @param   value   the value to be represented by the {@code Float}.

     */

    public Float(double value) {

        this.value = (float)value;

    }

    /**

     * Constructs a newly allocated {@code Float} object that

     * represents the floating-point value of type {@code float}

     * represented by the string. The string is converted to a

     * {@code float} value as if by the {@code valueOf} method.

     *

     * @param      s   a string to be converted to a {@code Float}.

     * @throws  NumberFormatException  if the string does not contain a

     *               parsable number.

     * @see        java.lang.Float#valueOf(java.lang.String)

     */

    public Float(String s) throws NumberFormatException {

        // REMIND: this is inefficient

        this(valueOf(s).floatValue());

    }

    /**

     * Returns {@code true} if this {@code Float} value is a

     * Not-a-Number (NaN), {@code false} otherwise.

     *

     * @return  {@code true} if the value represented by this object is

     *          NaN; {@code false} otherwise.

     */

    public boolean isNaN() {

        return isNaN(value);

    }

    /**

     * Returns {@code true} if this {@code Float} value is

     * infinitely large in magnitude, {@code false} otherwise.

     *

     * @return  {@code true} if the value represented by this object is

     *          positive infinity or negative infinity;

     *          {@code false} otherwise.

     */

    public boolean isInfinite() {

        return isInfinite(value);

    }

    /**

     * Returns a string representation of this {@code Float} object.

     * The primitive {@code float} value represented by this object

     * is converted to a {@code String} exactly as if by the method

     * {@code toString} of one argument.

     *

     * @return  a {@code String} representation of this object.

     * @see java.lang.Float#toString(float)

     */

    public String toString() {

        return Float.toString(value);

    }

    /**

     * Returns the value of this {@code Float} as a {@code byte} (by

     * casting to a {@code byte}).

     *

     * @return  the {@code float} value represented by this object

     *          converted to type {@code byte}

     */

    public byte byteValue() {

        return (byte)value;

    }

    /**

     * Returns the value of this {@code Float} as a {@code short} (by

     * casting to a {@code short}).

     *

     * @return  the {@code float} value represented by this object

     *          converted to type {@code short}

     * @since JDK1.1

     */

    public short shortValue() {

        return (short)value;

    }

    /**

     * Returns the value of this {@code Float} as an {@code int} (by

     * casting to type {@code int}).

     *

     * @return  the {@code float} value represented by this object

     *          converted to type {@code int}

     */

    public int intValue() {

        return (int)value;

    }

    /**

     * Returns value of this {@code Float} as a {@code long} (by

     * casting to type {@code long}).

     *

     * @return  the {@code float} value represented by this object

     *          converted to type {@code long}

     */

    public long longValue() {

        return (long)value;

    }

    /**

     * Returns the {@code float} value of this {@code Float} object.

     *

     * @return the {@code float} value represented by this object

     */

    public float floatValue() {

        return value;

    }

    /**

     * Returns the {@code double} value of this {@code Float} object.

     *

     * @return the {@code float} value represented by this

     *         object is converted to type {@code double} and the

     *         result of the conversion is returned.

     */

    public double doubleValue() {

        return (double)value;

    }

    /**

     * Returns a hash code for this {@code Float} object. The

     * result is the integer bit representation, exactly as produced

     * by the method {@link #floatToIntBits(float)}, of the primitive

     * {@code float} value represented by this {@code Float}

     * object.

     *

     * @return a hash code value for this object.

     */

    public int hashCode() {

        return floatToIntBits(value);

    }

    /**

     * Compares this object against the specified object.  The result

     * is {@code true} if and only if the argument is not

     * {@code null} and is a {@code Float} object that

     * represents a {@code float} with the same value as the

     * {@code float} represented by this object. For this

     * purpose, two {@code float} values are considered to be the

     * same if and only if the method {@link #floatToIntBits(float)}

     * returns the identical {@code int} value when applied to

     * each.

     *

     * <p>Note that in most cases, for two instances of class

     * {@code Float}, {@code f1} and {@code f2}, the value

     * of {@code f1.equals(f2)} is {@code true} if and only if

     *

     * <blockquote><pre>

     *   f1.floatValue() == f2.floatValue()

     * </pre></blockquote>

     *

     * <p>also has the value {@code true}. However, there are two exceptions:

     * <ul>

     * <li>If {@code f1} and {@code f2} both represent

     *     {@code Float.NaN}, then the {@code equals} method returns

     *     {@code true}, even though {@code Float.NaN==Float.NaN}

     *     has the value {@code false}.

     * <li>If {@code f1} represents {@code +0.0f} while

     *     {@code f2} represents {@code -0.0f}, or vice

     *     versa, the {@code equal} test has the value

     *     {@code false}, even though {@code 0.0f==-0.0f}

     *     has the value {@code true}.

     * </ul>

     *

     * This definition allows hash tables to operate properly.

     *

     * @param obj the object to be compared

     * @return  {@code true} if the objects are the same;

     *          {@code false} otherwise.

     * @see java.lang.Float#floatToIntBits(float)

     */

    public boolean equals(Object obj) {

        return (obj instanceof Float)

               && (floatToIntBits(((Float)obj).value) == floatToIntBits(value));

    }

    /**

     * Returns a representation of the specified floating-point value

     * according to the IEEE 754 floating-point "single format" bit

     * layout.

     *

     * <p>Bit 31 (the bit that is selected by the mask

     * {@code 0x80000000}) represents the sign of the floating-point

     * number.

     * Bits 30-23 (the bits that are selected by the mask

     * {@code 0x7f800000}) represent the exponent.

     * Bits 22-0 (the bits that are selected by the mask

     * {@code 0x007fffff}) represent the significand (sometimes called

     * the mantissa) of the floating-point number.

     *

     * <p>If the argument is positive infinity, the result is

     * {@code 0x7f800000}.

     *

     * <p>If the argument is negative infinity, the result is

     * {@code 0xff800000}.

     *

     * <p>If the argument is NaN, the result is {@code 0x7fc00000}.

     *

     * <p>In all cases, the result is an integer that, when given to the

     * {@link #intBitsToFloat(int)} method, will produce a floating-point

     * value the same as the argument to {@code floatToIntBits}

     * (except all NaN values are collapsed to a single

     * "canonical" NaN value).

     *

     * @param   value   a floating-point number.

     * @return the bits that represent the floating-point number.

     */

    public static int floatToIntBits(float value) {

        final int EXP_BIT_MASK = 2139095040;

        final int SIGNIF_BIT_MASK = 8388607;

        int result = floatToRawIntBits(value);

        // Check for NaN based on values of bit fields, maximum

        // exponent and nonzero significand.

        if ( ((result & EXP_BIT_MASK) ==

              EXP_BIT_MASK) &&

             (result & SIGNIF_BIT_MASK) != 0)

            result = 0x7fc00000;

        return result;

    }

    /**

     * Returns a representation of the specified floating-point value

     * according to the IEEE 754 floating-point "single format" bit

     * layout, preserving Not-a-Number (NaN) values.

     *

     * <p>Bit 31 (the bit that is selected by the mask

     * {@code 0x80000000}) represents the sign of the floating-point

     * number.

     * Bits 30-23 (the bits that are selected by the mask

     * {@code 0x7f800000}) represent the exponent.

     * Bits 22-0 (the bits that are selected by the mask

     * {@code 0x007fffff}) represent the significand (sometimes called

     * the mantissa) of the floating-point number.

     *

     * <p>If the argument is positive infinity, the result is

     * {@code 0x7f800000}.

     *

     * <p>If the argument is negative infinity, the result is

     * {@code 0xff800000}.

     *

     * <p>If the argument is NaN, the result is the integer representing

     * the actual NaN value.  Unlike the {@code floatToIntBits}

     * method, {@code floatToRawIntBits} does not collapse all the

     * bit patterns encoding a NaN to a single "canonical"

     * NaN value.

     *

     * <p>In all cases, the result is an integer that, when given to the

     * {@link #intBitsToFloat(int)} method, will produce a

     * floating-point value the same as the argument to

     * {@code floatToRawIntBits}.

     *

     * @param   value   a floating-point number.

     * @return the bits that represent the floating-point number.

     * @since 1.3

     */

    @JavaScriptBody(args = { "value" }, body = ""

        + "var a = new ArrayBuffer(4);"

        + "new Float32Array(a)[0] = value;"

        + "return new Int32Array(a)[0];"

    )

    public static native int floatToRawIntBits(float value);

    /**

     * Returns the {@code float} value corresponding to a given

     * bit representation.

     * The argument is considered to be a representation of a

     * floating-point value according to the IEEE 754 floating-point

     * "single format" bit layout.

     *

     * <p>If the argument is {@code 0x7f800000}, the result is positive

     * infinity.

     *

     * <p>If the argument is {@code 0xff800000}, the result is negative

     * infinity.

     *

     * <p>If the argument is any value in the range

     * {@code 0x7f800001} through {@code 0x7fffffff} or in

     * the range {@code 0xff800001} through

     * {@code 0xffffffff}, the result is a NaN.  No IEEE 754

     * floating-point operation provided by Java can distinguish

     * between two NaN values of the same type with different bit

     * patterns.  Distinct values of NaN are only distinguishable by

     * use of the {@code Float.floatToRawIntBits} method.

     *

     * <p>In all other cases, let <i>s</i>, <i>e</i>, and <i>m</i> be three

     * values that can be computed from the argument:

     *

     * <blockquote><pre>

     * int s = ((bits >> 31) == 0) ? 1 : -1;

     * int e = ((bits >> 23) & 0xff);

     * int m = (e == 0) ?

     *                 (bits & 0x7fffff) << 1 :

     *                 (bits & 0x7fffff) | 0x800000;

     * </pre></blockquote>

     *

     * Then the floating-point result equals the value of the mathematical

     * expression <i>s</i>&middot;<i>m</i>&middot;2<sup><i>e</i>-150</sup>.

     *

     * <p>Note that this method may not be able to return a

     * {@code float} NaN with exactly same bit pattern as the

     * {@code int} argument.  IEEE 754 distinguishes between two

     * kinds of NaNs, quiet NaNs and <i>signaling NaNs</i>.  The

     * differences between the two kinds of NaN are generally not

     * visible in Java.  Arithmetic operations on signaling NaNs turn

     * them into quiet NaNs with a different, but often similar, bit

     * pattern.  However, on some processors merely copying a

     * signaling NaN also performs that conversion.  In particular,

     * copying a signaling NaN to return it to the calling method may

     * perform this conversion.  So {@code intBitsToFloat} may

     * not be able to return a {@code float} with a signaling NaN

     * bit pattern.  Consequently, for some {@code int} values,

     * {@code floatToRawIntBits(intBitsToFloat(start))} may

     * <i>not</i> equal {@code start}.  Moreover, which

     * particular bit patterns represent signaling NaNs is platform

     * dependent; although all NaN bit patterns, quiet or signaling,

     * must be in the NaN range identified above.

     *

     * @param   bits   an integer.

     * @return  the {@code float} floating-point value with the same bit

     *          pattern.

     */

    @JavaScriptBody(args = "bits",

        body = 

          "var s = ((bits >> 31) == 0) ? 1 : -1;\n"

        + "var e = ((bits >> 23) & 0xff);\n"

        + "if (e === 0xff) {\n"

        + "  if ((bits & 0x7fffff) === 0) {\n"

        + "    return (s > 0) ? Number.POSITIVE_INFINITY"

                          + " : Number.NEGATIVE_INFINITY;\n"

        + "  }\n"

        + "  return Number.NaN;\n"

        + "}\n"

        + "var m = (e === 0) ?\n"

        + "  (bits & 0x7fffff) << 1 :\n"

        + "  (bits & 0x7fffff) | 0x800000;\n"

        + "return s * m * Math.pow(2.0, e - 150);\n"

    )

    public static native float intBitsToFloat(int bits);

    /**

     * Compares two {@code Float} objects numerically.  There are

     * two ways in which comparisons performed by this method differ

     * from those performed by the Java language numerical comparison

     * operators ({@code <, <=, ==, >=, >}) when

     * applied to primitive {@code float} values:

     *

     * <ul><li>

     *          {@code Float.NaN} is considered by this method to

     *          be equal to itself and greater than all other

     *          {@code float} values

     *          (including {@code Float.POSITIVE_INFINITY}).

     * <li>

     *          {@code 0.0f} is considered by this method to be greater

     *          than {@code -0.0f}.

     * </ul>

     *

     * This ensures that the <i>natural ordering</i> of {@code Float}

     * objects imposed by this method is <i>consistent with equals</i>.

     *

     * @param   anotherFloat   the {@code Float} to be compared.

     * @return  the value {@code 0} if {@code anotherFloat} is

     *          numerically equal to this {@code Float}; a value

     *          less than {@code 0} if this {@code Float}

     *          is numerically less than {@code anotherFloat};

     *          and a value greater than {@code 0} if this

     *          {@code Float} is numerically greater than

     *          {@code anotherFloat}.

     *

     * @since   1.2

     * @see Comparable#compareTo(Object)

     */

    public int compareTo(Float anotherFloat) {

        return Float.compare(value, anotherFloat.value);

    }

    /**

     * Compares the two specified {@code float} values. The sign

     * of the integer value returned is the same as that of the

     * integer that would be returned by the call:

     * <pre>

     *    new Float(f1).compareTo(new Float(f2))

     * </pre>

     *

     * @param   f1        the first {@code float} to compare.

     * @param   f2        the second {@code float} to compare.

     * @return  the value {@code 0} if {@code f1} is

     *          numerically equal to {@code f2}; a value less than

     *          {@code 0} if {@code f1} is numerically less than

     *          {@code f2}; and a value greater than {@code 0}

     *          if {@code f1} is numerically greater than

     *          {@code f2}.

     * @since 1.4

     */

    public static int compare(float f1, float f2) {

        if (f1 < f2)

            return -1;           // Neither val is NaN, thisVal is smaller

        if (f1 > f2)

            return 1;            // Neither val is NaN, thisVal is larger

        // Cannot use floatToRawIntBits because of possibility of NaNs.

        int thisBits    = Float.floatToIntBits(f1);

        int anotherBits = Float.floatToIntBits(f2);

        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)

    }

    /** use serialVersionUID from JDK 1.0.2 for interoperability */

    private static final long serialVersionUID = -2671257302660747028L;

}