+++ /dev/null
-/* java.lang.Float
- Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath 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 for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-02111-1307 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-
-package java.lang;
-
-import gnu.classpath.Configuration;
-
-/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
- * "The Java Language Specification", ISBN 0-201-63451-1
- * plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
- * Status: Believed complete and correct.
- */
-
-/**
- * Instances of class <code>Float</code> represent primitive
- * <code>float</code> values.
- *
- * Additionally, this class provides various helper functions and variables
- * related to floats.
- *
- * @author Paul Fisher
- * @author Andrew Haley <aph@cygnus.com>
- * @since JDK 1.0
- */
-public final class Float extends Number implements Comparable
-{
- /**
- * The maximum positive value a <code>double</code> may represent
- * is 3.4028235e+38f.
- */
- public static final float MAX_VALUE = 3.4028235e+38f;
-
- /**
- * The minimum positive value a <code>float</code> may represent
- * is 1.4e-45.
- */
- public static final float MIN_VALUE = 1.4e-45f;
-
- /**
- * The value of a float representation -1.0/0.0, negative infinity.
- */
- public static final float NEGATIVE_INFINITY = -1.0f/0.0f;
-
- /**
- * The value of a float representation 1.0/0.0, positive infinity.
- */
- public static final float POSITIVE_INFINITY = 1.0f/0.0f;
-
- /**
- * All IEEE 754 values of NaN have the same value in Java.
- */
- public static final float NaN = 0.0f/0.0f;
-
- /**
- * The primitive type <code>float</code> is represented by this
- * <code>Class</code> object.
- */
- public static final Class TYPE = VMClassLoader.getPrimitiveClass('F');
-
- /**
- * The immutable value of this Float.
- */
- private final float value;
-
- private static final long serialVersionUID = -2671257302660747028L;
-
- static
- {
- if (Configuration.INIT_LOAD_LIBRARY)
- {
- System.loadLibrary ("javalang");
- }
- }
-
- /**
- * Create a <code>float</code> from the primitive <code>Float</code>
- * specified.
- *
- * @param value the <code>Float</code> argument
- */
- public Float (float value)
- {
- this.value = value;
- }
-
- /**
- * Create a <code>Float</code> from the primitive <code>double</code>
- * specified.
- *
- * @param value the <code>double</code> argument
- */
- public Float (double value)
- {
- this.value = (float)value;
- }
-
- /**
- * Create a <code>Float</code> from the specified <code>String</code>.
- *
- * This method calls <code>Float.parseFloat()</code>.
- *
- * @exception NumberFormatException when the <code>String</code> cannot
- * be parsed into a <code>Float</code>.
- * @param s the <code>String</code> to convert
- * @see #parseFloat(java.lang.String)
- */
- public Float (String s) throws NumberFormatException
- {
- this.value = parseFloat (s);
- }
-
- /**
- * Parse the specified <code>String</code> as a <code>float</code>.
- *
- * The number is really read as <em>n * 10<sup>exponent</sup></em>. The
- * first number is <em>n</em>, and if there is an "<code>E</code>"
- * ("<code>e</code>" is also acceptable), then the integer after that is
- * the exponent.
- * <P>
- * Here are the possible forms the number can take:
- * <BR>
- * <TABLE BORDER=1>
- * <TR><TH>Form</TH><TH>Examples</TH></TR>
- * <TR><TD><CODE>[+-]<number>[.]</CODE></TD><TD>345., -10, 12</TD></TR>
- * <TR><TD><CODE>[+-]<number>.<number></CODE></TD><TD>40.2, 80.00, -12.30</TD></TR>
- * <TR><TD><CODE>[+-]<number>[.]E[+-]<number></CODE></TD><TD>80E12, -12e+7, 4.E-123</TD></TR>
- * <TR><TD><CODE>[+-]<number>.<number>E[+-]<number></CODE></TD><TD>6.02e-22, -40.2E+6, 12.3e9</TD></TR>
- * </TABLE>
- *
- * "<code>[+-]</code>" means either a plus or minus sign may go there, or
- * neither, in which case + is assumed.
- * <BR>
- * "<code>[.]</code>" means a dot may be placed here, but is optional.
- * <BR>
- * "<code><number></code>" means a string of digits (0-9), basically
- * an integer. "<code><number>.<number></code>" is basically
- * a real number, a floating-point value.
- * <P>
- * Remember that a <code>float</code> has a limited range. If the
- * number you specify is greater than <code>Float.MAX_VALUE</code> or less
- * than <code>-Float.MAX_VALUE</code>, it will be set at
- * <code>Float.POSITIVE_INFINITY</code> or
- * <code>Float.NEGATIVE_INFINITY</code>, respectively.
- * <P>
- *
- * Note also that <code>float</code> does not have perfect precision. Many
- * numbers cannot be precisely represented. The number you specify
- * will be rounded to the nearest representable value.
- * <code>Float.MIN_VALUE</code> is the margin of error for <code>float</code>
- * values.
- * <P>
- * If an unexpected character is found in the <code>String</code>, a
- * <code>NumberFormatException</code> will be thrown. Spaces are not
- * allowed and will cause this exception to be thrown.
- *
- * @XXX specify where/how we are not in accord with the spec.
- *
- * @param str the <code>String</code> to convert
- * @return the value of the <code>String</code> as a <code>float</code>.
- * @exception NumberFormatException when the string cannot be parsed to a
- * <code>float</code>.
- * @since JDK 1.2
- * @see #MIN_VALUE
- * @see #MAX_VALUE
- * @see #POSITIVE_INFINITY
- * @see #NEGATIVE_INFINITY
- */
- public static float parseFloat (String s) throws NumberFormatException
- {
- // The spec says that parseFloat() should work like
- // Double.valueOf(). This is equivalent, in our implementation,
- // but more efficient.
- return (float) Double.parseDouble (s);
- }
-
- /**
- * Convert the <code>float</code> value of this <code>Float</code>
- * to a <code>String</code>. This method calls
- * <code>Float.toString(float)</code> to do its dirty work.
- *
- * @return the <code>String</code> representation of this <code>Float</code>.
- * @see #toString(float)
- */
- public String toString ()
- {
- return toString (value);
- }
-
- /**
- * If the <code>Object</code> is not <code>null</code>, is an
- * <code>instanceof</code> <code>Float</code>, and represents
- * the same primitive <code>float</code> value return
- * <code>true</code>. Otherwise <code>false</code> is returned.
- * <p>
- * Note that there are two differences between <code>==</code> and
- * <code>equals()</code>. <code>0.0f == -0.0f</code> returns <code>true</code>
- * but <code>new Float(0.0f).equals(new Float(-0.0f))</code> returns
- * <code>false</code>. And <code>Float.NaN == Float.NaN</code> returns
- * <code>false</code>, but
- * <code>new Float(Float.NaN).equals(new Float(Float.NaN))</code> returns
- * <code>true</code>.
- *
- * @param obj the object to compare to
- * @return whether the objects are semantically equal.
- */
- public boolean equals (Object obj)
- {
- if (!(obj instanceof Float))
- return false;
-
- float f = ((Float) obj).value;
-
- // GCJ LOCAL: this implementation is probably faster than
- // Classpath's, especially once we inline floatToIntBits.
- return floatToIntBits (value) == floatToIntBits (f);
- // END GCJ LOCAL
- }
-
- /**
- * Return a hashcode representing this Object.
- * <code>Float</code>'s hash code is calculated by calling the
- * <code>floatToIntBits()</code> function.
- * @return this Object's hash code.
- * @see java.lang.Float.floatToIntBits(float)
- */
- public int hashCode ()
- {
- return floatToIntBits (value);
- }
-
- /**
- * Return the value of this <code>Double</code> when cast to an
- * <code>int</code>.
- */
- public int intValue ()
- {
- return (int) value;
- }
-
- /**
- * Return the value of this <code>Double</code> when cast to a
- * <code>long</code>.
- */
- public long longValue ()
- {
- return (long) value;
- }
-
- /**
- * Return the value of this <code>Double</code> when cast to a
- * <code>float</code>.
- */
- public float floatValue ()
- {
- return (float) value;
- }
-
- /**
- * Return the primitive <code>double</code> value represented by this
- * <code>Double</code>.
- */
- public double doubleValue ()
- {
- return (double) value;
- }
-
- /**
- * Convert the <code>float</code> to a <code>String</code>.
- * <P>
- *
- * Floating-point string representation is fairly complex: here is a
- * rundown of the possible values. "<CODE>[-]</CODE>" indicates that a
- * negative sign will be printed if the value (or exponent) is negative.
- * "<CODE><number></CODE>" means a string of digits (0-9).
- * "<CODE><digit></CODE>" means a single digit (0-9).
- * <P>
- *
- * <TABLE BORDER=1>
- * <TR><TH>Value of Float</TH><TH>String Representation</TH></TR>
- * <TR>
- * <TD>[+-] 0</TD>
- * <TD>[<CODE>-</CODE>]<CODE>0.0</CODE></TD>
- * </TR>
- * <TR>
- * <TD>Between [+-] 10<SUP>-3</SUP> and 10<SUP>7</SUP></TD>
- * <TD><CODE>[-]number.number</CODE></TD>
- * </TR>
- * <TR>
- * <TD>Other numeric value</TD>
- * <TD><CODE>[-]<digit>.<number>E[-]<number></CODE></TD>
- * </TR>
- * <TR>
- * <TD>[+-] infinity</TD>
- * <TD><CODE>[-]Infinity</CODE></TD>
- * </TR>
- * <TR>
- * <TD>NaN</TD>
- * <TD><CODE>NaN</CODE></TD>
- * </TR>
- * </TABLE>
- *
- * Yes, negative zero <EM>is</EM> a possible value. Note that there is
- * <EM>always</EM> a <CODE>.</CODE> and at least one digit printed after
- * it: even if the number is 3, it will be printed as <CODE>3.0</CODE>.
- * After the ".", all digits will be printed except trailing zeros. No
- * truncation or rounding is done by this function.
- *
- * @XXX specify where we are not in accord with the spec.
- *
- * @param f the <code>float</code> to convert
- * @return the <code>String</code> representing the <code>float</code>.
- */
- public static String toString (float f)
- {
- return Double.toString ((double) f, true);
- }
-
- /**
- * Return the result of calling <code>new Float(java.lang.String)</code>.
- *
- * @param s the <code>String</code> to convert to a <code>Float</code>.
- * @return a new <code>Float</code> representing the <code>String</code>'s
- * numeric value.
- *
- * @exception NumberFormatException thrown if <code>String</code> cannot
- * be parsed as a <code>double</code>.
- * @see #Float(java.lang.String)
- * @see #parseFloat(java.lang.String)
- */
- public static Float valueOf (String s) throws NumberFormatException
- {
- return new Float (s);
- }
-
- /**
- * Return <code>true</code> if the value of this <code>Float</code>
- * is the same as <code>NaN</code>, otherwise return <code>false</code>.
- * @return whether this <code>Float</code> is <code>NaN</code>.
- */
- public boolean isNaN ()
- {
- return isNaN (value);
- }
-
- /**
- * Return <code>true</code> if the <code>float</code> has the same
- * value as <code>NaN</code>, otherwise return <code>false</code>.
- *
- * @param v the <code>float</code> to compare
- * @return whether the argument is <code>NaN</code>.
- */
- public static boolean isNaN (float v)
- {
- // This works since NaN != NaN is the only reflexive inequality
- // comparison which returns true.
- return v != v;
- }
-
- /**
- * Return <code>true</code> if the value of this <code>Float</code>
- * is the same as <code>NEGATIVE_INFINITY</code> or
- * <code>POSITIVE_INFINITY</code>, otherwise return <code>false</code>.
- *
- * @return whether this <code>Float</code> is (-/+) infinity.
- */
- public boolean isInfinite ()
- {
- return isInfinite (value);
- }
-
- /**
- * Return <code>true</code> if the <code>float</code> has a value
- * equal to either <code>NEGATIVE_INFINITY</code> or
- * <code>POSITIVE_INFINITY</code>, otherwise return <code>false</code>.
- *
- * @param v the <code>float</code> to compare
- * @return whether the argument is (-/+) infinity.
- */
- public static boolean isInfinite (float v)
- {
- return (v == POSITIVE_INFINITY || v == NEGATIVE_INFINITY);
- }
-
- /**
- * Return the int bits of the specified <code>float</code>.
- * The result of this function can be used as the argument to
- * <code>Float.intBitsToFloat(long)</code> to obtain the
- * original <code>float</code> value.
- *
- * @param value the <code>float</code> to convert
- * @return the bits of the <code>float</code>.
- */
- public static native int floatToIntBits (float value);
-
- /**
- * Return the int bits of the specified <code>float</code>.
- * The result of this function can be used as the argument to
- * <code>Float.intBitsToFloat(long)</code> to obtain the
- * original <code>float</code> value. The difference between
- * this function and <code>floatToIntBits</code> is that this
- * function does not collapse NaN values.
- *
- * @param value the <code>float</code> to convert
- * @return the bits of the <code>float</code>.
- */
- public static native int floatToRawIntBits (float value);
-
- /**
- * Return the <code>float</code> represented by the long
- * bits specified.
- *
- * @param bits the long bits representing a <code>double</code>
- * @return the <code>float</code> represented by the bits.
- */
- public static native float intBitsToFloat (int bits);
-
- /**
- * Returns 0 if the <code>float</code> value of the argument is
- * equal to the value of this <code>Float</code>. Returns a number
- * less than zero if the value of this <code>Float</code> is less
- * than the <code>Float</code> value of the argument, and returns a
- * number greater than zero if the value of this <code>Float</code>
- * is greater than the <code>float</code> value of the argument.
- * <br>
- * <code>Float.NaN</code> is greater than any number other than itself,
- * even <code>Float.POSITIVE_INFINITY</code>.
- * <br>
- * <code>0.0</code> is greater than <code>-0.0</code>.
- *
- * @param f the Float to compare to.
- * @return 0 if the <code>Float</code>s are the same, < 0 if this
- * <code>Float</code> is less than the <code>Float</code> in
- * in question, or > 0 if it is greater.
- *
- * @since 1.2
- */
- public int compareTo (Float f)
- {
- return compare (value, f.value);
- }
-
- /**
- * Returns 0 if the first argument is equal to the second argument.
- * Returns a number less than zero if the first argument is less than the
- * second argument, and returns a number greater than zero if the first
- * argument is greater than the second argument.
- * <br>
- * <code>Float.NaN</code> is greater than any number other than itself,
- * even <code>Float.POSITIVE_INFINITY</code>.
- * <br>
- * <code>0.0</code> is greater than <code>-0.0</code>.
- *
- * @param x the first float to compare.
- * @param y the second float to compare.
- * @return 0 if the arguments are the same, < 0 if the
- * first argument is less than the second argument in
- * in question, or > 0 if it is greater.
- * @since 1.4
- */
- public static int compare (float x, float y)
- {
- if (isNaN (x))
- return isNaN (y) ? 0 : 1;
- if (isNaN (y))
- return -1;
- // recall that 0.0 == -0.0, so we convert to infinities and try again
- if (x == 0 && y == 0)
- return (int) (1 / x - 1 / y);
- if (x == y)
- return 0;
-
- return x > y ? 1 : -1;
- }
-
- /**
- * Compares the specified <code>Object</code> to this <code>Float</code>
- * if and only if the <code>Object</code> is an instanceof
- * <code>Float</code>.
- * Otherwise it throws a <code>ClassCastException</code>
- *
- * @param o the Object to compare to.
- * @return 0 if the <code>Float</code>s are the same, < 0 if this
- * <code>Float</code> is less than the <code>Float</code> in
- * in question, or > 0 if it is greater.
- * @throws ClassCastException if the argument is not a <code>Float</code>
- *
- * @since 1.2
- */
- public int compareTo (Object o)
- {
- return compareTo ((Float) o);
- }
-}
projects / msp430-gcc.git / blobdiff