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Diffstat (limited to 'libjava/classpath/gnu/java/math/Fixed.java')
| -rw-r--r-- | libjava/classpath/gnu/java/math/Fixed.java | 220 |
1 files changed, 0 insertions, 220 deletions
diff --git a/libjava/classpath/gnu/java/math/Fixed.java b/libjava/classpath/gnu/java/math/Fixed.java deleted file mode 100644 index 6b210dedaab..00000000000 --- a/libjava/classpath/gnu/java/math/Fixed.java +++ /dev/null @@ -1,220 +0,0 @@ -/* Fixed.java -- Utility methods for fixed point arithmetics - Copyright (C) 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA -02110-1301 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 gnu.java.math; - -/** - * Utility methods for fixed point arithmetics. - */ -public final class Fixed -{ - - /** - * Private constructor to avoid instantiation. - */ - private Fixed() - { - // Forbidden constructor. - } - - /** - * Divides two fixed point values with <code>n</code> digits. - * - * @param n the number of digits - * @param a the first operand as fixed point value - * @param b the second operand as fixed point value - * - * @return <code>a / b</code> as fixed point value - */ - public static int div(int n, int a, int b) - { - return (int) ((((long) a) << n) / b); - } - - /** - * Multiplies two fixed point values with <code>n</code> digits. - * - * @param n the number of digits - * @param a the first operand as fixed point value - * @param b the second operand as fixed point value - * - * @return <code>a * b</code> as fixed point value - */ - public static int mul(int n, int a, int b) - { - return (int) ((((long) a) * b) >> n); - } - - /** - * Returns the ceiling value of a fixed point value <code>a</code> with - * the <code>n</code> digits. - * - * @param n the number of digits - * @param a the fixed point value - * - * @return <code>ceil(a)</code> as fixed point value - */ - public static int ceil(int n, int a) - { - return (a + (1 << n - 1)) & -(1 << n); - } - - /** - * Returns the floor value of a fixed point value <code>a</code> with - * <code>n</code> digits. - * - * @param n the number of digits - * @param a the fixed point value - * - * @return <code>floor(a)</code> as fixed point value - */ - public static int floor(int n, int a) - { - return a & -(1 << n); - } - - /** - * Truncates the number so that only the digits after the point are left. - * - * @param n the number of digits - * @param a the fixed point value - * - * @return the truncated value - */ - public static int trunc(int n, int a) - { - return a & (0xFFFFFFFF >>> 32 - n); - } - - /** - * Returns the round value of a fixed point value <code>a</code> with - * the <code>n</code> digits. - * - * @param n the number of digits - * @param a the fixed point value - * - * @return <code>round(a)</code> as fixed point value - */ - public static int round(int n, int a) - { - return (a + (1 << (n - 1))) & -(1 << n); - } - - /** - * Returns the fixed point value <code>a</code> with <code>n</code> digits - * as float. - * - * @param n the number of digits - * @param a the fixed point value - * - * @return the float value of <code>a</code> - */ - public static float floatValue(int n, int a) - { - return ((float) a) / (1 << n); - } - - /** - * Returns the fixed point value <code>a</code> with <code>n</code> digits - * as double. - * - * @param n the number of digits - * @param a the fixed point value - * - * @return the double value of <code>a</code> - */ - public static double doubleValue(int n, int a) - { - return ((double) a) / (1 << n); - } - - /** - * Returns the fixed point value that corresponds to the specified float - * value <code>a</code> with <code>n</code> digits. - * - * @param n the number of digits - * @param a the float value - * - * @return the fixed point value - */ - public static int fixedValue(int n, float a) - { - return (int) (a * (1 << n)); - } - - /** - * Returns the fixed point value that corresponds to the specified double - * value <code>a</code> with <code>n</code> digits. - * - * @param n the number of digits - * @param a the double value - * - * @return the fixed point value - */ - public static int fixedValue(int n, double a) - { - return (int) (a * (1 << n)); - } - - /** - * Returns the integer value of the specified fixed point value - * <code>a</code>. This simply cuts of the digits (== floor(a)). - * - * @param n the number of digits - * @param a the fixed point value - * - * @return the integer value - */ - public static int intValue(int n, int a) - { - return a >> n; - } - - /** - * Returns a fixed point decimal as rounded integer value. - * - * @param n the number of digits - * @param a the fixed point number - * - * @return the fixed point decimal as rounded integer value - */ - public static int roundIntValue(int n, int a) - { - return (a + (1 << (n - 1))) >> n; - } -} |