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-rw-r--r--libjava/java/math/BigDecimal.java348
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diff --git a/libjava/java/math/BigDecimal.java b/libjava/java/math/BigDecimal.java
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--- a/libjava/java/math/BigDecimal.java
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-/* java.math.BigDecimal -- Arbitrary precision decimals.
- Copyright (C) 1999, 2000 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.
-
-As a special exception, if you link this library with other files to
-produce an executable, this library does not by itself cause the
-resulting executable to be covered by the GNU General Public License.
-This exception does not however invalidate any other reasons why the
-executable file might be covered by the GNU General Public License. */
-
-package java.math;
-
-import java.math.BigInteger;
-
-public class BigDecimal extends Number implements Comparable {
- BigInteger num;
- int scale;
-
- private final static BigDecimal ZERO =
- new BigDecimal (BigInteger.valueOf (0), 0);
-
- private final static BigDecimal ONE =
- new BigDecimal (BigInteger.valueOf (1), 0);
-
- public final static int ROUND_UP = 0;
- public final static int ROUND_DOWN = 1;
- public final static int ROUND_CEILING = 2;
- public final static int ROUND_FLOOR = 3;
- public final static int ROUND_HALF_UP = 4;
- public final static int ROUND_HALF_DOWN = 5;
- public final static int ROUND_HALF_EVEN = 6;
- public final static int ROUND_UNNECESSARY = 7;
-
- public BigDecimal (BigInteger num)
- {
- this (num, 0);
- }
-
- public BigDecimal (BigInteger num, int scale) throws NumberFormatException
- {
- if (scale < 0)
- throw new NumberFormatException ("scale of " + scale + " is < 0");
- this.num = num;
- this.scale = scale;
- }
-
- public BigDecimal (double num) throws NumberFormatException
- {
- this (Double.toString (num));
- }
-
- public BigDecimal (String num) throws NumberFormatException
- {
- int point = num.indexOf('.');
- this.num = new BigInteger (point == -1 ? num :
- num.substring (0, point) +
- num.substring (point + 1));
- scale = num.length() - (point == -1 ? num.length () : point + 1);
- }
-
- public static BigDecimal valueOf (long val)
- {
- return valueOf (val, 0);
- }
-
- public static BigDecimal valueOf (long val, int scale)
- throws NumberFormatException
- {
- if (scale == 0)
- switch ((int) val)
- {
- case 0:
- return ZERO;
- case 1:
- return ONE;
- }
-
- return new BigDecimal (BigInteger.valueOf (val), scale);
- }
-
- public BigDecimal add (BigDecimal val)
- {
- // For addition, need to line up decimals. Note that the movePointRight
- // method cannot be used for this as it might return a BigDecimal with
- // scale == 0 instead of the scale we need.
- BigInteger op1 = num;
- BigInteger op2 = val.num;
- if (scale < val.scale)
- op1 = op1.multiply (BigInteger.valueOf (10).pow (val.scale - scale));
- else if (scale > val.scale)
- op2 = op2.multiply (BigInteger.valueOf (10).pow (scale - val.scale));
-
- return new BigDecimal (op1.add (op2), Math.max (scale, val.scale));
- }
-
- public BigDecimal subtract (BigDecimal val)
- {
- return this.add(val.negate());
- }
-
- public BigDecimal multiply (BigDecimal val)
- {
- return new BigDecimal (num.multiply (val.num), scale + val.scale);
- }
-
- public BigDecimal divide (BigDecimal val, int roundingMode)
- throws ArithmeticException, IllegalArgumentException
- {
- return divide (val, scale, roundingMode);
- }
-
- public BigDecimal divide(BigDecimal val, int newScale, int roundingMode)
- throws ArithmeticException, IllegalArgumentException
- {
- if (roundingMode < 0 || roundingMode > 7)
- throw
- new IllegalArgumentException("illegal rounding mode: " + roundingMode);
-
- if (scale < 0)
- throw new ArithmeticException ("scale is negative: " + scale);
-
- if (num.signum () == 0) // handle special case of 0.0/0.0
- return ZERO;
-
- BigInteger dividend = num.multiply (BigInteger.valueOf (10).pow
- (newScale + 1 - (scale - val.scale)));
-
- BigInteger parts[] = dividend.divideAndRemainder (val.num);
-// System.out.println("int: " + parts[0]);
-// System.out.println("rem: " + parts[1]);
-
- int roundDigit = parts[0].mod (BigInteger.valueOf (10)).intValue ();
- BigInteger unrounded = parts[0].divide (BigInteger.valueOf (10));
-
- if (roundDigit == 0 && parts[1].signum () == 0) // no rounding necessary
- return new BigDecimal (unrounded, newScale);
-
- int sign = unrounded.signum ();
-
- switch (roundingMode)
- {
- case ROUND_UNNECESSARY:
- throw new ArithmeticException ("newScale is not large enough");
- case ROUND_CEILING:
- roundingMode = (sign == 1) ? ROUND_UP : ROUND_DOWN;
- break;
- case ROUND_FLOOR:
- roundingMode = (sign == 1) ? ROUND_DOWN : ROUND_UP;
- break;
- case ROUND_HALF_UP:
- roundingMode = (roundDigit >= 5) ? ROUND_UP : ROUND_DOWN;
- break;
- case ROUND_HALF_DOWN:
- roundingMode = (roundDigit > 5) ? ROUND_UP : ROUND_DOWN;
- break;
- case ROUND_HALF_EVEN:
- if (roundDigit < 5)
- roundingMode = ROUND_DOWN;
- else
- {
- int rightmost =
- unrounded.mod (BigInteger.valueOf (10)).intValue ();
- if (rightmost % 2 == 1) // odd, then ROUND_HALF_UP
- roundingMode = ROUND_UP;
- else // even, then ROUND_HALF_DOWN
- roundingMode = (roundDigit > 5) ? ROUND_UP : ROUND_DOWN;
- }
- break;
- }
-
- if (roundingMode == ROUND_UP)
- return new BigDecimal (unrounded.add (BigInteger.valueOf (1)), newScale);
-
- // roundingMode == ROUND_DOWN
- return new BigDecimal (unrounded, newScale);
- }
-
- public int compareTo (BigDecimal val)
- {
- if (scale == val.scale)
- return num.compareTo (val.num);
-
- BigInteger thisParts[] =
- num.divideAndRemainder (BigInteger.valueOf (10).pow (scale));
- BigInteger valParts[] =
- val.num.divideAndRemainder (BigInteger.valueOf (10).pow (val.scale));
-
- int compare;
- if ((compare = thisParts[0].compareTo (valParts[0])) != 0)
- return compare;
-
- // quotients are the same, so compare remainders
-
- // remove trailing zeros
- if (thisParts[1].equals (BigInteger.valueOf (0)) == false)
- while (thisParts[1].mod (BigInteger.valueOf (10)).equals
- (BigInteger.valueOf (0)))
- thisParts[1] = thisParts[1].divide (BigInteger.valueOf (10));
- // again...
- if (valParts[1].equals(BigInteger.valueOf (0)) == false)
- while (valParts[1].mod (BigInteger.valueOf (10)).equals
- (BigInteger.valueOf (0)))
- valParts[1] = valParts[1].divide (BigInteger.valueOf (10));
-
- // and compare them
- return thisParts[1].compareTo (valParts[1]);
- }
-
- public int compareTo (Object val)
- {
- return(compareTo((BigDecimal)val));
- }
-
- public boolean equals (Object o)
- {
- return (o instanceof BigDecimal
- && scale == ((BigDecimal) o).scale
- && compareTo ((BigDecimal) o) == 0);
- }
-
- public int hashCode()
- {
- return intValue() ^ scale;
- }
-
- public BigDecimal max (BigDecimal val)
- {
- switch (compareTo (val))
- {
- case 1:
- return this;
- default:
- return val;
- }
- }
-
- public BigDecimal min (BigDecimal val)
- {
- switch (compareTo (val))
- {
- case -1:
- return this;
- default:
- return val;
- }
- }
-
- public BigDecimal movePointLeft (int n)
- {
- return (n < 0) ? movePointRight (-n) : new BigDecimal (num, scale + n);
- }
-
- public BigDecimal movePointRight (int n)
- {
- if (n < 0)
- return movePointLeft (-n);
-
- if (scale >= n)
- return new BigDecimal (num, scale - n);
-
- return new BigDecimal (num.multiply
- (BigInteger.valueOf (10).pow (n - scale)), 0);
- }
-
- public int signum ()
- {
- return num.signum ();
- }
-
- public int scale ()
- {
- return scale;
- }
-
- public BigDecimal abs ()
- {
- return new BigDecimal (num.abs (), scale);
- }
-
- public BigDecimal negate ()
- {
- return new BigDecimal (num.negate (), scale);
- }
-
- public String toString ()
- {
- String bigStr = num.toString();
- if (scale == 0)
- return bigStr;
-
- int point = bigStr.length() - scale;
- boolean negative = (bigStr.charAt(0) == '-');
- StringBuffer sb = new StringBuffer(bigStr.length() + 1 +
- (point <= 0 ? -point+1 : 0));
- if (negative)
- sb.append('-');
- while (point <= 0)
- {
- sb.append('0');
- point++;
- }
- sb.append(bigStr.substring(negative ? 1 : 0));
- sb.insert(point, '.');
- return sb.toString();
- }
-
- public BigInteger toBigInteger ()
- {
- return scale == 0 ? num : num.divide (BigInteger.valueOf (10).pow (scale));
- }
-
-
- public int intValue ()
- {
- return toBigInteger ().intValue ();
- }
-
- public long longValue ()
- {
- return toBigInteger().longValue();
- }
-
- public float floatValue()
- {
- return Float.valueOf(toString()).floatValue();
- }
-
- public double doubleValue()
- {
- return Double.valueOf(toString()).doubleValue();
- }
-}
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