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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [java/] [math/] [MathContext.java] - Blame information for rev 771

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1 771 jeremybenn 
/* MathContext.java --
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   Copyright (C) 1999, 2000, 2002, 2004, 2005  Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING.  If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library.  Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module.  An independent module is a module which is not derived from
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or based on this library.  If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so.  If you do not wish to do so, delete this
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exception statement from your version. */
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package java.math;
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import java.io.Serializable;
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/**
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 * Immutable objects describing settings such as rounding mode and digit
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 * precision for numerical operations such as those in the BigDecimal class.
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 * @author Anthony Balkissoon abalkiss at redhat dot com
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 *
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 */
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public final class MathContext implements Serializable
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{
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  /** A MathContext for unlimited precision arithmetic * */
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  public static final MathContext UNLIMITED =
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    new MathContext(0, RoundingMode.HALF_UP);
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  /**
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   * A MathContext for the IEEE 754R Decimal32 format - 7 digit preicision and
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   * HALF_EVEN rounding.
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   */
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  public static final MathContext DECIMAL32 =
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    new MathContext(7, RoundingMode.HALF_EVEN);
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  /**
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   * A MathContext for the IEEE 754R Decimal64 format - 16 digit preicision and
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   * HALF_EVEN rounding.
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   */
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  public static final MathContext DECIMAL64 =
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    new MathContext(16, RoundingMode.HALF_EVEN);
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  /**
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   * A MathContext for the IEEE 754R Decimal128 format - 34 digit preicision and
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   * HALF_EVEN rounding.
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   */
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  public static final MathContext DECIMAL128 =
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    new MathContext(34, RoundingMode.HALF_EVEN);
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  /**
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   * This is the serialVersionUID reported here:
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   * java.sun.com/j2se/1.5.0/docs/api/serialized-form.html#java.math.MathContext
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   */
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  private static final long serialVersionUID = 5579720004786848255L;
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  private int precision;
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  private RoundingMode roundMode;
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  /**
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   * Constructs a new MathContext with the specified precision and with HALF_UP
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   * rounding.
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   * @param setPrecision the precision for the new MathContext
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   *
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   * @throws IllegalArgumentException if precision is < 0.
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   */
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  public MathContext(int setPrecision)
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  {
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    this(setPrecision, RoundingMode.HALF_UP);
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  }
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  /**
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   * Constructs a new MathContext with the specified precision and rounding
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   * mode.
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   * @param setPrecision the precision
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   * @param setRoundingMode the rounding mode
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   *
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   * @throws IllegalArgumentException if precision is < 0.
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   */
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  public MathContext(int setPrecision, RoundingMode setRoundingMode)
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  {
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    if (setPrecision < 0)
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      throw new IllegalArgumentException("Precision cannot be less than zero.");
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    precision = setPrecision;
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    roundMode = setRoundingMode;
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  }
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  /**
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   * Constructs a MathContext from a String that has the same form as one
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   * produced by the toString() method.
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   * @param val
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   *
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   * @throws IllegalArgumentException if the String is not in the correct
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   * format or if the precision specified is < 0.
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   */
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  public MathContext(String val)
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  {
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    try
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    {
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      int roundingModeIndex = val.indexOf("roundingMode", 10);
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      precision = Integer.parseInt(val.substring(10, roundingModeIndex - 1));
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      roundMode = RoundingMode.valueOf(val.substring(roundingModeIndex + 13));
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    }
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    catch (NumberFormatException nfe)
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    {
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      throw new IllegalArgumentException("String not in correct format");
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    }
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    catch (IllegalArgumentException iae)
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    {
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      throw new IllegalArgumentException("String not in correct format");
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    }
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    if (precision < 0)
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      throw new IllegalArgumentException("Precision cannot be less than 0.");
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  }
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  /**
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   * Returns true if x is a MathContext and has the same precision setting
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   * and rounding mode as this MathContext.
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   *
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   * @return true if the above conditions hold
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   */
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  public boolean equals(Object x)
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  {
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    if (!(x instanceof MathContext))
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      return false;
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    MathContext mc = (MathContext)x;
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    return mc.precision == this.precision
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           && mc.roundMode.equals(this.roundMode);
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  }
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  /**
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   * Returns the precision setting.
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   * @return the precision setting.
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   */
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  public int getPrecision()
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  {
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    return precision;
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  }
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  /**
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   * Returns the rounding mode setting.  This will be one of
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   * RoundingMode.CEILING, RoundingMode.DOWN, RoundingMode.FLOOR,
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   * RoundingMode.HALF_DOWN, RoundingMode.HALF_EVEN, RoundingMode.HALF_UP,
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   * RoundingMode.UNNECESSARY, or RoundingMode.UP.
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   * @return the rounding mode setting.
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   */
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  public RoundingMode getRoundingMode()
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  {
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    return roundMode;
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  }
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  /**
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   * Returns "precision=p roundingMode=MODE" where p is an int giving the
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   * precision and MODE is UP, DOWN, HALF_UP, HALF_DOWN, HALF_EVEN, CEILING,
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   * FLOOR, or UNNECESSARY corresponding to rounding modes.
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   *
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   * @return a String describing this MathContext
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   */
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  public String toString()
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  {
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    return "precision="+precision+" roundingMode="+roundMode;
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  }
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  /**
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   * Returns the hashcode for this MathContext.
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   * @return the hashcode for this MathContext.
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   */
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  public int hashCode()
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  {
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    return precision ^ roundMode.hashCode();
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  }
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}

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