From 97b8365cafc3a344a22d3980b8ed885f5c6d8357 Mon Sep 17 00:00:00 2001
From: Tom Tromey <tromey@gcc.gnu.org>
Date: Tue, 9 Jan 2007 19:58:05 +0000
Subject: Merged gcj-eclipse branch to trunk.

From-SVN: r120621
---
 libjava/classpath/java/math/MathContext.java | 64 +++++++++++++++++++++++++---
 1 file changed, 59 insertions(+), 5 deletions(-)

(limited to 'libjava/classpath/java/math/MathContext.java')

diff --git a/libjava/classpath/java/math/MathContext.java b/libjava/classpath/java/math/MathContext.java
index 417d9c2e270..533ab13acf3 100644
--- a/libjava/classpath/java/math/MathContext.java
+++ b/libjava/classpath/java/math/MathContext.java
@@ -48,6 +48,30 @@ import java.io.Serializable;
  */
 public final class MathContext implements Serializable
 {
+  /** A MathContext for unlimited precision arithmetic * */
+  public static final MathContext UNLIMITED = 
+    new MathContext(0, RoundingMode.HALF_UP);
+  
+  /**
+   * A MathContext for the IEEE 754R Decimal32 format - 7 digit preicision and
+   * HALF_EVEN rounding.
+   */
+  public static final MathContext DECIMAL32 = 
+    new MathContext(7, RoundingMode.HALF_EVEN);
+  
+  /**
+   * A MathContext for the IEEE 754R Decimal64 format - 16 digit preicision and
+   * HALF_EVEN rounding.
+   */
+  public static final MathContext DECIMAL64 = 
+    new MathContext(16, RoundingMode.HALF_EVEN);
+  
+  /**
+   * A MathContext for the IEEE 754R Decimal128 format - 34 digit preicision and
+   * HALF_EVEN rounding.
+   */
+  public static final MathContext DECIMAL128 = 
+    new MathContext(34, RoundingMode.HALF_EVEN);
   
   /**
    * This is the serialVersionUID reported here:
@@ -56,7 +80,9 @@ public final class MathContext implements Serializable
   private static final long serialVersionUID = 5579720004786848255L;
   
   private int precision;
-    
+  
+  private RoundingMode roundMode;
+  
   /**
    * Constructs a new MathContext with the specified precision and with HALF_UP
    * rounding.
@@ -65,12 +91,26 @@ public final class MathContext implements Serializable
    * @throws IllegalArgumentException if precision is < 0.
    */
   public MathContext(int setPrecision)
+  {
+    this(setPrecision, RoundingMode.HALF_UP);
+  }
+  
+  /**
+   * Constructs a new MathContext with the specified precision and rounding
+   * mode.
+   * @param setPrecision the precision
+   * @param setRoundingMode the rounding mode
+   * 
+   * @throws IllegalArgumentException if precision is < 0.
+   */
+  public MathContext(int setPrecision, RoundingMode setRoundingMode)
   {
     if (setPrecision < 0)
       throw new IllegalArgumentException("Precision cannot be less than zero.");
     precision = setPrecision;
+    roundMode = setRoundingMode;
   }
-    
+  
   /**
    * Constructs a MathContext from a String that has the same form as one
    * produced by the toString() method.
@@ -85,6 +125,7 @@ public final class MathContext implements Serializable
     {
       int roundingModeIndex = val.indexOf("roundingMode", 10);
       precision = Integer.parseInt(val.substring(10, roundingModeIndex - 1));
+      roundMode = RoundingMode.valueOf(val.substring(roundingModeIndex + 13));
     }
     catch (NumberFormatException nfe)
     {
@@ -109,7 +150,8 @@ public final class MathContext implements Serializable
     if (!(x instanceof MathContext))
       return false;
     MathContext mc = (MathContext)x;
-    return mc.precision == this.precision;
+    return mc.precision == this.precision
+           && mc.roundMode.equals(this.roundMode);
   }
   
   /**
@@ -121,6 +163,18 @@ public final class MathContext implements Serializable
     return precision;
   }
   
+  /**
+   * Returns the rounding mode setting.  This will be one of 
+   * RoundingMode.CEILING, RoundingMode.DOWN, RoundingMode.FLOOR, 
+   * RoundingMode.HALF_DOWN, RoundingMode.HALF_EVEN, RoundingMode.HALF_UP, 
+   * RoundingMode.UNNECESSARY, or RoundingMode.UP.
+   * @return the rounding mode setting.
+   */
+  public RoundingMode getRoundingMode()
+  {
+    return roundMode;
+  }
+  
   /**
    * Returns "precision=p roundingMode=MODE" where p is an int giving the 
    * precision and MODE is UP, DOWN, HALF_UP, HALF_DOWN, HALF_EVEN, CEILING,
@@ -130,7 +184,7 @@ public final class MathContext implements Serializable
    */
   public String toString()
   {
-    return "precision="+precision;
+    return "precision="+precision+" roundingMode="+roundMode;
   }
   
   /**
@@ -139,6 +193,6 @@ public final class MathContext implements Serializable
    */
   public int hashCode()
   {
-    return precision;
+    return precision ^ roundMode.hashCode();
   }
 }
-- 
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