Examples of java.math.BigInteger.doubleValue()

java.math.BigInteger.doubleValue()
sun.com/docs/books/jls/second_edition/html/conversions.doc.html#25363">narrowing primitive conversion from {@code double} to{@code float} defined in the Java Language Specification: if this BigInteger has too great a magnitude to represent as a {@code double}, it will be converted to {@link Double#NEGATIVE_INFINITY} or {@link Double#POSITIVE_INFINITY} as appropriate. Note that even whenthe return value is finite, this conversion can lose information about the precision of the BigInteger value. @return this BigInteger converted to a {@code double}.

      
      BigInteger asBigInt = convertLongToUlong(valueAsLong);
      
      // TODO: Check for overflow
      
      return asBigInt.doubleValue();
    case MysqlDefs.FIELD_TYPE_FLOAT:
      return getNativeFloat(columnIndex + 1);
    case MysqlDefs.FIELD_TYPE_BIT:
      return getNumericRepresentationOfSQLBitType(columnIndex + 1);
    default:

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      BigInteger bi = squarD.unscaledValue();     // bi and scale are a tandem
      int biLen = bi.bitLength();
      int shift = Math.max(0, biLen - BITS + (biLen%2 == 0 ? 0 : 1));   // even shift..
      bi = bi.shiftRight(shift);                  // ..floors to 62 or 63 bit BigInteger


      double root = Math.sqrt(bi.doubleValue());
      BigDecimal halfBack = new BigDecimal(BigInteger.ONE.shiftLeft(shift/2));


      int scale = squarD.scale();
      if (scale % 2 == 1) {
          root *= SQRT_10;                        // 5 -> 2, -5 -> -3 need half a scale more..

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      BigInteger asBigInt = convertLongToUlong(valueAsLong);
      
      // TODO: Check for overflow
      
      return asBigInt.doubleValue();
    case MysqlDefs.FIELD_TYPE_FLOAT:
      return (double) getNativeFloat(columnIndex + 1);
    case MysqlDefs.FIELD_TYPE_BIT:
      return getNumericRepresentationOfSQLBitType(columnIndex + 1);
    default:

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    BigInteger bi = squarD.unscaledValue();     // bi and scale are a tandem
    int biLen = bi.bitLength();
    int shift = Math.max( 0, biLen - BITS + (biLen % 2 == 0 ? 0 : 1) );   // even shift..
    bi = bi.shiftRight( shift );                  // ..floors to 62 or 63 bit BigInteger


    double root = Math.sqrt( bi.doubleValue() );
    BigDecimal halfBack = new BigDecimal( BigInteger.ONE.shiftLeft( shift / 2 ) );


    int scale = squarD.scale();
    if ( scale % 2 == 1 ) // add half scales of the root to odds..
    {

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            final Long abs = Long.valueOf(unsignedHexString, 16);
            return isNegative ? -abs : abs;
        }


        final BigInteger bi = new BigInteger(unsignedHexString, 16);
        return isNegative ? -bi.doubleValue() : bi.doubleValue();
    }
    
    /**
     * Constructor.
     *

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            final Long abs = Long.valueOf(unsignedHexString, 16);
            return isNegative ? -abs : abs;
        }


        final BigInteger bi = new BigInteger(unsignedHexString, 16);
        return isNegative ? -bi.doubleValue() : bi.doubleValue();
    }
    
    /**
     * Constructor.
     *

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            if (errMsg != null) {
                return errMsg;
            }


            BigInteger longValue = new BigInteger(hexValue, 16);
            if (longValue.doubleValue() > maxValue) {
                return "'" + longValue + "' exceeds maximum value ["  + new BigDecimal(maxValue).toString() + "].";
            }


            return null;
        }

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         }
      }
      else if(typeCode == XS_UNSIGNEDLONG)
      {
         BigInteger d = new BigInteger(value);
         if(d.doubleValue() < 0 || d.doubleValue() > 18446744073709551615D)
         {
            throw new JBossXBValueFormatException("Invalid unsignedLong value: " + value);
         }
         result = d;
      }

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         }
      }
      else if(typeCode == XS_UNSIGNEDLONG)
      {
         BigInteger d = new BigInteger(value);
         if(d.doubleValue() < 0 || d.doubleValue() > 18446744073709551615D)
         {
            throw new JBossXBValueFormatException("Invalid unsignedLong value: " + value);
         }
         result = d;
      }

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         result = u.toString();
      }
      else if(typeCode == XS_UNSIGNEDLONG)
      {
         BigInteger d = (BigInteger)value;
         if (d.doubleValue() < 0 || d.doubleValue() > 18446744073709551615D)
         {
            throw new JBossXBValueFormatException("Invalid unsignedLong value: " + value);
         }
         result = d.toString();
      }

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