Examples of java.math.BigDecimal.toBigInteger()

java.math.BigDecimal.toBigInteger()
sun.com/docs/books/jls/second_edition/html/conversions.doc.html#25363">narrowing primitive conversion from {@code double} to{@code long} as defined in the Java Language Specification: any fractional part of this {@code BigDecimal} will be discarded. Note that thisconversion can lose information about the precision of the {@code BigDecimal} value.
To have an exception thrown if the conversion is inexact (in other words if a nonzero fractional part is discarded), use the {@link #toBigIntegerExact()} method. @return this {@code BigDecimal} converted to a {@code BigInteger}.

     */
    public void testToBigIntegerNeg2() {
        String a = "-123809648392384754573567356745735.63567890295784902768787678287E+15";
        BigInteger bNumber = new BigInteger("-123809648392384754573567356745735635678902957849");
        BigDecimal aNumber = new BigDecimal(a);
        BigInteger result = aNumber.toBigInteger();
        assertTrue("incorrect value", result.equals(bNumber));
    }


    /**
     * Convert a negative BigDecimal to BigInteger

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     */
    public void testToBigIntegerNeg3() {
        String a = "-123809648392384754573567356745735.63567890295784902768787678287E+45";
        BigInteger bNumber = new BigInteger("-123809648392384754573567356745735635678902957849027687876782870000000000000000");
        BigDecimal aNumber = new BigDecimal(a);
        BigInteger result = aNumber.toBigInteger();
         assertTrue("incorrect value", result.equals(bNumber));
    }


    /**
     * Convert a small BigDecimal to BigInteger

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     */
    public void testToBigIntegerZero() {
        String a = "-123809648392384754573567356745735.63567890295784902768787678287E-500";
        BigInteger bNumber = new BigInteger("0");
        BigDecimal aNumber = new BigDecimal(a);
        BigInteger result = aNumber.toBigInteger();
        assertTrue("incorrect value", result.equals(bNumber));
    }


    /**
     * toBigIntegerExact()

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                BigDecimal bdi = rs.getBigDecimal(col);
                if (bdi == null) {
                    return runtime.getNil();
                }
                // will return either Fixnum or Bignum
                return RubyBignum.bignorm(runtime, bdi.toBigInteger());
            }
        case FLOAT:
            // Ok, the JDBC api is tricky here. getDouble() will
            // return 0 when the db value is NULL, that's why we use
            // BigDecimal and go back to a double from there

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        if (storeLargeNumbersAsStrings) {
            String str = getString(rs, column);
            return (str == null) ? null : new BigDecimal(str).toBigInteger();
        }
        BigDecimal bd = getBigDecimal(rs, column);
        return (bd == null) ? null : bd.toBigInteger();
    }


    /**
     * Convert the specified column of the SQL ResultSet to the proper
     * java type.

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        if (storeLargeNumbersAsStrings) {
            String str = getString(rs, column);
            return (str == null) ? null : new BigDecimal(str).toBigInteger();
        }
        BigDecimal bd = getBigDecimal(rs, column);
        return (bd == null) ? null : bd.toBigInteger();
    }


    /**
     * Convert the specified column of the SQL ResultSet to the proper
     * java type.

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        if (storeLargeNumbersAsStrings) {
            String str = getString(rs, column);
            return (str == null) ? null : new BigDecimal(str).toBigInteger();
        }
        BigDecimal bd = getBigDecimal(rs, column);
        return (bd == null) ? null : bd.toBigInteger();
    }


    /**
     * Convert the specified column of the SQL ResultSet to the proper
     * java type.

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                if (null != is) {
                    ack = PersistenceUtils.getInstance()
                        .deserialiseAcknowledgment(is); 
                }
                DestinationSequence seq = new DestinationSequence(sid, acksTo, 
                                                                  lm == null ? null : lm.toBigInteger(), ack);
                seqs.add(seq);                                                 
            }
        } catch (SQLException ex) {
            LOG.log(Level.WARNING, new Message("SELECT_DEST_SEQ_FAILED_MSG", LOG).toString(), ex);
        }

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        if (storeLargeNumbersAsStrings) {
            String str = getString(rs, column);
            return (str == null) ? null : new BigDecimal(str).toBigInteger();
        }
        BigDecimal bd = getBigDecimal(rs, column);
        return (bd == null) ? null : bd.toBigInteger();
    }


    /**
     * Convert the specified column of the SQL ResultSet to the proper
     * java type.

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  public void testRoundIntegralDoubleToBigInteger() {
    for (double d : INTEGRAL_DOUBLE_CANDIDATES) {
      for (RoundingMode mode : ALL_SAFE_ROUNDING_MODES) {
        BigDecimal expected = new BigDecimal(d).setScale(0, mode);
        assertEquals(expected.toBigInteger(), DoubleMath.roundToBigInteger(d, mode));
      }
    }
  }


  public void testRoundFractionalDoubleToBigInteger() {

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