org.apache.derby.client.am
Class FloatingPoint

java.lang.Object
  org.apache.derby.client.am.FloatingPoint

public class FloatingPoint
extends java.lang.Object

Converters from floating point bytes to Java float, double, or java.math.BigDecimal.

Field Summary

static int

IEEE_754_FLOATING_POINT Supported Unix Big Endian IEEE 754 floating point representation.

Constructor Summary

private

FloatingPoint()

Method Summary

private static int	convertFromByteToInt(byte[] buffer, int offset) Convert the byte array to an int.
private static long	convertFromByteToLong(byte[] buffer, int offset) Convert the byte array to a long.
static void	doubleToIeee754Bytes(byte[] buffer, int offset, double d) Write a Java double to an 8-byte double precision floating point representation.
static void	floatToIeee754Bytes(byte[] buffer, int offset, float f) Write a Java float to a 4-byte floating point representation.
static double	getDouble(byte[] buffer, int offset) Build a Java double from an 8-byte floating point representation.
static float	getFloat(byte[] buffer, int offset) Build a Java float from a 4-byte floating point representation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

IEEE_754_FLOATING_POINT

public static final int IEEE_754_FLOATING_POINT

Supported Unix Big Endian IEEE 754 floating point representation.

See Also:

Constant Field Values

Constructor Detail

FloatingPoint

private FloatingPoint()

Method Detail

convertFromByteToInt

private static final int convertFromByteToInt(byte[] buffer,
                                              int offset)

Convert the byte array to an int.

convertFromByteToLong

private static final long convertFromByteToLong(byte[] buffer,
                                                int offset)

Convert the byte array to a long.

getFloat

public static final float getFloat(byte[] buffer,
                                   int offset)

Build a Java float from a 4-byte floating point representation.

This includes DERBY types:

• REAL
• FLOAT(1<=n<=24)

Throws:

java.lang.IllegalArgumentException - if the specified representation is not recognized.

getDouble

public static final double getDouble(byte[] buffer,
                                     int offset)

Build a Java double from an 8-byte floating point representation.

This includes DERBY types:

• FLOAT
• DOUBLE [PRECISION]

Throws:

java.lang.IllegalArgumentException - if the specified representation is not recognized.

floatToIeee754Bytes

public static final void floatToIeee754Bytes(byte[] buffer,
                                             int offset,
                                             float f)

Write a Java float to a 4-byte floating point representation.

doubleToIeee754Bytes

public static final void doubleToIeee754Bytes(byte[] buffer,
                                              int offset,
                                              double d)

Write a Java double to an 8-byte double precision floating point representation.