Package org.postgresql.util

Class ByteConverter

java.lang.Object

org.postgresql.util.ByteConverter

public class ByteConverter
extends java.lang.Object

Helper methods to parse java base types from byte arrays.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	ByteConverter.PositiveShorts	Simple stack structure for non-negative short values.

Field Summary

Fields

Modifier and Type	Field	Description
private static java.math.BigInteger	BI_MAX_LONG
private static java.math.BigInteger[]	BI_TEN_POWERS
private static java.math.BigInteger	BI_TEN_THOUSAND
private static int[]	INT_TEN_POWERS
private static int	LONG_BYTES
private static long[]	LONG_TEN_POWERS
private static int	NUMERIC_DSCALE_MASK
private static short	NUMERIC_NAN
private static short	NUMERIC_NEG
private static short	NUMERIC_NINF
private static short	NUMERIC_PINF
private static short	NUMERIC_POS
private static int	SHORT_BYTES

Constructor Summary

Constructors

Modifier	Constructor	Description
private	ByteConverter()

Method Summary

Modifier and Type	Method	Description
static boolean	bool(byte[] bytes, int idx)	Parses a boolean value from the byte array.
static void	bool(byte[] target, int idx, boolean value)	Encodes a boolean value to the byte array.
static int	bytesToInt(byte[] bytes)	Convert a variable length array of bytes to an integer
static float	float4(byte[] bytes, int idx)	Parses a float value from the byte array.
static void	float4(byte[] target, int idx, float value)	Encodes a int value to the byte array.
static double	float8(byte[] bytes, int idx)	Parses a double value from the byte array.
static void	float8(byte[] target, int idx, double value)	Encodes a int value to the byte array.
static short	int2(byte[] bytes, int idx)	Parses a short value from the byte array.
static void	int2(byte[] target, int idx, int value)	Encodes a int value to the byte array.
static int	int4(byte[] bytes, int idx)	Parses an int value from the byte array.
static void	int4(byte[] target, int idx, int value)	Encodes a int value to the byte array.
static long	int8(byte[] bytes, int idx)	Parses a long value from the byte array.
static void	int8(byte[] target, int idx, long value)	Encodes a long value to the byte array.
static java.lang.Number	numeric(byte[] bytes)	Convert a variable length array of bytes to an integer
static java.lang.Number	numeric(byte[] bytes, int pos, int numBytes)	Convert a variable length array of bytes to a Number.
static byte[]	numeric(java.math.BigDecimal nbr)	Converts a non-null BigDecimal to binary format for Oid.NUMERIC.
private static java.math.BigInteger	tenPower(int exponent)

Methods inherited from class java.lang.Object

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

Field Detail

NUMERIC_DSCALE_MASK

private static final int NUMERIC_DSCALE_MASK

See Also:

Constant Field Values

NUMERIC_POS

private static final short NUMERIC_POS

See Also:

Constant Field Values

NUMERIC_NEG

private static final short NUMERIC_NEG

See Also:

Constant Field Values

NUMERIC_NAN

private static final short NUMERIC_NAN

See Also:

Constant Field Values

NUMERIC_PINF

private static final short NUMERIC_PINF

See Also:

Constant Field Values

NUMERIC_NINF

private static final short NUMERIC_NINF

See Also:

Constant Field Values

SHORT_BYTES

private static final int SHORT_BYTES

See Also:

Constant Field Values

LONG_BYTES

private static final int LONG_BYTES

See Also:

Constant Field Values

INT_TEN_POWERS

private static final int[] INT_TEN_POWERS

LONG_TEN_POWERS

private static final long[] LONG_TEN_POWERS

BI_TEN_POWERS

private static final java.math.BigInteger[] BI_TEN_POWERS

BI_TEN_THOUSAND

private static final java.math.BigInteger BI_TEN_THOUSAND

BI_MAX_LONG

private static final java.math.BigInteger BI_MAX_LONG

Constructor Detail

ByteConverter

private ByteConverter()

Method Detail

bytesToInt

public static int bytesToInt(byte[] bytes)

Convert a variable length array of bytes to an integer

Parameters:

bytes - array of bytes that can be decoded as an integer

Returns:

integer

numeric

public static java.lang.Number numeric(byte[] bytes)

Convert a variable length array of bytes to an integer

Parameters:

bytes - array of bytes that can be decoded as an integer

Returns:

integer

numeric

public static java.lang.Number numeric(byte[] bytes,
                                       int pos,
                                       int numBytes)

Convert a variable length array of bytes to a Number. The result will always be a BigDecimal or a special Double value.

Parameters:

bytes - array of bytes to be decoded from binary numeric representation.

pos - index of the start position of the bytes array for number

numBytes - number of bytes to use, length is already encoded in the binary format but this is used for double checking

Returns:

BigDecimal representation of numeric or one of the special double values Double.NaN, Double.NEGATIVE_INFINITY and Double.POSITIVE_INFINITY.

numeric

public static byte[] numeric(java.math.BigDecimal nbr)

Converts a non-null BigDecimal to binary format for Oid.NUMERIC.

Parameters:

nbr - The instance to represent in binary.

Returns:

The binary representation of nbr.

tenPower

private static java.math.BigInteger tenPower(int exponent)

int8

public static long int8(byte[] bytes,
                        int idx)

Parses a long value from the byte array.

Parameters:

bytes - The byte array to parse.

idx - The starting index of the parse in the byte array.

Returns:

parsed long value.

int4

public static int int4(byte[] bytes,
                       int idx)

Parses an int value from the byte array.

Parameters:

bytes - The byte array to parse.

idx - The starting index of the parse in the byte array.

Returns:

parsed int value.

int2

public static short int2(byte[] bytes,
                         int idx)

Parses a short value from the byte array.

Parameters:

bytes - The byte array to parse.

idx - The starting index of the parse in the byte array.

Returns:

parsed short value.

bool

public static boolean bool(byte[] bytes,
                           int idx)

Parses a boolean value from the byte array.

Parameters:

bytes - The byte array to parse.

idx - The starting index to read from bytes.

Returns:

parsed boolean value.

float4

public static float float4(byte[] bytes,
                           int idx)

Parses a float value from the byte array.

Parameters:

bytes - The byte array to parse.

idx - The starting index of the parse in the byte array.

Returns:

parsed float value.

float8

public static double float8(byte[] bytes,
                            int idx)

Parses a double value from the byte array.

Parameters:

bytes - The byte array to parse.

idx - The starting index of the parse in the byte array.

Returns:

parsed double value.

int8

public static void int8(byte[] target,
                        int idx,
                        long value)

Encodes a long value to the byte array.

Parameters:

target - The byte array to encode to.

idx - The starting index in the byte array.

value - The value to encode.

int4

public static void int4(byte[] target,
                        int idx,
                        int value)

Encodes a int value to the byte array.

Parameters:

target - The byte array to encode to.

idx - The starting index in the byte array.

value - The value to encode.

int2

public static void int2(byte[] target,
                        int idx,
                        int value)

Encodes a int value to the byte array.

Parameters:

target - The byte array to encode to.

idx - The starting index in the byte array.

value - The value to encode.

bool

public static void bool(byte[] target,
                        int idx,
                        boolean value)

Encodes a boolean value to the byte array.

Parameters:

target - The byte array to encode to.

idx - The starting index in the byte array.

value - The value to encode.

float4

public static void float4(byte[] target,
                          int idx,
                          float value)

Encodes a int value to the byte array.

Parameters:

target - The byte array to encode to.

idx - The starting index in the byte array.

value - The value to encode.

float8

public static void float8(byte[] target,
                          int idx,
                          double value)

Encodes a int value to the byte array.

Parameters:

target - The byte array to encode to.

idx - The starting index in the byte array.

value - The value to encode.