com.healthmarketscience.jackcess.impl

Class CalculatedColumnUtil

java.lang.Object

com.healthmarketscience.jackcess.impl.CalculatedColumnUtil

class CalculatedColumnUtil
extends java.lang.Object

Utility code for dealing with calculated columns.

These are the currently possible calculated types: FLOAT, DOUBLE, INT, LONG, GUID, SHORT_DATE_TIME, MONEY, BOOLEAN, NUMERIC, TEXT, MEMO.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	CalculatedColumnUtil.CalcBooleanColImpl Calculated BOOLEAN column implementation.
private static class	CalculatedColumnUtil.CalcColImpl General calculated column implementation.
private static class	CalculatedColumnUtil.CalcMemoColImpl Calculated MEMO column implementation.
private static class	CalculatedColumnUtil.CalcNumericColImpl Calculated NUMERIC column implementation.
private static class	CalculatedColumnUtil.CalcTextColImpl Calculated TEXT column implementation.

Field Summary

Fields

Modifier and Type	Field and Description
private static byte[]	CALC_BOOL_FALSE
private static byte[]	CALC_BOOL_TRUE
private static int	CALC_DATA_LEN_OFFSET
private static int	CALC_DATA_OFFSET
(package private) static int	CALC_EXTRA_DATA_LEN
(package private) static short	CALC_FIXED_FIELD_LEN

Constructor Summary

Constructors

Constructor and Description
CalculatedColumnUtil()

Method Summary

Modifier and Type	Method and Description
(package private) static ColumnImpl	create(ColumnImpl.InitArgs args) Creates the appropriate ColumnImpl class for a calculated column and reads a column definition in from a buffer
private static java.nio.ByteBuffer	prepareWrappedCalcValue(int dataLen, java.nio.ByteOrder order) Prepares a calculated value buffer for data of the given length.
private static byte[]	unwrapCalculatedValue(byte[] data) Grabs the real data bytes from a calculated value.
private static byte[]	wrapCalculatedValue(byte[] data) Wraps the given data bytes with the extra calculated value data and returns a new byte[] containing the final data.
private static java.nio.ByteBuffer	wrapCalculatedValue(java.nio.ByteBuffer buffer) Wraps the given data bytes with the extra calculated value data and returns a new ByteBuffer containing the final data.

Methods inherited from class java.lang.Object

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

Field Detail

CALC_DATA_LEN_OFFSET

private static final int CALC_DATA_LEN_OFFSET

See Also:

Constant Field Values

CALC_DATA_OFFSET

private static final int CALC_DATA_OFFSET

See Also:

Constant Field Values

CALC_EXTRA_DATA_LEN

static final int CALC_EXTRA_DATA_LEN

See Also:

Constant Field Values

CALC_FIXED_FIELD_LEN

static final short CALC_FIXED_FIELD_LEN

See Also:

Constant Field Values

CALC_BOOL_TRUE

private static final byte[] CALC_BOOL_TRUE

CALC_BOOL_FALSE

private static final byte[] CALC_BOOL_FALSE

Constructor Detail

CalculatedColumnUtil

CalculatedColumnUtil()

Method Detail

create

static ColumnImpl create(ColumnImpl.InitArgs args)
                  throws java.io.IOException

Creates the appropriate ColumnImpl class for a calculated column and reads a column definition in from a buffer

Parameters:

args - column construction info

Throws:

java.io.IOException

unwrapCalculatedValue

private static byte[] unwrapCalculatedValue(byte[] data)

Grabs the real data bytes from a calculated value.

wrapCalculatedValue

private static java.nio.ByteBuffer wrapCalculatedValue(java.nio.ByteBuffer buffer)

Wraps the given data bytes with the extra calculated value data and returns a new ByteBuffer containing the final data.

wrapCalculatedValue

private static byte[] wrapCalculatedValue(byte[] data)

Wraps the given data bytes with the extra calculated value data and returns a new byte[] containing the final data.

prepareWrappedCalcValue

private static java.nio.ByteBuffer prepareWrappedCalcValue(int dataLen,
                                                           java.nio.ByteOrder order)

Prepares a calculated value buffer for data of the given length.