com.healthmarketscience.jackcess.impl

Class NullMask

java.lang.Object

com.healthmarketscience.jackcess.impl.NullMask

public class NullMask
extends Object

Bitmask that indicates whether or not each column in a row is null. Also holds values of boolean columns.

Author:

Tim McCune

Constructor Summary

Constructors

Constructor and Description
NullMask(int columnCount)

Method Summary

Modifier and Type	Method and Description
int	byteSize()
boolean	isNull(ColumnImpl column)
void	markNotNull(ColumnImpl column) Indicate that the column with the given number is not null (or a boolean value is true).
void	read(ByteBuffer buffer) Read a mask in from a buffer
void	write(ByteBuffer buffer) Write a mask to a buffer

Methods inherited from class java.lang.Object

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

Constructor Detail

NullMask

public NullMask(int columnCount)

Parameters:

columnCount - Number of columns in the row that this mask will be used for

Method Detail

read

public void read(ByteBuffer buffer)

Read a mask in from a buffer

write

public void write(ByteBuffer buffer)

Write a mask to a buffer

isNull

public boolean isNull(ColumnImpl column)

Parameters:

column - column to test for null

Returns:

Whether or not the value for that column is null. For boolean columns, returns the actual value of the column (where non-null == true)

markNotNull

public void markNotNull(ColumnImpl column)

Indicate that the column with the given number is not null (or a boolean value is true).

Parameters:

column - column to be marked non-null

byteSize

public int byteSize()

Returns:

Size in bytes of this mask