com.healthmarketscience.jackcess
Class NullMask

java.lang.Object
  com.healthmarketscience.jackcess.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

NullMask(int columnCount)

Method Summary

int	byteSize()
boolean	isNull(Column column)
void	markNotNull(Column 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(Column 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(Column 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