org.basex.io
Class TableAccess

java.lang.Object
  org.basex.io.TableAccess

Direct Known Subclasses:

TableDiskAccess, TableMemAccess

public abstract class TableAccess
extends java.lang.Object

This abstract class defines the methods for accessing the database table representation.

Author:

Workgroup DBIS, University of Konstanz 2005-08, ISC License, Christian Gruen

Constructor Summary

TableAccess()

Method Summary

abstract void	close() Closes the table access.
abstract void	delete(int pre, int nr) Delete a range of entries.
abstract void	flush() Flushes the table contents.
abstract void	insert(int pre, byte[] entries) Insert entries.
abstract int	read1(int p, int o) Reads a byte from the specified position and returns it as integer.
abstract int	read2(int p, int o) Reads a short value from the specified position and returns it as integer.
abstract int	read4(int p, int o) Reads an integer value from the specified position.
abstract long	read5(int p, int o) Reads an integer value from the specified position.
abstract void	write1(int p, int o, int v) Writes a byte to the specified position.
abstract void	write2(int p, int o, int v) Writes 2 bytes to the specified position.
abstract void	write4(int p, int o, int v) Writes an integer value to the specified position.
abstract void	write5(int p, int o, long v) Writes a 5-byte value to the specified position.

Methods inherited from class java.lang.Object

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

Constructor Detail

TableAccess

public TableAccess()

Method Detail

read1

public abstract int read1(int p,
                          int o)

Reads a byte from the specified position and returns it as integer.

Parameters:

p - pre value

o - offset

Returns:

integer value

read2

public abstract int read2(int p,
                          int o)

Reads a short value from the specified position and returns it as integer.

Parameters:

p - pre value

o - offset

Returns:

integer value

read4

public abstract int read4(int p,
                          int o)

Reads an integer value from the specified position.

Parameters:

p - pre value

o - offset

Returns:

integer value

read5

public abstract long read5(int p,
                           int o)

Reads an integer value from the specified position.

Parameters:

p - pre value

o - offset

Returns:

integer value

write1

public abstract void write1(int p,
                            int o,
                            int v)

Writes a byte to the specified position.

Parameters:

p - pre value

o - offset

v - value to be written

write2

public abstract void write2(int p,
                            int o,
                            int v)

Writes 2 bytes to the specified position.

Parameters:

p - pre value

o - offset

v - value to be written

write4

public abstract void write4(int p,
                            int o,
                            int v)

Writes an integer value to the specified position.

Parameters:

p - pre value

o - offset

v - value to be written

write5

public abstract void write5(int p,
                            int o,
                            long v)

Writes a 5-byte value to the specified position.

Parameters:

p - pre value

o - offset

v - value to be written

delete

public abstract void delete(int pre,
                            int nr)

Delete a range of entries.

Parameters:

pre - pre value of the first node to delete

nr - number of entries to be deleted

insert

public abstract void insert(int pre,
                            byte[] entries)

Insert entries.

Parameters:

pre - pre value of node to insert after

entries - array of bytes containing the entries to insert

flush

public abstract void flush()
                    throws java.io.IOException

Flushes the table contents.

Throws:

java.io.IOException - in case of write errors

close

public abstract void close()
                    throws java.io.IOException

Closes the table access.

Throws:

java.io.IOException - in case of write errors