org.basex.io
Class TableAccess

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

Direct Known Subclasses:

TableDiskAccess, TableMemAccess

public abstract class TableAccess
extends Object

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

Author:

Workgroup DBIS, University of Konstanz 2005-10, ISC License, Christian Gruen

Constructor Summary

TableAccess(MetaData md, String pf)
Constructor.

Method Summary

abstract void	close() Closes the table access.
abstract void	delete(int pre, int nr) Deletes the specified number of entries from the database.
abstract void	flush() Flushes the table contents.
abstract void	insert(int pre, byte[] entries) Inserts the specified entries into the database.
abstract int	read1(int p, int o) Reads a byte value and returns it as an integer value.
abstract int	read2(int p, int o) Reads a short value and returns it as an integer value.
abstract int	read4(int p, int o) Reads an integer value.
abstract long	read5(int p, int o) Reads a 5-byte value and returns it as a long value.
abstract void	set(int pre, byte[] entries) Copies the specified entry into the database.
abstract void	write1(int p, int o, int v) Writes a byte value to the specified position.
abstract void	write2(int p, int o, int v) Writes a short value 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(MetaData md,
                   String pf)

Constructor.

Parameters:

md - meta data

pf - file prefix

Method Detail

flush

public abstract void flush()
                    throws IOException

Flushes the table contents.

Throws:

IOException - I/O exception

close

public abstract void close()
                    throws IOException

Closes the table access.

Throws:

IOException - I/O exception

read1

public abstract int read1(int p,
                          int o)

Reads a byte value and returns it as an integer value.

Parameters:

p - pre value

o - offset

Returns:

integer value

read2

public abstract int read2(int p,
                          int o)

Reads a short value and returns it as an integer value.

Parameters:

p - pre value

o - offset

Returns:

integer value

read4

public abstract int read4(int p,
                          int o)

Reads an integer value.

Parameters:

p - pre value

o - offset

Returns:

integer value

read5

public abstract long read5(int p,
                           int o)

Reads a 5-byte value and returns it as a long value.

Parameters:

p - pre value

o - offset

Returns:

integer value

write1

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

Writes a byte value 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 a short value 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)

Deletes the specified number of entries from the database.

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)

Inserts the specified entries into the database.

Parameters:

pre - pre value

entries - array of bytes containing the entries to insert

set

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

Copies the specified entry into the database.

Parameters:

pre - pre value

entries - array of bytes containing the entries to insert