org.basex.io.random

Class TableDiskAccess

java.lang.Object

org.basex.io.random.TableAccess

org.basex.io.random.TableDiskAccess

public final class TableDiskAccess
extends TableAccess

This class stores the table on disk and reads it block-wise.

Author:

BaseX Team 2005-12, BSD License, Christian Gruen, Tim Petrowsky

Constructor Summary

Constructors

Constructor and Description
TableDiskAccess(MetaData md, java.lang.String pf) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Closes the table access.
protected void	copy(byte[] entries, int pre, int last) Copies the specified values into the database.
void	delete(int pre, int nr) Deletes the specified number of entries from the database.
void	flush() Flushes the table contents.
void	insert(int pre, byte[] entries) Inserts the specified entries into the database.
int	read1(int pre, int off) Reads a byte value and returns it as an integer value.
int	read2(int pre, int off) Reads a short value and returns it as an integer value.
int	read4(int pre, int off) Reads an integer value.
long	read5(int pre, int off) Reads a 5-byte value and returns it as a long value.
void	write1(int pre, int off, int v) Writes a byte value to the specified position.
void	write2(int pre, int off, int v) Writes a short value to the specified position.
void	write4(int pre, int off, int v) Writes an integer value to the specified position.
void	write5(int pre, int off, long v) Writes a 5-byte value to the specified position.

Methods inherited from class org.basex.io.random.TableAccess

replace, set

Methods inherited from class java.lang.Object

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

Constructor Detail

TableDiskAccess

public TableDiskAccess(MetaData md,
               java.lang.String pf)
                throws java.io.IOException

Constructor.

Parameters:

md - meta data

pf - file prefix

Throws:

java.io.IOException - I/O exception

Method Detail

flush

public void flush()
           throws java.io.IOException

Description copied from class: TableAccess

Flushes the table contents.

Specified by:

flush in class TableAccess

Throws:

java.io.IOException - I/O exception

close

public void close()
           throws java.io.IOException

Description copied from class: TableAccess

Closes the table access.

Specified by:

close in class TableAccess

Throws:

java.io.IOException - I/O exception

read1

public int read1(int pre,
        int off)

Description copied from class: TableAccess

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

Specified by:

read1 in class TableAccess

Parameters:

pre - pre value

off - offset

Returns:

integer value

read2

public int read2(int pre,
        int off)

Description copied from class: TableAccess

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

Specified by:

read2 in class TableAccess

Parameters:

pre - pre value

off - offset

Returns:

integer value

read4

public int read4(int pre,
        int off)

Description copied from class: TableAccess

Reads an integer value.

Specified by:

read4 in class TableAccess

Parameters:

pre - pre value

off - offset

Returns:

integer value

read5

public long read5(int pre,
         int off)

Description copied from class: TableAccess

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

Specified by:

read5 in class TableAccess

Parameters:

pre - pre value

off - offset

Returns:

integer value

write1

public void write1(int pre,
          int off,
          int v)

Description copied from class: TableAccess

Writes a byte value to the specified position.

Specified by:

write1 in class TableAccess

Parameters:

pre - pre value

off - offset

v - value to be written

write2

public void write2(int pre,
          int off,
          int v)

Description copied from class: TableAccess

Writes a short value to the specified position.

Specified by:

write2 in class TableAccess

Parameters:

pre - pre value

off - offset

v - value to be written

write4

public void write4(int pre,
          int off,
          int v)

Description copied from class: TableAccess

Writes an integer value to the specified position.

Specified by:

write4 in class TableAccess

Parameters:

pre - pre value

off - offset

v - value to be written

write5

public void write5(int pre,
          int off,
          long v)

Description copied from class: TableAccess

Writes a 5-byte value to the specified position.

Specified by:

write5 in class TableAccess

Parameters:

pre - pre value

off - offset

v - value to be written

copy

protected void copy(byte[] entries,
        int pre,
        int last)

Description copied from class: TableAccess

Copies the specified values into the database.

Specified by:

copy in class TableAccess

Parameters:

entries - entries to copy

pre - first target pre value

last - last pre value

delete

public void delete(int pre,
          int nr)

Description copied from class: TableAccess

Deletes the specified number of entries from the database.

Specified by:

delete in class TableAccess

Parameters:

pre - pre value of the first node to delete

nr - number of entries to be deleted

insert

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

Description copied from class: TableAccess

Inserts the specified entries into the database.

Specified by:

insert in class TableAccess

Parameters:

pre - pre value

entries - array of bytes containing the entries to insert