org.egothor.repository
Class Berkeley

java.lang.Object
  org.egothor.repository.Berkeley

All Implemented Interfaces:

DataRepository

public class Berkeley
extends java.lang.Object
implements DataRepository

Author:

Leo Galambos

Nested Class Summary

Nested classes/interfaces inherited from interface org.egothor.repository.DataRepository

DataRepository.TupleSequence

Constructor Summary

Berkeley(java.lang.String filename)

Method Summary

int	addItem(long key, byte[] d0, int l0) Adds another document into the repository.
void	close() Closes the repository.
void	destroy() Destroy the repository.
DataInputStream	elementAt(long key, int revision) Retrieves a data block.
DataRepository.TupleSequence	elements() The tuples are [long:uid;int:rev;Object:DataInputStream].
void	flush()

Methods inherited from class java.lang.Object

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

Constructor Detail

Berkeley

public Berkeley(java.lang.String filename)
         throws com.sleepycat.db.DatabaseException,
                java.io.FileNotFoundException

Throws:

com.sleepycat.db.DatabaseException

java.io.FileNotFoundException

Method Detail

close

public void close()

Description copied from interface: DataRepository

Closes the repository.

Specified by:

close in interface DataRepository

destroy

public void destroy()

Description copied from interface: DataRepository

Destroy the repository.

Specified by:

destroy in interface DataRepository

addItem

public int addItem(long key,
                   byte[] d0,
                   int l0)

Description copied from interface: DataRepository

Adds another document into the repository. If the implementation is able to recognize whether the incoming data block is still the same (as the existing in the repository), it would discard the insertion request and return 0 as the signal of no-op.

Specified by:

addItem in interface DataRepository

Returns:

revision number (0 iff unchanged) or -1 when fails

elementAt

public DataInputStream elementAt(long key,
                                 int revision)

Description copied from interface: DataRepository

Retrieves a data block.

Specified by:

elementAt in interface DataRepository

Parameters:

key - the key of the block

revision - revision number of the block, 0 is used for the latest (current) revision

Returns:

null if the revision is not available (or the key is unknown)

elements

public DataRepository.TupleSequence elements()

The tuples are [long:uid;int:rev;Object:DataInputStream].

Specified by:

elements in interface DataRepository

flush

public void flush()

Specified by:

flush in interface DataRepository