org.universAAL.context.sesame.sail.crypt
Class CryptDataStore

java.lang.Object
  org.openrdf.sail.nativerdf.datastore.DataStore
      org.universAAL.context.sesame.sail.crypt.CryptDataStore

public class CryptDataStore
extends org.openrdf.sail.nativerdf.datastore.DataStore

Class that provides indexed storage and retrieval of arbitrary length data.

Author:

Arjohn Kampman

Constructor Summary

CryptDataStore(File dataDir, String filePrefix)

CryptDataStore(File dataDir, String filePrefix, boolean forceSync)

Method Summary

void	clear() Removes all values from the DataStore.
void	close() Closes the DataStore, releasing any file references, etc.
byte[]	getData(int id) Gets the value for the specified ID.
int	getID(byte[] queryData) Gets the ID for the specified value.
int	getMaxID() Returns the maximum value-ID that is in use.
int	storeData(byte[] data) Stores the supplied value and returns the ID that has been assigned to it.
void	sync() Synchronizes any recent changes to the data to disk.

Methods inherited from class org.openrdf.sail.nativerdf.datastore.DataStore

main

Methods inherited from class java.lang.Object

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

Constructor Detail

CryptDataStore

public CryptDataStore(File dataDir,
                      String filePrefix)
               throws IOException

Throws:

IOException

CryptDataStore

public CryptDataStore(File dataDir,
                      String filePrefix,
                      boolean forceSync)
               throws IOException

Throws:

IOException

Method Detail

getData

public byte[] getData(int id)
               throws IOException

Gets the value for the specified ID.

Overrides:

getData in class org.openrdf.sail.nativerdf.datastore.DataStore

Parameters:

id - A value ID, should be larger than 0.

Returns:

The value for the ID, or null if no such value could be found.

Throws:

Exception

IOException

getID

public int getID(byte[] queryData)
          throws IOException

Gets the ID for the specified value.

Overrides:

getID in class org.openrdf.sail.nativerdf.datastore.DataStore

Parameters:

queryData - The value to get the ID for, must not be null.

Returns:

The ID for the specified value, or -1 if no such ID could be found.

Throws:

Exception

IOException

getMaxID

public int getMaxID()
             throws IOException

Returns the maximum value-ID that is in use.

Overrides:

getMaxID in class org.openrdf.sail.nativerdf.datastore.DataStore

Returns:

The largest ID, or 0 if the store does not contain any values.

Throws:

IOException - If an I/O error occurs.

storeData

public int storeData(byte[] data)
              throws IOException

Stores the supplied value and returns the ID that has been assigned to it. In case the data to store is already present, the ID of this existing data is returned.

Overrides:

storeData in class org.openrdf.sail.nativerdf.datastore.DataStore

Parameters:

data - The data to store, must not be null.

Returns:

The ID that has been assigned to the value.

Throws:

Exception

IOException

sync

public void sync()
          throws IOException

Synchronizes any recent changes to the data to disk.

Overrides:

sync in class org.openrdf.sail.nativerdf.datastore.DataStore

Throws:

IOException - If an I/O error occurred.

clear

public void clear()
           throws IOException

Removes all values from the DataStore.

Overrides:

clear in class org.openrdf.sail.nativerdf.datastore.DataStore

Throws:

IOException - If an I/O error occurred.

close

public void close()
           throws IOException

Closes the DataStore, releasing any file references, etc. In case a transaction is currently open, it will be rolled back. Once closed, the DataStore can no longer be used.

Overrides:

close in class org.openrdf.sail.nativerdf.datastore.DataStore

Throws:

IOException - If an I/O error occurred.