org.openrdf.sail.nativerdf.btree
Class AllocatedNodesList

java.lang.Object
  org.openrdf.sail.nativerdf.btree.AllocatedNodesList

public class AllocatedNodesList
extends Object

List of allocated BTree nodes, persisted to a file on disk.

Author:

Arjohn Kampman

Constructor Summary

AllocatedNodesList(File allocNodesFile, BTree btree)
Creates a new AllocatedNodelist for the specified BTree.

Method Summary

int	allocateNode()
void	clear() Clears the allocated nodes list.
boolean	delete() Deletes the allocated nodes file.
void	freeNode(int nodeID)
File	getFile() Gets the allocated nodes file.
int	getMaxNodeID() Returns the highest allocated node ID.
int	getNodeCount() Returns the number of allocated nodes.
void	sync() Writes any changes that are cached in memory to disk.

Methods inherited from class java.lang.Object

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

Constructor Detail

AllocatedNodesList

public AllocatedNodesList(File allocNodesFile,
                          BTree btree)

Creates a new AllocatedNodelist for the specified BTree.

Method Detail

getFile

public File getFile()

Gets the allocated nodes file.

delete

public boolean delete()
               throws IOException

Deletes the allocated nodes file.

Returns:

true if the file was deleted.

Throws:

IOException

sync

public void sync()
          throws IOException

Writes any changes that are cached in memory to disk.

Throws:

IOException

clear

public void clear()
           throws IOException

Clears the allocated nodes list.

Throws:

IOException - If an I/O error occurred.

allocateNode

public int allocateNode()
                 throws IOException

Throws:

IOException

freeNode

public void freeNode(int nodeID)
              throws IOException

Throws:

IOException

getMaxNodeID

public int getMaxNodeID()
                 throws IOException

Returns the highest allocated node ID.

Throws:

IOException

getNodeCount

public int getNodeCount()
                 throws IOException

Returns the number of allocated nodes.

Throws:

IOException