org.crosswire.jsword.book.sword
Class TreeKeyIndex

java.lang.Object
  org.crosswire.jsword.book.sword.TreeKeyIndex

All Implemented Interfaces:

Activatable

public class TreeKeyIndex
extends Object
implements Activatable

TreeKeyIndex reads Sword index files that are path based. Paths are of the form /a/b/c, and can be of any depth. The ultimate output of a TreeKeyIndex is the offset and length of a chunk of data in another file that can be read.

Author:

DM Smith

See Also:

The GNU Lesser General Public License for details.

Field Summary

private boolean	active
private SwordBookMetaData	bmd
private File	datFile
private RandomAccessFile	datRaf
private static String	EXTENSION_DATA
private static String	EXTENSION_INDEX
private File	idxFile
private RandomAccessFile	idxRaf
private static org.slf4j.Logger	log The log stream

Constructor Summary

TreeKeyIndex(SwordBookMetaData sbmd)
Simple ctor

Method Summary

void	activate(Lock lock) Called to indicate that the Book should initialize itself, and consume whatever system resources it needs to be able to respond to other queries.
protected void	checkActive() Helper method so we can quickly activate ourselves on access
void	deactivate(Lock lock) Called to indicate that the Book should release whatever system resources it can to make way for other uses.
private String	getExpandedDataPath()
TreeNode	getFirstChild(TreeNode node) Get the first child of the TreeNode.
TreeNode	getNextSibling(TreeNode node) Get the next sibling of the TreeNode.
private int	getOffset(int index) The idx file contains offsets into the dat file.
TreeNode	getParent(TreeNode node) Get the parent of the TreeNode.
TreeNode	getRoot()
private TreeNode	getTreeNode(int offset) Given an offset get the TreeNode from the dat file.

Methods inherited from class java.lang.Object

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

Field Detail

EXTENSION_INDEX

private static final String EXTENSION_INDEX

See Also:

Constant Field Values

EXTENSION_DATA

private static final String EXTENSION_DATA

See Also:

Constant Field Values

bmd

private SwordBookMetaData bmd

idxFile

private File idxFile

datFile

private File datFile

idxRaf

private RandomAccessFile idxRaf

datRaf

private RandomAccessFile datRaf

active

private boolean active

log

private static final org.slf4j.Logger log

The log stream

Constructor Detail

TreeKeyIndex

public TreeKeyIndex(SwordBookMetaData sbmd)

Simple ctor

Parameters:

sbmd -

Method Detail

getRoot

public TreeNode getRoot()
                 throws IOException

Returns:

the root TreeNode for the module.

Throws:

IOException

getParent

public TreeNode getParent(TreeNode node)
                   throws IOException

Get the parent of the TreeNode.

Parameters:

node - the node being worked upon

Returns:

the parent node

Throws:

IOException

getFirstChild

public TreeNode getFirstChild(TreeNode node)
                       throws IOException

Get the first child of the TreeNode.

Parameters:

node - the node being worked upon

Returns:

the first child node

Throws:

IOException

getNextSibling

public TreeNode getNextSibling(TreeNode node)
                        throws IOException

Get the next sibling of the TreeNode.

Parameters:

node - the node being worked upon

Returns:

the next sibling node

Throws:

IOException

getOffset

private int getOffset(int index)
               throws IOException

The idx file contains offsets into the dat file.

Parameters:

index - the record id

Returns:

an offset into the dat file

Throws:

IOException

getTreeNode

private TreeNode getTreeNode(int offset)
                      throws IOException

Given an offset get the TreeNode from the dat file.

Parameters:

offset - start of a TreeNode record in the dat file.

Returns:

the TreeNode

Throws:

IOException

activate

public final void activate(Lock lock)

Description copied from interface: Activatable

Called to indicate that the Book should initialize itself, and consume whatever system resources it needs to be able to respond to other queries.

Specified by:

activate in interface Activatable

Parameters:

lock - An attempt to ensure that only the Activator calls this method

deactivate

public final void deactivate(Lock lock)

Description copied from interface: Activatable

Called to indicate that the Book should release whatever system resources it can to make way for other uses.

Specified by:

deactivate in interface Activatable

Parameters:

lock - An attempt to ensure that only the Activator calls this method

checkActive

protected final void checkActive()

Helper method so we can quickly activate ourselves on access

getExpandedDataPath

private String getExpandedDataPath()
                            throws BookException

Throws:

BookException