Package elki.index.tree.metrical.mtreevariants.mtree

Class MTree<O>

java.lang.Object

elki.index.tree.IndexTree<N,E>

elki.index.tree.metrical.MetricalIndexTree<O,N,E>

elki.index.tree.metrical.mtreevariants.AbstractMTree<O,MTreeNode<O>,MTreeEntry,MTreeSettings<O,MTreeNode<O>,MTreeEntry>>

elki.index.tree.metrical.mtreevariants.mtree.MTree<O>

Type Parameters:

O - the type of DatabaseObject to be stored in the metrical index

All Implemented Interfaces:

Index

Direct Known Subclasses:

MTreeIndex

@Title("M-Tree")
@Description("Efficient Access Method for Similarity Search in Metric Spaces")
@Reference(authors="P. Ciaccia, M. Patella, P. Zezula",
           title="M-tree: An Efficient Access Method for Similarity Search in Metric Spaces",
           booktitle="Proc. Int. Conf. Very Large Data Bases (VLDB\'97)",
           url="http://www.vldb.org/conf/1997/P426.PDF",
           bibkey="DBLP:conf/vldb/CiacciaPZ97")
public abstract class MTree<O>
extends AbstractMTree<O,MTreeNode<O>,MTreeEntry,MTreeSettings<O,MTreeNode<O>,MTreeEntry>>

MTree is a metrical index structure based on the concepts of the M-Tree. Apart from organizing the objects it also provides several methods to search for certain object in the structure. Persistence is not yet ensured.

Reference:

P. Ciaccia, M. Patella, P. Zezula
M-tree: An Efficient Access Method for Similarity Search in Metric Spaces
In Proc. Int. Conf. Very Large Data Bases (VLDB'97)

Since:

0.1

Author:

Elke Achtert

Nested Class Summary

Nested classes/interfaces inherited from class elki.index.tree.metrical.mtreevariants.AbstractMTree

AbstractMTree.Statistics

Field Summary

Fields

Modifier and Type	Field	Description
private static Logging	LOG	The logger for this class.

Fields inherited from class elki.index.tree.metrical.mtreevariants.AbstractMTree

settings, statistics

Fields inherited from class elki.index.tree.IndexTree

dirCapacity, dirMinimum, initialized, leafCapacity, leafMinimum

Constructor Summary

Constructors

Constructor	Description
MTree(PageFile<MTreeNode<O>> pagefile, MTreeSettings<O,MTreeNode<O>,MTreeEntry> settings)	Constructor.

Method Summary

Modifier and Type	Method	Description
protected MTreeEntry	createNewDirectoryEntry(MTreeNode<O> node, DBID routingObjectID, double parentDistance)	Creates a new directory entry representing the specified node.
protected MTreeNode<O>	createNewDirectoryNode()	Creates a new directory node with the specified capacity.
protected MTreeNode<O>	createNewLeafNode()	Creates a new leaf node with the specified capacity.
protected MTreeEntry	createRootEntry()	Creates an entry representing the root node.
protected Logging	getLogger()	Get the (STATIC) logger for this class.
protected void	preInsert(MTreeEntry entry)	Does nothing because no operations are necessary before inserting an entry.

Methods inherited from class elki.index.tree.metrical.mtreevariants.AbstractMTree

createEmptyRoot, distance, distance, doExtraIntegrityChecks, getDistance, getHeight, getLeaves, getSortedEntries, insert, insertAll, logStatistics, toString

Methods inherited from class elki.index.tree.IndexTree

createHeader, deleteNode, getFile, getNode, getNode, getPageID, getPageSize, getRootEntry, getRootID, getRootPath, initialize, initialize, initializeCapacities, initializeFromFile, isRoot, postDelete, writeNode

Methods inherited from class java.lang.Object

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

Field Detail

LOG

private static final Logging LOG

The logger for this class.

Constructor Detail

MTree

public MTree(PageFile<MTreeNode<O>> pagefile,
             MTreeSettings<O,MTreeNode<O>,MTreeEntry> settings)

Constructor.

Parameters:

pagefile - Page file

settings - Tree settings

Method Detail

preInsert

protected void preInsert(MTreeEntry entry)

Does nothing because no operations are necessary before inserting an entry.

Overrides:

preInsert in class IndexTree<MTreeNode<O>,MTreeEntry>

Parameters:

entry - the entry to be inserted

createNewDirectoryEntry

protected MTreeEntry createNewDirectoryEntry(MTreeNode<O> node,
                                             DBID routingObjectID,
                                             double parentDistance)

Description copied from class: AbstractMTree

Creates a new directory entry representing the specified node.

Specified by:

createNewDirectoryEntry in class AbstractMTree<O,MTreeNode<O>,MTreeEntry,MTreeSettings<O,MTreeNode<O>,MTreeEntry>>

Parameters:

node - the node to be represented by the new entry

routingObjectID - the id of the routing object of the node

parentDistance - the distance from the routing object of the node to the routing object of the parent node

Returns:

a new MTreeDirectoryEntry representing the specified node

createRootEntry

protected MTreeEntry createRootEntry()

Description copied from class: IndexTree

Creates an entry representing the root node.

Specified by:

createRootEntry in class IndexTree<MTreeNode<O>,MTreeEntry>

Returns:

a new MTreeDirectoryEntry by calling new MTreeDirectoryEntry(null, null, 0, null)

createNewLeafNode

protected MTreeNode<O> createNewLeafNode()

Description copied from class: IndexTree

Creates a new leaf node with the specified capacity.

Specified by:

createNewLeafNode in class IndexTree<MTreeNode<O>,MTreeEntry>

Returns:

a new MTreeNode which is a leaf node

createNewDirectoryNode

protected MTreeNode<O> createNewDirectoryNode()

Description copied from class: IndexTree

Creates a new directory node with the specified capacity.

Specified by:

createNewDirectoryNode in class IndexTree<MTreeNode<O>,MTreeEntry>

Returns:

a new MTreeNode which is a directory node

getLogger

protected Logging getLogger()

Description copied from class: IndexTree

Get the (STATIC) logger for this class.

Specified by:

getLogger in class IndexTree<MTreeNode<O>,MTreeEntry>

Returns:

the static logger