Package elki.index.tree.spatial.rstarvariants.strategies.insert

Class LeastEnlargementWithAreaInsertionStrategy

java.lang.Object

elki.index.tree.spatial.rstarvariants.strategies.insert.LeastEnlargementWithAreaInsertionStrategy

All Implemented Interfaces:

InsertionStrategy

@Reference(authors="Norbert Beckmann, Hans-Peter Kriegel, Ralf Schneider, Bernhard Seeger",
           title="The R*-tree: an efficient and robust access method for points and rectangles",
           booktitle="Proc. 1990 ACM SIGMOD Int. Conf. Management of Data",
           url="https://doi.org/10.1145/93597.98741",
           bibkey="DBLP:conf/sigmod/BeckmannKSS90")
public class LeastEnlargementWithAreaInsertionStrategy
extends java.lang.Object
implements InsertionStrategy

A slight modification of the default R-Tree insertion strategy: find rectangle with least volume enlargement, but choose least area on ties.

Proposed for non-leaf entries in:

Norbert Beckmann, Hans-Peter Kriegel, Ralf Schneider, Bernhard Seeger
The R*-tree: an efficient and robust access method for points and rectangles
Proc. 1990 ACM SIGMOD Int. Conf. Management of Data

Since:

0.5.0

Author:

Erich Schubert

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	LeastEnlargementWithAreaInsertionStrategy.Par	Parameterization class.

Field Summary

Fields

Modifier and Type	Field	Description
static LeastEnlargementWithAreaInsertionStrategy	STATIC	Static instance.

Constructor Summary

Constructors

Constructor	Description
LeastEnlargementWithAreaInsertionStrategy()	Constructor.

Method Summary

Modifier and Type	Method	Description
<A> int	choose(A options, ArrayAdapter<? extends SpatialComparable,A> getter, SpatialComparable obj, int height, int depth)	Choose insertion rectangle.

Methods inherited from class java.lang.Object

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

Field Detail

STATIC

public static final LeastEnlargementWithAreaInsertionStrategy STATIC

Static instance.

Constructor Detail

LeastEnlargementWithAreaInsertionStrategy

public LeastEnlargementWithAreaInsertionStrategy()

Constructor.

Method Detail

choose

public <A> int choose(A options,
                      ArrayAdapter<? extends SpatialComparable,A> getter,
                      SpatialComparable obj,
                      int height,
                      int depth)

Description copied from interface: InsertionStrategy

Choose insertion rectangle.

Specified by:

choose in interface InsertionStrategy

Parameters:

options - Options to choose from

getter - Array adapter for options

obj - Insertion object

height - Tree height

depth - Insertion depth (depth == height - 1 indicates leaf level)

Returns:

Subtree index in array.