de.lmu.ifi.dbs.elki.index.tree.spatial.rstarvariants.strategies.insert

Class LeastEnlargementWithAreaInsertionStrategy

java.lang.Object

de.lmu.ifi.dbs.elki.index.tree.spatial.rstarvariants.strategies.insert.LeastEnlargementWithAreaInsertionStrategy

All Implemented Interfaces:

InsertionStrategy, InspectionUtilFrequentlyScanned, Parameterizable

@Reference(authors="N. Beckmann, H.-P. Kriegel, R. Schneider, B. Seeger",
           title="The R*-tree: an efficient and robust access method for points and rectangles",
           booktitle="Proceedings of the 1990 ACM SIGMOD International Conference on Management of Data, Atlantic City, NJ, May 23-25, 1990",
           url="http://dx.doi.org/10.1145/93597.98741")
public class LeastEnlargementWithAreaInsertionStrategy
extends 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:

N. Beckmann, H.-P. Kriegel, R. Schneider, B. Seeger:
The R*-tree: an efficient and robust access method for points and rectangles
in: Proceedings of the 1990 ACM SIGMOD International Conference on Management of Data, Atlantic City, NJ, May 23-25, 1990

Nested Class Summary

Nested Classes

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

Field Summary

Fields

Modifier and Type	Field and Description
static LeastEnlargementWithAreaInsertionStrategy	STATIC Static instance.

Constructor Summary

Constructors

Constructor and Description
LeastEnlargementWithAreaInsertionStrategy() Constructor.

Method Summary

Methods

Modifier and Type	Method and 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.