QueryProcessor.Utils
Class SortedAccessMtree

java.lang.Object
  QueryProcessor.Utils.SortedAccess
      QueryProcessor.Utils.SortedAccessMtree

Direct Known Subclasses:

SortedAccessMtreeRoundRobin

public abstract class SortedAccessMtree
extends SortedAccess

Abstract class for the management of sorted accesses to the region M-tree.

Field Summary

Fields inherited from class QueryProcessor.Utils.SortedAccess

query, time

Constructor Summary

SortedAccessMtree(java.lang.String filename, Image query)
Basic constructor.

Method Summary

int	getDistances() Returns the number of distance computations performed by the region index.
protected SortedAccessResult	getNext(int index) Performs a sorted access on the specified region scan.
boolean	resetDistances() Resets the number of distance computations performed by the region index.

Methods inherited from class QueryProcessor.Utils.SortedAccess

getBestSortedAccess, getCount, getImage, getNext, getTime, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

SortedAccessMtree

public SortedAccessMtree(java.lang.String filename,
                         Image query)

Basic constructor.

Parameters:

filename - The absolute path of the file containing the M-tree index.

query - The query image.

Method Detail

getNext

protected SortedAccessResult getNext(int index)

Performs a sorted access on the specified region scan.

Specified by:

getNext in class SortedAccess

Parameters:

index - Index of the region scan to be accessed.

Returns:

The result of the requested region scan (null if no such region scan exists or if the requested region scan has been completed).

resetDistances

public boolean resetDistances()

Resets the number of distance computations performed by the region index.

Specified by:

resetDistances in class SortedAccess

Returns:

true if the count was successfully reset, false otherwise.

getDistances

public int getDistances()

Returns the number of distance computations performed by the region index.

Specified by:

getDistances in class SortedAccess

Returns:

Number of distance computations performed by the region index.