com.google.uzaygezen.core

Class Assessment<T,V>

java.lang.Object

com.google.uzaygezen.core.Assessment<T,V>

Type Parameters:

T - filter type

public class Assessment<T,V>
extends Object

The result of the user assessment of the spatial relationship between one spatial object and the query region. The following states are representable:

• SpatialRelation.DISJOINT with a 0 (zero) estimate means that there is no way the spatial object could overlap with points in the data set. That implies that the user doesn't care if the spatial object is filtered out or not from the final query expression, since it will not contain any points anyway.
• SpatialRelation.DISJOINT with a positive estimate means that the spatial object is disjoint with the query region, but the spatial object is estimated to contain estimate data set points. This gap size estimate is later used to decide which consecutive ranges should be joined into one contiguous range, trying to minimise the number of included points that are not useful to the user, when there is a constraint on the number of ranges of the query expression being created.
• SpatialRelation.COVERED with a non-null filter means that the spatial object's sub-space identified by the filter is fully included in the query region, or that the user doesn't want to zoom any deeper in the multidimensional space and that filtering of unneeded points can be done later, outside the space filling framework. Although the filter object is not allowed to be null, it will commonly represent a no-op filtering.
• SpatialRelation.OVERLAPS means that the spatial object overlaps, but is neither disjoint nor included in the query region, or that the user can't figure out what's the exact relationship and wants to zoom into the region.

Author:

Daniel Aioanei

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object o)
V	getEstimate()
T	getFilter()
SpatialRelation	getOutcome()
int	hashCode()
boolean	isPotentialOverSelectivity()
static <T,V> Assessment<T,V>	makeCovered(T coverFilter, boolean overSelectivityPossible, V zero)
static <T,V> Assessment<T,V>	makeDisjoint(V gapEstimate)
static <T,V> Assessment<T,V>	makeOverlaps(V zero)
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

makeDisjoint

public static <T,V> Assessment<T,V> makeDisjoint(V gapEstimate)

makeOverlaps

public static <T,V> Assessment<T,V> makeOverlaps(V zero)

makeCovered

public static <T,V> Assessment<T,V> makeCovered(T coverFilter,
                                boolean overSelectivityPossible,
                                V zero)

getOutcome

public SpatialRelation getOutcome()

getEstimate

public V getEstimate()

getFilter

public T getFilter()

isPotentialOverSelectivity

public boolean isPotentialOverSelectivity()

Returns:

is there any chance that we might have over-selected?

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object