net.obsearch.query
Class OBQueryFloat<O extends OBFloat>

java.lang.Object
  net.obsearch.query.AbstractOBQuery<O>
      net.obsearch.query.OBQueryFloat<O>

public final class OBQueryFloat<O extends OBFloat>
extends AbstractOBQuery<O>

Object used to store a query request.

Since:

0.7

Author:

Arnoldo Jose Muller Molina

Field Summary

protected float[]	max Maximum part of the rectangle of the query.
protected float[]	min Minimum part of the rectangle of the query.
protected OBPriorityQueueFloat<O>	result Holds the results for the query.
protected float[]	smap SMAPed vector

Constructor Summary

OBQueryFloat()
Constructor.

OBQueryFloat(O object, float range, OBPriorityQueueFloat<O> result)
Creates a new OBQueryFloat object.

OBQueryFloat(O object, float range, OBPriorityQueueFloat<O> result, float[] smap)
Creates a new OBQueryFloat object.

OBQueryFloat(O object, OBPriorityQueueFloat<O> result)

Method Summary

boolean	add(long id, O object) Adds an object into the queue.
boolean	add(long id, O obj, float d) Add the given object, object id and distance of type float to the queue.
double	approx(float[] dbin) Calculate the 1 + E or (c for Adonis et al) for approx.
boolean	collides(float[][] rectangle) Returns true if the given rectangle collides with this query.
double	compound(float[] dbin) Calculates ep without multiplying by 1/k and
double	ep(float[] dbin) Calculate the EP value for a sorted list of distances.
double	ep(List<AbstractOBResult<O>> dbin) calculates the ep value of this query against the "DB" (all the objects of the DB sorted by distance to this query).
float	getDistance()
float[]	getHigh() Return low of the query rectangle.
float[]	getLow() Return low of the query rectangle.
O	getObject()
OBPriorityQueueFloat<O>	getResult()
List<AbstractOBResult<O>>	getSortedElements()
boolean	isCandidate(float smapDistance) Returns true if we should calculate the real distance.
boolean	isFull()
float	peek() peek to the largest value if the queue is full.
double	precision(float[] dbin) Calculates the precision
double	rde(float[] dbin)
double	recall(List<AbstractOBResult<O>> perfectQuery) calculates the recall value of this query against the "DB" (all the objects of the DB sorted by distance to this query).
void	setResult(OBPriorityQueueFloat<O> result) Set the results of the matching to a new object.
double	tDR(float[] dbin) Total distance ratio
boolean	updatedRange(float originalRange) Returns true if the originalRange has been modified.

Methods inherited from class java.lang.Object

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

Field Detail

result

protected OBPriorityQueueFloat<O extends OBFloat> result

Holds the results for the query.

min

protected float[] min

Minimum part of the rectangle of the query.

max

protected float[] max

Maximum part of the rectangle of the query.

smap

protected float[] smap

SMAPed vector

Constructor Detail

OBQueryFloat

public OBQueryFloat()

Constructor.

OBQueryFloat

public OBQueryFloat(O object,
                    float range,
                    OBPriorityQueueFloat<O> result)

Creates a new OBQueryFloat object.

Parameters:

object - The object that will be matched.

range - The range to be used for the match.

result - The priority queue were the results will be stored.

OBQueryFloat

public OBQueryFloat(O object,
                    OBPriorityQueueFloat<O> result)

OBQueryFloat

public OBQueryFloat(O object,
                    float range,
                    OBPriorityQueueFloat<O> result,
                    float[] smap)

Creates a new OBQueryFloat object.

Parameters:

object - The object that will be matched.

range - The range to be used for the match.

result - The priority queue were the results will be stored.

smap - SMAP vector representation of the given object.

Method Detail

getObject

public O getObject()

collides

public boolean collides(float[][] rectangle)

Returns true if the given rectangle collides with this query.

Parameters:

rectangle - The rectangle to search.

getLow

public float[] getLow()

Return low of the query rectangle.

getHigh

public float[] getHigh()

Return low of the query rectangle.

getResult

public OBPriorityQueueFloat<O> getResult()

Returns:

The current results of the matching.

setResult

public void setResult(OBPriorityQueueFloat<O> result)

Set the results of the matching to a new object.

Parameters:

result - The new result.

isCandidate

public boolean isCandidate(float smapDistance)

Returns true if we should calculate the real distance.

Parameters:

smapDistance - The lower-resolution distance calculated with SMAP.

add

public boolean add(long id,
                   O object)
            throws InstantiationException,
                   IllegalAccessException,
                   OBException

Description copied from class: AbstractOBQuery

Adds an object into the queue. The underlying classes calculate the distance of the object and the query.

Specified by:

add in class AbstractOBQuery<O extends OBFloat>

Parameters:

id - id number of the object to add.

object - object added.

Returns:

true if the range has changed after the add.

Throws:

InstantiationException

IllegalAccessException

OBException

getDistance

public float getDistance()

getSortedElements

public List<AbstractOBResult<O>> getSortedElements()

Specified by:

getSortedElements in class AbstractOBQuery<O extends OBFloat>

Returns:

a list of objects ordered from smallest distance to largest distance

add

public boolean add(long id,
                   O obj,
                   float d)
            throws InstantiationException,
                   IllegalAccessException

Add the given object, object id and distance of type float to the queue. Updates the range of the query as needed if the range shrinks after this insertion.

Parameters:

id - The id of the object to be used

obj - The object to be added

d - The distance to be added

Throws:

IllegalAccessException - If there is a problem when instantiating objects O

InstantiationException - If there is a problem when instantiating objects O

updatedRange

public boolean updatedRange(float originalRange)

Returns true if the originalRange has been modified.

Returns:

true If the current range (getDistance()) is different than originalRange.

isFull

public boolean isFull()

Specified by:

isFull in class AbstractOBQuery<O extends OBFloat>

Returns:

true if the underlying priority queue's size is equal to k

recall

public double recall(List<AbstractOBResult<O>> perfectQuery)

Description copied from class: AbstractOBQuery

calculates the recall value of this query against the "DB" (all the objects of the DB sorted by distance to this query).

Specified by:

recall in class AbstractOBQuery<O extends OBFloat>

Parameters:

perfectQuery - all the objects of the DB sorted by distance to this query

Returns:

ep value

ep

public double ep(List<AbstractOBResult<O>> dbin)

Description copied from class: AbstractOBQuery

calculates the ep value of this query against the "DB" (all the objects of the DB sorted by distance to this query).

Specified by:

ep in class AbstractOBQuery<O extends OBFloat>

Parameters:

dbin - all the objects of the DB sorted by distance to this query

Returns:

ep value

ep

public double ep(float[] dbin)

Calculate the EP value for a sorted list of distances.

approx

public double approx(float[] dbin)
              throws OBException

Calculate the 1 + E or (c for Adonis et al) for approx. nearest neighbor This is the approximation and "real" is the real result.

Parameters:

q -

Returns:

Throws:

RAException

OBException

compound

public double compound(float[] dbin)

Calculates ep without multiplying by 1/k and

rde

public double rde(float[] dbin)

tDR

public double tDR(float[] dbin)

Total distance ratio

precision

public double precision(float[] dbin)

Calculates the precision

peek

public float peek()
           throws OBException

peek to the largest value if the queue is full.

Throws:

OBException