com.google.uzaygezen.core

Class PlainFilterCombiner<F,T extends Comparable<T>,V extends Content<V>,R extends Range<T,V>>

java.lang.Object

com.google.uzaygezen.core.PlainFilterCombiner<F,T,V,R>

All Implemented Interfaces:

FilterCombiner<F,V,R>

public class PlainFilterCombiner<F,T extends Comparable<T>,V extends Content<V>,R extends Range<T,V>>
extends Object
implements FilterCombiner<F,V,R>

Very simple filter combiner that always uses the field fixedFilter as the combined filter.

Author:

Daniel Aioanei

Constructor Summary

Constructors

Constructor and Description
PlainFilterCombiner(F filter)

Method Summary

Methods

Modifier and Type	Method and Description
SelectiveFilter<F>	combine(FilteredIndexRange<F,R> firstFilteredRange, FilteredIndexRange<F,R> secondFilteredRange, V gapEstimate) Produces a marker of potential selectivity iff at least one of the following holds: gapEstimate != 0 firstFilteredRange.isPotentialOverSelectivity() holds secondFilteredRange.isPotentialOverSelectivity() holds

Methods inherited from class java.lang.Object

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

Constructor Detail

PlainFilterCombiner

public PlainFilterCombiner(F filter)

Method Detail

combine

public SelectiveFilter<F> combine(FilteredIndexRange<F,R> firstFilteredRange,
                         FilteredIndexRange<F,R> secondFilteredRange,
                         V gapEstimate)

Produces a marker of potential selectivity iff at least one of the following holds:

• gapEstimate != 0
• firstFilteredRange.isPotentialOverSelectivity() holds
• secondFilteredRange.isPotentialOverSelectivity() holds

Specified by:

combine in interface FilterCombiner<F,V extends Content<V>,R extends Range<T,V>>

Parameters:

firstFilteredRange - the filtered index range coming before on the space filling curve

secondFilteredRange - the filtered index range coming after on the space filling curve

gapEstimate - the estimate of the number of points in the gap between the index ranges. If zero, then it is guaranteed that there are no data points in between. If non zero, it is just an estimate and its accuracy depends on the accuracy provided by the RegionInspector in use. If the two ranges are adjacent, i.e. firstFilteredRange.getIndexRange().getEnd() == secondFilteredRange.getIndexRange().getStart(), then the gap estimate is guaranteed to be zero.

Returns:

the combined filter and a bool value specifying if potential over selectivity might result by replacing the two filtered ranges with one range with the combined filter attached