Package org.apache.lucene.queries.intervals

Class IntervalFilter

java.lang.Object

org.apache.lucene.search.DocIdSetIterator

org.apache.lucene.queries.intervals.IntervalIterator

org.apache.lucene.queries.intervals.IntervalFilter

public abstract class IntervalFilter
extends IntervalIterator

Wraps an IntervalIterator and passes through those intervals that match the accept() function

Field Summary

Fields

Modifier and Type	Field	Description
protected IntervalIterator	in

Fields inherited from class org.apache.lucene.queries.intervals.IntervalIterator

NO_MORE_INTERVALS

Fields inherited from class org.apache.lucene.search.DocIdSetIterator

NO_MORE_DOCS

Constructor Summary

Constructors

Constructor	Description
IntervalFilter(IntervalIterator in)	Create a new filter

Method Summary

Modifier and Type	Method	Description
protected abstract boolean	accept()
int	advance(int target)
long	cost()
int	docID()
int	end()	The end of the current interval Returns -1 if IntervalIterator.nextInterval() has not yet been called and IntervalIterator.NO_MORE_INTERVALS once the iterator is exhausted.
int	gaps()	The number of gaps within the current interval Note that this returns the number of gaps between the immediate sub-intervals of this interval, and does not include the gaps inside those sub-intervals.
float	matchCost()	An indication of the average cost of iterating over all intervals in a document
int	nextDoc()
int	nextInterval()	Advance the iterator to the next interval
int	start()	The start of the current interval Returns -1 if IntervalIterator.nextInterval() has not yet been called and IntervalIterator.NO_MORE_INTERVALS once the iterator is exhausted.

Methods inherited from class org.apache.lucene.queries.intervals.IntervalIterator

toString, width

Methods inherited from class org.apache.lucene.search.DocIdSetIterator

all, empty, range, slowAdvance

Methods inherited from class java.lang.Object

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

Field Detail

in

protected final IntervalIterator in

Constructor Detail

IntervalFilter

public IntervalFilter(IntervalIterator in)

Create a new filter

Method Detail

docID

public int docID()

Specified by:

docID in class DocIdSetIterator

nextDoc

public int nextDoc()
            throws IOException

Specified by:

nextDoc in class DocIdSetIterator

Throws:

IOException

advance

public int advance(int target)
            throws IOException

Specified by:

advance in class DocIdSetIterator

Throws:

IOException

cost

public long cost()

Specified by:

cost in class DocIdSetIterator

start

public int start()

Description copied from class: IntervalIterator

The start of the current interval Returns -1 if IntervalIterator.nextInterval() has not yet been called and IntervalIterator.NO_MORE_INTERVALS once the iterator is exhausted.

Specified by:

start in class IntervalIterator

end

public int end()

Description copied from class: IntervalIterator

The end of the current interval Returns -1 if IntervalIterator.nextInterval() has not yet been called and IntervalIterator.NO_MORE_INTERVALS once the iterator is exhausted.

Specified by:

end in class IntervalIterator

gaps

public int gaps()

Description copied from class: IntervalIterator

The number of gaps within the current interval Note that this returns the number of gaps between the immediate sub-intervals of this interval, and does not include the gaps inside those sub-intervals. Should not be called before IntervalIterator.nextInterval(), or after it has returned IntervalIterator.NO_MORE_INTERVALS

Specified by:

gaps in class IntervalIterator

matchCost

public float matchCost()

Description copied from class: IntervalIterator

An indication of the average cost of iterating over all intervals in a document

Specified by:

matchCost in class IntervalIterator

See Also:

TwoPhaseIterator.matchCost()

accept

protected abstract boolean accept()

Returns:

true if the wrapped iterator's interval should be passed on

nextInterval

public final int nextInterval()
                       throws IOException

Description copied from class: IntervalIterator

Advance the iterator to the next interval

Specified by:

nextInterval in class IntervalIterator

Returns:

the start of the next interval, or IntervalIterator.NO_MORE_INTERVALS if there are no more intervals on the current document

Throws:

IOException