Package org.apache.lucene.search

Class XFilteredDocIdSetIterator

java.lang.Object

org.apache.lucene.search.DocIdSetIterator

org.apache.lucene.search.XFilteredDocIdSetIterator

public abstract class XFilteredDocIdSetIterator
extends org.apache.lucene.search.DocIdSetIterator

Abstract decorator class of a DocIdSetIterator implementation that provides on-demand filter/validation mechanism on an underlying DocIdSetIterator.

Field Summary

Fields

Modifier and Type	Field	Description
protected org.apache.lucene.search.DocIdSetIterator	_innerIter

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

NO_MORE_DOCS

Constructor Summary

Constructors

Constructor	Description
XFilteredDocIdSetIterator(org.apache.lucene.search.DocIdSetIterator innerIter)	Constructor.

Method Summary

Modifier and Type	Method	Description
int	advance(int target)
long	cost()
int	docID()
org.apache.lucene.search.DocIdSetIterator	getDelegate()	Return the wrapped DocIdSetIterator.
protected abstract boolean	match(int doc)	Validation method to determine whether a docid should be in the result set.
int	nextDoc()

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

all, empty, slowAdvance

Methods inherited from class java.lang.Object

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

Field Detail

_innerIter

protected org.apache.lucene.search.DocIdSetIterator _innerIter

Constructor Detail

XFilteredDocIdSetIterator

public XFilteredDocIdSetIterator(org.apache.lucene.search.DocIdSetIterator innerIter)

Constructor.

Parameters:

innerIter - Underlying DocIdSetIterator.

Method Detail

getDelegate

public org.apache.lucene.search.DocIdSetIterator getDelegate()

Return the wrapped DocIdSetIterator.

match

protected abstract boolean match(int doc)

Validation method to determine whether a docid should be in the result set.

Parameters:

doc - docid to be tested

Returns:

true if input docid should be in the result set, false otherwise.

Throws:

org.apache.lucene.search.CollectionTerminatedException - if the underlying iterator is exhausted.

See Also:

XFilteredDocIdSetIterator(DocIdSetIterator)

docID

public int docID()

Specified by:

docID in class org.apache.lucene.search.DocIdSetIterator

nextDoc

public int nextDoc()
            throws java.io.IOException

Specified by:

nextDoc in class org.apache.lucene.search.DocIdSetIterator

Throws:

java.io.IOException

advance

public int advance(int target)
            throws java.io.IOException

Specified by:

advance in class org.apache.lucene.search.DocIdSetIterator

Throws:

java.io.IOException

cost

public long cost()

Specified by:

cost in class org.apache.lucene.search.DocIdSetIterator