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java.lang.Object org.apache.lucene.search.DocIdSetIterator org.apache.lucene.search.FilteredDocIdSetIterator
public abstract class FilteredDocIdSetIterator
Abstract decorator class of a DocIdSetIterator
implementation that provides on-demand filter/validation
mechanism on an underlying DocIdSetIterator. See FilteredDocIdSet
.
Field Summary | |
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protected DocIdSetIterator |
_innerIter
|
Fields inherited from class org.apache.lucene.search.DocIdSetIterator |
---|
NO_MORE_DOCS |
Constructor Summary | |
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FilteredDocIdSetIterator(DocIdSetIterator innerIter)
Constructor. |
Method Summary | |
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int |
advance(int target)
Advances to the first beyond the current whose document number is greater than or equal to target, and returns the document number itself. |
long |
cost()
Returns the estimated cost of this DocIdSetIterator . |
int |
docID()
Returns the following: -1 or DocIdSetIterator.NO_MORE_DOCS if DocIdSetIterator.nextDoc() or
DocIdSetIterator.advance(int) were not called yet. |
protected abstract boolean |
match(int doc)
Validation method to determine whether a docid should be in the result set. |
int |
nextDoc()
Advances to the next document in the set and returns the doc it is currently on, or DocIdSetIterator.NO_MORE_DOCS if there are no more docs in the
set.NOTE: after the iterator has exhausted you should not call this method, as it may result in unpredicted behavior. |
Methods inherited from class org.apache.lucene.search.DocIdSetIterator |
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empty, slowAdvance |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected DocIdSetIterator _innerIter
Constructor Detail |
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public FilteredDocIdSetIterator(DocIdSetIterator innerIter)
innerIter
- Underlying DocIdSetIterator.Method Detail |
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protected abstract boolean match(int doc)
doc
- docid to be tested
FilteredDocIdSetIterator(DocIdSetIterator)
public int docID()
DocIdSetIterator
DocIdSetIterator.NO_MORE_DOCS
if DocIdSetIterator.nextDoc()
or
DocIdSetIterator.advance(int)
were not called yet.
DocIdSetIterator.NO_MORE_DOCS
if the iterator has exhausted.
docID
in class DocIdSetIterator
public int nextDoc() throws IOException
DocIdSetIterator
DocIdSetIterator.NO_MORE_DOCS
if there are no more docs in the
set.
nextDoc
in class DocIdSetIterator
IOException
public int advance(int target) throws IOException
DocIdSetIterator
DocIdSetIterator.NO_MORE_DOCS
if target
is greater than the highest document number in the set.
The behavior of this method is undefined when called with
target ≤ current
, or after the iterator has exhausted.
Both cases may result in unpredicted behavior.
When target > current
it behaves as if written:
int advance(int target) { int doc; while ((doc = nextDoc()) < target) { } return doc; }Some implementations are considerably more efficient than that.
NOTE: this method may be called with DocIdSetIterator.NO_MORE_DOCS
for
efficiency by some Scorers. If your implementation cannot efficiently
determine that it should exhaust, it is recommended that you check for that
value in each call to this method.
advance
in class DocIdSetIterator
IOException
public long cost()
DocIdSetIterator
DocIdSetIterator
.
This is generally an upper bound of the number of documents this iterator might match, but may be a rough heuristic, hardcoded value, or otherwise completely inaccurate.
cost
in class DocIdSetIterator
|
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