org.apache.lucene.index

Class FilterAtomicReader.FilterDocsEnum

java.lang.Object

org.apache.lucene.search.DocIdSetIterator

org.apache.lucene.index.DocsEnum

org.apache.lucene.index.FilterAtomicReader.FilterDocsEnum

Enclosing class:

FilterAtomicReader

public static class FilterAtomicReader.FilterDocsEnum
extends DocsEnum

Base class for filtering DocsEnum implementations.

Field Summary

Fields

Modifier and Type	Field and Description
protected DocsEnum	in

Fields inherited from class org.apache.lucene.index.DocsEnum

FLAG_FREQS

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

NO_MORE_DOCS

Constructor Summary

Constructors

Constructor and Description
FilterAtomicReader.FilterDocsEnum(DocsEnum in)

Method Summary

Methods

Modifier and Type	Method and Description
int	advance(int target) Advances to the first beyond (see NOTE below) the current whose document number is greater than or equal to target.
AttributeSource	attributes() Returns the related attributes.
int	docID() Returns the following: -1 or DocIdSetIterator.NO_MORE_DOCS if DocIdSetIterator.nextDoc() or DocIdSetIterator.advance(int) were not called yet.
int	freq() Returns term frequency in the current document.
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 java.lang.Object

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

Field Detail

in

protected final DocsEnum in

Constructor Detail

FilterAtomicReader.FilterDocsEnum

public FilterAtomicReader.FilterDocsEnum(DocsEnum in)

Method Detail

docID

public int docID()

Description copied from class: DocIdSetIterator

Returns the following:

• -1 or DocIdSetIterator.NO_MORE_DOCS if DocIdSetIterator.nextDoc() or DocIdSetIterator.advance(int) were not called yet.
• DocIdSetIterator.NO_MORE_DOCS if the iterator has exhausted.
• Otherwise it should return the doc ID it is currently on.

Specified by:

docID in class DocIdSetIterator

freq

public int freq()
         throws IOException

Description copied from class: DocsEnum

Returns term frequency in the current document. Do not call this before DocIdSetIterator.nextDoc() is first called, nor after DocIdSetIterator.nextDoc() returns NO_MORE_DOCS.

Specified by:

freq in class DocsEnum

Throws:

IOException

nextDoc

public int nextDoc()
            throws IOException

Description copied from class: DocIdSetIterator

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.

Specified by:

nextDoc in class DocIdSetIterator

Throws:

IOException

advance

public int advance(int target)
            throws IOException

Description copied from class: DocIdSetIterator

Advances to the first beyond (see NOTE below) the current whose document number is greater than or equal to target. Returns the current document number or DocIdSetIterator.NO_MORE_DOCS if there are no more docs in the set.

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: when target ≤ current implementations may opt not to advance beyond their current DocIdSetIterator.docID().

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.

NOTE: after the iterator has exhausted you should not call this method, as it may result in unpredicted behavior.

Specified by:

advance in class DocIdSetIterator

Throws:

IOException

attributes

public AttributeSource attributes()

Description copied from class: DocsEnum

Returns the related attributes.

Overrides:

attributes in class DocsEnum