org.apache.lucene.codecs
Class MappingMultiDocsEnum

java.lang.Object
  extended by org.apache.lucene.search.DocIdSetIterator
      extended by org.apache.lucene.index.DocsEnum
          extended by org.apache.lucene.codecs.MappingMultiDocsEnum

public final class MappingMultiDocsEnum
extends DocsEnum

Exposes flex API, merged from flex API of sub-segments, remapping docIDs (this is used for segment merging).

WARNING: This API is experimental and might change in incompatible ways in the next release.

Field Summary
 
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
MappingMultiDocsEnum()
           
 
Method Summary
 int advance(int target)
          Advances to the first beyond (see NOTE below) the current whose document number is greater than or equal to target.
 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 getNumSubs()
           
 MultiDocsEnum.EnumWithSlice[] getSubs()
           
 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.
 void setMergeState(MergeState mergeState)
           
 
Methods inherited from class org.apache.lucene.index.DocsEnum
attributes
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

MappingMultiDocsEnum

public MappingMultiDocsEnum()
Method Detail

setMergeState

public void setMergeState(MergeState mergeState)

getNumSubs

public int getNumSubs()

getSubs

public MultiDocsEnum.EnumWithSlice[] getSubs()

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

docID

public int docID()
Description copied from class: DocIdSetIterator
Returns the following:

Specified by:
docID in class DocIdSetIterator

advance

public int advance(int target)
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

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


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