Class DocValuesLeafReader
- java.lang.Object
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- org.apache.lucene.index.IndexReader
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- org.apache.lucene.index.LeafReader
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- org.apache.lucene.index.DocValuesLeafReader
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- All Implemented Interfaces:
java.io.Closeable
,java.lang.AutoCloseable
abstract class DocValuesLeafReader extends LeafReader
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Nested Class Summary
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Nested classes/interfaces inherited from class org.apache.lucene.index.IndexReader
IndexReader.CacheHelper, IndexReader.CacheKey, IndexReader.ClosedListener
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Constructor Summary
Constructors Constructor Description DocValuesLeafReader()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
checkIntegrity()
Checks consistency of this reader.protected void
doClose()
Implements close.void
document(int docID, StoredFieldVisitor visitor)
Expert: visits the fields of a stored document, for custom processing/loading of each field.IndexReader.CacheHelper
getCoreCacheHelper()
Optional method: Return aIndexReader.CacheHelper
that can be used to cache based on the content of this leaf regardless of deletions.Bits
getLiveDocs()
Returns theBits
representing live (not deleted) docs.LeafMetaData
getMetaData()
Return metadata about this leaf.NumericDocValues
getNormValues(java.lang.String field)
ReturnsNumericDocValues
representing norms for this field, or null if noNumericDocValues
were indexed.PointValues
getPointValues(java.lang.String field)
Returns thePointValues
used for numeric or spatial searches for the given field, or null if there are no point fields.IndexReader.CacheHelper
getReaderCacheHelper()
Optional method: Return aIndexReader.CacheHelper
that can be used to cache based on the content of this reader.Fields
getTermVectors(int docID)
Retrieve term vectors for this document, or null if term vectors were not indexed.VectorValues
getVectorValues(java.lang.String field)
ReturnsVectorValues
for this field, or null if noVectorValues
were indexed.int
maxDoc()
Returns one greater than the largest possible document number.int
numDocs()
Returns the number of documents in this index.TopDocs
searchNearestVectors(java.lang.String field, float[] target, int k, Bits acceptDocs, int visitedLimit)
Return the k nearest neighbor documents as determined by comparison of their vector values for this field, to the given vector, by the field's similarity function.Terms
terms(java.lang.String field)
Returns theTerms
index for this field, or null if it has none.-
Methods inherited from class org.apache.lucene.index.LeafReader
docFreq, getBinaryDocValues, getContext, getDocCount, getFieldInfos, getNumericDocValues, getSortedDocValues, getSortedNumericDocValues, getSortedSetDocValues, getSumDocFreq, getSumTotalTermFreq, postings, postings, totalTermFreq
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Methods inherited from class org.apache.lucene.index.IndexReader
close, decRef, document, document, ensureOpen, equals, getRefCount, getTermVector, hasDeletions, hashCode, incRef, leaves, notifyReaderClosedListeners, numDeletedDocs, registerParentReader, tryIncRef
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Method Detail
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getCoreCacheHelper
public final IndexReader.CacheHelper getCoreCacheHelper()
Description copied from class:LeafReader
Optional method: Return aIndexReader.CacheHelper
that can be used to cache based on the content of this leaf regardless of deletions. Two readers that have the same data but different sets of deleted documents or doc values updates may be considered equal. Consider usingIndexReader.getReaderCacheHelper()
if you need deletions or dv updates to be taken into account.A return value of
null
indicates that this reader is not suited for caching, which is typically the case for short-lived wrappers that alter the content of the wrapped leaf reader.- Specified by:
getCoreCacheHelper
in classLeafReader
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terms
public final Terms terms(java.lang.String field) throws java.io.IOException
Description copied from class:LeafReader
Returns theTerms
index for this field, or null if it has none.- Specified by:
terms
in classLeafReader
- Throws:
java.io.IOException
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getNormValues
public final NumericDocValues getNormValues(java.lang.String field) throws java.io.IOException
Description copied from class:LeafReader
ReturnsNumericDocValues
representing norms for this field, or null if noNumericDocValues
were indexed. The returned instance should only be used by a single thread.- Specified by:
getNormValues
in classLeafReader
- Throws:
java.io.IOException
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getLiveDocs
public final Bits getLiveDocs()
Description copied from class:LeafReader
Returns theBits
representing live (not deleted) docs. A set bit indicates the doc ID has not been deleted. If this method returns null it means there are no deleted documents (all documents are live).The returned instance has been safely published for use by multiple threads without additional synchronization.
- Specified by:
getLiveDocs
in classLeafReader
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getPointValues
public final PointValues getPointValues(java.lang.String field) throws java.io.IOException
Description copied from class:LeafReader
Returns thePointValues
used for numeric or spatial searches for the given field, or null if there are no point fields.- Specified by:
getPointValues
in classLeafReader
- Throws:
java.io.IOException
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getVectorValues
public final VectorValues getVectorValues(java.lang.String field) throws java.io.IOException
Description copied from class:LeafReader
ReturnsVectorValues
for this field, or null if noVectorValues
were indexed. The returned instance should only be used by a single thread.- Specified by:
getVectorValues
in classLeafReader
- Throws:
java.io.IOException
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searchNearestVectors
public TopDocs searchNearestVectors(java.lang.String field, float[] target, int k, Bits acceptDocs, int visitedLimit) throws java.io.IOException
Description copied from class:LeafReader
Return the k nearest neighbor documents as determined by comparison of their vector values for this field, to the given vector, by the field's similarity function. The score of each document is derived from the vector similarity in a way that ensures scores are positive and that a larger score corresponds to a higher ranking.The search is allowed to be approximate, meaning the results are not guaranteed to be the true k closest neighbors. For large values of k (for example when k is close to the total number of documents), the search may also retrieve fewer than k documents.
The returned
TopDocs
will contain aScoreDoc
for each nearest neighbor, sorted in order of their similarity to the query vector (decreasing scores). TheTotalHits
contains the number of documents visited during the search. If the search stopped early because it hitvisitedLimit
, it is indicated through the relationTotalHits.Relation.GREATER_THAN_OR_EQUAL_TO
.- Specified by:
searchNearestVectors
in classLeafReader
- Parameters:
field
- the vector field to searchtarget
- the vector-valued queryk
- the number of docs to returnacceptDocs
-Bits
that represents the allowed documents to match, ornull
if they are all allowed to match.visitedLimit
- the maximum number of nodes that the search is allowed to visit- Returns:
- the k nearest neighbor documents, along with their (searchStrategy-specific) scores.
- Throws:
java.io.IOException
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checkIntegrity
public final void checkIntegrity() throws java.io.IOException
Description copied from class:LeafReader
Checks consistency of this reader.Note that this may be costly in terms of I/O, e.g. may involve computing a checksum value against large data files.
- Specified by:
checkIntegrity
in classLeafReader
- Throws:
java.io.IOException
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getMetaData
public final LeafMetaData getMetaData()
Description copied from class:LeafReader
Return metadata about this leaf.- Specified by:
getMetaData
in classLeafReader
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getTermVectors
public final Fields getTermVectors(int docID) throws java.io.IOException
Description copied from class:IndexReader
Retrieve term vectors for this document, or null if term vectors were not indexed. The returned Fields instance acts like a single-document inverted index (the docID will be 0).- Specified by:
getTermVectors
in classIndexReader
- Throws:
java.io.IOException
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numDocs
public final int numDocs()
Description copied from class:IndexReader
Returns the number of documents in this index.NOTE: This operation may run in O(maxDoc). Implementations that can't return this number in constant-time should cache it.
- Specified by:
numDocs
in classIndexReader
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maxDoc
public final int maxDoc()
Description copied from class:IndexReader
Returns one greater than the largest possible document number. This may be used to, e.g., determine how big to allocate an array which will have an element for every document number in an index.- Specified by:
maxDoc
in classIndexReader
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document
public final void document(int docID, StoredFieldVisitor visitor) throws java.io.IOException
Description copied from class:IndexReader
Expert: visits the fields of a stored document, for custom processing/loading of each field. If you simply want to load all fields, useIndexReader.document(int)
. If you want to load a subset, useDocumentStoredFieldVisitor
.- Specified by:
document
in classIndexReader
- Throws:
java.io.IOException
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doClose
protected final void doClose() throws java.io.IOException
Description copied from class:IndexReader
Implements close.- Specified by:
doClose
in classIndexReader
- Throws:
java.io.IOException
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getReaderCacheHelper
public final IndexReader.CacheHelper getReaderCacheHelper()
Description copied from class:IndexReader
Optional method: Return aIndexReader.CacheHelper
that can be used to cache based on the content of this reader. Two readers that have different data or different sets of deleted documents will be considered different.A return value of
null
indicates that this reader is not suited for caching, which is typically the case for short-lived wrappers that alter the content of the wrapped reader.- Specified by:
getReaderCacheHelper
in classIndexReader
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