org.apache.solr.index

Class SlowCompositeReaderWrapper

java.lang.Object

org.apache.lucene.index.IndexReader

org.apache.lucene.index.LeafReader

org.apache.solr.index.SlowCompositeReaderWrapper

All Implemented Interfaces:

Closeable, AutoCloseable

public final class SlowCompositeReaderWrapper
extends LeafReader

This class forces a composite reader (eg a MultiReader or DirectoryReader) to emulate a LeafReader. This requires implementing the postings APIs on-the-fly, using the static methods in MultiTerms, MultiDocValues, by stepping through the sub-readers to merge fields/terms, appending docs, etc.

NOTE: this class almost always results in a performance hit. If this is important to your use case, you'll get better performance by gathering the sub readers using IndexReader.getContext() to get the leaves and then operate per-LeafReader, instead of using this class.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.index.IndexReader

IndexReader.CacheHelper, IndexReader.CacheKey, IndexReader.ClosedListener

Method Summary

Modifier and Type	Method and Description
void	checkIntegrity()
protected void	doClose()
void	document(int docID, StoredFieldVisitor visitor)
BinaryDocValues	getBinaryDocValues(String field)
IndexReader.CacheHelper	getCoreCacheHelper()
FieldInfos	getFieldInfos()
Bits	getLiveDocs()
LeafMetaData	getMetaData()
NumericDocValues	getNormValues(String field)
NumericDocValues	getNumericDocValues(String field)
PointValues	getPointValues(String field)
IndexReader.CacheHelper	getReaderCacheHelper()
SortedDocValues	getSortedDocValues(String field)
SortedNumericDocValues	getSortedNumericDocValues(String field)
SortedSetDocValues	getSortedSetDocValues(String field)
Fields	getTermVectors(int docID)
int	maxDoc()
int	numDocs()
Terms	terms(String field)
String	toString()
static LeafReader	wrap(IndexReader reader) This method is sugar for getting an LeafReader from an IndexReader of any kind.

Methods inherited from class org.apache.lucene.index.LeafReader

docFreq, getContext, getDocCount, getSumDocFreq, getSumTotalTermFreq, postings, postings, totalTermFreq

Methods inherited from class org.apache.lucene.index.IndexReader

close, decRef, document, document, ensureOpen, equals, getRefCount, getTermVector, hasDeletions, hashCode, incRef, leaves, numDeletedDocs, registerParentReader, tryIncRef

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

wrap

public static LeafReader wrap(IndexReader reader)
                       throws IOException

This method is sugar for getting an LeafReader from an IndexReader of any kind. If the reader is already atomic, it is returned unchanged, otherwise wrapped by this class.

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object

getReaderCacheHelper

public IndexReader.CacheHelper getReaderCacheHelper()

Specified by:

getReaderCacheHelper in class IndexReader

getCoreCacheHelper

public IndexReader.CacheHelper getCoreCacheHelper()

Specified by:

getCoreCacheHelper in class LeafReader

terms

public Terms terms(String field)
            throws IOException

Specified by:

terms in class LeafReader

Throws:

IOException

getNumericDocValues

public NumericDocValues getNumericDocValues(String field)
                                     throws IOException

Specified by:

getNumericDocValues in class LeafReader

Throws:

IOException

getBinaryDocValues

public BinaryDocValues getBinaryDocValues(String field)
                                   throws IOException

Specified by:

getBinaryDocValues in class LeafReader

Throws:

IOException

getSortedNumericDocValues

public SortedNumericDocValues getSortedNumericDocValues(String field)
                                                 throws IOException

Specified by:

getSortedNumericDocValues in class LeafReader

Throws:

IOException

getSortedDocValues

public SortedDocValues getSortedDocValues(String field)
                                   throws IOException

Specified by:

getSortedDocValues in class LeafReader

Throws:

IOException

getSortedSetDocValues

public SortedSetDocValues getSortedSetDocValues(String field)
                                         throws IOException

Specified by:

getSortedSetDocValues in class LeafReader

Throws:

IOException

getNormValues

public NumericDocValues getNormValues(String field)
                               throws IOException

Specified by:

getNormValues in class LeafReader

Throws:

IOException

getTermVectors

public Fields getTermVectors(int docID)
                      throws IOException

Specified by:

getTermVectors in class IndexReader

Throws:

IOException

numDocs

public int numDocs()

Specified by:

numDocs in class IndexReader

maxDoc

public int maxDoc()

Specified by:

maxDoc in class IndexReader

document

public void document(int docID,
                     StoredFieldVisitor visitor)
              throws IOException

Specified by:

document in class IndexReader

Throws:

IOException

getLiveDocs

public Bits getLiveDocs()

Specified by:

getLiveDocs in class LeafReader

getPointValues

public PointValues getPointValues(String field)

Specified by:

getPointValues in class LeafReader

getFieldInfos

public FieldInfos getFieldInfos()

Specified by:

getFieldInfos in class LeafReader

doClose

protected void doClose()
                throws IOException

Specified by:

doClose in class IndexReader

Throws:

IOException

checkIntegrity

public void checkIntegrity()
                    throws IOException

Specified by:

checkIntegrity in class LeafReader

Throws:

IOException

getMetaData

public LeafMetaData getMetaData()

Specified by:

getMetaData in class LeafReader