org.apache.lucene.store.instantiated

Class InstantiatedIndexReader

java.lang.Object

org.apache.lucene.index.IndexReader

org.apache.lucene.store.instantiated.InstantiatedIndexReader

public class InstantiatedIndexReader
extends IndexReader

An InstantiatedIndexReader is not a snapshot in time, it is completely in sync with the latest commit to the store!

Consider using InstantiatedIndex as if it was immutable.

Nested Class Summary

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

IndexReader.FieldOption

Field Summary

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

hasChanges

Constructor Summary

Constructors

Constructor and Description
InstantiatedIndexReader(InstantiatedIndex index)

Method Summary

Methods

Modifier and Type	Method and Description
Directory	directory()
int	docFreq(Term t)
protected void	doClose()
protected void	doCommit()
Document	document(int n) Returns the stored fields of the nth Document in this index.
Document	document(int n, FieldSelector fieldSelector) Return the Document at the nth position.
protected void	doDelete(int docNum)
protected void	doSetNorm(int doc, String field, byte value)
protected void	doUndeleteAll()
Collection	getFieldNames(IndexReader.FieldOption fieldOption)
InstantiatedIndex	getIndex()
TermFreqVector	getTermFreqVector(int docNumber, String field)
void	getTermFreqVector(int docNumber, String field, TermVectorMapper mapper)
void	getTermFreqVector(int docNumber, TermVectorMapper mapper)
TermFreqVector[]	getTermFreqVectors(int docNumber)
long	getVersion() An InstantiatedIndexReader is not a snapshot in time, it is completely in sync with the latest commit to the store!
boolean	hasDeletions()
boolean	isCurrent() An InstantiatedIndexReader is always current! Check whether this IndexReader is still using the current (i.e., most recently committed) version of the index.
boolean	isDeleted(int n)
boolean	isOptimized()
int	maxDoc()
byte[]	norms(String field) never ever touch these values.
void	norms(String field, byte[] bytes, int offset)
int	numDocs()
TermDocs	termDocs()
TermPositions	termPositions()
TermEnum	terms()
TermEnum	terms(Term t)

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

acquireWriteLock, close, commit, decRef, deleteDocument, deleteDocuments, ensureOpen, flush, getCurrentVersion, getCurrentVersion, getCurrentVersion, getIndexCommit, getTermInfosIndexDivisor, hasNorms, incRef, indexExists, indexExists, indexExists, isLocked, isLocked, lastModified, lastModified, lastModified, listCommits, main, numDeletedDocs, open, open, open, open, open, open, open, open, open, reopen, setNorm, setNorm, setTermInfosIndexDivisor, termDocs, termPositions, undeleteAll, unlock

Methods inherited from class java.lang.Object

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

Constructor Detail

InstantiatedIndexReader

public InstantiatedIndexReader(InstantiatedIndex index)

Method Detail

isOptimized

public boolean isOptimized()

Overrides:

isOptimized in class IndexReader

Returns:

always true.

getVersion

public long getVersion()

An InstantiatedIndexReader is not a snapshot in time, it is completely in sync with the latest commit to the store!

Overrides:

getVersion in class IndexReader

Returns:

output from InstantiatedIndex.getVersion() in associated instantiated index.

directory

public Directory directory()

Overrides:

directory in class IndexReader

isCurrent

public boolean isCurrent()
                  throws IOException

An InstantiatedIndexReader is always current! Check whether this IndexReader is still using the current (i.e., most recently committed) version of the index. If a writer has committed any changes to the index since this reader was opened, this will return false, in which case you must open a new IndexReader in order to see the changes. See the description of the autoCommit flag which controls when the IndexWriter actually commits changes to the index.

Overrides:

isCurrent in class IndexReader

Returns:

always true

Throws:

CorruptIndexException - if the index is corrupt

IOException - if there is a low-level IO error

UnsupportedOperationException - unless overridden in subclass

getIndex

public InstantiatedIndex getIndex()

numDocs

public int numDocs()

Specified by:

numDocs in class IndexReader

maxDoc

public int maxDoc()

Specified by:

maxDoc in class IndexReader

isDeleted

public boolean isDeleted(int n)

Specified by:

isDeleted in class IndexReader

hasDeletions

public boolean hasDeletions()

Specified by:

hasDeletions in class IndexReader

doDelete

protected void doDelete(int docNum)
                 throws IOException

Specified by:

doDelete in class IndexReader

Throws:

IOException

doUndeleteAll

protected void doUndeleteAll()
                      throws IOException

Specified by:

doUndeleteAll in class IndexReader

Throws:

IOException

doCommit

protected void doCommit()
                 throws IOException

Specified by:

doCommit in class IndexReader

Throws:

IOException

doClose

protected void doClose()
                throws IOException

Specified by:

doClose in class IndexReader

Throws:

IOException

getFieldNames

public Collection getFieldNames(IndexReader.FieldOption fieldOption)

Specified by:

getFieldNames in class IndexReader

document

public Document document(int n,
                FieldSelector fieldSelector)
                  throws CorruptIndexException,
                         IOException

Return the Document at the n^th position.

Warning! The resulting document is the actual stored document instance and not a deserialized clone as retuned by an IndexReader over a Directory. I.e., if you need to touch the document, clone it first!

This can also be seen as a feature for live canges of stored values, but be carful! Adding a field with an name unknown to the index or to a field with previously no stored values will make getFieldNames(org.apache.lucene.index.IndexReader.FieldOption) out of sync, causing problems for instance when merging the instantiated index to another index.

This implementation ignores the field selector! All stored fields are always returned!

Specified by:

document in class IndexReader

Parameters:

n - document number

fieldSelector - ignored

Returns:

The stored fields of the Document at the nth position

Throws:

CorruptIndexException - if the index is corrupt

IOException - if there is a low-level IO error

See Also:

Fieldable, FieldSelector, SetBasedFieldSelector, LoadFirstFieldSelector

document

public Document document(int n)
                  throws IOException

Returns the stored fields of the n^th Document in this index.

Warning! The resulting document is the actual stored document instance and not a deserialized clone as retuned by an IndexReader over a Directory. I.e., if you need to touch the document, clone it first!

This can also be seen as a feature for live canges of stored values, but be carful! Adding a field with an name unknown to the index or to a field with previously no stored values will make getFieldNames(org.apache.lucene.index.IndexReader.FieldOption) out of sync, causing problems for instance when merging the instantiated index to another index.

Overrides:

document in class IndexReader

Throws:

CorruptIndexException - if the index is corrupt

IOException - if there is a low-level IO error

norms

public byte[] norms(String field)
             throws IOException

never ever touch these values. it is the true values, unless norms have been touched.

Specified by:

norms in class IndexReader

Throws:

IOException

norms

public void norms(String field,
         byte[] bytes,
         int offset)
           throws IOException

Specified by:

norms in class IndexReader

Throws:

IOException

doSetNorm

protected void doSetNorm(int doc,
             String field,
             byte value)
                  throws IOException

Specified by:

doSetNorm in class IndexReader

Throws:

IOException

docFreq

public int docFreq(Term t)
            throws IOException

Specified by:

docFreq in class IndexReader

Throws:

IOException

terms

public TermEnum terms()
               throws IOException

Specified by:

terms in class IndexReader

Throws:

IOException

terms

public TermEnum terms(Term t)
               throws IOException

Specified by:

terms in class IndexReader

Throws:

IOException

termDocs

public TermDocs termDocs()
                  throws IOException

Specified by:

termDocs in class IndexReader

Throws:

IOException

termPositions

public TermPositions termPositions()
                            throws IOException

Specified by:

termPositions in class IndexReader

Throws:

IOException

getTermFreqVectors

public TermFreqVector[] getTermFreqVectors(int docNumber)
                                    throws IOException

Specified by:

getTermFreqVectors in class IndexReader

Throws:

IOException

getTermFreqVector

public TermFreqVector getTermFreqVector(int docNumber,
                               String field)
                                 throws IOException

Specified by:

getTermFreqVector in class IndexReader

Throws:

IOException

getTermFreqVector

public void getTermFreqVector(int docNumber,
                     String field,
                     TermVectorMapper mapper)
                       throws IOException

Specified by:

getTermFreqVector in class IndexReader

Throws:

IOException

getTermFreqVector

public void getTermFreqVector(int docNumber,
                     TermVectorMapper mapper)
                       throws IOException

Specified by:

getTermFreqVector in class IndexReader

Throws:

IOException