Lucene++ - a full-featured, c++ search engine
API Documentation


Loading...
Searching...
No Matches
Public Member Functions | Static Public Member Functions | Protected Member Functions | Protected Attributes
Lucene::DirectoryReader Class Reference

An IndexReader which reads indexes with multiple segments. More...

#include <DirectoryReader.h>

+ Inheritance diagram for Lucene::DirectoryReader:

Public Member Functions

 DirectoryReader (const DirectoryPtr &directory, const SegmentInfosPtr &sis, const IndexDeletionPolicyPtr &deletionPolicy, bool readOnly, int32_t termInfosIndexDivisor)
 Construct reading the named set of readers.
 
 DirectoryReader (const IndexWriterPtr &writer, const SegmentInfosPtr &infos, int32_t termInfosIndexDivisor)
 Used by near real-time search.
 
 DirectoryReader (const DirectoryPtr &directory, const SegmentInfosPtr &infos, Collection< SegmentReaderPtr > oldReaders, Collection< int32_t > oldStarts, MapStringByteArray oldNormsCache, bool readOnly, bool doClone, int32_t termInfosIndexDivisor)
 This constructor is only used for reopen().
 
virtual ~DirectoryReader ()
 
virtual String getClassName ()
 
boost::shared_ptr< DirectoryReadershared_from_this ()
 
void _initialize (Collection< SegmentReaderPtr > subReaders)
 
virtual LuceneObjectPtr clone (const LuceneObjectPtr &other=LuceneObjectPtr())
 Efficiently clones the IndexReader (sharing most internal state).
 
virtual LuceneObjectPtr clone (bool openReadOnly, const LuceneObjectPtr &other=LuceneObjectPtr())
 Clones the IndexReader and optionally changes readOnly. A readOnly reader cannot open a writable reader.
 
virtual IndexReaderPtr reopen ()
 Refreshes an IndexReader if the index has changed since this instance was (re)opened.
 
virtual IndexReaderPtr reopen (bool openReadOnly)
 Just like reopen(), except you can change the readOnly of the original reader. If the index is unchanged but readOnly is different then a new reader will be returned.
 
virtual IndexReaderPtr reopen (const IndexCommitPtr &commit)
 Reopen this reader on a specific commit point. This always returns a readOnly reader. If the specified commit point matches what this reader is already on, and this reader is already readOnly, then this same instance is returned; if it is not already readOnly, a readOnly clone is returned.
 
virtual int64_t getVersion ()
 Version number when this IndexReader was opened.
 
virtual Collection< TermFreqVectorPtrgetTermFreqVectors (int32_t docNumber)
 Return an array of term frequency vectors for the specified document.
 
virtual TermFreqVectorPtr getTermFreqVector (int32_t docNumber, const String &field)
 Return a term frequency vector for the specified document and field.
 
virtual void getTermFreqVector (int32_t docNumber, const String &field, const TermVectorMapperPtr &mapper)
 Load the Term Vector into a user-defined data structure instead of relying on the parallel arrays of the TermFreqVector.
 
virtual void getTermFreqVector (int32_t docNumber, const TermVectorMapperPtr &mapper)
 Map all the term vectors for all fields in a Document.
 
virtual bool isOptimized ()
 Checks is the index is optimized (if it has a single segment and no deletions). Not implemented in the IndexReader base class.
 
virtual int32_t numDocs ()
 Returns the number of documents in this index.
 
virtual int32_t maxDoc ()
 Returns one greater than the largest possible document number.
 
virtual DocumentPtr document (int32_t n, const FieldSelectorPtr &fieldSelector)
 Get the Document at the n'th position. The FieldSelector may be used to determine what Fields to load and how they should be loaded.
 
virtual bool isDeleted (int32_t n)
 Returns true if document n has been deleted.
 
virtual bool hasDeletions ()
 Returns true if any documents have been deleted.
 
virtual bool hasNorms (const String &field)
 Returns true if there are norms stored for this field.
 
virtual ByteArray norms (const String &field)
 Returns the byte-encoded normalization factor for the named field of every document.
 
virtual void norms (const String &field, ByteArray norms, int32_t offset)
 Reads the byte-encoded normalization factor for the named field of every document.
 
virtual TermEnumPtr terms ()
 Returns an enumeration of all the terms in the index.
 
virtual TermEnumPtr terms (const TermPtr &t)
 Returns an enumeration of all terms starting at a given term.
 
virtual int32_t docFreq (const TermPtr &t)
 Returns the number of documents containing the term t.
 
virtual TermDocsPtr termDocs ()
 Returns an unpositioned TermDocs enumerator.
 
virtual TermPositionsPtr termPositions ()
 Returns an unpositioned TermPositions enumerator.
 
virtual void acquireWriteLock ()
 Tries to acquire the WriteLock on this directory. this method is only valid if this IndexReader is directory owner.
 
void startCommit ()
 
void rollbackCommit ()
 
virtual MapStringString getCommitUserData ()
 Retrieve the String userData optionally passed to IndexWriter::commit.
 
virtual bool isCurrent ()
 Check whether any new changes have occurred to the index since this reader was opened.
 
virtual HashSet< String > getFieldNames (FieldOption fieldOption)
 Get a list of unique field names that exist in this index and have the specified field option information.
 
virtual Collection< IndexReaderPtrgetSequentialSubReaders ()
 Returns the sequential sub readers that this reader is logically composed of.
 
virtual DirectoryPtr directory ()
 Returns the directory this index resides in.
 
virtual int32_t getTermInfosIndexDivisor ()
 For IndexReader implementations that use TermInfosReader to read terms, this returns the current indexDivisor as specified when the reader was opened.
 
virtual IndexCommitPtr getIndexCommit ()
 Return the IndexCommit that this reader has opened.
 
- Public Member Functions inherited from Lucene::IndexReader
 IndexReader ()
 
virtual ~IndexReader ()
 
boost::shared_ptr< IndexReadershared_from_this ()
 
int32_t getRefCount ()
 Returns the current refCount for this reader.
 
void incRef ()
 Increments the refCount of this IndexReader instance. RefCounts are used to determine when a reader can be closed safely, i.e. as soon as there are no more references. Be sure to always call a corresponding decRef, in a finally clause; otherwise the reader may never be closed. Note that close simply calls decRef(), which means that the IndexReader will not really be closed until decRef has been called for all outstanding references.
 
void decRef ()
 Decreases the refCount of this IndexReader instance. If the refCount drops to 0, then pending changes (if any) are committed to the index and this reader is closed.
 
int32_t numDeletedDocs ()
 Returns the number of deleted documents.
 
virtual DocumentPtr document (int32_t n)
 Returns the stored fields of the n'th Document in this index.
 
virtual bool hasChanges ()
 Used for testing.
 
virtual void setNorm (int32_t doc, const String &field, uint8_t value)
 Resets the normalization factor for the named field of the named document. The norm represents the product of the field's boost and its length normalization. Thus, to preserve the length normalization values when resetting this, one should base the new value upon the old.
 
virtual void setNorm (int32_t doc, const String &field, double value)
 Resets the normalization factor for the named field of the named document.
 
virtual TermDocsPtr termDocs (const TermPtr &term)
 Returns an enumeration of all the documents which contain term. For each document, the document number, the frequency of the term in that document is also provided, for use in search scoring. If term is null, then all non-deleted docs are returned with freq=1. The enumeration is ordered by document number. Each document number is greater than all that precede it in the enumeration.
 
virtual TermPositionsPtr termPositions (const TermPtr &term)
 Returns an enumeration of all the documents which contain term. For each document, in addition to the document number and frequency of the term in that document, a list of all of the ordinal positions of the term in the document is available. Thus, this method positions of the term in the document is available. This positional information facilitates phrase and proximity searching. The enumeration is ordered by document number. Each document number is greater than all that precede it in the enumeration.
 
virtual void deleteDocument (int32_t docNum)
 Deletes the document numbered docNum. Once a document is deleted it will not appear in TermDocs or TermPostitions enumerations. Attempts to read its field with the document method will result in an error. The presence of this document may still be reflected in the docFreq statistic, though this will be corrected eventually as the index is further modified.
 
virtual int32_t deleteDocuments (const TermPtr &term)
 Deletes all documents that have a given term indexed. This is useful if one uses a document field to hold a unique ID string for the document. Then to delete such a document, one merely constructs a term with the appropriate field and the unique ID string as its text and passes it to this method. See deleteDocument(int) for information about when this deletion will become effective.
 
virtual void undeleteAll ()
 Undeletes all documents currently marked as deleted in this index.
 
void flush ()
 
void flush (MapStringString commitUserData)
 
void commit (MapStringString commitUserData)
 Commit changes resulting from delete, undeleteAll, or setNorm operations. If an exception is hit, then either no changes or all changes will have been committed to the index (transactional semantics).
 
void close ()
 Closes files associated with this index. Also saves any new deletions to disk. No other methods should be called after this has been called.
 
virtual LuceneObjectPtr getFieldCacheKey ()
 
virtual LuceneObjectPtr getDeletesCacheKey ()
 This returns null if the reader has no deletions.
 
virtual int64_t getUniqueTermCount ()
 Returns the number of unique terms (across all fields) in this reader.
 
- Public Member Functions inherited from Lucene::LuceneObject
virtual ~LuceneObject ()
 
virtual void initialize ()
 Called directly after instantiation to create objects that depend on this object being fully constructed.
 
virtual int32_t hashCode ()
 Return hash code for this object.
 
virtual bool equals (const LuceneObjectPtr &other)
 Return whether two objects are equal.
 
virtual int32_t compareTo (const LuceneObjectPtr &other)
 Compare two objects.
 
virtual String toString ()
 Returns a string representation of the object.
 
- Public Member Functions inherited from Lucene::LuceneSync
virtual ~LuceneSync ()
 
virtual SynchronizePtr getSync ()
 Return this object synchronize lock.
 
virtual LuceneSignalPtr getSignal ()
 Return this object signal.
 
virtual void lock (int32_t timeout=0)
 Lock this object using an optional timeout.
 
virtual void unlock ()
 Unlock this object.
 
virtual bool holdsLock ()
 Returns true if this object is currently locked by current thread.
 
virtual void wait (int32_t timeout=0)
 Wait for signal using an optional timeout.
 
virtual void notifyAll ()
 Notify all threads waiting for signal.
 

Static Public Member Functions

static String _getClassName ()
 
static IndexReaderPtr open (const DirectoryPtr &directory, const IndexDeletionPolicyPtr &deletionPolicy, const IndexCommitPtr &commit, bool readOnly, int32_t termInfosIndexDivisor)
 
static int32_t readerIndex (int32_t n, Collection< int32_t > starts, int32_t numSubReaders)
 Find reader for doc n.
 
static HashSet< String > getFieldNames (FieldOption fieldOption, Collection< IndexReaderPtr > subReaders)
 
static Collection< IndexCommitPtrlistCommits (const DirectoryPtr &dir)
 Returns all commit points that exist in the Directory.
 
- Static Public Member Functions inherited from Lucene::IndexReader
static String _getClassName ()
 
static IndexReaderPtr open (const DirectoryPtr &directory)
 Returns a IndexReader reading the index in the given Directory, with readOnly = true.
 
static IndexReaderPtr open (const DirectoryPtr &directory, bool readOnly)
 Returns an IndexReader reading the index in the given Directory. You should pass readOnly = true, since it gives much better concurrent performance, unless you intend to do write operations (delete documents or change norms) with the reader.
 
static IndexReaderPtr open (const IndexCommitPtr &commit, bool readOnly)
 Returns an IndexReader reading the index in the given IndexCommit. You should pass readOnly = true, since it gives much better concurrent performance, unless you intend to do write operations (delete documents or change norms) with the reader.
 
static IndexReaderPtr open (const DirectoryPtr &directory, const IndexDeletionPolicyPtr &deletionPolicy, bool readOnly)
 Returns an IndexReader reading the index in the given Directory, with a custom IndexDeletionPolicy. You should pass readOnly=true, since it gives much better concurrent performance, unless you intend to do write operations (delete documents or change norms) with the reader.
 
static IndexReaderPtr open (const DirectoryPtr &directory, const IndexDeletionPolicyPtr &deletionPolicy, bool readOnly, int32_t termInfosIndexDivisor)
 Returns an IndexReader reading the index in the given Directory, with a custom IndexDeletionPolicy. You should pass readOnly=true, since it gives much better concurrent performance, unless you intend to do write operations (delete documents or change norms) with the reader.
 
static IndexReaderPtr open (const IndexCommitPtr &commit, const IndexDeletionPolicyPtr &deletionPolicy, bool readOnly)
 Returns an IndexReader reading the index in the given Directory, using a specific commit and with a custom IndexDeletionPolicy. You should pass readOnly=true, since it gives much better concurrent performance, unless you intend to do write operations (delete documents or change norms) with the reader.
 
static IndexReaderPtr open (const IndexCommitPtr &commit, const IndexDeletionPolicyPtr &deletionPolicy, bool readOnly, int32_t termInfosIndexDivisor)
 Returns an IndexReader reading the index in the given Directory, using a specific commit and with a custom IndexDeletionPolicy. You should pass readOnly=true, since it gives much better concurrent performance, unless you intend to do write operations (delete documents or change norms) with the reader.
 
static int64_t lastModified (const DirectoryPtr &directory2)
 Returns the time the index in the named directory was last modified. Do not use this to check whether the reader is still up-to-date, use isCurrent() instead.
 
static int64_t getCurrentVersion (const DirectoryPtr &directory)
 Reads version number from segments files. The version number is initialized with a timestamp and then increased by one for each change of the index.
 
static MapStringString getCommitUserData (const DirectoryPtr &directory)
 Reads commitUserData, previously passed to IndexWriter#commit(MapStringString), from current index segments file. This will return null if IndexWriter#commit(MapStringString) has never been called for this index.
 
static bool indexExists (const DirectoryPtr &directory)
 Returns true if an index exists at the specified directory. If the directory does not exist or if there is no index in it.
 
static void main (Collection< String > args)
 Prints the filename and size of each file within a given compound file. Add the -extract flag to extract files to the current working directory. In order to make the extracted version of the index work, you have to copy the segments file from the compound index into the directory where the extracted files are stored.
 
static Collection< IndexCommitPtrlistCommits (const DirectoryPtr &dir)
 Returns all commit points that exist in the Directory. Normally, because the default is KeepOnlyLastCommitDeletionPolicy, there would be only one commit point. But if you're using a custom IndexDeletionPolicy then there could be many commits. Once you have a given commit, you can open a reader on it by calling IndexReader#open(IndexCommit,bool). There must be at least one commit in the Directory, else this method throws an exception. Note that if a commit is in progress while this method is running, that commit may or may not be returned array.
 

Protected Member Functions

IndexReaderPtr doReopenFromWriter (bool openReadOnly, const IndexCommitPtr &commit)
 
IndexReaderPtr doReopen (bool openReadOnly, const IndexCommitPtr &commit)
 
IndexReaderPtr doReopenNoWriter (bool openReadOnly, const IndexCommitPtr &commit)
 
DirectoryReaderPtr doReopen (const SegmentInfosPtr &infos, bool doClone, bool openReadOnly)
 
virtual void doDelete (int32_t docNum)
 Implements deletion of the document numbered docNum.
 
virtual void doUndeleteAll ()
 Implements actual undeleteAll() in subclass.
 
int32_t readerIndex (int32_t n)
 
virtual void doSetNorm (int32_t doc, const String &field, uint8_t value)
 Implements setNorm in subclass.
 
virtual void doCommit (MapStringString commitUserData)
 Commit changes resulting from delete, undeleteAll, or setNorm operations.
 
virtual void doClose ()
 Implements close.
 
- Protected Member Functions inherited from Lucene::IndexReader
void ensureOpen ()
 
void commit ()
 Commit changes resulting from delete, undeleteAll, or setNorm operations. If an exception is hit, then either no changes or all changes will have been committed to the index (transactional semantics).
 
- Protected Member Functions inherited from Lucene::LuceneObject
 LuceneObject ()
 

Protected Attributes

DirectoryPtr _directory
 
bool readOnly
 
IndexWriterWeakPtr _writer
 
IndexDeletionPolicyPtr deletionPolicy
 
HashSet< String > synced
 
LockPtr writeLock
 
SegmentInfosPtr segmentInfos
 
SegmentInfosPtr segmentInfosStart
 
bool stale
 
int32_t termInfosIndexDivisor
 
bool rollbackHasChanges
 
Collection< SegmentReaderPtrsubReaders
 
Collection< int32_t > starts
 
MapStringByteArray normsCache
 
int32_t _maxDoc
 
int32_t _numDocs
 
bool _hasDeletions
 
int64_t maxIndexVersion
 
- Protected Attributes inherited from Lucene::IndexReader
bool closed
 
bool _hasChanges
 
int32_t refCount
 
- Protected Attributes inherited from Lucene::LuceneSync
SynchronizePtr objectLock
 
LuceneSignalPtr objectSignal
 

Additional Inherited Members

- Public Types inherited from Lucene::IndexReader
enum  FieldOption {
  FIELD_OPTION_ALL , FIELD_OPTION_INDEXED , FIELD_OPTION_STORES_PAYLOADS , FIELD_OPTION_OMIT_TERM_FREQ_AND_POSITIONS ,
  FIELD_OPTION_UNINDEXED , FIELD_OPTION_INDEXED_WITH_TERMVECTOR , FIELD_OPTION_INDEXED_NO_TERMVECTOR , FIELD_OPTION_TERMVECTOR ,
  FIELD_OPTION_TERMVECTOR_WITH_POSITION , FIELD_OPTION_TERMVECTOR_WITH_OFFSET , FIELD_OPTION_TERMVECTOR_WITH_POSITION_OFFSET
}
 Constants describing field properties, for example used for IndexReader#getFieldNames(FieldOption). More...
 
- Static Public Attributes inherited from Lucene::IndexReader
static const int32_t DEFAULT_TERMS_INDEX_DIVISOR
 
- Static Protected Member Functions inherited from Lucene::IndexReader
static IndexReaderPtr open (const DirectoryPtr &directory, const IndexDeletionPolicyPtr &deletionPolicy, const IndexCommitPtr &commit, bool readOnly, int32_t termInfosIndexDivisor)
 

Detailed Description

An IndexReader which reads indexes with multiple segments.

Constructor & Destructor Documentation

◆ DirectoryReader() [1/3]

Lucene::DirectoryReader::DirectoryReader ( const DirectoryPtr directory,
const SegmentInfosPtr sis,
const IndexDeletionPolicyPtr deletionPolicy,
bool  readOnly,
int32_t  termInfosIndexDivisor 
)

Construct reading the named set of readers.

◆ DirectoryReader() [2/3]

Lucene::DirectoryReader::DirectoryReader ( const IndexWriterPtr writer,
const SegmentInfosPtr infos,
int32_t  termInfosIndexDivisor 
)

Used by near real-time search.

◆ DirectoryReader() [3/3]

Lucene::DirectoryReader::DirectoryReader ( const DirectoryPtr directory,
const SegmentInfosPtr infos,
Collection< SegmentReaderPtr oldReaders,
Collection< int32_t >  oldStarts,
MapStringByteArray  oldNormsCache,
bool  readOnly,
bool  doClone,
int32_t  termInfosIndexDivisor 
)

This constructor is only used for reopen().

◆ ~DirectoryReader()

virtual Lucene::DirectoryReader::~DirectoryReader ( )
virtual

Member Function Documentation

◆ _getClassName()

static String Lucene::DirectoryReader::_getClassName ( )
inlinestatic

◆ _initialize()

void Lucene::DirectoryReader::_initialize ( Collection< SegmentReaderPtr subReaders)

◆ acquireWriteLock()

virtual void Lucene::DirectoryReader::acquireWriteLock ( )
virtual

Tries to acquire the WriteLock on this directory. this method is only valid if this IndexReader is directory owner.

Reimplemented from Lucene::IndexReader.

Reimplemented in Lucene::ReadOnlyDirectoryReader.

◆ clone() [1/2]

virtual LuceneObjectPtr Lucene::DirectoryReader::clone ( bool  openReadOnly,
const LuceneObjectPtr other = LuceneObjectPtr() 
)
virtual

Clones the IndexReader and optionally changes readOnly. A readOnly reader cannot open a writable reader.

Reimplemented from Lucene::IndexReader.

◆ clone() [2/2]

virtual LuceneObjectPtr Lucene::DirectoryReader::clone ( const LuceneObjectPtr other = LuceneObjectPtr())
virtual

Efficiently clones the IndexReader (sharing most internal state).

On cloning a reader with pending changes (deletions, norms), the original reader transfers its write lock to the cloned reader. This means only the cloned reader may make further changes to the index, and commit the changes to the index on close, but the old reader still reflects all changes made up until it was cloned.

Like reopen(), it's safe to make changes to either the original or the cloned reader: all shared mutable state obeys "copy on write" semantics to ensure the changes are not seen by other readers.

Reimplemented from Lucene::IndexReader.

◆ directory()

virtual DirectoryPtr Lucene::DirectoryReader::directory ( )
virtual

Returns the directory this index resides in.

Reimplemented from Lucene::IndexReader.

◆ docFreq()

virtual int32_t Lucene::DirectoryReader::docFreq ( const TermPtr t)
virtual

Returns the number of documents containing the term t.

Implements Lucene::IndexReader.

◆ doClose()

virtual void Lucene::DirectoryReader::doClose ( )
protectedvirtual

Implements close.

Implements Lucene::IndexReader.

◆ doCommit()

virtual void Lucene::DirectoryReader::doCommit ( MapStringString  commitUserData)
protectedvirtual

Commit changes resulting from delete, undeleteAll, or setNorm operations.

If an exception is hit, then either no changes or all changes will have been committed to the index (transactional semantics).

Implements Lucene::IndexReader.

◆ document()

virtual DocumentPtr Lucene::DirectoryReader::document ( int32_t  n,
const FieldSelectorPtr fieldSelector 
)
virtual

Get the Document at the n'th position. The FieldSelector may be used to determine what Fields to load and how they should be loaded.

Implements Lucene::IndexReader.

◆ doDelete()

virtual void Lucene::DirectoryReader::doDelete ( int32_t  docNum)
protectedvirtual

Implements deletion of the document numbered docNum.

Implements Lucene::IndexReader.

◆ doReopen() [1/2]

IndexReaderPtr Lucene::DirectoryReader::doReopen ( bool  openReadOnly,
const IndexCommitPtr commit 
)
protected

◆ doReopen() [2/2]

DirectoryReaderPtr Lucene::DirectoryReader::doReopen ( const SegmentInfosPtr infos,
bool  doClone,
bool  openReadOnly 
)
protected

◆ doReopenFromWriter()

IndexReaderPtr Lucene::DirectoryReader::doReopenFromWriter ( bool  openReadOnly,
const IndexCommitPtr commit 
)
protected

◆ doReopenNoWriter()

IndexReaderPtr Lucene::DirectoryReader::doReopenNoWriter ( bool  openReadOnly,
const IndexCommitPtr commit 
)
protected

◆ doSetNorm()

virtual void Lucene::DirectoryReader::doSetNorm ( int32_t  doc,
const String &  field,
uint8_t  value 
)
protectedvirtual

Implements setNorm in subclass.

Implements Lucene::IndexReader.

◆ doUndeleteAll()

virtual void Lucene::DirectoryReader::doUndeleteAll ( )
protectedvirtual

Implements actual undeleteAll() in subclass.

Implements Lucene::IndexReader.

◆ getClassName()

virtual String Lucene::DirectoryReader::getClassName ( )
inlinevirtual

Reimplemented from Lucene::IndexReader.

Reimplemented in Lucene::ReadOnlyDirectoryReader.

◆ getCommitUserData()

virtual MapStringString Lucene::DirectoryReader::getCommitUserData ( )
virtual

Retrieve the String userData optionally passed to IndexWriter::commit.

Reimplemented from Lucene::IndexReader.

◆ getFieldNames() [1/2]

virtual HashSet< String > Lucene::DirectoryReader::getFieldNames ( FieldOption  fieldOption)
virtual

Get a list of unique field names that exist in this index and have the specified field option information.

Implements Lucene::IndexReader.

◆ getFieldNames() [2/2]

static HashSet< String > Lucene::DirectoryReader::getFieldNames ( FieldOption  fieldOption,
Collection< IndexReaderPtr subReaders 
)
static

◆ getIndexCommit()

virtual IndexCommitPtr Lucene::DirectoryReader::getIndexCommit ( )
virtual

Return the IndexCommit that this reader has opened.

Reimplemented from Lucene::IndexReader.

◆ getSequentialSubReaders()

virtual Collection< IndexReaderPtr > Lucene::DirectoryReader::getSequentialSubReaders ( )
virtual

Returns the sequential sub readers that this reader is logically composed of.

Reimplemented from Lucene::IndexReader.

◆ getTermFreqVector() [1/3]

virtual TermFreqVectorPtr Lucene::DirectoryReader::getTermFreqVector ( int32_t  docNumber,
const String &  field 
)
virtual

Return a term frequency vector for the specified document and field.

Implements Lucene::IndexReader.

◆ getTermFreqVector() [2/3]

virtual void Lucene::DirectoryReader::getTermFreqVector ( int32_t  docNumber,
const String &  field,
const TermVectorMapperPtr mapper 
)
virtual

Load the Term Vector into a user-defined data structure instead of relying on the parallel arrays of the TermFreqVector.

Implements Lucene::IndexReader.

◆ getTermFreqVector() [3/3]

virtual void Lucene::DirectoryReader::getTermFreqVector ( int32_t  docNumber,
const TermVectorMapperPtr mapper 
)
virtual

Map all the term vectors for all fields in a Document.

Implements Lucene::IndexReader.

◆ getTermFreqVectors()

virtual Collection< TermFreqVectorPtr > Lucene::DirectoryReader::getTermFreqVectors ( int32_t  docNumber)
virtual

Return an array of term frequency vectors for the specified document.

Implements Lucene::IndexReader.

◆ getTermInfosIndexDivisor()

virtual int32_t Lucene::DirectoryReader::getTermInfosIndexDivisor ( )
virtual

For IndexReader implementations that use TermInfosReader to read terms, this returns the current indexDivisor as specified when the reader was opened.

Reimplemented from Lucene::IndexReader.

◆ getVersion()

virtual int64_t Lucene::DirectoryReader::getVersion ( )
virtual

Version number when this IndexReader was opened.

Reimplemented from Lucene::IndexReader.

◆ hasDeletions()

virtual bool Lucene::DirectoryReader::hasDeletions ( )
virtual

Returns true if any documents have been deleted.

Implements Lucene::IndexReader.

◆ hasNorms()

virtual bool Lucene::DirectoryReader::hasNorms ( const String &  field)
virtual

Returns true if there are norms stored for this field.

Reimplemented from Lucene::IndexReader.

◆ isCurrent()

virtual bool Lucene::DirectoryReader::isCurrent ( )
virtual

Check whether any new changes have occurred to the index since this reader was opened.

Reimplemented from Lucene::IndexReader.

◆ isDeleted()

virtual bool Lucene::DirectoryReader::isDeleted ( int32_t  n)
virtual

Returns true if document n has been deleted.

Implements Lucene::IndexReader.

◆ isOptimized()

virtual bool Lucene::DirectoryReader::isOptimized ( )
virtual

Checks is the index is optimized (if it has a single segment and no deletions). Not implemented in the IndexReader base class.

Returns
true if the index is optimized; false otherwise

Reimplemented from Lucene::IndexReader.

◆ listCommits()

static Collection< IndexCommitPtr > Lucene::DirectoryReader::listCommits ( const DirectoryPtr dir)
static

Returns all commit points that exist in the Directory.

◆ maxDoc()

virtual int32_t Lucene::DirectoryReader::maxDoc ( )
virtual

Returns one greater than the largest possible document number.

Implements Lucene::IndexReader.

◆ norms() [1/2]

virtual ByteArray Lucene::DirectoryReader::norms ( const String &  field)
virtual

Returns the byte-encoded normalization factor for the named field of every document.

Implements Lucene::IndexReader.

◆ norms() [2/2]

virtual void Lucene::DirectoryReader::norms ( const String &  field,
ByteArray  norms,
int32_t  offset 
)
virtual

Reads the byte-encoded normalization factor for the named field of every document.

Implements Lucene::IndexReader.

◆ numDocs()

virtual int32_t Lucene::DirectoryReader::numDocs ( )
virtual

Returns the number of documents in this index.

Implements Lucene::IndexReader.

◆ open()

static IndexReaderPtr Lucene::DirectoryReader::open ( const DirectoryPtr directory,
const IndexDeletionPolicyPtr deletionPolicy,
const IndexCommitPtr commit,
bool  readOnly,
int32_t  termInfosIndexDivisor 
)
static

◆ readerIndex() [1/2]

int32_t Lucene::DirectoryReader::readerIndex ( int32_t  n)
protected

◆ readerIndex() [2/2]

static int32_t Lucene::DirectoryReader::readerIndex ( int32_t  n,
Collection< int32_t >  starts,
int32_t  numSubReaders 
)
static

Find reader for doc n.

◆ reopen() [1/3]

virtual IndexReaderPtr Lucene::DirectoryReader::reopen ( )
virtual

Refreshes an IndexReader if the index has changed since this instance was (re)opened.

Opening an IndexReader is an expensive operation. This method can be used to refresh an existing IndexReader to reduce these costs. This method tries to only load segments that have changed or were created after the IndexReader was (re)opened.

If the index has not changed since this instance was (re)opened, then this call is a NOOP and returns this instance. Otherwise, a new instance is returned. The old instance is not closed and remains usable.

If the reader is reopened, even though they share resources internally, it's safe to make changes (deletions, norms) with the new reader. All shared mutable state obeys "copy on write" semantics to ensure the changes are not seen by other readers.

You can determine whether a reader was actually reopened by comparing the old instance with the instance returned by this method:

IndexReaderPtr reader = ...
...
IndexReaderPtr newReader = r.reopen();
if (newReader != reader)
{
    ... // reader was reopened
    reader->close();
}
reader = newReader;
...

Be sure to synchronize that code so that other threads, if present, can never use reader after it has been closed and before it's switched to newReader. If this reader is a near real-time reader (obtained from IndexWriter#getReader(), reopen() will simply call writer.getReader() again for you, though this may change in the future.

Reimplemented from Lucene::IndexReader.

◆ reopen() [2/3]

virtual IndexReaderPtr Lucene::DirectoryReader::reopen ( bool  openReadOnly)
virtual

Just like reopen(), except you can change the readOnly of the original reader. If the index is unchanged but readOnly is different then a new reader will be returned.

Reimplemented from Lucene::IndexReader.

◆ reopen() [3/3]

virtual IndexReaderPtr Lucene::DirectoryReader::reopen ( const IndexCommitPtr commit)
virtual

Reopen this reader on a specific commit point. This always returns a readOnly reader. If the specified commit point matches what this reader is already on, and this reader is already readOnly, then this same instance is returned; if it is not already readOnly, a readOnly clone is returned.

Reimplemented from Lucene::IndexReader.

◆ rollbackCommit()

void Lucene::DirectoryReader::rollbackCommit ( )

◆ shared_from_this()

boost::shared_ptr< DirectoryReader > Lucene::DirectoryReader::shared_from_this ( )
inline

◆ startCommit()

void Lucene::DirectoryReader::startCommit ( )

◆ termDocs()

virtual TermDocsPtr Lucene::DirectoryReader::termDocs ( )
virtual

Returns an unpositioned TermDocs enumerator.

Implements Lucene::IndexReader.

◆ termPositions()

virtual TermPositionsPtr Lucene::DirectoryReader::termPositions ( )
virtual

Returns an unpositioned TermPositions enumerator.

Implements Lucene::IndexReader.

◆ terms() [1/2]

virtual TermEnumPtr Lucene::DirectoryReader::terms ( )
virtual

Returns an enumeration of all the terms in the index.

Implements Lucene::IndexReader.

◆ terms() [2/2]

virtual TermEnumPtr Lucene::DirectoryReader::terms ( const TermPtr t)
virtual

Returns an enumeration of all terms starting at a given term.

Implements Lucene::IndexReader.

Field Documentation

◆ _directory

DirectoryPtr Lucene::DirectoryReader::_directory
protected

◆ _hasDeletions

bool Lucene::DirectoryReader::_hasDeletions
protected

◆ _maxDoc

int32_t Lucene::DirectoryReader::_maxDoc
protected

◆ _numDocs

int32_t Lucene::DirectoryReader::_numDocs
protected

◆ _writer

IndexWriterWeakPtr Lucene::DirectoryReader::_writer
protected

◆ deletionPolicy

IndexDeletionPolicyPtr Lucene::DirectoryReader::deletionPolicy
protected

◆ maxIndexVersion

int64_t Lucene::DirectoryReader::maxIndexVersion
protected

◆ normsCache

MapStringByteArray Lucene::DirectoryReader::normsCache
protected

◆ readOnly

bool Lucene::DirectoryReader::readOnly
protected

◆ rollbackHasChanges

bool Lucene::DirectoryReader::rollbackHasChanges
protected

◆ segmentInfos

SegmentInfosPtr Lucene::DirectoryReader::segmentInfos
protected

◆ segmentInfosStart

SegmentInfosPtr Lucene::DirectoryReader::segmentInfosStart
protected

◆ stale

bool Lucene::DirectoryReader::stale
protected

◆ starts

Collection<int32_t> Lucene::DirectoryReader::starts
protected

◆ subReaders

Collection<SegmentReaderPtr> Lucene::DirectoryReader::subReaders
protected

◆ synced

HashSet<String> Lucene::DirectoryReader::synced
protected

◆ termInfosIndexDivisor

int32_t Lucene::DirectoryReader::termInfosIndexDivisor
protected

◆ writeLock

LockPtr Lucene::DirectoryReader::writeLock
protected

The documentation for this class was generated from the following file:

clucene.sourceforge.net