author | hgs |
Fri, 15 Oct 2010 12:09:28 +0530 | |
changeset 24 | 65456528cac2 |
parent 0 | 671dee74050a |
permissions | -rw-r--r-- |
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/*------------------------------------------------------------------------------ |
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* Copyright (C) 2003-2006 Ben van Klinken and the CLucene Team |
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* |
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* Distributable under the terms of either the Apache License (Version 2.0) or |
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* the GNU Lesser General Public License, as specified in the COPYING file. |
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------------------------------------------------------------------------------*/ |
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#ifndef _lucene_index_IndexReader_ |
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#define _lucene_index_IndexReader_ |
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#if defined(_LUCENE_PRAGMA_ONCE) |
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# pragma once |
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#endif |
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#include "clucene/store/directory.h" |
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#include "CLucene/store/FSDirectory.h" |
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#include "CLucene/store/Lock.h" |
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#include "clucene/document/document.h" |
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#include "CLucene/index/TermVector.h" |
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#include "CLucene/index/SegmentInfos.h" |
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#include "clucene/index/terms.h" |
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CL_NS_DEF(index) |
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/** IndexReader is an abstract class, providing an interface for accessing an |
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index. Search of an index is done entirely through this abstract interface, |
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so that any subclass which implements it is searchable. |
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<p> Concrete subclasses of IndexReader are usually constructed with a call to |
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one of the static <code>open()</code> methods, e.g. {@link #open(String)}. |
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<p> For efficiency, in this API documents are often referred to via |
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<i>document numbers</i>, non-negative integers which each name a unique |
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document in the index. These document numbers are ephemeral--they may change |
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as documents are added to and deleted from an index. Clients should thus not |
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rely on a given document having the same number between sessions. |
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<p> An IndexReader can be opened on a directory for which an IndexWriter is |
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opened already, but it cannot be used to delete documents from the index then. |
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*/ |
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class IndexReader :LUCENE_BASE{ |
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public: |
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//Callback for classes that need to know if IndexReader is closing. |
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typedef void (*CloseCallback)(IndexReader*, void*); |
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class CloseCallbackCompare:public CL_NS(util)::Compare::_base{ |
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public: |
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bool operator()( CloseCallback t1, CloseCallback t2 ) const{ |
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return t1 > t2; |
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} |
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static void doDelete(CloseCallback ){ |
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} |
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}; |
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enum FieldOption { |
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// all fields |
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ALL = 1, |
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// all indexed fields |
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INDEXED = 2, |
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// all fields which are not indexed |
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UNINDEXED = 4, |
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// all fields which are indexed with termvectors enables |
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INDEXED_WITH_TERMVECTOR = 8, |
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// all fields which are indexed but don't have termvectors enabled |
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INDEXED_NO_TERMVECTOR = 16, |
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// all fields where termvectors are enabled. Please note that only standard termvector fields are returned |
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TERMVECTOR = 32, |
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// all field with termvectors wiht positions enabled |
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TERMVECTOR_WITH_POSITION = 64, |
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// all fields where termvectors with offset position are set |
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TERMVECTOR_WITH_OFFSET = 128, |
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// all fields where termvectors with offset and position values set |
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TERMVECTOR_WITH_POSITION_OFFSET = 256 |
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}; |
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private: |
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CL_NS(store)::LuceneLock* writeLock; |
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bool directoryOwner; |
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bool stale; |
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bool hasChanges; |
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bool closeDirectory; |
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SegmentInfos* segmentInfos; |
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CL_NS(store)::Directory* directory; |
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typedef CL_NS(util)::CLSet<CloseCallback, void*, |
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CloseCallbackCompare, |
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CloseCallbackCompare> CloseCallbackMap; |
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CloseCallbackMap closeCallbacks; |
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/** Internal use. Implements commit */ |
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virtual void doCommit() = 0; |
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/** |
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* Tries to acquire the WriteLock on this directory. |
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* this method is only valid if this IndexReader is directory owner. |
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* |
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* @throws IOException If WriteLock cannot be acquired. |
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*/ |
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void aquireWriteLock(); |
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protected: |
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/** |
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* Constructor used if IndexReader is not owner of its directory. |
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* This is used for IndexReaders that are used within other IndexReaders that take care or locking directories. |
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* |
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* @param directory Directory where IndexReader files reside. |
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*/ |
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IndexReader(CL_NS(store)::Directory* dir); |
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/** |
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* Constructor used if IndexReader is owner of its directory. |
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* If IndexReader is owner of its directory, it locks its directory in case of write operations. |
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* |
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* @param directory Directory where IndexReader files reside. |
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* @param segmentInfos Used for write-l |
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* @param closeDirectory |
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*/ |
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IndexReader(CL_NS(store)::Directory* directory, SegmentInfos* segmentInfos, bool closeDirectory); |
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/// Implements close. |
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virtual void doClose() = 0; |
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/** Implements setNorm in subclass.*/ |
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virtual void doSetNorm(int32_t doc, const TCHAR* field, uint8_t value) = 0; |
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/** Implements actual undeleteAll() in subclass. */ |
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virtual void doUndeleteAll() = 0; |
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|
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/** Implements deletion of the document numbered <code>docNum</code>. |
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* Applications should call {@link #deleteDocument(int32_t)} or {@link #deleteDocuments(Term*)}. |
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*/ |
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virtual void doDelete(const int32_t docNum) = 0; |
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|
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public: |
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141 |
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// CPIXASYNC DEFINE_MUTEX(THIS_LOCK) |
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DEFINE_CRUCIAL_MUTEX(IndexReader_THIS_LOCK) |
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|
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///Do not access this directly, only public so that MultiReader can access it |
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virtual void commit(); |
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|
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|
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/** Undeletes all documents currently marked as deleted in this index.*/ |
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void undeleteAll(); |
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|
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/** |
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* Get a list of unique field names that exist in this index and have the specified |
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* field option information. |
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* @param fldOption specifies which field option should be available for the returned fields |
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* @return Collection of Strings indicating the names of the fields. |
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* @see IndexReader.FieldOption |
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*/ |
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virtual void getFieldNames(FieldOption fldOption, CL_NS(util)::StringArrayWithDeletor& retarray) = 0; |
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|
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_CL_DEPRECATED( getFieldNames(FieldOption, StringArrayWithDeletor&) ) virtual TCHAR** getFieldNames(); |
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_CL_DEPRECATED( getFieldNames(FieldOption, StringArrayWithDeletor&) ) virtual TCHAR** getFieldNames(bool indexed); |
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|
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/** Returns the byte-encoded normalization factor for the named field of |
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* every document. This is used by the search code to score documents. |
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* |
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* The number of bytes returned is the size of the IndexReader->maxDoc() |
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* MEMORY: The values are cached, so don't delete the returned byte array. |
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* @see Field#setBoost(float_t) |
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*/ |
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virtual uint8_t* norms(const TCHAR* field) = 0; |
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|
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/** Reads the byte-encoded normalization factor for the named field of every |
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* document. This is used by the search code to score documents. |
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* |
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* @see Field#setBoost(float_t) |
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*/ |
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virtual void norms(const TCHAR* field, uint8_t* bytes) = 0; |
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/** Expert: Resets the normalization factor for the named field of the named |
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* document. |
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* |
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* @see #norms(TCHAR*) |
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* @see Similarity#decodeNorm(uint8_t) |
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*/ |
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void setNorm(int32_t doc, const TCHAR* field, float_t value); |
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|
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/** Expert: Resets the normalization factor for the named field of the named |
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* document. The norm represents the product of the field's {@link |
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* Field#setBoost(float_t) boost} and its {@link Similarity#lengthNorm(TCHAR*, |
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* int32_t) length normalization}. Thus, to preserve the length normalization |
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* values when resetting this, one should base the new value upon the old. |
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* |
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* @see #norms(TCHAR*) |
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* @see Similarity#decodeNorm(uint8_t) |
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*/ |
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void setNorm(int32_t doc, const TCHAR* field, uint8_t value); |
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/// Release the write lock, if needed. |
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virtual ~IndexReader(); |
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|
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/// Returns an IndexReader reading the index in an FSDirectory in the named path. |
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static IndexReader* open(const char* path); |
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|
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/// Returns an IndexReader reading the index in the given Directory. |
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static IndexReader* open( CL_NS(store)::Directory* directory, bool closeDirectory=false); |
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|
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/** |
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* Returns the time the index in the named directory was last modified. |
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* Do not use this to check whether the reader is still up-to-date, use |
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* {@link #isCurrent()} instead. |
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*/ |
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static uint64_t lastModified(const char* directory); |
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/** |
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* Returns the time the index in the named directory was last modified. |
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* Do not use this to check whether the reader is still up-to-date, use |
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* {@link #isCurrent()} instead. |
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*/ |
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static uint64_t lastModified(const CL_NS(store)::Directory* directory); |
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/** |
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* Reads version number from segments files. The version number is |
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* initialized with a timestamp and then increased by one for each change of |
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* the index. |
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* |
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* @param directory where the index resides. |
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* @return version number. |
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* @throws IOException if segments file cannot be read |
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*/ |
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static int64_t getCurrentVersion(CL_NS(store)::Directory* directory); |
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/** |
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* Reads version number from segments files. The version number is |
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* initialized with a timestamp and then increased by one for each change of |
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* the index. |
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* |
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* @param directory where the index resides. |
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* @return version number. |
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* @throws IOException if segments file cannot be read |
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*/ |
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static int64_t getCurrentVersion(const char* directory); |
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/** |
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* Version number when this IndexReader was opened. |
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*/ |
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int64_t getVersion(); |
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/** |
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* Check whether this IndexReader still works on a current version of the index. |
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* If this is not the case you will need to re-open the IndexReader to |
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* make sure you see the latest changes made to the index. |
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* |
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* @throws IOException |
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*/ |
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bool isCurrent(); |
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/** |
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* Return an array of term frequency vectors for the specified document. |
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* The array contains a vector for each vectorized field in the document. |
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* Each vector contains terms and frequencies for all terms in a given vectorized field. |
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* If no such fields existed, the method returns null. The term vectors that are |
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* returned my either be of type TermFreqVector or of type TermPositionsVector if |
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* positions or offsets have been stored. |
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* |
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* @param docNumber document for which term frequency vectors are returned |
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* @return array of term frequency vectors. May be null if no term vectors have been |
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* stored for the specified document. |
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* @throws IOException if index cannot be accessed |
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* @see org.apache.lucene.document.Field.TermVector |
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*/ |
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virtual bool getTermFreqVectors(int32_t docNumber, Array<TermFreqVector*>& result) =0; |
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|
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/** |
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* Return a term frequency vector for the specified document and field. The |
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* returned vector contains terms and frequencies for the terms in |
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* the specified field of this document, if the field had the storeTermVector |
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* flag set. If termvectors had been stored with positions or offsets, a |
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* TermPositionsVector is returned. |
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* |
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* @param docNumber document for which the term frequency vector is returned |
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* @param field field for which the term frequency vector is returned. |
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* @return term frequency vector May be null if field does not exist in the specified |
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* document or term vector was not stored. |
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* @throws IOException if index cannot be accessed |
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* @see org.apache.lucene.document.Field.TermVector |
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*/ |
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virtual TermFreqVector* getTermFreqVector(int32_t docNumber, const TCHAR* field) = 0; |
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|
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/** |
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* Returns <code>true</code> if an index exists at the specified directory. |
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* If the directory does not exist or if there is no index in it. |
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* @param directory the directory to check for an index |
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* @return <code>true</code> if an index exists; <code>false</code> otherwise |
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*/ |
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static bool indexExists(const char* directory); |
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/** |
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* Returns <code>true</code> if an index exists at the specified directory. |
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* If the directory does not exist or if there is no index in it. |
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* @param directory the directory to check for an index |
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* @return <code>true</code> if an index exists; <code>false</code> otherwise |
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* @throws IOException if there is a problem with accessing the index |
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*/ |
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static bool indexExists(const CL_NS(store)::Directory* directory); |
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/** |
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* Returns <code>true</code> if an index exists at the specified directory. |
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* If the directory does not exist or if there is no index in it. |
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* @param directory the directory to check for an index |
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* @return <code>true</code> if an index exists; <code>false</code> otherwise |
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* @throws IOException if there is a problem with accessing the index |
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*/ |
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bool indexExists(void); |
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0
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/** Returns the number of documents in this index. */ |
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virtual int32_t numDocs() = 0; |
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/** Returns one greater than the largest possible document number. |
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* This may be used to, e.g., determine how big to allocate an array which |
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* will have an element for every document number in an index. |
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*/ |
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virtual int32_t maxDoc() const = 0; |
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327 |
|
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/** Gets the stored fields of the <code>n</code><sup>th</sup> |
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* <code>Document</code> in this index. |
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* The fields are not cleared before retrieving the document, so the |
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331 |
* object should be new or just cleared. |
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332 |
*/ |
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virtual bool document(int32_t n, CL_NS(document)::Document*) =0; |
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334 |
|
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_CL_DEPRECATED( document(i, document) ) CL_NS(document)::Document* document(const int32_t n); |
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336 |
|
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337 |
/** Returns true if document <i>n</i> has been deleted */ |
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virtual bool isDeleted(const int32_t n) = 0; |
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339 |
|
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340 |
/** Returns true if any documents have been deleted */ |
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341 |
virtual bool hasDeletions() const = 0; |
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342 |
|
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343 |
/** Returns true if there are norms stored for this field. */ |
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virtual bool hasNorms(const TCHAR* field); |
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345 |
|
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346 |
/** Returns an enumeration of all the terms in the index. |
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* The enumeration is ordered by Term.compareTo(). Each term |
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* is greater than all that precede it in the enumeration. |
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349 |
* @memory Caller must clean up |
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*/ |
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351 |
virtual TermEnum* terms() const =0; |
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352 |
|
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353 |
/** Returns an enumeration of all terms after a given term. |
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* The enumeration is ordered by Term.compareTo(). Each term |
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* is greater than all that precede it in the enumeration. |
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356 |
* @memory Caller must clean up |
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357 |
*/ |
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358 |
virtual TermEnum* terms(const Term* t) const = 0; |
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359 |
|
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360 |
/** Returns the number of documents containing the term <code>t</code>. */ |
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virtual int32_t docFreq(const Term* t) const = 0; |
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362 |
|
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363 |
/* Returns an unpositioned TermPositions enumerator. |
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* @memory Caller must clean up |
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365 |
*/ |
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virtual TermPositions* termPositions() const = 0; |
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367 |
|
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368 |
/** Returns an enumeration of all the documents which contain |
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* <code>term</code>. For each document, in addition to the document number |
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370 |
* and frequency of the term in that document, a list of all of the ordinal |
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* positions of the term in the document is available. Thus, this method |
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* implements the mapping: |
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* |
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* <p><ul> |
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* Term => <docNum, freq, |
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* <pos<sub>1</sub>, pos<sub>2</sub>, ... |
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* pos<sub>freq-1</sub>> |
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* ><sup>*</sup> |
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379 |
* </ul> |
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* <p> This positional information faciliates phrase and proximity searching. |
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* <p>The enumeration is ordered by document number. Each document number is |
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* greater than all that precede it in the enumeration. |
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* @memory Caller must clean up |
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384 |
*/ |
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385 |
TermPositions* termPositions(Term* term) const; |
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|
386 |
|
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387 |
/** Returns an unpositioned {@link TermDocs} enumerator. |
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388 |
* @memory Caller must clean up |
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389 |
*/ |
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390 |
virtual TermDocs* termDocs() const = 0; |
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|
391 |
|
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392 |
/** Returns an enumeration of all the documents which contain |
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* <code>term</code>. For each document, the document number, the frequency of |
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* the term in that document is also provided, for use in search scoring. |
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395 |
* Thus, this method implements the mapping: |
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* <p><ul>Term => <docNum, freq><sup>*</sup></ul> |
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397 |
* <p>The enumeration is ordered by document number. Each document number |
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398 |
* is greater than all that precede it in the enumeration. |
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|
399 |
* @memory Caller must clean up |
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400 |
*/ |
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401 |
TermDocs* termDocs(Term* term) const; |
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|
402 |
|
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|
403 |
/** Deletes the document numbered <code>docNum</code>. Once a document is |
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|
404 |
* deleted it will not appear in TermDocs or TermPostitions enumerations. |
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405 |
* Attempts to read its field with the {@link #document} |
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* method will result in an error. The presence of this document may still be |
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407 |
* reflected in the {@link #docFreq} statistic, though |
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408 |
* this will be corrected eventually as the index is further modified. |
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409 |
*/ |
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410 |
void deleteDocument(const int32_t docNum); |
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411 |
|
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412 |
///@deprecated. Use deleteDocument instead. |
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413 |
_CL_DEPRECATED( deleteDocument ) void deleteDoc(const int32_t docNum){ deleteDocument(docNum); } |
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414 |
|
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415 |
/** Deletes all documents containing <code>term</code>. |
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* This is useful if one uses a document field to hold a unique ID string for |
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* the document. Then to delete such a document, one merely constructs a |
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* term with the appropriate field and the unique ID string as its text and |
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* passes it to this method. |
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* See {@link #deleteDocument(int)} for information about when this deletion will |
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421 |
* become effective. |
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* @return the number of documents deleted |
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423 |
*/ |
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424 |
int32_t deleteDocuments(Term* term); |
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425 |
|
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426 |
///@deprecated. Use deleteDocuments instead. |
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427 |
_CL_DEPRECATED( deleteDocuments ) int32_t deleteTerm(Term* term){ return deleteDocuments(term); } |
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428 |
|
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429 |
/** |
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430 |
* Closes files associated with this index and also saves any new deletions to disk. |
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* No other methods should be called after this has been called. |
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*/ |
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void close(); |
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///Checks if the index in the named directory is currently locked. |
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static bool isLocked(CL_NS(store)::Directory* directory); |
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///Checks if the index in the named directory is currently locked. |
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static bool isLocked(const char* directory); |
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|
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|
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///Forcibly unlocks the index in the named directory. |
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///Caution: this should only be used by failure recovery code, |
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///when it is known that no other process nor thread is in fact |
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///currently accessing this index. |
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static void unlock(CL_NS(store)::Directory* directory); |
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static void unlock(const char* path); |
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|
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/** Returns the directory this index resides in. */ |
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CL_NS(store)::Directory* getDirectory() { return directory; } |
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|
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/** Returns true if the file is a lucene filename (based on extension or filename) */ |
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static bool isLuceneFile(const char* filename); |
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|
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/** |
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* For classes that need to know when the IndexReader closes (such as caches, etc), |
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* should pass their callback function to this. |
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*/ |
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void addCloseCallback(CloseCallback callback, void* parameter); |
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|
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protected: |
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class LockWith:public CL_NS(store)::LuceneLockWith<IndexReader*>{ |
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public: |
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CL_NS(store)::Directory* directory; |
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IndexReader* indexReader; |
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|
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//Constructor |
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LockWith(CL_NS(store)::LuceneLock* lock, CL_NS(store)::Directory* dir); |
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|
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//Reads the segmentinfo file and depending on the number of segments found |
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//it returns a MultiReader or a SegmentReader |
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IndexReader* doBody(); |
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|
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}; |
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friend class IndexReader::LockWith; |
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|
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class CommitLockWith:public CL_NS(store)::LuceneLockWith<void>{ |
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private: |
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IndexReader* reader; |
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public: |
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|
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//Constructor |
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CommitLockWith( CL_NS(store)::LuceneLock* lock, IndexReader* r ); |
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void doBody(); |
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}; |
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friend class IndexReader::CommitLockWith; |
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}; |
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CL_NS_END |
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#endif |
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492 |