DirectoryReader.h

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// Copyright (c) 2009-2014 Alan Wright. All rights reserved.
// Distributable under the terms of either the Apache License (Version 2.0)
// or the GNU Lesser General Public License.
 
#ifndef DIRECTORYREADER_H
#define DIRECTORYREADER_H
 
#include "IndexReader.h"
#include "TermEnum.h"
#include "TermPositions.h"
#include "IndexCommit.h"
#include "SegmentMergeQueue.h"
 
namespace Lucene {
 
class LPPAPI DirectoryReader : public IndexReader {
public:
    DirectoryReader(const DirectoryPtr& directory, const SegmentInfosPtr& sis, const IndexDeletionPolicyPtr& deletionPolicy, bool readOnly, int32_t termInfosIndexDivisor);
 
    DirectoryReader(const IndexWriterPtr& writer, const SegmentInfosPtr& infos, int32_t termInfosIndexDivisor);
 
    DirectoryReader(const DirectoryPtr& directory, const SegmentInfosPtr& infos, Collection<SegmentReaderPtr> oldReaders,
                    Collection<int32_t> oldStarts, MapStringByteArray oldNormsCache, bool readOnly,
                    bool doClone, int32_t termInfosIndexDivisor);
 
    virtual ~DirectoryReader();
 
    LUCENE_CLASS(DirectoryReader);
 
protected:
    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<SegmentReaderPtr> subReaders;
    Collection<int32_t> starts; // 1st docno for each segment
    MapStringByteArray normsCache;
    int32_t _maxDoc;
    int32_t _numDocs;
    bool _hasDeletions;
 
    // Max version in index as of when we opened; this can be > our current segmentInfos version
    // in case we were opened on a past IndexCommit
    int64_t