RootInputFileSequence.h

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#ifndef IOPool_Input_RootInputFileSequence_h
#define IOPool_Input_RootInputFileSequence_h

/*----------------------------------------------------------------------

RootInputFileSequence: This is an InputSource

----------------------------------------------------------------------*/

#include "InputFile.h"
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Catalog/interface/InputFileCatalog.h"
#include "FWCore/Utilities/interface/InputType.h"

#include <memory>
#include <string>
#include <unordered_map>
#include <vector>

namespace edm {

  class FileCatalogItem;
  class IndexIntoFile;
  class InputFileCatalog;
  class ParameterSetDescription;
  class RootFile;

  class RootInputFileSequence {
  public:
    explicit RootInputFileSequence(ParameterSet const& pset,
                                   InputFileCatalog const& catalog);
    virtual ~RootInputFileSequence();

    RootInputFileSequence(RootInputFileSequence const&) = delete; // Disallow copying and moving
    RootInputFileSequence& operator=(RootInputFileSequence const&) = delete; // Disallow copying and moving

    bool containedInCurrentFile(RunNumber_t run, LuminosityBlockNumber_t lumi, EventNumber_t event) const;
    void readEvent(EventPrincipal& cache);
    std::shared_ptr<LuminosityBlockAuxiliary> readLuminosityBlockAuxiliary_();
    void readLuminosityBlock_(LuminosityBlockPrincipal& lumiPrincipal);
    std::shared_ptr<RunAuxiliary> readRunAuxiliary_();
    void readRun_(RunPrincipal& runPrincipal);
    bool skipToItem(RunNumber_t run, LuminosityBlockNumber_t lumi, EventNumber_t event, size_t fileNameHash = 0U, bool currentFileFirst = true);
    std::shared_ptr<ProductRegistry const> fileProductRegistry() const;
    std::shared_ptr<BranchIDListHelper const> fileBranchIDListHelper() const;
  protected:
    typedef std::shared_ptr<RootFile> RootFileSharedPtr;
    void initFile(bool skipBadFiles) {initFile_(skipBadFiles);}
    void initTheFile(bool skipBadFiles, bool deleteIndexIntoFile, InputSource* input, char const* inputTypeName, InputType inputType);
    bool skipToItemInNewFile(RunNumber_t run, LuminosityBlockNumber_t lumi, EventNumber_t event);
    bool skipToItemInNewFile(RunNumber_t run, LuminosityBlockNumber_t lumi, EventNumber_t event, size_t fileNameHash);

    bool atFirstFile() const {return fileIter_ == fileIterBegin_;}
    bool atLastFile() const {return fileIter_ + 1 == fileIterEnd_;}
    bool noMoreFiles() const {return fileIter_ == fileIterEnd_;}
    bool noFiles() const {return fileIterBegin_ == fileIterEnd_;}
    size_t sequenceNumberOfFile() const {return fileIter_ - fileIterBegin_;}
    size_t numberOfFiles() const {return fileIterEnd_ - fileIterBegin_;}

    void setAtFirstFile() {fileIter_ = fileIterBegin_;}
    void setAtFileSequenceNumber(size_t offset) {fileIter_ = fileIterBegin_ + offset;}
    void setNoMoreFiles() {fileIter_ = fileIterEnd_;}
    void setAtNextFile() {++fileIter_;}
    void setAtPreviousFile() {--fileIter_;}

    std::string const& fileName() const {return fileIter_->fileName();}
    std::string const& logicalFileName() const {return fileIter_->logicalFileName();}
    std::string const& fallbackFileName() const {return fileIter_->fallbackFileName();}
    std::string const& lfn() const {return lfn_;}
    std::vector<FileCatalogItem> const& fileCatalogItems() const;

    std::vector<std::shared_ptr<IndexIntoFile> > const& indexesIntoFiles() const {return indexesIntoFiles_;}
    void setIndexIntoFile(size_t index);
    size_t lfnHash() const {return lfnHash_;}
    bool usedFallback() const {return usedFallback_;}

    RootFileSharedPtr const& rootFile() const {return rootFile_;}
    RootFileSharedPtr& rootFile() {return rootFile_;}
  private:
    InputFileCatalog const& catalog_;
    std::string lfn_;
    size_t lfnHash_;
    bool usedFallback_;
    std::unique_ptr<std::unordered_multimap<size_t, size_t> > findFileForSpecifiedID_;
    std::vector<FileCatalogItem>::const_iterator const fileIterBegin_;
    std::vector<FileCatalogItem>::const_iterator const fileIterEnd_;
    std::vector<FileCatalogItem>::const_iterator fileIter_;
    std::vector<FileCatalogItem>::const_iterator fileIterLastOpened_;
    RootFileSharedPtr rootFile_;
    std::vector<std::shared_ptr<IndexIntoFile> > indexesIntoFiles_;

  private:
    virtual RootFileSharedPtr makeRootFile(std::shared_ptr<InputFile> filePtr) = 0; 
    virtual void initFile_(bool skipBadFiles) = 0;
    virtual void closeFile_() = 0;

  }; // class RootInputFileSequence
}
#endif