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// $Id: TreeWriter.h,v 1.1 2008/05/27 19:36:05 loizides Exp $
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#ifndef DATATREE_TREEWRITER_H
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#define DATATREE_TREEWRITER_H
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#include <TNamed.h>
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#include <TString.h>
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#include <TFile.h>
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#include <TTree.h>
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//--------------------------------------------------------------------------------------------------
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//
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// TreeWriter
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//
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// Class implementing a tree writing infra structure. The class creates and maintaines
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// a tree with name "tname" as given in the constructor. The tree is stored in a file
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// or in multiple files if needed, where the file path name and maximum size can be
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// specified. Using TreeWriter::AddBranch allows to add various branches to the tree.
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// The user has to make sure that (s)he calls TreeWriter::BeginEvent and
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// TreeWriter::EndEvent for every event before and after filling of the branch
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// structures.
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//
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// Authors: C.Loizides
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//
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//--------------------------------------------------------------------------------------------------
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namespace mithep
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{
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class TreeWriter : public TNamed
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{
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public:
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TreeWriter(const char *tname="MitTree", Bool_t doreset = kFALSE);
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~TreeWriter();
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void AddBranch(const char *name, const char *cname, void *obj,
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Int_t bsize, Int_t level);
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void AddBranch(const char *name, const char *cname, void *obj,
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Int_t bsize);
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void AddBranch(const char *name, const char *cname, void *obj);
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Bool_t BeginEvent(Bool_t doreset=kFALSE);
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Bool_t EndEvent(Bool_t doreset=kFALSE);
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const char *GetBaseURL() const { return fBaseURL.IsNull() ? "." : fBaseURL; }
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Int_t GetCompressLevel() const { return fCompressLevel; }
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Long64_t GetEntries() const { return fTree != 0 ? fTree->GetEntries() : 0; }
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Long64_t GetFileSize() const { return fFile != 0 ? fFile->GetEND() : 0; }
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const TFile *GetFile() const { return fFile; }
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const char *GetFileName() const { return Form("%s_%03d.root",
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GetPrefix(), GetFileNumber()); }
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UShort_t GetFileNumber() const { return fFileNumber; }
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const char *GetFullName() const { return Form("%s/%s",
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GetBaseURL(), GetFileName()); }
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const char *GetPrefix() const { return fPrefix; }
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void Print(Option_t *option="") const;
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void SetBaseURL(const char *b) { fBaseURL = b; }
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void SetCompressLevel(Int_t l) { fCompressLevel = l; }
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void SetDefaultBrSize(Int_t s) { fDefBrSize=s; }
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void SetDefaultSL(Int_t s) { fDefSL=s;}
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void SetPrefix(const char *p) { fPrefix = p; }
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void StoreObject(const TObject *obj);
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void SetMaxSize(Long64_t s) { fMaxSize=s; }
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protected:
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TString fBaseURL; //base url for tree storage
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TString fPrefix; //prefix of file name
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UShort_t fFileNumber; //current sequence number
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Int_t fCompressLevel; //compression level used for TFile
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Int_t fDefBrSize; //default buffer size for branches
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Int_t fDefSL; //default split level for branches
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Long64_t fMaxSize; //maximum file size for a file [Bytes]
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const Long64_t fkMinFreeSpace; //minimum free space required for closing file
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const Long64_t fkMinAvgSize; //minimum average entry size
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Long64_t fEvtObjNum; //event object number offset (for TRef)
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Bool_t fIsInit; //true if OpenFile() was called
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Bool_t fDoObjNumReset; //true if obj. number resets automatically (def=0)
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TFile *fFile; //file being written
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TTree *fTree; //tree being filled
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Bool_t IsInit() const { return fIsInit; }
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Bool_t IsFull() const;
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void OpenFile();
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void CloseFile();
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ClassDef(TreeWriter,0) // Tree writer class
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};
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} /*namespace mithep*/
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#endif /*DATATREE_TREEWRITER_H*/
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