From Artur:

[u/mrichter/AliRoot.git] / MUON / AliMUONDataInterface.cxx

// Author: Artur Szostak
//  email: artur@alice.phy.uct.ac.za

#include <TError.h>
#include <TParticle.h>

#include "AliRunLoader.h"
#include "AliLoader.h"

#include "AliMUONDataInterface.h"
#include "AliMUONLocalTrigger.h"
#include "AliMUONHit.h"
#include "AliMUONDigit.h"
#include "AliMUONRawCluster.h"
#include "AliLog.h"

#include <iostream>
using std::endl;
using std::cout;


ClassImp(AliMUONDataInterface)


AliMUONDataInterface::AliMUONDataInterface()
	: TObject(), fData(NULL, "MUON", "MUON")
{
// Set all internal pointers to NULL and indices to -1.

	Reset();
}

AliMUONDataInterface::AliMUONDataInterface(const AliMUONDataInterface& rhs)
  : TObject(rhs)
{
// Protected copy constructor

  AliFatal("Not implemented.");
}

AliMUONDataInterface::~AliMUONDataInterface()
{
// Delete the runloader if we created it.
// If the runloader is not to be deleted then call Reset just before 
// the destructor is called.

	if (fRunloader != NULL && fCreatedRunLoader)
		delete fRunloader;
}

AliMUONDataInterface&  
AliMUONDataInterface::operator=(const AliMUONDataInterface& rhs)
{
// Protected assignement operator

  if (this == &rhs) return *this;

  AliFatal("Not implemented.");
    
  return *this;  
}    
          

void AliMUONDataInterface::Reset()
{
// Sets all internal pointers to NULL and indices to -1.
// Note: No resources are released!
// Specificaly AliRunLoader is not deleted.

	fCreatedRunLoader = kFALSE;
	fRunloader = NULL;
	fMuonloader = NULL;
	fEventnumber = -1;
	fTrack = -1;
	fSCathode = -1;
	fCathode = -1;
	fHitAddressSet = kFALSE;
	fSDigitAddressSet = kFALSE;
	fDigitAddressSet = kFALSE;
	fClusterAddressSet = kFALSE;
	fTriggerAddressSet = kFALSE;
}


Bool_t AliMUONDataInterface::UseCurrentRunLoader()
{
// Tries to fetch the current runloader with AliRunLoader::GetRunLoader. If nothing is
// currently loaded then kFALSE is returned and AliMUONDataInterface is reset.

	Reset();
	fRunloader = AliRunLoader::GetRunLoader();
	if (fRunloader == NULL) return kFALSE;
	// Fetch the current file name, folder name and event number.
	fFilename = fRunloader->GetFileName();
	fFoldername = fRunloader->GetEventFolder()->GetName();
	fEventnumber = fRunloader->GetEventNumber();

	if ( ! FetchMuonLoader(fFilename.Data(), fFoldername.Data()) )
	{
		Reset();
		return kFALSE;
	}		

	return kTRUE;
}


Bool_t AliMUONDataInterface::FetchMuonLoader(TString filename, TString foldername)
{
	fMuonloader = fRunloader->GetLoader("MUONLoader");
	if (fMuonloader == NULL)
	{
		AliError(Form("Could not find the MUON loader in file: %s and folder: %s", 
			(const char*)filename, (const char*)foldername));
		return kFALSE;
	}
	
	// Need to connect the muon loader to the AliMUONData object,
	// else class to fData will return NULL.
	fData.SetLoader(fMuonloader);
	return kTRUE;
}


Bool_t AliMUONDataInterface::LoadLoaders(TString filename, TString foldername)
{
// Load the run and muon loaders from the specified file and folder.
// kTRUE is returned on success and kFALSE on failure.

	fRunloader = AliRunLoader::Open(filename, foldername, "READ");
	if (fRunloader == NULL)
	{
		AliError(Form("Could not find or load the run loader for the file: %s and folder: %s", 
			(const char*)filename, (const char*)foldername));
		return kFALSE;
	}
	fCreatedRunLoader = kTRUE;
	if ( ! FetchMuonLoader(filename, foldername) )
	{
		fRunloader = NULL;
		return kFALSE;
	}
	
	fFilename = filename;
	fFoldername = foldername;
	fEventnumber = -1;  // Reset the event number to force the event to be loaded.
	return kTRUE;
}


Bool_t AliMUONDataInterface::FetchLoaders(TString filename, TString foldername)
{
// Fetch the run loader and muon loader objects from memory if they already exist,
// or from memory if they do not. 
// If the currently loaded run loader (if any) is not refering to the file and folder
// we are interested in then it is deleted and reopened with the required file and
// folder names.

	if (fRunloader == NULL)
	{
		fRunloader = AliRunLoader::GetRunLoader();
		if (fRunloader == NULL)
			return LoadLoaders(filename, foldername);
		else
		{
			if (fMuonloader == NULL)
			{
				if ( ! FetchMuonLoader(filename, foldername) )
				{
					fRunloader = NULL;
					return kFALSE;
				}
			}
		}
		
		// Fetch the current file and folder names.
		fFilename = fRunloader->GetFileName();
		fFoldername = fRunloader->GetEventFolder()->GetName();
	}

	// If filename or foldername are not the same as the ones currently selected then
	// reopen the file.
	if ( filename.CompareTo(fFilename) != 0 || foldername.CompareTo(fFoldername) != 0 )
	{
		delete fRunloader;
		return LoadLoaders(filename, foldername);
	}
	return kTRUE;
}


Bool_t AliMUONDataInterface::FetchEvent(Int_t event)
{
// Fetch the specified event from the runloader and reset all the track, cathode
// and address flags to force them to be reloaded.
// If a negative event number is specified then the current runloader event
// number is used.

	if (fEventnumber < 0)
	{
		fEventnumber = fRunloader->GetEventNumber();
		fTrack = -1;
		fSCathode = -1;
		fCathode = -1;
		fHitAddressSet = kFALSE;
		fSDigitAddressSet = kFALSE;
		fDigitAddressSet = kFALSE;
		fClusterAddressSet = kFALSE;
		fTriggerAddressSet = kFALSE;
	}
	if ( event != fEventnumber )
	{
		if ( fRunloader->GetEvent(event) < 0 ) return kFALSE;
		fEventnumber = event;
		fTrack = -1;
		fSCathode = -1;
		fCathode = -1;
		fHitAddressSet = kFALSE;
		fSDigitAddressSet = kFALSE;
		fDigitAddressSet = kFALSE;
		fClusterAddressSet = kFALSE;
		fTriggerAddressSet = kFALSE;
	}
	return kTRUE;
}


Bool_t AliMUONDataInterface::FetchTreeK()
{
// Fetch the Kine tree from the current run loader.

	if (fRunloader->TreeK() == NULL)
	{
		fRunloader->LoadKinematics("READ");
		if (fRunloader->TreeK() == NULL)
		{
			AliError("Could not load TreeK.");
			return kFALSE;
		}
	}
	return kTRUE;
}


Bool_t AliMUONDataInterface::FetchTreeH()
{
// Fetch the Hits tree from the current muon loader.
// Set all the required addresses etc...

	if (fMuonloader->TreeH() == NULL)
	{
		fMuonloader->LoadHits("READ");
		if (fMuonloader->TreeH() == NULL)
		{
			AliError("Could not load TreeH.");
			return kFALSE;
		}
		fData.SetTreeAddress("H");
		fHitAddressSet = kTRUE;
	}
	else if ( ! fHitAddressSet )
	{
		fData.SetTreeAddress("H");
		fHitAddressSet = kTRUE;
	}
	return kTRUE;
}


Bool_t AliMUONDataInterface::FetchTreeS()
{
// Fetch the S-Digits tree from the current muon loader.
// Set all the required addresses etc...

	if (fMuonloader->TreeS() == NULL)
	{
		fMuonloader->LoadSDigits("READ");
		if (fMuonloader->TreeS() == NULL)
		{
			AliError("Could not load TreeS.");
			return kFALSE;
		}
		fData.SetTreeAddress("S");
		fSDigitAddressSet = kTRUE;
	}
	else if ( ! fSDigitAddressSet )
	{
		fData.SetTreeAddress("S");
		fSDigitAddressSet = kTRUE;
	}
	return kTRUE;
}


Bool_t AliMUONDataInterface::FetchTreeD()
{
// Fetch the digits tree from the current muon loader.
// Set all the required addresses etc...

	if (fMuonloader->TreeD() == NULL)
	{
		fMuonloader->LoadDigits("READ");
		if (fMuonloader->TreeD() == NULL)
		{
			AliError("Could not load TreeD.");
			return kFALSE;
		}
		fData.SetTreeAddress("D");
		fDigitAddressSet = kTRUE;
	}
	else if ( ! fDigitAddressSet )
	{
		fData.SetTreeAddress("D");
		fDigitAddressSet = kTRUE;
	}
	return kTRUE;
}


Bool_t AliMUONDataInterface::FetchTreeR()
{
// Fetch the reconstructed objects tree from the current muon loader.
// Note: The addresses must still be set. 

	if (fMuonloader->TreeR() == NULL)
	{
		fMuonloader->LoadRecPoints("READ");
		if (fMuonloader->TreeR() == NULL)
		{
			AliError("Could not load TreeR.");
			return kFALSE;
		}
		
		// Need to reset these flags so that the cluster and trigger address
		// gets reset after this method. 
		fClusterAddressSet = kFALSE;
		fTriggerAddressSet = kFALSE;
	}
	return kTRUE;
}


Int_t AliMUONDataInterface::NumberOfEvents(TString filename, TString foldername)
{
// Returns the number of events in the specified file/folder, and -1 on error.

	if ( ! FetchLoaders(filename, foldername) ) return -1;
	return fRunloader->GetNumberOfEvents();
}


Int_t AliMUONDataInterface::NumberOfParticles(TString filename, TString foldername, Int_t event)
{
// Returns the number of events in the specified file/folder, and -1 on error.

	if ( ! FetchLoaders(filename, foldername) ) return -1;
	if ( ! FetchEvent(event) ) return -1;
	if ( ! FetchTreeK() ) return -1;
	return (Int_t) fRunloader->TreeK()->GetEntriesFast();
}


TParticle* AliMUONDataInterface::Particle(
		TString filename, TString foldername, Int_t event, Int_t particle
	)
{
// Returns the specified particle in the given file, folder and event.
// NULL is returned on error.

	if ( ! FetchLoaders(filename, foldername) ) return NULL;
	if ( ! FetchEvent(event) ) return NULL;
	if ( ! FetchTreeK() ) return NULL;
	
	TTree* treeK = fRunloader->TreeK();
	TParticle* p = NULL;
	treeK->GetBranch("Particles")->SetAddress(&p);
	treeK->GetEvent(particle);
	return p;
}


Int_t AliMUONDataInterface::NumberOfTracks(TString filename, TString foldername, Int_t event)
{
// Returns the number of tracks in the specified file/folder and event.
// -1 is returned on error.

	if ( ! FetchLoaders(filename, foldername) ) return -1;
	if ( ! FetchEvent(event) ) return -1;
	if ( ! FetchTreeH() ) return -1;
	return fData.GetNtracks();
}


Int_t AliMUONDataInterface::NumberOfHits(
		TString filename, TString foldername, Int_t event, Int_t track
	)
{
// Returns the number of hits in the specified file/folder, event and track.
// -1 is returned on error.

	if ( ! FetchLoaders(filename, foldername) ) return -1;
	if ( ! FetchEvent(event) ) return -1;
	if ( ! FetchTreeH() ) return -1;

	if (fTrack < 0 || fTrack != track)
	{
		fData.ResetHits();
		fData.GetTrack(track);
		fTrack = track;
	}
	return fData.Hits()->GetEntriesFast();
}


AliMUONHit* AliMUONDataInterface::Hit(
		TString filename, TString foldername, Int_t event,
		Int_t track, Int_t hit
	)
{
// Returns the specified hit in the given file, folder, event and track.
// NULL is returned on error.

	if ( ! FetchLoaders(filename, foldername) ) return NULL;
	if ( ! FetchEvent(event) ) return NULL;
	if ( ! FetchTreeH() ) return NULL;

	if (fTrack < 0 || fTrack != track)
	{
		fData.ResetHits();
		fData.GetTrack(track);
		fTrack = track;
	}
	return static_cast<AliMUONHit*>( fData.Hits()->At(hit) );
}


Int_t AliMUONDataInterface::NumberOfSDigits(
		TString filename, TString foldername, Int_t event,
		Int_t chamber, Int_t cathode
	)
{
// Returns the number of s-digits in the given file, folder, event,
// chamber and cathode. -1 is returned on error.

	Assert( 0 <= chamber && chamber <= 13 );
	Assert( 0 <= cathode && cathode <= 1 );
	
	if ( ! FetchLoaders(filename, foldername) ) return -1;
	if ( ! FetchEvent(event) ) return -1;
	if ( ! FetchTreeS() ) return -1;

	if ( fSCathode != cathode )
	{
		fData.ResetSDigits();
		fData.GetSDigits();
		fSCathode = cathode;
	}
	return fData.SDigits(chamber)->GetEntriesFast();
}


AliMUONDigit* AliMUONDataInterface::SDigit(
		TString filename, TString foldername, Int_t event,
		Int_t chamber, Int_t cathode, Int_t sdigit
	)
{
// Returns the specified s-digit in the given file, folder, event,
// chamber and cathode. NULL is returned on error.

	Assert( 0 <= chamber && chamber <= 13 );
	Assert( 0 <= cathode && cathode <= 1 );
	
	if ( ! FetchLoaders(filename, foldername) ) return NULL;
	if ( ! FetchEvent(event) ) return NULL;
	if ( ! FetchTreeS() ) return NULL;

	if ( fSCathode != cathode )
	{
		fData.ResetSDigits();
		fData.GetSDigits();
		fSCathode = cathode;
	}
	return static_cast<AliMUONDigit*>( fData.SDigits(chamber)->At(sdigit) );
}


Int_t AliMUONDataInterface::NumberOfDigits(
		TString filename, TString foldername, Int_t event,
		Int_t chamber, Int_t cathode
	)
{
// Returns the number of digits in the given file, folder, event,
// chamber and cathode. -1 is returned on error.
	Assert( 0 <= chamber && chamber <= 13 );
	Assert( 0 <= cathode && cathode <= 1 );
	
	if ( ! FetchLoaders(filename, foldername) ) return -1;
	if ( ! FetchEvent(event) ) return -1;
	if ( ! FetchTreeD() ) return -1;

	if ( fCathode != cathode )
	{
		fData.ResetDigits();
		fData.GetDigits();
		fCathode = cathode;
	}
	return fData.Digits(chamber)->GetEntriesFast();
}


AliMUONDigit* AliMUONDataInterface::Digit(
		TString filename, TString foldername, Int_t event,
		Int_t chamber, Int_t cathode, Int_t digit
	)
{
// Returns the specified digit in the given file, folder, event,
// chamber and cathode. NULL is returned on error.

	Assert( 0 <= chamber && chamber <= 13 );
	Assert( 0 <= cathode && cathode <= 1 );
	
	if ( ! FetchLoaders(filename, foldername) ) return NULL;
	if ( ! FetchEvent(event) ) return NULL;
	if ( ! FetchTreeD() ) return NULL;

	if ( fCathode != cathode )
	{
		fData.ResetDigits();
		fData.GetDigits();
		fCathode = cathode;
	}
	return static_cast<AliMUONDigit*>( fData.Digits(chamber)->At(digit) );
}


Int_t AliMUONDataInterface::NumberOfRawClusters(
		TString filename, TString foldername, Int_t event, Int_t chamber
	)
{
// Returns the number of raw clusters in the specified file, folder, event and chamber.
// -1 is returned or error.

	Assert( 0 <= chamber && chamber <= 13 );
	if ( ! FetchLoaders(filename, foldername) ) return -1;
	if ( ! FetchEvent(event) ) return -1;
	if ( ! FetchTreeR() ) return -1;
	if ( ! fClusterAddressSet )
	{
		// If the raw cluster address in TreeR is not set yet then set it now.
		fData.SetTreeAddress("RC");
		fData.ResetRawClusters();
		fData.GetRawClusters();
		fClusterAddressSet = kTRUE;
	}
	return fData.RawClusters(chamber)->GetEntriesFast();
}


AliMUONRawCluster* AliMUONDataInterface::RawCluster(
		TString filename, TString foldername, Int_t event,
		Int_t chamber, Int_t cluster
	)
{
// Fetch the specified raw cluster from the given file, folder, event and chamber number.
// NULL is returned on error.

	Assert( 0 <= chamber && chamber <= 13 );
	if ( ! FetchLoaders(filename, foldername) ) return NULL;
	if ( ! FetchEvent(event) ) return NULL;
	if ( ! FetchTreeR() ) return NULL;
	if ( ! fClusterAddressSet )
	{
		// If the raw cluster address in TreeR is not set yet then set it now.
		fData.SetTreeAddress("RC");
		fData.ResetRawClusters();
		fData.GetRawClusters();
		fClusterAddressSet = kTRUE;
	}
	return static_cast<AliMUONRawCluster*>( fData.RawClusters(chamber)->At(cluster) );
}


Int_t AliMUONDataInterface::NumberOfLocalTriggers(TString filename, TString foldername, Int_t event)
{
// Return the number of local trigger objects in the specified file, folder and
// event number. -1 is returned on error.

	if ( ! FetchLoaders(filename, foldername) ) return -1;
	if ( ! FetchEvent(event) ) return -1;
	if ( ! FetchTreeD() ) return -1;
	if ( ! fTriggerAddressSet )
	{
		// If the local trigger address in TreeR is not set yet then set it now.
		fData.SetTreeAddress("GLT");
		fData.ResetTrigger();
		fData.GetTriggerD();
		fTriggerAddressSet = kTRUE;
	}
	return fData.LocalTrigger()->GetEntriesFast();
}


AliMUONLocalTrigger* AliMUONDataInterface::LocalTrigger(
		TString filename, TString foldername, Int_t event, Int_t trigger
	)
{
// Fetch the specified local trigger object from the given file, folder and event number.
// NULL is returned on error.

	if ( ! FetchLoaders(filename, foldername) ) return NULL;
	if ( ! FetchEvent(event) ) return NULL;
	if ( ! FetchTreeD() ) return NULL;
	if ( ! fTriggerAddressSet )
	{
		// If the local trigger address in TreeR is not set yet then set it now.
		fData.SetTreeAddress("GLT");
		fData.ResetTrigger();
		fData.GetTriggerD();
		fTriggerAddressSet = kTRUE;
	}
	return static_cast<AliMUONLocalTrigger*>( fData.LocalTrigger()->At(trigger) );
}


Bool_t AliMUONDataInterface::SetFile(TString filename, TString foldername)
{
// Set the current file and folder from which to fetch data.
// kTRUE is returned if the run and muon loaders were found, else kFALSE. 

	return FetchLoaders(filename, foldername);
}


Bool_t AliMUONDataInterface::GetEvent(Int_t event)
{
// Select the current event from which to fetch data.
// kTRUE is returned if the event was found, else kFALSE is returned.

	if (fRunloader == NULL)
	{
		AliError("File not set.");
		return kFALSE;
	}
	else
		return FetchEvent(event);
}


Int_t AliMUONDataInterface::NumberOfEvents()
{
// Get the number of events in the currently selected file.
// -1 is returned on error.

	if (fRunloader == NULL)
	{
		AliError("File not set.");
		return -1;
	}
	return fRunloader->GetNumberOfEvents();
}


Int_t AliMUONDataInterface::NumberOfParticles()
{
// Get the number of particles in the current event.
// -1 is returned on error.

	if (fRunloader == NULL)
	{
		AliError("File not set.");
		return -1;
	}
	if ( ! FetchTreeK() ) return -1;
	return (Int_t) fRunloader->TreeK()->GetEntriesFast();
}


TParticle* AliMUONDataInterface::Particle(Int_t particle)
{
// Fetch the specified particle from the current event.
// NULL is returned on error.

	if (fRunloader == NULL)
	{
		AliError("File not set.");
		return NULL;
	}
	if (fEventnumber < 0)
	{
		AliError("Event not chosen.");
		return NULL;
	}
	if ( ! FetchTreeK() ) return NULL;
	TTree* treeK = fRunloader->TreeK();
	TParticle* p = NULL;
	treeK->GetBranch("Particles")->SetAddress(&p);
	treeK->GetEvent(particle);
	return p;
}


Int_t AliMUONDataInterface::NumberOfTracks()
{
// Get the number of tracks in the current event.
// -1 is returned on error.

	if (fRunloader == NULL)
	{
		AliError("File not set.");
		return -1;
	}
	if (fEventnumber < 0)
	{
		AliError( "Event not chosen.");
		return -1;
	}
	if ( ! FetchTreeH() ) return -1;
	return fData.GetNtracks();
}


Int_t AliMUONDataInterface::NumberOfHits(Int_t track)
{
// Get the number of hits for the given track in the current event.
// -1 is returned on error.

	if (fRunloader == NULL)
	{
		AliError("File not set.");
		return -1;
	}
	if (fEventnumber < 0)
	{
		AliError("Event not chosen.");
		return -1;
	}
	if ( ! FetchTreeH() ) return -1;
	if (fTrack < 0 || fTrack != track)
	{
		fData.ResetHits();
		fData.GetTrack(track);
		fTrack = track;
	}
	return fData.Hits()->GetEntriesFast();
}


AliMUONHit* AliMUONDataInterface::Hit(Int_t track, Int_t hit)
{
// Fetch the specified hit from the current event.
// NULL is returned on error.

	if (fRunloader == NULL)
	{
		AliError("File not set.");
		return NULL;
	}
	if (fEventnumber < 0)
	{
		AliError("Event not chosen.");
		return NULL;
	}
	if ( ! FetchTreeH() ) return NULL;
	if (fTrack < 0 || fTrack != track)
	{
		fData.ResetHits();
		fData.GetTrack(track);
		fTrack = track;
	}
	return static_cast<AliMUONHit*>( fData.Hits()->At(hit) );
}


Int_t AliMUONDataInterface::NumberOfSDigits(Int_t chamber, Int_t cathode)
{
// Get the number of s-digits on the chamber, cathode in the current event.
// -1 is returned on error.

	Assert( 0 <= chamber && chamber <= 13 );
	Assert( 0 <= cathode && cathode <= 1 );
	
	if (fRunloader == NULL)
	{
		AliError("File not set.");
		return -1;
	}
	if (fEventnumber < 0)
	{
		AliError("Event not chosen.");
		return -1;
	}

	if ( ! FetchTreeS() ) return -1;
	if ( fSCathode != cathode )
	{
		fData.ResetSDigits();
		fData.GetSDigits();
		fSCathode = cathode;
	}
	return fData.SDigits(chamber)->GetEntriesFast();
}


AliMUONDigit* AliMUONDataInterface::SDigit(Int_t chamber, Int_t cathode, Int_t sdigit)
{
// Fetch the specified s-digits on the chamber, cathode from the current event.
// NULL is returned on error.

	Assert( 0 <= chamber && chamber <= 13 );
	Assert( 0 <= cathode && cathode <= 1 );
	
	if (fRunloader == NULL)
	{
		AliError("File not set.");
		return NULL;
	}
	if (fEventnumber < 0)
	{
		AliError("Event not chosen.");
		return NULL;
	}

	if ( ! FetchTreeS() ) return NULL;
	if ( fSCathode != cathode )
	{
		fData.ResetSDigits();
		fData.GetSDigits();
		fSCathode = cathode;
	}
	return static_cast<AliMUONDigit*>( fData.SDigits(chamber)->At(sdigit) );
}


Int_t AliMUONDataInterface::NumberOfDigits(Int_t chamber, Int_t cathode)
{
// Get the number of digits on the chamber, cathode in the current event.
// -1 is returned on error.

	Assert( 0 <= chamber && chamber <= 13 );
	Assert( 0 <= cathode && cathode <= 1 );
	
	if (fRunloader == NULL)
	{
		AliError("File not set.");
		return -1;
	}
	if (fEventnumber < 0)
	{
		AliError("Event not chosen.");
		return -1;
	}
	
	if ( ! FetchTreeD() ) return -1;
	if ( fCathode != cathode )
	{
		fData.ResetDigits();
		fData.GetDigits();
		fCathode = cathode;
	}
	return fData.Digits(chamber)->GetEntriesFast();
}


AliMUONDigit* AliMUONDataInterface::Digit(Int_t chamber, Int_t cathode, Int_t digit)
{
// Fetch the specified digits on the chamber, cathode from the current event.
// NULL is returned on error.

	Assert( 0 <= chamber && chamber <= 13 );
	Assert( 0 <= cathode && cathode <= 1 );
	
	if (fRunloader == NULL)
	{
		AliError("File not set.");
		return NULL;
	}
	if (fEventnumber < 0)
	{
		AliError("Event not chosen.");
		return NULL;
	}

	if ( ! FetchTreeD() ) return NULL;
	if ( fCathode != cathode )
	{
		fData.ResetDigits();
		fData.GetDigits();
		fCathode = cathode;
	}
	return static_cast<AliMUONDigit*>( fData.Digits(chamber)->At(digit) );
}


Int_t AliMUONDataInterface::NumberOfRawClusters(Int_t chamber)
{
// Get the number of raw clusters on the given chamber in the current event.
// -1 is returned on error.

	Assert( 0 <= chamber && chamber <= 13 );

	if (fRunloader == NULL)
	{
		AliError("File not set.");
		return -1;
	}
	if (fEventnumber < 0)
	{
		AliError("Event not chosen.");
		return -1;
	}

	if ( ! FetchTreeR() ) return -1;
	if ( ! fClusterAddressSet )
	{
		fData.SetTreeAddress("RC");
		fData.ResetRawClusters();
		fData.GetRawClusters();
		fClusterAddressSet = kTRUE;
	}
	return fData.RawClusters(chamber)->GetEntriesFast();
}


AliMUONRawCluster* AliMUONDataInterface::RawCluster(Int_t chamber, Int_t cluster)
{
// Fetch the specified raw cluster on the given chamber from the current event.
// NULL is returned on error.

	Assert( 0 <= chamber && chamber <= 13 );

	if (fRunloader == NULL)
	{
		AliError("File not set.");
		return NULL;
	}
	if (fEventnumber < 0)
	{
		AliError("Event not chosen.");
		return NULL;
	}

	if ( ! FetchTreeR() ) return NULL;
	if ( ! fClusterAddressSet )
	{
		fData.SetTreeAddress("RC");
		fData.ResetRawClusters();
		fData.GetRawClusters();
		fClusterAddressSet = kTRUE;
	}
	return static_cast<AliMUONRawCluster*>( fData.RawClusters(chamber)->At(cluster) );
}


Int_t AliMUONDataInterface::NumberOfLocalTriggers()
{
// Get the number of local trigger objects in the current event.
// -1 is returned on error.

	if (fRunloader == NULL)
	{
		AliError("File not set.");
		return -1;
	}
	if (fEventnumber < 0)
	{
		AliError("Event not chosen.");
		return -1;
	}

	if ( ! FetchTreeD() ) return -1;
	if ( ! fTriggerAddressSet )
	{
		fData.SetTreeAddress("GLT");
		fData.ResetTrigger();
		fData.GetTriggerD();
		fTriggerAddressSet = kTRUE;
	}
	return fData.LocalTrigger()->GetEntriesFast();
}


AliMUONLocalTrigger* AliMUONDataInterface::LocalTrigger(Int_t trigger)
{
// Fetch the specified local trigger object from the current event.
// NULL is returned on error.

	if (fRunloader == NULL)
	{
		AliError("File not set.");
		return NULL;
	}
	if (fEventnumber < 0)
	{
		AliError( "Event not chosen.");
		return NULL;
	}

	if ( ! FetchTreeD() ) return NULL;
	if ( ! fTriggerAddressSet )
	{
		fData.SetTreeAddress("GLT");
		fData.ResetTrigger();
		fData.GetTriggerD();
		fTriggerAddressSet = kTRUE;
	}
	return static_cast<AliMUONLocalTrigger*>( fData.LocalTrigger()->At(trigger) );
}