// Creation and investigation of a jet of particle tracks.
// An AliJet can be constructed by adding AliTracks.
//
+// To provide maximal flexibility to the user, two modes of track storage
+// are provided by means of the memberfunction SetTrackCopy().
+//
+// a) SetTrackCopy(0) (which is the default).
+// Only the pointers of the 'added' tracks are stored.
+// This mode is typically used by making jet studies based on a fixed list
+// of tracks which stays under user control or is contained for instance
+// in an AliEvent.
+// In this way the AliJet just represents a 'logical structure' for the
+// physics analysis which can be embedded in e.g. an AliEvent or AliVertex.
+//
+// Note :
+// Modifications made to the original tracks also affect the AliTrack objects
+// which are stored in the AliJet.
+//
+// b) SetTrackCopy(1).
+// Of every 'added' track a private copy will be made of which the pointer
+// will be stored.
+// In this way the AliJet represents an entity on its own and modifications
+// made to the original tracks do not affect the AliTrack objects which are
+// stored in the AliJet.
+// This mode will allow 'adding' many different AliTracks into an AliJet by
+// creating only one AliTrack instance in the main programme and using the
+// AliTrack::Reset() and AliTrack parameter setting memberfunctions.
+//
// Coding example to make 2 jets j1 and j2.
// ----------------------------------------
-// j1 contains the AliTracks 1 and 2
-// j2 contains the AliTracks 3 and 4
+// j1 contains the AliTracks t1 and t2
+// j2 contains 10 different AliTracks via tx
//
-// AliTrack t1,t2,t3,t4;
+// AliTrack t1,t2;
// ...
// ... // code to fill the AliTrack data
// ...
-// AliJet j1(5);
-// AliJet j2(12);
+// AliJet j1();
// j1.AddTrack(t1);
// j1.AddTrack(t2);
-// j2.AddTrack(t3);
-// j2.AddTrack(t4);
+//
+// AliJet j2();
+// j2.SetTrackCopy(1);
+// AliTrack* tx=new AliTrack();
+// for (Int_t i=0; i<10; i++)
+// {
+// ...
+// ... // code to set momentum etc... of the track tx
+// ...
+// j2.AddTrack(tx);
+// tx->Reset();
+// }
//
// j1.Info();
// j2.Info("sph");
// Int_t ntk=j1.GetNtracks();
// AliTrack* tj=j1.GetTrack(1);
//
+// delete tx;
+//
// Note : All quantities are in GeV, GeV/c or GeV/c**2
//
//--- Author: Nick van Eijndhoven 10-jul-1997 UU-SAP Utrecht
// Initial maximum number of tracks is set to the default value
fTracks=0;
fNtinit=0;
+ fTrackCopy=0;
Reset();
SetNtinit();
}
// All variables initialised to 0
fTracks=0;
fNtinit=0;
+ fTrackCopy=0;
Reset();
if (n > 0)
{
AliJet::~AliJet()
{
// Default destructor
- if (fTracks) delete fTracks;
- fTracks=0;
+ if (fTracks)
+ {
+ if (fTrackCopy) fTracks->Delete();
+ delete fTracks;
+ fTracks=0;
+ }
}
///////////////////////////////////////////////////////////////////////////
void AliJet::SetNtinit(Int_t n)
// Set the initial maximum number of tracks for this jet
fNtinit=n;
fNtmax=n;
- if (fTracks) delete fTracks;
- fTracks=new TObjArray(fNtmax);
+ if (fTracks)
+ {
+ if (fTrackCopy) fTracks->Delete();
+ delete fTracks;
+ fTracks=0;
+ }
}
///////////////////////////////////////////////////////////////////////////
void AliJet::Reset()
// The max. number of tracks is set to the initial value again
fNtrk=0;
fQ=0;
+ fUserId=0;
Double_t a[4]={0,0,0,0};
SetVector(a,"sph");
if (fNtinit > 0) SetNtinit(fNtinit);
///////////////////////////////////////////////////////////////////////////
void AliJet::AddTrack(AliTrack& t)
{
-// Add a track to the jet
+// Add a track to the jet.
+// Note : In case TrackCopy is set, the originally entered track
+// will be automatically reset.
// In case the maximum number of tracks has been reached
// space will be extended to hold an additional amount of tracks as
-// was initially reserved
+// was initially reserved.
+ if (!fTracks) fTracks=new TObjArray(fNtmax);
if (fNtrk == fNtmax) // Check if maximum track number is reached
{
fNtmax+=fNtinit;
// Add the track to this jet
fNtrk++;
- fTracks->Add(&t);
+ if (fTrackCopy)
+ {
+ fTracks->Add(t.Clone());
+ }
+ else
+ {
+ fTracks->Add(&t);
+ }
+
(*this)+=(Ali4Vector&)t;
fQ+=t.GetCharge();
+
}
///////////////////////////////////////////////////////////////////////////
void AliJet::Info(TString f)
{
// Provide jet information within the coordinate frame f
- cout << " *AliJet::Info* Invmass : " << GetInvmass() << " Charge : " << fQ
+ cout << " *AliJet::Info* Id : " << fUserId << " Invmass : " << GetInvmass() << " Charge : " << fQ
<< " Momentum : " << GetMomentum() << " Ntracks : " << fNtrk << endl;
cout << " ";
Ali4Vector::Info(f);
AliTrack* AliJet::GetTrack(Int_t i)
{
// Return the i-th track of this jet
- return (AliTrack*)fTracks->At(i-1);
+ if (!fTracks)
+ {
+ cout << " *AliJet*::GetTrack* No tracks present." << endl;
+ return 0;
+ }
+ else
+ {
+ if (i<=0 || i>fNtrk)
+ {
+ cout << " *AliJet*::GetTrack* Invalid argument i : " << i
+ << " Ntrk = " << fNtrk << endl;
+ return 0;
+ }
+ else
+ {
+ return (AliTrack*)fTracks->At(i-1);
+ }
+ }
+}
+///////////////////////////////////////////////////////////////////////////
+AliTrack* AliJet::GetIdTrack(Int_t id)
+{
+// Return the track with user identifier "id" of this jet
+ AliTrack* tx=0;
+ AliTrack* t=0;
+ if (!fTracks)
+ {
+ cout << " *AliJet*::GetIdTrack* No tracks present." << endl;
+ return 0;
+ }
+ else
+ {
+ for (Int_t i=0; i<fNtrk; i++)
+ {
+ tx=(AliTrack*)fTracks->At(i);
+ if (id == tx->GetId()) t=tx;
+ }
+ return t;
+ }
}
///////////////////////////////////////////////////////////////////////////
Double_t AliJet::GetPt()
return y;
}
///////////////////////////////////////////////////////////////////////////
+void AliJet::SetTrackCopy(Int_t j)
+{
+// (De)activate the creation of private copies of the added tracks.
+// j=0 ==> No private copies are made; pointers of original tracks are stored.
+// j=1 ==> Private copies of the tracks are made and these pointers are stored.
+//
+// Note : Once the storage contains pointer(s) to AliTrack(s) one cannot
+// change the TrackCopy mode anymore.
+// To change the TrackCopy mode for an existing AliJet containing
+// tracks one first has to invoke Reset().
+ if (!fTracks)
+ {
+ if (j==0 || j==1)
+ {
+ fTrackCopy=j;
+ }
+ else
+ {
+ cout << "*AliJet::SetTrackCopy* Invalid argument : " << j << endl;
+ }
+ }
+ else
+ {
+ cout << "*AliJet::SetTrackCopy* Storage already contained tracks."
+ << " ==> TrackCopy mode not changed." << endl;
+ }
+}
+///////////////////////////////////////////////////////////////////////////
+Int_t AliJet::GetTrackCopy()
+{
+// Provide value of the TrackCopy mode.
+// 0 ==> No private copies are made; pointers of original tracks are stored.
+// 1 ==> Private copies of the tracks are made and these pointers are stored.
+ return fTrackCopy;
+}
+///////////////////////////////////////////////////////////////////////////
+void AliJet::SetId(Int_t id)
+{
+// Set a user defined identifier for this jet.
+ fUserId=id;
+}
+///////////////////////////////////////////////////////////////////////////
+Int_t AliJet::GetId()
+{
+// Provide the user defined identifier of this jet.
+ return fUserId;
+}
+///////////////////////////////////////////////////////////////////////////
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff