// 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.
+//
+// See also the documentation provided for the memberfunction SetOwner().
+//
// 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);
//
-// j1.Info();
-// j2.Info("sph");
+// 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.Data();
+// j2.Data("sph");
//
// Float_t e1=j1.GetEnergy();
// Float_t pnorm=j1->GetMomentum();
// 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
// Default constructor
// All variables initialised to 0
// Initial maximum number of tracks is set to the default value
- fTracks=0;
- fNtinit=0;
+ Init();
Reset();
SetNtinit();
}
///////////////////////////////////////////////////////////////////////////
+void AliJet::Init()
+{
+// Initialisation of pointers etc...
+ fTracks=0;
+ fNtinit=0;
+ fTrackCopy=0;
+}
+///////////////////////////////////////////////////////////////////////////
AliJet::AliJet(Int_t n)
{
// Create a jet to hold initially a maximum of n tracks
// All variables initialised to 0
- fTracks=0;
- fNtinit=0;
+ Init();
Reset();
if (n > 0)
{
AliJet::~AliJet()
{
// Default destructor
- if (fTracks) delete fTracks;
- fTracks=0;
+ if (fTracks)
+ {
+ delete fTracks;
+ fTracks=0;
+ }
+}
+///////////////////////////////////////////////////////////////////////////
+void AliJet::SetOwner(Bool_t own)
+{
+// Set ownership of all added objects.
+// The default parameter is own=kTRUE.
+//
+// Invokation of this memberfunction also sets all the copy modes
+// (e.g. TrackCopy & co.) according to the value of own.
+//
+// This function (with own=kTRUE) is particularly useful when reading data
+// from a tree/file, since Reset() will then actually remove all the
+// added objects from memory irrespective of the copy mode settings
+// during the tree/file creation process. In this way it provides a nice way
+// of preventing possible memory leaks in the reading/analysis process.
+//
+// In addition this memberfunction can also be used as a shortcut to set all
+// copy modes in one go during a tree/file creation process.
+// However, in this case the user has to take care to only set/change the
+// ownership (and copy mode) for empty objects (e.g. newly created objects
+// or after invokation of the Reset() memberfunction) otherwise it will
+// very likely result in inconsistent destructor behaviour.
+
+ Int_t mode=1;
+ if (!own) mode=0;
+ if (fTracks) fTracks->SetOwner(own);
+ fTrackCopy=mode;
+}
+///////////////////////////////////////////////////////////////////////////
+AliJet::AliJet(AliJet& j)
+{
+// Copy constructor
+ Init();
+ Reset();
+ SetNtinit();
+ SetTrackCopy(j.GetTrackCopy());
+ SetId(j.GetId());
+
+ AliTrack* tx=0;
+ for (Int_t i=1; i<=j.GetNtracks(); i++)
+ {
+ tx=j.GetTrack(i);
+ if (tx) AddTrack(tx);
+ }
}
///////////////////////////////////////////////////////////////////////////
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)
+ {
+ 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)
+void AliJet::AddTrack(AliTrack& t,Int_t copy)
{
-// Add a track to the jet
+// Add a track to the jet.
+// Note : The optional parameter "copy" is for internal use only.
// 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 (fTrackCopy) fTracks->SetOwner();
+ }
if (fNtrk == fNtmax) // Check if maximum track number is reached
{
fNtmax+=fNtinit;
// Add the track to this jet
fNtrk++;
- fTracks->Add(&t);
+ if (fTrackCopy && copy)
+ {
+ fTracks->Add(new AliTrack(t));
+ }
+ else
+ {
+ fTracks->Add(&t);
+ }
+
(*this)+=(Ali4Vector&)t;
fQ+=t.GetCharge();
+
}
///////////////////////////////////////////////////////////////////////////
-void AliJet::Info(TString f)
+void AliJet::Data(TString f)
{
// Provide jet information within the coordinate frame f
- cout << " *AliJet::Info* Invmass : " << GetInvmass() << " Charge : " << fQ
+ cout << " *AliJet::Data* Id : " << fUserId << " Invmass : " << GetInvmass() << " Charge : " << fQ
<< " Momentum : " << GetMomentum() << " Ntracks : " << fNtrk << endl;
cout << " ";
- Ali4Vector::Info(f);
+ Ali4Vector::Data(f);
}
///////////////////////////////////////////////////////////////////////////
void AliJet::List(TString f)
{
// Provide jet and primary track information within the coordinate frame f
- Info(f); // Information of the current jet
+ Data(f); // Information of the current jet
// The tracks of this jet
AliTrack* t;
{
cout << " ---Track no. " << it << endl;
cout << " ";
- t->Info(f);
+ t->Data(f);
}
else
{
{
// Provide jet and prim.+sec. track information within the coordinate frame f
- Info(f); // Information of the current jet
+ Data(f); // Information of the current jet
// The tracks of this jet
AliTrack* t;
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