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2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
17 // Author: Andrei Gheata, 31/05/2006
19 //==============================================================================
20 // AliAnalysysDataSlot - Class representing a data slot of an analysis task.
21 // An analysis slot enforces a certain data type required by the Exec()
22 // method of the analysis task. The slot must be connected to a data
23 // container with data of the same type.
25 // The class should not be directly created by users - it is created by
26 // each AliAnalysisTask when defining its input/output slots using:
28 // AliAnalysisTask::SetInput(Int_t index, TClass *type);
29 // AliAnalysisTask::SetOutput(TClass *type);
31 // An existing data contaner (AliAnalysisDataContainer) can be connected to the
32 // input/output slots of an analysis task using:
34 // AliAnalysisModule::ConnectInput(AliAnalysisTask *task, Int_t islot,
35 // AliAnalysisDataContainer *cont)
36 // AliAnalysisModule::ConnectOutput(AliAnalysisTask *task,
37 // AliAnalysisDataContainer *cont)
38 // To connect a slot to a data container, the data types declared by both must
40 //==============================================================================
46 #include "AliAnalysisDataSlot.h"
47 #include "AliAnalysisTask.h"
48 #include "AliAnalysisDataContainer.h"
50 ClassImp(AliAnalysisDataSlot)
52 //______________________________________________________________________________
53 AliAnalysisDataSlot& AliAnalysisDataSlot::operator=(const AliAnalysisDataSlot &slot)
56 if (&slot == this) return *this;
57 TObject::operator=(slot);
59 fParent = slot.fParent;
60 fContainer = slot.fContainer;
64 //______________________________________________________________________________
65 Bool_t AliAnalysisDataSlot::ConnectContainer(AliAnalysisDataContainer *cont)
67 // Connect the data slot with a given container. The operation will succeed only
68 // if the type defined by the slot inherits from the type enforced by the container.
69 // The error message in case of failure is posted by the caller.
70 if (!cont || !fType) return kFALSE;
71 if (!fType->InheritsFrom(cont->GetType())) {
72 AliError(Form("Data slot of type %s of task %s cannot be connected to data container %s of type %s",
73 fType->GetName(), fParent->GetName(), cont->GetName(), cont->GetType()->GetName()));
80 //______________________________________________________________________________
81 void *AliAnalysisDataSlot::GetBranchAddress(const char *branchname) const
83 // Retrieve the address for a given branch. One should always test this before
84 // using SetBranchAddress because the address gets set by the first caller.
85 // Call this in MyTask::Init()
86 if (!fType->InheritsFrom(TTree::Class())) {
87 AliFatal(Form("Cannot call GetBranchAddress() for data slot of task %s not pointing to tree-type data", fParent->GetName()));
91 AliFatal(Form("Cannot call GetBranchAddress() for data slot of task %s while data is not ready", fParent->GetName()));
94 TTree *tree = (TTree*)GetData();
95 TBranch *br = tree->GetBranch(branchname);
97 AliFatal(Form("Branch %s not found in tree %s as input of task %s...",
98 branchname, tree->GetName(), fParent->GetName()));
101 return br->GetAddress();
104 //______________________________________________________________________________
105 Bool_t AliAnalysisDataSlot::SetBranchAddress(const char *branchname, void *address)
107 // Set a branch address for input tree. To be called during MyTask::Init()
108 // only if GetBranchAddress() returns a NULL pointer for a tree-type slot.
109 if (GetBranchAddress(branchname)) {
110 AliError(Form("Branch address for %s already set by other task. Call first GetBranchAddress() in %s::Init()",
111 branchname, fParent->GetName()));
114 TTree *tree = (TTree*)GetData();
115 tree->SetBranchAddress(branchname, address);
119 //______________________________________________________________________________
120 TObject *AliAnalysisDataSlot::GetData() const
122 // Retreives the data from the container if it is ready.
124 AliError(Form("Data slot of type %s of task %s has no connected data container",
125 fType->GetName(), fParent->GetName()));
128 if (!fContainer->IsDataReady()) return NULL;
129 return fContainer->GetData();
132 //______________________________________________________________________________
133 Bool_t AliAnalysisDataSlot::IsDataReady() const
135 // Check if data for this slot is ready in its container.
137 AliError(Form("Data slot of type %s of task %s has no connected data container",
138 fType->GetName(), fParent->GetName()));
141 return fContainer->IsDataReady();