/data/doxygen/doxygen-1.7.3/gen/CMSSW_4_2_8/src/PhysicsTools/UtilAlgos/src/CachingVariable.cc

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#include "PhysicsTools/UtilAlgos/interface/CachingVariable.h"
#include "PhysicsTools/UtilAlgos/interface/VariableHelper.h"

CachingVariable::evalType VarSplitter::eval(const edm::Event & iEvent) const{
  const CachingVariable * var=edm::Service<VariableHelperService>()->get().variable(var_);
  if (!var->compute(iEvent)) return std::make_pair(false,0);

  double v=(*var)(iEvent);
  if (v<slots_.front()){
    if (useUnderFlow_) return std::make_pair(true,0);
    else return std::make_pair(false,0);
  }
  if (v>=slots_.back()){
    if (useOverFlow_) return std::make_pair(true,(double)maxIndex());
    else return std::make_pair(false,0);
  }
  unsigned int i=1;
  for (;i<slots_.size();++i)
    if (v<slots_[i]) break;

  if (useUnderFlow_) return std::make_pair(true,(double) i);
  //need to substract 1 because checking on upper edges
  else return std::make_pair(true,(double)i-1);
}

CachingVariable::evalType VariablePower::eval( const edm::Event & iEvent) const {
  const CachingVariable * var=edm::Service<VariableHelperService>()->get().variable(var_);
  if (!var->compute(iEvent)) return std::make_pair(false,0);

  double v=(*var)(iEvent);
  double p=exp(power_*log(v));
  return std::make_pair(true,p);
}

VariableComputer::VariableComputer(CachingVariable::CachingVariableFactoryArg arg) : arg_(arg) {
  if (arg_.iConfig.exists("separator")) separator_ = arg_.iConfig.getParameter<std::string>("separator");
  else separator_ ="_";
  
  name_=arg_.n;
  method_ = arg_.iConfig.getParameter<std::string>("computer");
}

void VariableComputer::declare(std::string var){
  std::string aName = name_+separator_+var;
  ComputedVariable * newVar = new ComputedVariable(method_,aName,arg_.iConfig,this);
  if (iCompute_.find(var) != iCompute_.end()){
    edm::LogError("VariableComputer")<<"redeclaring: "<<var<<" skipping.";
    delete newVar;
    return;
  }
  iCompute_[var] = newVar;
  arg_.m.insert(std::make_pair(aName,newVar));
}
void VariableComputer::assign(std::string var, double & value) const{
  std::map<std::string ,const ComputedVariable *>::const_iterator it=iCompute_.find(var);
  if (it == iCompute_.end()){
    std::stringstream ss;
    ss<<"cannot assign: "<<var<<". List of variable declared:\n";
    for ( std::map<std::string ,const ComputedVariable *>::const_iterator it=iCompute_.begin(); it!=iCompute_.end();++it)
      ss<<it->first<<std::endl;
    edm::LogError("VariableComputer")<<ss.str();
  }
  else
    it->second->setCache(value);
}

void VariableComputer::doesNotCompute() const{
  for ( std::map<std::string ,const ComputedVariable *>::const_iterator it=iCompute_.begin(); it!=iCompute_.end();++it)
    it->second->setNotCompute();
}
void VariableComputer::doesNotCompute(std::string var) const{
  std::map<std::string ,const ComputedVariable *>::const_iterator it=iCompute_.find(var);
  if (it == iCompute_.end()){
    std::stringstream ss;
    ss<<"cannot act on: "<<var<<". List of variable declared:\n";
    for ( std::map<std::string ,const ComputedVariable *>::const_iterator it=iCompute_.begin(); it!=iCompute_.end();++it)
      ss<<it->first<<std::endl;
    edm::LogError("VariableComputer")<<ss.str();
  }
  else
    it->second->setNotCompute();
}


ComputedVariable::ComputedVariable(CachingVariableFactoryArg arg ) : 
  CachingVariable("ComputedVariable",arg.n,arg.iConfig){
  // instanciate the computer
    std::string computerType = arg.iConfig.getParameter<std::string>("computer");
    myComputer = VariableComputerFactory::get()->create(computerType,arg);
    //there is a memory leak here, because the object we are in is not register anywhere. since it happens once per job, this is not a big deal.
}

VariableComputerTest::VariableComputerTest(CachingVariable::CachingVariableFactoryArg arg) : VariableComputer(arg){
  declare("toto");
  declare("tutu");
  declare("much");
}

void VariableComputerTest::compute(const edm::Event & iEvent) const{
  //does some mumbo jumbo with the event.
  // computes a bunch of doubles
  double toto = 3;
  double tutu = 4;
  
  //set the  variables  value (which do as if they had been cached)
  assign("toto",toto);
  assign("tutu",tutu);
  doesNotCompute("much");
}