JChainReader.hh

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#ifndef __JROOT__JCHAINREADER__
#define __JROOT__JCHAINREADER__

#include "TChain.h"

#include "JROOT/JRootAddress.hh"
#include "JROOT/JTreeParameters.hh"


/**
 * \file
 * TChain reading for template data type.
 * \author mdejong
 */
namespace JROOT {}
namespace JPP { using namespace JROOT; }

namespace JROOT {

  /**
   * Auxiliary class for template TChain reading.
   */
  template<class T>
  class JChainReader : 
    public TChain,
    public JRootAddress<T>,
    public JTreeParameters
  {
  public:
    /**
     * Default constructor.
     *
     * Note that the default TTree parameters are obtained using template method JROOT::getTreeParameters.
     */
    JChainReader() :
      JTreeParameters(JROOT::getTreeParameters<T>())
    {
      configure();
    }

    
    /**
     * Constructor.
     *
     * \param  parameters    parameters of TTree
     */
    JChainReader(const JTreeParameters& parameters) :
      JTreeParameters(parameters)
    {
      configure();
    }

    
    /**
     * Copy constructor.
     *
     * Note that the TTree parameters are copied but not the contents.
     *
     * \param  reader        TChain reader
     */
    JChainReader(const JChainReader<T>& reader) :
      JTreeParameters(reader.getTreeParameters())
    {
      configure();
    }

    
    /**
     * Reset this TChain.
     *
     * This method executes the following steps:
     *    -# TChain::Reset();
     *    -# releases the allocated memory and resets the internal pointer;
     *    -# SetBranchAddress();
     *
     * \param  option        option
     */ 
    void Reset(Option_t* option = NULL)
    {
      TChain::Reset(option);

      this->release();
      
      this->SetBranchAddress(this->getBranchName(), &this->address);
    }


  protected:
    /**
     * Configure this TChain.
     */
    void configure()
    {
      this->SetNameTitle(this->getTreeName(), this->getTreeTitle());

      this->SetBranchAddress(this->getBranchName(), &this->address);
    }
  };
}

#endif