#ifndef HISTORYSELECTOR_HPP
#define HISTORYSELECTOR_HPP
//
// $Id: HistorySelector.hpp,v 1.5 2006/02/16 05:32:04 greenlee Exp $
//
// File: HistorySelector.hpp
// Purpose: Selector for HistoryChunk.  This selector can be used in 
//          conjunction with edm::TKey to select history chunks for a 
//          given program and/or version.  E.g.:
//
//          TKey<HistoryChunk> key(HistorySelector("MyProgram"));
//          list<THandle<HistoryChunk> > hlist = key.findAll();
//
//          Leaving the program or version blank turns off selection based
//          on that attribute.  (A default-constructed HistorySelector does
//          nothing.)
//          
//
// Created: 29-Mar-2000   Herb Greenlee
//
// $Revision: 1.5 $
//
//

#include <string>
#include "edm/AbsSelector.hpp"

namespace edm {class Event;}

namespace fwk {

  class HistorySelector : public edm::AbsSelector
  {
  public:

    // Static methods

    static bool is_monte_carlo(const edm::Event& event);
    static bool is_run2b(const edm::Event& event);
    static bool is_run2a(const edm::Event& event) {return !is_run2b(event);}

    // Constructors/destructor.

    HistorySelector(const HistorySelector& hs);
    HistorySelector(const std::string& program="", 
		    const std::string& prod_version="");
    ~HistorySelector() {}

    // AbsSelector overrides.

    bool match(const edm::AbsChunk&) const;
    edm::AbsSelector* clone() const {return new HistorySelector(*this);}

  private:

    // Data

    std::string _program;
    std::string _prod_version;
  };
}

#endif