tr_header_context.hpp

/* tr_header_context.hpp */
/* $Id$ */
#ifndef __tr_header_context_hpp
#define __tr_header_context_hpp

#include <string>
#include <vector>

namespace hds
{
  namespace db
  {
    enum TrHeaderAttrId
      {
#define __HDR_ATTR(id, type, length, has_key) id,
#include "tr_header_attributes.def"
#undef  __HDR_ATTR
      };
    
    enum TrHeaderAttrType
      {
    TAT_CHAR,     
    TAT_INT,      
    TAT_FLOAT,    
    TAT_DOUBLE,   
    TAT_UNDEFINED 
      };

    std::string toString(TrHeaderAttrType type);
    
    class TrHeaderContext
    {
    public:
      
      struct AttrContext
      {
    AttrContext(): id(TA_NMGL), type(TAT_CHAR), length(0), 
               size(0), has_key(false), offset(0) 
    {/* Nothing to do. */}
    
    bool isDummy() {return (0 == size);}
    
    TrHeaderAttrId id;      
    TrHeaderAttrType type;  
    std::string name;       
    size_t length;          
    size_t size;            
    bool has_key;           
    size_t offset;          
      };
      
      
      TrHeaderContext();
      
      
      size_t size() const;
      
      const AttrContext& operator()(const size_t id) const;
      
      
      size_t getDataSize() const;
      
    private:
      
      size_t calc_header_data_size() const;
      
      std::vector<AttrContext> prepare_attr_context() const;
    };
  }; // db
}; // hds

#endif /* tr_header_context.hpp */