EntityTag.h

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#ifndef OV_ENTITY_TAG_H
#define OV_ENTITY_TAG_H

#include <string>

class GenericDataBase;
class aString;

class EntityTag {

public:
  EntityTag( const std::string name="", const void *data=0, const bool copy_data=false, const int data_size=0 )
    : tagName(""), tagData(0), copyData(false) , dataSize(0)
  { this->setData( name , data, copy_data, data_size ); }
  
  EntityTag( const EntityTag & et ) : tagName(""), tagData(0), copyData(false) , dataSize(0)
  { this->setData( et.tagName , et.tagData, et.copyData, et.dataSize ); }

  virtual ~EntityTag() 
  { destroy(); }

  inline bool is_nil() const { return tagName=="" && tagData==0; }

  virtual int setData( const std::string name, const void *data, const bool copy_data=false, const int data_size=0 );
  virtual int getData( void * &data, std::string &name );
  virtual const void * getData() const { return tagData; }
  virtual int getDataSize() const { return dataSize; }
  bool copiesData() const { return copyData; }
  
  std::string getName() const { return tagName; }
  virtual std::string getClassName() const { return className; }

  virtual int get( const GenericDataBase & dir, const aString & name );    // get from a database file
  virtual int put( GenericDataBase & dir, const aString & name) const;    // put to a database file
  
protected:
  void destroy() 
  {
    if ( tagData && copyData )
      delete [] (char *)tagData;

    dataSize = 0;
    tagData = 0;
  }

private:
  
  static std::string className;
  std::string tagName;

  void *tagData;
  bool copyData;
  int dataSize;
  
};

#endif