// -*- C++ -*-

/**
 *  @file   EC_Negation_Filter.h
 *
 *  @author Carlos O'Ryan (coryan@cs.wustl.edu)
 *
 * Based on previous work by Tim Harrison (harrison@cs.wustl.edu) and
 * other members of the DOC group. More details can be found in:
 *
 * http://doc.ece.uci.edu/~coryan/EC/index.html
 */

#ifndef TAO_EC_NEGATION_FILTER_H
#define TAO_EC_NEGATION_FILTER_H
#include /**/ "ace/pre.h"

#include "orbsvcs/Event/EC_Filter.h"
#include /**/ "orbsvcs/Event/event_serv_export.h"

#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

TAO_BEGIN_VERSIONED_NAMESPACE_DECL

/**
 * @class TAO_EC_Negation_Filter
 *
 * @brief The negation filter.
 *
 * This filter accepts all the events rejected by its child, and
 * rejects any events accepted by the child.
 *
 * <H2>Memory Management</H2>
 * It assumes ownership of its child.
 */
class TAO_RTEvent_Serv_Export TAO_EC_Negation_Filter : public TAO_EC_Filter
{
public:
  /// Constructor. It assumes ownership of the child.
  TAO_EC_Negation_Filter (TAO_EC_Filter* child);

  /// Destructor
  virtual ~TAO_EC_Negation_Filter ();


  // = The TAO_EC_Filter methods, please check the documentation in
  // TAO_EC_Filter.
  virtual ChildrenIterator begin () const;
  virtual ChildrenIterator end () const;
  virtual int size () const;
  virtual int filter (const RtecEventComm::EventSet& event,
                      TAO_EC_QOS_Info& qos_info);
  virtual int filter_nocopy (RtecEventComm::EventSet& event,
                             TAO_EC_QOS_Info& qos_info);
  virtual void push (const RtecEventComm::EventSet& event,
                     TAO_EC_QOS_Info& qos_info);
  virtual void push_nocopy (RtecEventComm::EventSet& event,
                            TAO_EC_QOS_Info& qos_info);
  virtual void clear ();
  virtual CORBA::ULong max_event_size () const;
  virtual int can_match (const RtecEventComm::EventHeader& header) const;
  virtual int add_dependencies (const RtecEventComm::EventHeader& header,
                                const TAO_EC_QOS_Info &qos_info);

private:
  TAO_EC_Negation_Filter (const TAO_EC_Negation_Filter&);
  TAO_EC_Negation_Filter& operator= (const TAO_EC_Negation_Filter&);

private:
  /// The child
  TAO_EC_Filter* child_;
};

TAO_END_VERSIONED_NAMESPACE_DECL

#include /**/ "ace/post.h"
#endif /* TAO_EC_NEGATION_FILTER_H */
