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/* -*- C++ -*- */
/**
* @file EC_Filter_Builder.h
*
* $Id$
*
* @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_FILTER_BUILDER_H
#define TAO_EC_FILTER_BUILDER_H
#include /**/ "ace/pre.h"
#include "orbsvcs/RtecEventChannelAdminC.h"
#include /**/ "event_export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
class TAO_EC_Filter;
class TAO_EC_ProxyPushSupplier;
/**
* @class TAO_EC_Filter_Builder
*
* @brief Abstract base class for the filter builders.
*
* The creation of a filter hierarchy is controlled by a
* Filter_Builder. The relationship between TAO_EC_Filter and
* TAO_EC_Filter_Builder follows the "Builder Pattern" (Gamma et
* al.)
*/
class TAO_RTEvent_Export TAO_EC_Filter_Builder
{
public:
/// destructor...
virtual ~TAO_EC_Filter_Builder (void);
/// Create the filter, the caller must assume ownership of the filter
/// returned.
virtual TAO_EC_Filter*
build (TAO_EC_ProxyPushSupplier *supplier,
RtecEventChannelAdmin::ConsumerQOS& qos
ACE_ENV_ARG_DECL) const = 0;
};
// ****************************************************************
/**
* @class TAO_EC_Null_Filter_Builder
*
* @brief A simple implementation of the filter builder.
*
* Simply creates a Null_Filter in every case.
*/
class TAO_RTEvent_Export TAO_EC_Null_Filter_Builder : public TAO_EC_Filter_Builder
{
public:
/// constructor.
TAO_EC_Null_Filter_Builder (void);
/// destructor...
virtual ~TAO_EC_Null_Filter_Builder (void);
// = The TAO_EC_Filter_Builder methods...
TAO_EC_Filter* build (TAO_EC_ProxyPushSupplier *supplier,
RtecEventChannelAdmin::ConsumerQOS& qos
ACE_ENV_ARG_DECL) const;
};
// ****************************************************************
#if defined (__ACE_INLINE__)
#include "EC_Filter_Builder.i"
#endif /* __ACE_INLINE__ */
#include /**/ "ace/post.h"
#endif /* TAO_EC_FILTER_BUILDER_H */
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