AggMemberDatasetSharedDDSWrapper.h

// This file is part of the "NcML Module" project, a BES module designed
// to allow NcML files to be used to be used as a wrapper to add
// AIS to existing datasets of any format.
//
// Copyright (c) 2010 OPeNDAP, Inc.
// Author: Michael Johnson  <m.johnson@opendap.org>
//
// For more information, please also see the main website: http://opendap.org/
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// Please see the files COPYING and COPYRIGHT for more information on the GLPL.
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
#ifndef __AGG_UTIL__AGG_MEMBER_DATASET_SHARED_DDS_WRAPPER_H__
#define __AGG_UTIL__AGG_MEMBER_DATASET_SHARED_DDS_WRAPPER_H__
 
#include "AggMemberDatasetWithDimensionCacheBase.h" // super
 
namespace agg_util
{
  // fdecls
  class DDSAccessRCInterface;

  class AggMemberDatasetSharedDDSWrapper : public AggMemberDatasetWithDimensionCacheBase
  {
  public:
    AggMemberDatasetSharedDDSWrapper();
    explicit AggMemberDatasetSharedDDSWrapper(const DDSAccessRCInterface* pDDSHolder);
    ~AggMemberDatasetSharedDDSWrapper() override;
 
    AggMemberDatasetSharedDDSWrapper(const AggMemberDatasetSharedDDSWrapper& proto);
    AggMemberDatasetSharedDDSWrapper& operator=(const AggMemberDatasetSharedDDSWrapper& that);

    const libdap::DDS* getDDS() override;
 
  private:
 
      // If _pDDSHolder, unref() and null it.
      void cleanup() noexcept;
 
      // If rhs._pDDSHodler, we ref() it
      // and maintain an alias ourselves.
      // ASSUMES: !_pDDSHolder
      void copyRepFrom(const AggMemberDatasetSharedDDSWrapper& rhs);
 
      // data rep
 
      // Invariant: If not-null, we maintain a strong ref() to it
      // and unref() in cleanup().
      const DDSAccessRCInterface* _pDDSHolder {nullptr};
 
  }; // class AggMemberDatasetSharedDDSWrapper
 
} // namespace agg_util
 
#endif /* __AGG_UTIL__AGG_MEMBER_DATASET_SHARED_DDS_WRAPPER_H__ */