LabelProvider.h

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#ifndef OSMSCOUT_LABELPROVIDER_H
#define OSMSCOUT_LABELPROVIDER_H
 
/*
  This source is part of the libosmscout library
  Copyright (C) 2017  Tim Teulings
 
  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., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
*/
 
#include <vector>
 
#include <osmscoutmap/MapImportExport.h>
 
#include <osmscout/TypeConfig.h>
 
#include <osmscoutmap/MapParameter.h>
 
namespace osmscout {

  class OSMSCOUT_MAP_API LabelProvider
  {
  public:
    virtual ~LabelProvider() = default;

    virtual std::string GetLabel(const MapParameter& parameter,
                                 const FeatureValueBuffer& buffer) const = 0;

    virtual std::string GetName() const = 0;
  };
 
  using LabelProviderRef = std::shared_ptr<LabelProvider>;

  class OSMSCOUT_MAP_API LabelProviderFactory
  {
  public:
    virtual ~LabelProviderFactory() = default;
 
    virtual LabelProviderRef Create(const TypeConfig& typeConfig) const = 0;
  };
 
  using LabelProviderFactoryRef = std::shared_ptr<LabelProviderFactory>;

  class OSMSCOUT_MAP_API INameLabelProviderFactory : public LabelProviderFactory
  {
  private:
    class INameLabelProvider : public LabelProvider
    {
    private:
      std::vector<size_t> nameLookupTable;
      std::vector<size_t> nameAltLookupTable;
 
    public:
      explicit INameLabelProvider(const TypeConfig& typeConfig);
 
      std::string GetLabel(const MapParameter& parameter,
                           const FeatureValueBuffer& buffer) const override;
 
      inline std::string GetName() const override
      {
        return "IName";
      }
    };
 
    private:
      mutable LabelProviderRef instance;
 
    public:
      LabelProviderRef Create(const TypeConfig& typeConfig) const override;
  };

  class OSMSCOUT_MAP_API DynamicFeatureLabelReader : public LabelProvider
  {
  private:
    std::vector<size_t> lookupTable;
    std::string         featureName;
    std::string         labelName;
    size_t              labelIndex;
 
  public:
    DynamicFeatureLabelReader(const TypeConfig& typeConfig,
                              const std::string& featureName,
                              const std::string& labelName);
 
    std::string GetLabel(const MapParameter& parameter,
                         const FeatureValueBuffer& buffer) const override;
 
    inline std::string GetName() const override
    {
      return featureName + "." + labelName;
    }
  };
}
 
#endif