/******************************************************************************

 *

 * Project:  OpenGIS Simple Features Reference Implementation

 * Purpose:  Defines OGRLayerPool and OGRProxiedLayer class

 * Author:   Even Rouault, even dot rouault at spatialys.com

 *

 ******************************************************************************

 * Copyright (c) 2012-2013, Even Rouault <even dot rouault at spatialys.com>

 *

 * SPDX-License-Identifier: MIT

 ****************************************************************************/

#ifndef OGRLAYERPOOL_H_INCLUDED

#define OGRLAYERPOOL_H_INCLUDED

#ifndef DOXYGEN_SKIP

#include "ogrsf_frmts.h"

#include <mutex>

typedef OGRLayer *(*OpenLayerFunc)(void *user_data);

typedef void (*ReleaseLayerFunc)(OGRLayer *, void *user_data);

typedef void (*FreeUserDataFunc)(void *user_data);

class OGRLayerPool;

/************************************************************************/

/*                      OGRAbstractProxiedLayer                         */

/************************************************************************/

class CPL_DLL OGRAbstractProxiedLayer : public OGRLayer

{

    CPL_DISALLOW_COPY_ASSIGN(OGRAbstractProxiedLayer)

    friend class OGRLayerPool;

    OGRAbstractProxiedLayer

        *poPrevLayer; /* Chain to a layer that was used more recently */

    OGRAbstractProxiedLayer

        *poNextLayer; /* Chain to a layer that was used less recently */

  protected:

    OGRLayerPool *poPool;

    virtual void CloseUnderlyingLayer() = 0;

  public:

    explicit OGRAbstractProxiedLayer(OGRLayerPool *poPool);

    ~OGRAbstractProxiedLayer() override;

};

/************************************************************************/

/*                             OGRLayerPool                             */

/************************************************************************/

class CPL_DLL OGRLayerPool

{

    CPL_DISALLOW_COPY_ASSIGN(OGRLayerPool)

  protected:

    OGRAbstractProxiedLayer *poMRULayer; /* the most recently used layer */

    OGRAbstractProxiedLayer

        *poLRULayer;  /* the least recently used layer (still opened) */

    int nMRUListSize; /* the size of the list */

    int nMaxSimultaneouslyOpened;

  public:

    explicit OGRLayerPool(int nMaxSimultaneouslyOpened = 100);

    ~OGRLayerPool();

    void SetLastUsedLayer(OGRAbstractProxiedLayer *poProxiedLayer);

    void UnchainLayer(OGRAbstractProxiedLayer *poProxiedLayer);

    int GetMaxSimultaneouslyOpened() const

    {

        return nMaxSimultaneouslyOpened;

    }

    int GetSize() const

    {

        return nMRUListSize;

    }

};

/************************************************************************/

/*                           OGRProxiedLayer                            */

/************************************************************************/

class CPL_DLL OGRProxiedLayer : public OGRAbstractProxiedLayer

{

    CPL_DISALLOW_COPY_ASSIGN(OGRProxiedLayer)

    OpenLayerFunc pfnOpenLayer;

    ReleaseLayerFunc pfnReleaseLayer;

    FreeUserDataFunc pfnFreeUserData;

    void *pUserData;

    mutable OGRLayer *poUnderlyingLayer;

    mutable OGRFeatureDefn *poFeatureDefn;

    mutable OGRSpatialReference *poSRS;

    mutable std::recursive_mutex m_oMutex{};

    int OpenUnderlyingLayer() const;

  protected:

    void CloseUnderlyingLayer() override;

  public:

    OGRProxiedLayer(OGRLayerPool *poPool, OpenLayerFunc pfnOpenLayer,

                    FreeUserDataFunc pfnFreeUserData, void *pUserData);

    OGRProxiedLayer(OGRLayerPool *poPool, OpenLayerFunc pfnOpenLayer,

                    ReleaseLayerFunc pfnReleaseLayer,

                    FreeUserDataFunc pfnFreeUserData, void *pUserData);

    ~OGRProxiedLayer() override;

    OGRLayer *GetUnderlyingLayer();

    OGRGeometry *GetSpatialFilter() override;

    virtual OGRErr ISetSpatialFilter(int iGeomField,

                                     const OGRGeometry *) override;

    OGRErr SetAttributeFilter(const char *) override;

    void ResetReading() override;

    OGRFeature *GetNextFeature() override;

    OGRErr SetNextByIndex(GIntBig nIndex) override;

    OGRFeature *GetFeature(GIntBig nFID) override;

    OGRErr ISetFeature(OGRFeature *poFeature) override;

    OGRErr ICreateFeature(OGRFeature *poFeature) override;

    OGRErr IUpsertFeature(OGRFeature *poFeature) override;

    OGRErr IUpdateFeature(OGRFeature *poFeature, int nUpdatedFieldsCount,

                          const int *panUpdatedFieldsIdx,

                          int nUpdatedGeomFieldsCount,

                          const int *panUpdatedGeomFieldsIdx,

                          bool bUpdateStyleString) override;

    OGRErr DeleteFeature(GIntBig nFID) override;

    GDALDataset *GetDataset() override;

    virtual bool GetArrowStream(struct ArrowArrayStream *out_stream,

                                CSLConstList papszOptions = nullptr) override;

    const char *GetName() const override;

    OGRwkbGeometryType GetGeomType() const override;

    const OGRFeatureDefn *GetLayerDefn() const override;

    const OGRSpatialReference *GetSpatialRef() const override;

    GIntBig GetFeatureCount(int bForce = TRUE) override;

    OGRErr IGetExtent(int iGeomField, OGREnvelope *psExtent,

                      bool bForce) override;

    int TestCapability(const char *) const override;

    virtual OGRErr CreateField(const OGRFieldDefn *poField,

                               int bApproxOK = TRUE) override;

    OGRErr DeleteField(int iField) override;

    OGRErr ReorderFields(int *panMap) override;

    virtual OGRErr AlterFieldDefn(int iField, OGRFieldDefn *poNewFieldDefn,

                                  int nFlags) override;

    virtual OGRErr

    AlterGeomFieldDefn(int iGeomField,

                       const OGRGeomFieldDefn *poNewGeomFieldDefn,

                       int nFlags) override;

    OGRErr SyncToDisk() override;

    OGRStyleTable *GetStyleTable() override;

    void SetStyleTableDirectly(OGRStyleTable *poStyleTable) override;

    void SetStyleTable(OGRStyleTable *poStyleTable) override;

    OGRErr StartTransaction() override;

    OGRErr CommitTransaction() override;

    OGRErr RollbackTransaction() override;

    const char *GetFIDColumn() const override;

    const char *GetGeometryColumn() const override;

    OGRErr SetIgnoredFields(CSLConstList papszFields) override;

    OGRErr Rename(const char *pszNewName) override;

};

#endif /* #ifndef DOXYGEN_SKIP */

#endif  // OGRLAYERPOOL_H_INCLUDED