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/******************************************************************************
* $Id: ogrlayerpool.h 24642 2012-07-01 20:45:46Z rouault $
*
* Project: OpenGIS Simple Features Reference Implementation
* Purpose: Defines OGRLayerPool and OGRProxiedLayer class
* Author: Even Rouault, even dot rouault at mines dash paris dot org
*
******************************************************************************
* Copyright (c) 2012, Even Rouault <even dot rouault at mines dash paris dot org>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#ifndef _OGRLAYERPOOL_H_INCLUDED
#define _OGRLAYERPOOL_H_INCLUDED
#include "ogrsf_frmts.h"
typedef OGRLayer* (*OpenLayerFunc)(void* user_data);
typedef void (*FreeUserDataFunc)(void* user_data);
class OGRLayerPool;
/************************************************************************/
/* OGRAbstractProxiedLayer */
/************************************************************************/
class OGRAbstractProxiedLayer : public OGRLayer
{
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:
OGRAbstractProxiedLayer(OGRLayerPool* poPool);
virtual ~OGRAbstractProxiedLayer();
};
/************************************************************************/
/* OGRLayerPool */
/************************************************************************/
class 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:
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 OGRProxiedLayer : public OGRAbstractProxiedLayer
{
OpenLayerFunc pfnOpenLayer;
FreeUserDataFunc pfnFreeUserData;
void *pUserData;
OGRLayer *poUnderlyingLayer;
OGRFeatureDefn *poFeatureDefn;
OGRSpatialReference *poSRS;
int OpenUnderlyingLayer();
protected:
virtual void CloseUnderlyingLayer();
public:
OGRProxiedLayer(OGRLayerPool* poPool,
OpenLayerFunc pfnOpenLayer,
FreeUserDataFunc pfnFreeUserData,
void* pUserData);
virtual ~OGRProxiedLayer();
virtual OGRGeometry *GetSpatialFilter();
virtual void SetSpatialFilter( OGRGeometry * );
virtual OGRErr SetAttributeFilter( const char * );
virtual void ResetReading();
virtual OGRFeature *GetNextFeature();
virtual OGRErr SetNextByIndex( long nIndex );
virtual OGRFeature *GetFeature( long nFID );
virtual OGRErr SetFeature( OGRFeature *poFeature );
virtual OGRErr CreateFeature( OGRFeature *poFeature );
virtual OGRErr DeleteFeature( long nFID );
virtual const char *GetName();
virtual OGRwkbGeometryType GetGeomType();
virtual OGRFeatureDefn *GetLayerDefn();
virtual OGRSpatialReference *GetSpatialRef();
virtual int GetFeatureCount( int bForce = TRUE );
virtual OGRErr GetExtent(OGREnvelope *psExtent, int bForce = TRUE);
virtual int TestCapability( const char * );
/* Deprecated (and un-implemented method) --> we won't decorate it ! */
/* virtual const char *GetInfo( const char * ); */
virtual OGRErr CreateField( OGRFieldDefn *poField,
int bApproxOK = TRUE );
virtual OGRErr DeleteField( int iField );
virtual OGRErr ReorderFields( int* panMap );
virtual OGRErr AlterFieldDefn( int iField, OGRFieldDefn* poNewFieldDefn, int nFlags );
virtual OGRErr SyncToDisk();
virtual OGRStyleTable *GetStyleTable();
virtual void SetStyleTableDirectly( OGRStyleTable *poStyleTable );
virtual void SetStyleTable(OGRStyleTable *poStyleTable);
virtual OGRErr StartTransaction();
virtual OGRErr CommitTransaction();
virtual OGRErr RollbackTransaction();
virtual const char *GetFIDColumn();
virtual const char *GetGeometryColumn();
virtual OGRErr SetIgnoredFields( const char **papszFields );
};
#endif // _OGRLAYERPOOL_H_INCLUDED
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