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# ogrlayerpool.h

    00001 /******************************************************************************
    00002  * $Id: ogrlayerpool.h 28375 2015-01-30 12:06:11Z rouault $
    00003  *
    00004  * Project:  OpenGIS Simple Features Reference Implementation
    00005  * Purpose:  Defines OGRLayerPool and OGRProxiedLayer class
    00006  * Author:   Even Rouault, even dot rouault at mines dash paris dot org
    00007  *
    00008  ******************************************************************************
    00009  * Copyright (c) 2012-2013, Even Rouault <even dot rouault at mines-paris dot org>
    00010  *
    00011  * Permission is hereby granted, free of charge, to any person obtaining a
    00012  * copy of this software and associated documentation files (the "Software"),
    00013  * to deal in the Software without restriction, including without limitation
    00014  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
    00015  * and/or sell copies of the Software, and to permit persons to whom the
    00016  * Software is furnished to do so, subject to the following conditions:
    00017  *
    00018  * The above copyright notice and this permission notice shall be included
    00019  * in all copies or substantial portions of the Software.
    00020  *
    00021  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    00022  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    00023  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    00024  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    00025  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    00026  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    00027  * DEALINGS IN THE SOFTWARE.
    00028  ****************************************************************************/
    00029
    00030 #ifndef _OGRLAYERPOOL_H_INCLUDED
    00031 #define _OGRLAYERPOOL_H_INCLUDED
    00032
    00033 #include "ogrsf_frmts.h"
    00034
    00035 typedef OGRLayer* (*OpenLayerFunc)(void* user_data);
    00036 typedef void      (*FreeUserDataFunc)(void* user_data);
    00037
    00038 class OGRLayerPool;
    00039
    00040 /************************************************************************/
    00041 /*                      OGRAbstractProxiedLayer                         */
    00042 /************************************************************************/
    00043
    00044 class OGRAbstractProxiedLayer : public OGRLayer
    00045 {
    00046         friend class OGRLayerPool;
    00047
    00048         OGRAbstractProxiedLayer   *poPrevLayer; /* Chain to a layer that was used more recently */
    00049         OGRAbstractProxiedLayer   *poNextLayer; /* Chain to a layer that was used less recently */
    00050
    00051     protected:
    00052         OGRLayerPool              *poPool;
    00053
    00054         virtual void    CloseUnderlyingLayer() = 0;
    00055
    00056     public:
    00057                         OGRAbstractProxiedLayer(OGRLayerPool* poPool);
    00058         virtual        ~OGRAbstractProxiedLayer();
    00059 };
    00060
    00061 /************************************************************************/
    00062 /*                             OGRLayerPool                             */
    00063 /************************************************************************/
    00064
    00065 class OGRLayerPool
    00066 {
    00067     protected:
    00068         OGRAbstractProxiedLayer *poMRULayer; /* the most recently used layer */
    00069         OGRAbstractProxiedLayer *poLRULayer; /* the least recently used layer (still opened) */
    00070         int                     nMRUListSize; /* the size of the list */
    00071         int                     nMaxSimultaneouslyOpened;
    00072
    00073     public:
    00074                                 OGRLayerPool(int nMaxSimultaneouslyOpened = 100);
    00075                                ~OGRLayerPool();
    00076
    00077         void                    SetLastUsedLayer(OGRAbstractProxiedLayer* poProxiedLayer);
    00078         void                    UnchainLayer(OGRAbstractProxiedLayer* poProxiedLayer);
    00079
    00080         int                     GetMaxSimultaneouslyOpened() const { return nMaxSimultaneouslyOpened; }
    00081         int                     GetSize() const { return nMRUListSize; }
    00082 };
    00083
    00084 /************************************************************************/
    00085 /*                           OGRProxiedLayer                            */
    00086 /************************************************************************/
    00087
    00088 class OGRProxiedLayer : public OGRAbstractProxiedLayer
    00089 {
    00090     OpenLayerFunc       pfnOpenLayer;
    00091     FreeUserDataFunc    pfnFreeUserData;
    00092     void               *pUserData;
    00093     OGRLayer           *poUnderlyingLayer;
    00094     OGRFeatureDefn     *poFeatureDefn;
    00095     OGRSpatialReference *poSRS;
    00096
    00097     int                 OpenUnderlyingLayer();
    00098
    00099   protected:
    00100
    00101     virtual void        CloseUnderlyingLayer();
    00102
    00103   public:
    00104
    00105                         OGRProxiedLayer(OGRLayerPool* poPool,
    00106                                         OpenLayerFunc pfnOpenLayer,
    00107                                         FreeUserDataFunc pfnFreeUserData,
    00108                                         void* pUserData);
    00109     virtual            ~OGRProxiedLayer();
    00110
    00111     OGRLayer           *GetUnderlyingLayer();
    00112
    00113     virtual OGRGeometry *GetSpatialFilter();
    00114     virtual void        SetSpatialFilter( OGRGeometry * );
    00115     virtual void        SetSpatialFilter( int iGeomField, OGRGeometry * );
    00116
    00117     virtual OGRErr      SetAttributeFilter( const char * );
    00118
    00119     virtual void        ResetReading();
    00120     virtual OGRFeature *GetNextFeature();
    00121     virtual OGRErr      SetNextByIndex( GIntBig nIndex );
    00122     virtual OGRFeature *GetFeature( GIntBig nFID );
    00123     virtual OGRErr      ISetFeature( OGRFeature *poFeature );
    00124     virtual OGRErr      ICreateFeature( OGRFeature *poFeature );
    00125     virtual OGRErr      DeleteFeature( GIntBig nFID );
    00126
    00127     virtual const char *GetName();
    00128     virtual OGRwkbGeometryType GetGeomType();
    00129     virtual OGRFeatureDefn *GetLayerDefn();
    00130
    00131     virtual OGRSpatialReference *GetSpatialRef();
    00132
    00133     virtual GIntBig     GetFeatureCount( int bForce = TRUE );
    00134     virtual OGRErr      GetExtent(int iGeomField, OGREnvelope *psExtent, int bForce = TRUE);
    00135     virtual OGRErr      GetExtent(OGREnvelope *psExtent, int bForce = TRUE);
    00136
    00137     virtual int         TestCapability( const char * );
    00138
    00139     virtual OGRErr      CreateField( OGRFieldDefn *poField,
    00140                                      int bApproxOK = TRUE );
    00141     virtual OGRErr      DeleteField( int iField );
    00142     virtual OGRErr      ReorderFields( int* panMap );
    00143     virtual OGRErr      AlterFieldDefn( int iField, OGRFieldDefn* poNewFieldDefn, int nFlags );
    00144
    00145     virtual OGRErr      SyncToDisk();
    00146
    00147     virtual OGRStyleTable *GetStyleTable();
    00148     virtual void        SetStyleTableDirectly( OGRStyleTable *poStyleTable );
    00149
    00150     virtual void        SetStyleTable(OGRStyleTable *poStyleTable);
    00151
    00152     virtual OGRErr      StartTransaction();
    00153     virtual OGRErr      CommitTransaction();
    00154     virtual OGRErr      RollbackTransaction();
    00155
    00156     virtual const char *GetFIDColumn();
    00157     virtual const char *GetGeometryColumn();
    00158
    00159     virtual OGRErr      SetIgnoredFields( const char **papszFields );
    00160 };
    00161
    00162 #endif // _OGRLAYERPOOL_H_INCLUDED

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