ogrunionlayer.h

00001 /******************************************************************************
00002  * $Id: ogrunionlayer.h 27044 2014-03-16 23:41:27Z rouault $
00003  *
00004  * Project:  OpenGIS Simple Features Reference Implementation
00005  * Purpose:  Defines OGRUnionLayer class
00006  * Author:   Even Rouault, even dot rouault at mines dash paris dot org
00007  *
00008  ******************************************************************************
00009  * Copyright (c) 2012-2014, 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 _OGRUNIONLAYER_H_INCLUDED
00031 #define _OGRUNIONLAYER_H_INCLUDED
00032 
00033 #include "ogrsf_frmts.h"
00034 
00035 /************************************************************************/
00036 /*                      OGRUnionLayerGeomFieldDefn                      */
00037 /************************************************************************/
00038 
00039 class OGRUnionLayerGeomFieldDefn: public OGRGeomFieldDefn
00040 {
00041     public:
00042 
00043     int             bGeomTypeSet;
00044     int             bSRSSet;
00045     OGREnvelope     sStaticEnvelope;
00046 
00047             OGRUnionLayerGeomFieldDefn(const char* pszName, OGRwkbGeometryType eType);
00048             OGRUnionLayerGeomFieldDefn(OGRGeomFieldDefn* poSrc);
00049             OGRUnionLayerGeomFieldDefn(OGRUnionLayerGeomFieldDefn* poSrc);
00050            ~OGRUnionLayerGeomFieldDefn();
00051 };
00052 
00053 /************************************************************************/
00054 /*                         OGRUnionLayer                                */
00055 /************************************************************************/
00056 
00057 typedef enum
00058 {
00059     FIELD_FROM_FIRST_LAYER,
00060     FIELD_UNION_ALL_LAYERS,
00061     FIELD_INTERSECTION_ALL_LAYERS,
00062     FIELD_SPECIFIED,
00063 } FieldUnionStrategy;
00064 
00065 class OGRUnionLayer : public OGRLayer
00066 {
00067   protected:
00068     CPLString           osName;
00069     int                 nSrcLayers;
00070     OGRLayer          **papoSrcLayers;
00071     int                 bHasLayerOwnership;
00072 
00073     OGRFeatureDefn     *poFeatureDefn;
00074     int                 nFields;
00075     OGRFieldDefn      **papoFields;
00076     int                 nGeomFields;
00077     OGRUnionLayerGeomFieldDefn **papoGeomFields;
00078     FieldUnionStrategy eFieldStrategy;
00079     CPLString           osSourceLayerFieldName;
00080 
00081     int                 bPreserveSrcFID;
00082 
00083     int                 nFeatureCount;
00084 
00085     int                 iCurLayer;
00086     char               *pszAttributeFilter;
00087     int                 nNextFID;
00088     int                *panMap;
00089     char              **papszIgnoredFields;
00090     int                 bAttrFilterPassThroughValue;
00091     int                *pabModifiedLayers;
00092     int                *pabCheckIfAutoWrap;
00093     OGRSpatialReference *poGlobalSRS;
00094 
00095     void                AutoWarpLayerIfNecessary(int iSubLayer);
00096     OGRFeature         *TranslateFromSrcLayer(OGRFeature* poSrcFeature);
00097     void                ApplyAttributeFilterToSrcLayer(int iSubLayer);
00098     int                 GetAttrFilterPassThroughValue();
00099     void                ConfigureActiveLayer();
00100     void                SetSpatialFilterToSourceLayer(OGRLayer* poSrcLayer);
00101 
00102   public:
00103                         OGRUnionLayer( const char* pszName,
00104                                        int nSrcLayers, /* must be >= 1 */
00105                                        OGRLayer** papoSrcLayers, /* array itself ownership always transfered, layer ownership depending on bTakeLayerOwnership */
00106                                        int bTakeLayerOwnership);
00107 
00108     virtual             ~OGRUnionLayer();
00109 
00110     /* All the following non virtual methods must be called just after the constructor */
00111     /* and before any virtual method */
00112     void                SetFields(FieldUnionStrategy eFieldStrategy,
00113                                   int nFields,
00114                                   OGRFieldDefn** papoFields,  /* duplicated by the method */
00115                                   int nGeomFields, /* maybe -1 to explicitely disable geometry fields */
00116                                   OGRUnionLayerGeomFieldDefn** papoGeomFields  /* duplicated by the method */);
00117     void                SetSourceLayerFieldName(const char* pszSourceLayerFieldName);
00118     void                SetPreserveSrcFID(int bPreserveSrcFID);
00119     void                SetFeatureCount(int nFeatureCount);
00120     virtual const char  *GetName() { return osName.c_str(); }
00121     virtual OGRwkbGeometryType GetGeomType();
00122 
00123     virtual void        ResetReading();
00124     virtual OGRFeature *GetNextFeature();
00125 
00126     virtual OGRFeature *GetFeature( long nFeatureId );
00127 
00128     virtual OGRErr      CreateFeature( OGRFeature* poFeature );
00129 
00130     virtual OGRErr      SetFeature( OGRFeature* poFeature );
00131 
00132     virtual OGRFeatureDefn *GetLayerDefn();
00133 
00134     virtual OGRSpatialReference *GetSpatialRef();
00135 
00136     virtual int         GetFeatureCount( int );
00137 
00138     virtual OGRErr      SetAttributeFilter( const char * );
00139 
00140     virtual int         TestCapability( const char * );
00141 
00142     virtual OGRErr      GetExtent(int iGeomField, OGREnvelope *psExtent, int bForce = TRUE);
00143     virtual OGRErr      GetExtent( OGREnvelope *psExtent, int bForce );
00144 
00145     virtual void        SetSpatialFilter( OGRGeometry * poGeomIn );
00146     virtual void        SetSpatialFilter( int iGeomField, OGRGeometry * );
00147 
00148     virtual OGRErr      SetIgnoredFields( const char **papszFields );
00149 
00150     virtual OGRErr      SyncToDisk();
00151 };
00152 
00153 #endif // _OGRUNIONLAYER_H_INCLUDED

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