ogrunionlayer.h

/******************************************************************************
 * $Id$
 *
 * Project:  OpenGIS Simple Features Reference Implementation
 * Purpose:  Defines OGRUnionLayer class
 * Author:   Even Rouault, even dot rouault at spatialys.com
 *
 ******************************************************************************
 * Copyright (c) 2012-2014, Even Rouault <even dot rouault at spatialys.com>
 *
 * 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 OGRUNIONLAYER_H_INCLUDED
#define OGRUNIONLAYER_H_INCLUDED
 
#ifndef DOXYGEN_SKIP
 
#include "ogrsf_frmts.h"
 
/************************************************************************/
/*                      OGRUnionLayerGeomFieldDefn                      */
/************************************************************************/
 
class CPL_DLL OGRUnionLayerGeomFieldDefn final : public OGRGeomFieldDefn
{
  public:
    int bGeomTypeSet = false;
    int bSRSSet = false;
    OGREnvelope sStaticEnvelope{};
 
    OGRUnionLayerGeomFieldDefn(const char *pszName, OGRwkbGeometryType eType);
    explicit OGRUnionLayerGeomFieldDefn(const OGRGeomFieldDefn *poSrc);
    explicit OGRUnionLayerGeomFieldDefn(
        const OGRUnionLayerGeomFieldDefn *poSrc);
    ~OGRUnionLayerGeomFieldDefn();
};
 
/************************************************************************/
/*                         OGRUnionLayer                                */
/************************************************************************/
 
typedef enum
{
    FIELD_FROM_FIRST_LAYER,
    FIELD_UNION_ALL_LAYERS,
    FIELD_INTERSECTION_ALL_LAYERS,
    FIELD_SPECIFIED,
} FieldUnionStrategy;
 
class CPL_DLL OGRUnionLayer final : public OGRLayer
{
    CPL_DISALLOW_COPY_ASSIGN(OGRUnionLayer)
 
  protected:
    CPLString osName;
    int nSrcLayers;
    OGRLayer **papoSrcLayers;
    int bHasLayerOwnership;
 
    OGRFeatureDefn *poFeatureDefn;
    int nFields;
    OGRFieldDefn **papoFields;
    int nGeomFields;
    OGRUnionLayerGeomFieldDefn **papoGeomFields;
    FieldUnionStrategy eFieldStrategy;
    CPLString osSourceLayerFieldName{};
 
    int bPreserveSrcFID;
 
    GIntBig nFeatureCount;
 
    int iCurLayer;
    char *pszAttributeFilter;
    int nNextFID;
    int *panMap;
    char **papszIgnoredFields;
    int bAttrFilterPassThroughValue;
    int *pabModifiedLayers;
    int *pabCheckIfAutoWrap;
    OGRSpatialReference *poGlobalSRS;
 
    void AutoWarpLayerIfNecessary(int iSubLayer);
    OGRFeature *TranslateFromSrcLayer(OGRFeature *poSrcFeature);
    void ApplyAttributeFilterToSrcLayer(int iSubLayer);
    int GetAttrFilterPassThroughValue();
    void ConfigureActiveLayer();
    void SetSpatialFilterToSourceLayer(OGRLayer *poSrcLayer);
 
  public:
    OGRUnionLayer(
        const char *pszName, int nSrcLayers, /* must be >= 1 */
        OGRLayer *
            *papoSrcLayers, /* array itself ownership always transferred, layer
                               ownership depending on bTakeLayerOwnership */
        int bTakeLayerOwnership);
 
    virtual ~OGRUnionLayer();
 
    /* All the following non virtual methods must be called just after the
     * constructor */
    /* and before any virtual method */
    void SetFields(
        FieldUnionStrategy eFieldStrategy, int nFields,
        OGRFieldDefn **papoFields, /* duplicated by the method */
        int nGeomFields, /* maybe -1 to explicitly disable geometry fields */
        OGRUnionLayerGeomFieldDefn *
            *papoGeomFields /* duplicated by the method */);
    void SetSourceLayerFieldName(const char *pszSourceLayerFieldName);
    void SetPreserveSrcFID(int bPreserveSrcFID);
    void SetFeatureCount(int nFeatureCount);
    virtual const char *GetName() override
    {
        return osName.c_str();
    }
    virtual OGRwkbGeometryType GetGeomType() override;
 
    virtual void ResetReading() override;
    virtual OGRFeature *GetNextFeature() override;
 
    virtual OGRFeature *GetFeature(GIntBig nFeatureId) override;
 
    virtual OGRErr ICreateFeature(OGRFeature *poFeature) override;
 
    virtual OGRErr ISetFeature(OGRFeature *poFeature) override;
 
    virtual OGRErr IUpsertFeature(OGRFeature *poFeature) override;
 
    virtual OGRFeatureDefn *GetLayerDefn() override;
 
    virtual OGRSpatialReference *GetSpatialRef() override;
 
    virtual GIntBig GetFeatureCount(int) override;
 
    virtual OGRErr SetAttributeFilter(const char *) override;
 
    virtual int TestCapability(const char *) override;
 
    virtual OGRErr GetExtent(int iGeomField, OGREnvelope *psExtent,
                             int bForce = TRUE) override;
    virtual OGRErr GetExtent(OGREnvelope *psExtent, int bForce) override;
 
    virtual void SetSpatialFilter(OGRGeometry *poGeomIn) override;
    virtual void SetSpatialFilter(int iGeomField, OGRGeometry *) override;
 
    virtual OGRErr SetIgnoredFields(const char **papszFields) override;
 
    virtual OGRErr SyncToDisk() override;
};
 
#endif /* #ifndef DOXYGEN_SKIP */
 
#endif  // OGRUNIONLAYER_H_INCLUDED