EVOLUTION-MANAGER

Edit File: ogresrijsonreader.cpp

/******************************************************************************
 *
 * Project:  OpenGIS Simple Features Reference Implementation
 * Purpose:  Implementation of OGRESRIJSONReader class (OGR ESRIJSON Driver)
 *           to read ESRI Feature Service REST data
 * Author:   Even Rouault, even dot rouault at mines dash paris dot org
 *
 ******************************************************************************
 * Copyright (c) 2010-2013, Even Rouault <even dot rouault at mines-paris dot org>
 * Copyright (c) 2007, Mateusz Loskot
 * Copyright (c) 2013, Kyle Shannon <kyle at pobox dot 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.
 ****************************************************************************/

#include "cpl_port.h"
#include "ogrgeojsonreader.h"

#include <limits.h>
#include <stddef.h>

#include "cpl_conv.h"
#include "cpl_error.h"
#include "json.h"
// #include "json_object.h"
// #include "json_tokener.h"
#include "ogr_api.h"
#include "ogr_core.h"
#include "ogr_feature.h"
#include "ogr_geometry.h"
#include "ogr_spatialref.h"
#include "ogr_geojson.h"
#include "ogrgeojsonreader.h"
#include "ogrgeojsonutils.h"
// #include "symbol_renames.h"

CPL_CVSID("$Id: ogresrijsonreader.cpp 38620 2017-05-23 09:32:47Z rouault $");

/************************************************************************/
/*                          OGRESRIJSONReader()                         */
/************************************************************************/

OGRESRIJSONReader::OGRESRIJSONReader() :
    poGJObject_(NULL),
    poLayer_(NULL)
{}

/************************************************************************/
/*                         ~OGRESRIJSONReader()                         */
/************************************************************************/

OGRESRIJSONReader::~OGRESRIJSONReader()
{
    if( NULL != poGJObject_ )
    {
        json_object_put(poGJObject_);
    }

poGJObject_ = NULL;
    poLayer_ = NULL;
}

/************************************************************************/
/*                           Parse()                                    */
/************************************************************************/

OGRErr OGRESRIJSONReader::Parse( const char* pszText )
{
    json_object *jsobj = NULL;
    if( NULL != pszText && !OGRJSonParse(pszText, &jsobj, true) )
    {
        return OGRERR_CORRUPT_DATA;
    }

// JSON tree is shared for while lifetime of the reader object
    // and will be released in the destructor.
    poGJObject_ = jsobj;
    return OGRERR_NONE;
}

/************************************************************************/
/*                           ReadLayers()                               */
/************************************************************************/

void OGRESRIJSONReader::ReadLayers( OGRGeoJSONDataSource* poDS )
{
    CPLAssert( NULL == poLayer_ );

if( NULL == poGJObject_ )
    {
        CPLDebug( "ESRIJSON",
                  "Missing parsed ESRIJSON data. Forgot to call Parse()?" );
        return;
    }

OGRSpatialReference* poSRS = OGRESRIJSONReadSpatialReference( poGJObject_ );

poLayer_ = new OGRGeoJSONLayer( OGRGeoJSONLayer::DefaultName, poSRS,
                                    OGRESRIJSONGetGeometryType(poGJObject_),
                                    poDS );
    if( poSRS != NULL )
        poSRS->Release();

if( !GenerateLayerDefn() )
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                  "Layer schema generation failed." );

delete poLayer_;
        return;
    }

OGRGeoJSONLayer *poThisLayer = ReadFeatureCollection( poGJObject_ );
    if( poThisLayer == NULL )
    {
        delete poLayer_;
        return;
    }

CPLErrorReset();

poDS->AddLayer(poLayer_);
}

/************************************************************************/
/*                        GenerateFeatureDefn()                         */
/************************************************************************/

bool OGRESRIJSONReader::GenerateLayerDefn()
{
    CPLAssert( NULL != poGJObject_ );
    CPLAssert( NULL != poLayer_->GetLayerDefn() );
    CPLAssert( 0 == poLayer_->GetLayerDefn()->GetFieldCount() );

bool bSuccess = true;

/* -------------------------------------------------------------------- */
/*      Scan all features and generate layer definition.                */
/* -------------------------------------------------------------------- */
    json_object* poObjFeatures =
        OGRGeoJSONFindMemberByName( poGJObject_, "fields" );
    if( NULL != poObjFeatures &&
        json_type_array == json_object_get_type( poObjFeatures ) )
    {
        const int nFeatures = json_object_array_length( poObjFeatures );
        for( int i = 0; i < nFeatures; ++i )
        {
            json_object* poObjFeature =
                json_object_array_get_idx( poObjFeatures, i );
            if( !GenerateFeatureDefn( poObjFeature ) )
            {
                CPLDebug( "GeoJSON", "Create feature schema failure." );
                bSuccess = false;
            }
        }
    }
    else
    {
        poObjFeatures = OGRGeoJSONFindMemberByName(
            poGJObject_, "fieldAliases" );
        if( NULL != poObjFeatures &&
            json_object_get_type(poObjFeatures) == json_type_object )
        {
            OGRFeatureDefn* poDefn = poLayer_->GetLayerDefn();
            json_object_iter it;
            it.key = NULL;
            it.val = NULL;
            it.entry = NULL;
            json_object_object_foreachC( poObjFeatures, it )
            {
                OGRFieldDefn fldDefn( it.key, OFTString );
                poDefn->AddFieldDefn( &fldDefn );
            }
        }
        else
        {
            CPLError( CE_Failure, CPLE_AppDefined,
                      "Invalid FeatureCollection object. "
                      "Missing \'fields\' member." );
            bSuccess = false;
        }
    }

return bSuccess;
}

bool OGRESRIJSONReader::GenerateFeatureDefn( json_object* poObj )
{
    OGRFeatureDefn* poDefn = poLayer_->GetLayerDefn();
    CPLAssert( NULL != poDefn );

bool bSuccess = false;

/* -------------------------------------------------------------------- */
/*      Read collection of properties.                                  */
/* -------------------------------------------------------------------- */
    json_object* poObjName = OGRGeoJSONFindMemberByName( poObj, "name" );
    json_object* poObjType = OGRGeoJSONFindMemberByName( poObj, "type" );
    if( NULL != poObjName && NULL != poObjType )
    {
        OGRFieldType eFieldType = OFTString;
        if( EQUAL(json_object_get_string(poObjType), "esriFieldTypeOID") )
        {
            eFieldType = OFTInteger;
            poLayer_->SetFIDColumn(json_object_get_string(poObjName));
        }
        else if( EQUAL(json_object_get_string(poObjType),
                       "esriFieldTypeDouble") )
        {
            eFieldType = OFTReal;
        }
        else if( EQUAL(json_object_get_string(poObjType),
                       "esriFieldTypeSmallInteger") ||
                 EQUAL(json_object_get_string(poObjType),
                       "esriFieldTypeInteger") )
        {
            eFieldType = OFTInteger;
        }
        OGRFieldDefn fldDefn( json_object_get_string(poObjName),
                              eFieldType );

json_object * const poObjLength =
            OGRGeoJSONFindMemberByName( poObj, "length" );
        if( poObjLength != NULL &&
            json_object_get_type(poObjLength) == json_type_int )
        {
            const int nWidth = json_object_get_int(poObjLength);
            // A dummy width of 2147483647 seems to indicate no known field with
            // which in the OGR world is better modelled as 0 field width.
            // (#6529)
            if( nWidth != INT_MAX )
                fldDefn.SetWidth(nWidth);
        }

poDefn->AddFieldDefn( &fldDefn );

bSuccess = true;
    }
    return bSuccess;
}

/************************************************************************/
/*                           AddFeature                                 */
/************************************************************************/

bool OGRESRIJSONReader::AddFeature( OGRFeature* poFeature )
{
    if( NULL == poFeature )
        return false;

poLayer_->AddFeature( poFeature );
    delete poFeature;

return true;
}

/************************************************************************/
/*                           ReadGeometry()                             */
/************************************************************************/

OGRGeometry* OGRESRIJSONReader::ReadGeometry( json_object* poObj )
{
    OGRGeometry* poGeometry = NULL;

const OGRwkbGeometryType eType = poLayer_->GetGeomType();
    if( eType == wkbPoint )
        poGeometry = OGRESRIJSONReadPoint( poObj );
    else if( eType == wkbLineString )
        poGeometry = OGRESRIJSONReadLineString( poObj );
    else if( eType == wkbPolygon )
        poGeometry = OGRESRIJSONReadPolygon( poObj );
    else if( eType == wkbMultiPoint )
        poGeometry = OGRESRIJSONReadMultiPoint( poObj );

return poGeometry;
}

/************************************************************************/
/*                           ReadFeature()                              */
/************************************************************************/

OGRFeature* OGRESRIJSONReader::ReadFeature( json_object* poObj )
{
    CPLAssert( NULL != poObj );
    CPLAssert( NULL != poLayer_ );

OGRFeature* poFeature = new OGRFeature( poLayer_->GetLayerDefn() );

/* -------------------------------------------------------------------- */
/*      Translate ESRIJSON "attributes" object to feature attributes.   */
/* -------------------------------------------------------------------- */
    CPLAssert( NULL != poFeature );

json_object* poObjProps = NULL;
    poObjProps = OGRGeoJSONFindMemberByName( poObj, "attributes" );
    if( NULL != poObjProps &&
        json_object_get_type(poObjProps) == json_type_object )
    {
        OGRFieldDefn* poFieldDefn = NULL;
        json_object_iter it;
        it.key = NULL;
        it.val = NULL;
        it.entry = NULL;
        json_object_object_foreachC( poObjProps, it )
        {
            const int nField
                = poFeature->GetFieldIndex(it.key);
            if( nField >= 0 )
            {
                poFieldDefn = poFeature->GetFieldDefnRef(nField);
                if( poFieldDefn && it.val != NULL )
                {
                    if( EQUAL( it.key,  poLayer_->GetFIDColumn() ) )
                        poFeature->SetFID( json_object_get_int( it.val ) );
                    if( poLayer_->GetLayerDefn()->
                            GetFieldDefn(nField)->GetType() == OFTReal )
                    {
                        poFeature->SetField(
                            nField, CPLAtofM(json_object_get_string(it.val)) );
                    }
                    else
                    {
                        poFeature->SetField( nField,
                                             json_object_get_string(it.val) );
                    }
                }
            }
        }
    }

const OGRwkbGeometryType eType = poLayer_->GetGeomType();
    if( eType == wkbNone )
        return poFeature;

/* -------------------------------------------------------------------- */
/*      Translate geometry sub-object of ESRIJSON Feature.               */
/* -------------------------------------------------------------------- */
    json_object* poObjGeom = NULL;
    json_object* poTmp = poObj;
    json_object_iter it;
    it.key = NULL;
    it.val = NULL;
    it.entry = NULL;
    json_object_object_foreachC(poTmp, it)
    {
        if( EQUAL( it.key, "geometry" ) )
        {
            if( it.val != NULL )
                poObjGeom = it.val;
            // We're done.  They had 'geometry':null.
            else
                return poFeature;
        }
    }

if( NULL != poObjGeom )
    {
        OGRGeometry* poGeometry = ReadGeometry( poObjGeom );
        if( NULL != poGeometry )
        {
            poFeature->SetGeometryDirectly( poGeometry );
        }
    }
    else
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                  "Invalid Feature object. "
                  "Missing \'geometry\' member." );
        delete poFeature;
        return NULL;
    }

return poFeature;
}

/************************************************************************/
/*                           ReadFeatureCollection()                    */
/************************************************************************/

OGRGeoJSONLayer*
OGRESRIJSONReader::ReadFeatureCollection( json_object* poObj )
{
    CPLAssert( NULL != poLayer_ );

json_object* poObjFeatures
        = OGRGeoJSONFindMemberByName( poObj, "features" );
    if( NULL == poObjFeatures )
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                  "Invalid FeatureCollection object. "
                  "Missing \'features\' member." );
        return NULL;
    }

if( json_type_array == json_object_get_type( poObjFeatures ) )
    {
        const int nFeatures = json_object_array_length( poObjFeatures );
        for( int i = 0; i < nFeatures; ++i )
        {
            json_object* poObjFeature
                = json_object_array_get_idx( poObjFeatures, i );
            if( poObjFeature != NULL &&
                json_object_get_type(poObjFeature) == json_type_object )
            {
                OGRFeature* poFeature =
                    OGRESRIJSONReader::ReadFeature( poObjFeature );
                AddFeature( poFeature );
            }
        }
    }

// We're returning class member to follow the same pattern of
    // Read* functions call convention.
    CPLAssert( NULL != poLayer_ );
    return poLayer_;
}

/************************************************************************/
/*                        OGRESRIJSONGetType()                          */
/************************************************************************/

OGRwkbGeometryType OGRESRIJSONGetGeometryType( json_object* poObj )
{
    if( NULL == poObj )
        return wkbUnknown;

json_object* poObjType =
        OGRGeoJSONFindMemberByName( poObj, "geometryType" );
    if( NULL == poObjType )
    {
        return wkbNone;
    }

const char* name = json_object_get_string( poObjType );
    if( EQUAL( name, "esriGeometryPoint" ) )
        return wkbPoint;
    else if( EQUAL( name, "esriGeometryPolyline" ) )
        return wkbLineString;
    else if( EQUAL( name, "esriGeometryPolygon" ) )
        return wkbPolygon;
    else if( EQUAL( name, "esriGeometryMultiPoint" ) )
        return wkbMultiPoint;
    else
        return wkbUnknown;
}

/************************************************************************/
/*                     OGRESRIJSONGetCoordinateToDouble()               */
/************************************************************************/

static double OGRESRIJSONGetCoordinateToDouble( json_object* poObjCoord,
                                                const char* pszCoordName,
                                                bool& bValid )
{
    const int iType = json_object_get_type(poObjCoord);
    if( json_type_double != iType && json_type_int != iType )
    {
        CPLError(
            CE_Failure, CPLE_AppDefined,
            "Invalid '%s' coordinate. "
            "Type is not double or integer for \'%s\'.",
            pszCoordName,
            json_object_to_json_string(poObjCoord) );
        bValid = false;
        return 0.0;
    }

return json_object_get_double( poObjCoord );
}

/************************************************************************/
/*                       OGRESRIJSONGetCoordinate()                     */
/************************************************************************/

static double OGRESRIJSONGetCoordinate( json_object* poObj,
                                        const char* pszCoordName,
                                        bool& bValid )
{
    json_object* poObjCoord = OGRGeoJSONFindMemberByName( poObj, pszCoordName );
    if( NULL == poObjCoord )
    {
        CPLError( CE_Failure, CPLE_AppDefined,
            "Invalid Point object. "
            "Missing '%s' member.", pszCoordName );
        bValid = false;
        return 0.0;
    }

return OGRESRIJSONGetCoordinateToDouble( poObjCoord, pszCoordName, bValid );
}

/************************************************************************/
/*                          OGRESRIJSONReadPoint()                      */
/************************************************************************/

OGRPoint* OGRESRIJSONReadPoint( json_object* poObj)
{
    CPLAssert( NULL != poObj );

bool bValid = true;
    const double dfX = OGRESRIJSONGetCoordinate(poObj, "x", bValid);
    const double dfY = OGRESRIJSONGetCoordinate(poObj, "y", bValid);
    if( !bValid )
        return NULL;

json_object* poObjZ = OGRGeoJSONFindMemberByName( poObj, "z" );
    if( NULL == poObjZ )
        return new OGRPoint(dfX, dfY);

const double dfZ = OGRESRIJSONGetCoordinateToDouble(poObjZ, "z", bValid);
    if( !bValid )
        return NULL;
    return new OGRPoint(dfX, dfY, dfZ);
}

/************************************************************************/
/*                     OGRESRIJSONReaderParseZM()                  */
/************************************************************************/

static bool OGRESRIJSONReaderParseZM( json_object* poObj, bool *bHasZ,
                                      bool *bHasM )
{
    CPLAssert( NULL != poObj );
    // The ESRI geojson spec states that geometries other than point can
    // have the attributes hasZ and hasM.  A geometry that has a z value
    // implies the 3rd number in the tuple is z.  if hasM is true, but hasZ
    // is not, it is the M value.
    bool bZ = false;
    json_object* poObjHasZ = OGRGeoJSONFindMemberByName( poObj, "hasZ" );
    if( poObjHasZ != NULL )
    {
        if( json_object_get_type( poObjHasZ ) == json_type_boolean )
        {
            bZ = CPL_TO_BOOL(json_object_get_boolean( poObjHasZ ));
        }
    }

bool bM = false;
    json_object* poObjHasM = OGRGeoJSONFindMemberByName( poObj, "hasM" );
    if( poObjHasM != NULL )
    {
        if( json_object_get_type( poObjHasM ) == json_type_boolean )
        {
            bM = CPL_TO_BOOL(json_object_get_boolean( poObjHasM ));
        }
    }
    if( bHasZ != NULL )
        *bHasZ = bZ;
    if( bHasM != NULL )
        *bHasM = bM;
    return true;
}

/************************************************************************/
/*                     OGRESRIJSONReaderParseXYZMArray()                  */
/************************************************************************/

static bool OGRESRIJSONReaderParseXYZMArray( json_object* poObjCoords,
                                             bool /*bHasZ*/, bool bHasM,
                                             double* pdfX, double* pdfY,
                                             double* pdfZ, double* pdfM,
                                             int* pnNumCoords )
{
    if( poObjCoords == NULL )
    {
        CPLDebug( "ESRIJSON",
                  "OGRESRIJSONReaderParseXYZMArray: got null object." );
        return false;
    }

if( json_type_array != json_object_get_type( poObjCoords ))
    {
        CPLDebug( "ESRIJSON",
                  "OGRESRIJSONReaderParseXYZMArray: got non-array object." );
        return false;
    }

int coordDimension = json_object_array_length( poObjCoords );

// Allow 4 coordinates if M is present, but it is eventually ignored.
    if( coordDimension < 2 || coordDimension > 4 )
    {
        CPLDebug( "ESRIJSON",
                  "OGRESRIJSONReaderParseXYZMArray: got an unexpected "
                  "array object." );
        return false;
    }

// Read X coordinate.
    json_object* poObjCoord = json_object_array_get_idx( poObjCoords, 0 );
    if( poObjCoord == NULL )
    {
        CPLDebug( "ESRIJSON",
                  "OGRESRIJSONReaderParseXYZMArray: got null object." );
        return false;
    }

bool bValid = true;
    const double dfX = OGRESRIJSONGetCoordinateToDouble(poObjCoord, "x", bValid);

// Read Y coordinate.
    poObjCoord = json_object_array_get_idx( poObjCoords, 1 );
    if( poObjCoord == NULL )
    {
        CPLDebug( "ESRIJSON",
                  "OGRESRIJSONReaderParseXYZMArray: got null object." );
        return false;
    }

const double dfY = OGRESRIJSONGetCoordinateToDouble(poObjCoord, "y", bValid);
    if( !bValid )
        return false;

// Read Z or M or Z and M coordinates.
    if( coordDimension > 2)
    {
        poObjCoord = json_object_array_get_idx( poObjCoords, 2 );
        if( poObjCoord == NULL )
        {
            CPLDebug( "ESRIJSON",
                      "OGRESRIJSONReaderParseXYZMArray: got null object." );
            return false;
        }

const double dfZorM = OGRESRIJSONGetCoordinateToDouble(poObjCoord,
                        (coordDimension > 3 || !bHasM) ? "z": "m", bValid);
        if( !bValid )
            return false;
        if( pdfZ != NULL )
        {
            if (coordDimension > 3 || !bHasM)
                *pdfZ = dfZorM;
            else
                *pdfZ = 0.0;
        }
        if( pdfM != NULL && coordDimension == 3 )
        {
            if (bHasM)
                *pdfM = dfZorM;
            else
                *pdfM = 0.0;
        }
        if( coordDimension == 4 )
        {
            poObjCoord = json_object_array_get_idx( poObjCoords, 3 );
            if( poObjCoord == NULL )
            {
                CPLDebug( "ESRIJSON",
                        "OGRESRIJSONReaderParseXYZMArray: got null object." );
                return false;
            }

const double dfM = OGRESRIJSONGetCoordinateToDouble(poObjCoord,
                                                                "m", bValid);
            if( !bValid )
                return false;
            if( pdfM != NULL )
                *pdfM = dfM;
        }
    }
    else
    {
        if( pdfZ != NULL )
            *pdfZ = 0.0;
        if( pdfM != NULL )
            *pdfM = 0.0;
    }

if( pnNumCoords != NULL )
        *pnNumCoords = coordDimension;
    if( pdfX != NULL )
        *pdfX = dfX;
    if( pdfY != NULL )
        *pdfY = dfY;

return true;
}

/************************************************************************/
/*                        OGRESRIJSONReadLineString()                   */
/************************************************************************/

OGRGeometry* OGRESRIJSONReadLineString( json_object* poObj )
{
    CPLAssert( NULL != poObj );

bool bHasZ = false;
    bool bHasM = false;

if( !OGRESRIJSONReaderParseZM( poObj, &bHasZ, &bHasM ) )
    {
        CPLError( CE_Warning, CPLE_AppDefined,
                  "Failed to parse hasZ and/or hasM from geometry" );
    }

json_object* poObjPaths = OGRGeoJSONFindMemberByName( poObj, "paths" );
    if( NULL == poObjPaths )
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                  "Invalid LineString object. "
                  "Missing \'paths\' member." );
        return NULL;
    }

if( json_type_array != json_object_get_type( poObjPaths ) )
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                  "Invalid LineString object. "
                  "Invalid \'paths\' member." );
        return NULL;
    }

OGRMultiLineString* poMLS = NULL;
    OGRGeometry* poRet = NULL;
    const int nPaths = json_object_array_length( poObjPaths );
    for( int iPath = 0; iPath < nPaths; iPath++ )
    {
        json_object* poObjPath = json_object_array_get_idx( poObjPaths, iPath );
        if( poObjPath == NULL ||
            json_type_array != json_object_get_type( poObjPath ) )
        {
            delete poRet;
            CPLDebug( "ESRIJSON", "LineString: got non-array object." );
            return NULL;
        }

OGRLineString* poLine = new OGRLineString();
        if( nPaths > 1 )
        {
            if( iPath == 0 )
            {
                poMLS = new OGRMultiLineString();
                poRet = poMLS;
            }
            poMLS->addGeometryDirectly(poLine);
        }
        else
        {
            poRet = poLine;
        }
        const int nPoints = json_object_array_length( poObjPath );
        for( int i = 0; i < nPoints; i++ )
        {
            int nNumCoords = 2;
            json_object* poObjCoords =
                json_object_array_get_idx( poObjPath, i );
            double dfX = 0.0;
            double dfY = 0.0;
            double dfZ = 0.0;
            double dfM = 0.0;
            if( !OGRESRIJSONReaderParseXYZMArray (
              poObjCoords, bHasZ, bHasM, &dfX, &dfY, &dfZ, &dfM, &nNumCoords) )
            {
                delete poRet;
                return NULL;
            }

if( nNumCoords == 3 && !bHasM )
            {
                poLine->addPoint( dfX, dfY, dfZ);
            }
            else if( nNumCoords == 3 )
            {
                poLine->addPointM( dfX, dfY, dfM);
            }
            else if( nNumCoords == 4 )
            {
                poLine->addPoint( dfX, dfY, dfZ, dfM);
            }
            else
            {
                poLine->addPoint( dfX, dfY );
            }
        }
    }

if( poRet == NULL )
        poRet = new OGRLineString();

return poRet;
}

/************************************************************************/
/*                          OGRESRIJSONReadPolygon()                    */
/************************************************************************/

OGRGeometry* OGRESRIJSONReadPolygon( json_object* poObj)
{
    CPLAssert( NULL != poObj );

bool bHasZ = false;
    bool bHasM = false;

if( !OGRESRIJSONReaderParseZM( poObj, &bHasZ, &bHasM ) )
    {
        CPLError( CE_Warning, CPLE_AppDefined,
                  "Failed to parse hasZ and/or hasM from geometry" );
    }

json_object* poObjRings = OGRGeoJSONFindMemberByName( poObj, "rings" );
    if( NULL == poObjRings )
    {
        CPLError( CE_Failure, CPLE_AppDefined,
            "Invalid Polygon object. "
            "Missing \'rings\' member." );
        return NULL;
    }

if( json_type_array != json_object_get_type( poObjRings ) )
    {
        CPLError( CE_Failure, CPLE_AppDefined,
            "Invalid Polygon object. "
            "Invalid \'rings\' member." );
        return NULL;
    }

const int nRings = json_object_array_length( poObjRings );
    OGRGeometry** papoGeoms = new OGRGeometry*[nRings];
    for( int iRing = 0; iRing < nRings; iRing++ )
    {
        json_object* poObjRing = json_object_array_get_idx( poObjRings, iRing );
        if( poObjRing == NULL ||
            json_type_array != json_object_get_type( poObjRing ) )
        {
            for( int j = 0; j < iRing; j++ )
                delete papoGeoms[j];
            delete[] papoGeoms;
            CPLDebug( "ESRIJSON",
                    "Polygon: got non-array object." );
            return NULL;
        }

OGRPolygon* poPoly = new OGRPolygon();
        OGRLinearRing* poLine = new OGRLinearRing();
        poPoly->addRingDirectly(poLine);
        papoGeoms[iRing] = poPoly;

const int nPoints = json_object_array_length( poObjRing );
        for( int i = 0; i < nPoints; i++ )
        {
            int nNumCoords = 2;
            json_object* poObjCoords =
                json_object_array_get_idx( poObjRing, i );
            double dfX = 0.0;
            double dfY = 0.0;
            double dfZ = 0.0;
            double dfM = 0.0;
            if( !OGRESRIJSONReaderParseXYZMArray (
              poObjCoords, bHasZ, bHasM, &dfX, &dfY, &dfZ, &dfM, &nNumCoords) )
            {
                for( int j = 0; j <= iRing; j++ )
                    delete papoGeoms[j];
                delete[] papoGeoms;
                return NULL;
            }

OGRGeometry* poRet = OGRGeometryFactory::organizePolygons( papoGeoms,
                                                               nRings,
                                                               NULL,
                                                               NULL);
    delete[] papoGeoms;

return poRet;
}

/************************************************************************/
/*                        OGRESRIJSONReadMultiPoint()                   */
/************************************************************************/

OGRMultiPoint* OGRESRIJSONReadMultiPoint( json_object* poObj)
{
    CPLAssert( NULL != poObj );

bool bHasZ = false;
    bool bHasM = false;

if( !OGRESRIJSONReaderParseZM( poObj, &bHasZ, &bHasM ) )
    {
        CPLError( CE_Warning, CPLE_AppDefined,
                  "Failed to parse hasZ and/or hasM from geometry" );
    }

json_object* poObjPoints = OGRGeoJSONFindMemberByName( poObj, "points" );
    if( NULL == poObjPoints )
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                  "Invalid MultiPoint object. "
                  "Missing \'points\' member." );
        return NULL;
    }

if( json_type_array != json_object_get_type( poObjPoints ) )
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                  "Invalid MultiPoint object. "
                  "Invalid \'points\' member." );
        return NULL;
    }

OGRMultiPoint* poMulti = new OGRMultiPoint();

const int nPoints = json_object_array_length( poObjPoints );
    for( int i = 0; i < nPoints; i++ )
    {
        int nNumCoords = 2;
        json_object* poObjCoords =
            json_object_array_get_idx( poObjPoints, i );
        double dfX = 0.0;
        double dfY = 0.0;
        double dfZ = 0.0;
        double dfM = 0.0;
        if( !OGRESRIJSONReaderParseXYZMArray (
            poObjCoords, bHasZ, bHasM, &dfX, &dfY, &dfZ, &dfM, &nNumCoords) )
        {
            delete poMulti;
            return NULL;
        }

if( nNumCoords == 3 && !bHasM )
        {
            poMulti->addGeometryDirectly( new OGRPoint(dfX, dfY, dfZ) );
        }
        else if( nNumCoords == 3 )
        {
            OGRPoint* poPoint = new OGRPoint(dfX, dfY);
            poPoint->setM(dfM);
            poMulti->addGeometryDirectly( poPoint );
        }
        else if( nNumCoords == 4 )
        {
            poMulti->addGeometryDirectly( new OGRPoint(dfX, dfY, dfZ, dfM) );
        }
        else
        {
            poMulti->addGeometryDirectly( new OGRPoint(dfX, dfY) );
        }
    }

return poMulti;
}

/************************************************************************/
/*                    OGRESRIJSONReadSpatialReference()                 */
/************************************************************************/

OGRSpatialReference* OGRESRIJSONReadSpatialReference( json_object* poObj )
{
/* -------------------------------------------------------------------- */
/*      Read spatial reference definition.                              */
/* -------------------------------------------------------------------- */
    OGRSpatialReference* poSRS = NULL;

json_object* poObjSrs =
        OGRGeoJSONFindMemberByName( poObj, "spatialReference" );
    if( NULL != poObjSrs )
    {
        json_object* poObjWkid = OGRGeoJSONFindMemberByName( poObjSrs, "latestWkid" );
        if( poObjWkid == NULL )
            poObjWkid = OGRGeoJSONFindMemberByName( poObjSrs, "wkid" );
        if( poObjWkid == NULL )
        {
            json_object* poObjWkt =
                OGRGeoJSONFindMemberByName( poObjSrs, "wkt" );
            if( poObjWkt == NULL )
                return NULL;

char* pszWKT =
                const_cast<char*>(json_object_get_string( poObjWkt ));
            poSRS = new OGRSpatialReference();
            if( OGRERR_NONE != poSRS->importFromWkt( &pszWKT ) ||
                poSRS->morphFromESRI() != OGRERR_NONE )
            {
                delete poSRS;
                poSRS = NULL;
            }

return poSRS;
        }

const int nEPSG = json_object_get_int( poObjWkid );

poSRS = new OGRSpatialReference();
        if( OGRERR_NONE != poSRS->importFromEPSG( nEPSG ) )
        {
            delete poSRS;
            poSRS = NULL;
        }
    }

return poSRS;
}