Line data    Source code

       1             : /******************************************************************************
       2             :  *
       3             :  * Project:  Carto Translator
       4             :  * Purpose:  Implements OGRCARTOResultLayer class.
       5             :  * Author:   Even Rouault, <even dot rouault at spatialys.com>
       6             :  *
       7             :  ******************************************************************************
       8             :  * Copyright (c) 2013, Even Rouault <even dot rouault at spatialys.com>
       9             :  *
      10             :  * Permission is hereby granted, free of charge, to any person obtaining a
      11             :  * copy of this software and associated documentation files (the "Software"),
      12             :  * to deal in the Software without restriction, including without limitation
      13             :  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      14             :  * and/or sell copies of the Software, and to permit persons to whom the
      15             :  * Software is furnished to do so, subject to the following conditions:
      16             :  *
      17             :  * The above copyright notice and this permission notice shall be included
      18             :  * in all copies or substantial portions of the Software.
      19             :  *
      20             :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
      21             :  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      22             :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
      23             :  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      24             :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      25             :  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
      26             :  * DEALINGS IN THE SOFTWARE.
      27             :  ****************************************************************************/
      28             : 
      29             : #include "ogr_carto.h"
      30             : 
      31             : /************************************************************************/
      32             : /*                          OGRCARTOResultLayer()                     */
      33             : /************************************************************************/
      34             : 
      35          80 : OGRCARTOResultLayer::OGRCARTOResultLayer(OGRCARTODataSource *poDSIn,
      36          80 :                                          const char *pszRawQueryIn)
      37          80 :     : OGRCARTOLayer(poDSIn), poFirstFeature(nullptr)
      38             : {
      39          80 :     osBaseSQL = pszRawQueryIn;
      40          80 :     SetDescription("result");
      41          80 : }
      42             : 
      43             : /************************************************************************/
      44             : /*                       ~OGRCARTOResultLayer()                       */
      45             : /************************************************************************/
      46             : 
      47         160 : OGRCARTOResultLayer::~OGRCARTOResultLayer()
      48             : 
      49             : {
      50          80 :     delete poFirstFeature;
      51         160 : }
      52             : 
      53             : /************************************************************************/
      54             : /*                          GetLayerDefnInternal()                      */
      55             : /************************************************************************/
      56             : 
      57         168 : OGRFeatureDefn *OGRCARTOResultLayer::GetLayerDefnInternal(json_object *poObjIn)
      58             : {
      59         168 :     if (poFeatureDefn != nullptr)
      60         100 :         return poFeatureDefn;
      61             : 
      62          68 :     EstablishLayerDefn("result", poObjIn);
      63             : 
      64          68 :     return poFeatureDefn;
      65             : }
      66             : 
      67             : /************************************************************************/
      68             : /*                           GetNextRawFeature()                        */
      69             : /************************************************************************/
      70             : 
      71         260 : OGRFeature *OGRCARTOResultLayer::GetNextRawFeature()
      72             : {
      73         260 :     if (poFirstFeature)
      74             :     {
      75          58 :         OGRFeature *poRet = poFirstFeature;
      76          58 :         poFirstFeature = nullptr;
      77          58 :         return poRet;
      78             :     }
      79             :     else
      80         202 :         return OGRCARTOLayer::GetNextRawFeature();
      81             : }
      82             : 
      83             : /************************************************************************/
      84             : /*                                IsOK()                                */
      85             : /************************************************************************/
      86             : 
      87          80 : bool OGRCARTOResultLayer::IsOK()
      88             : {
      89          80 :     CPLErrorReset();
      90          80 :     poFirstFeature = GetNextFeature();
      91          80 :     return CPLGetLastErrorType() == 0;
      92             : }
      93             : 
      94             : /************************************************************************/
      95             : /*                             GetSRS_SQL()                             */
      96             : /************************************************************************/
      97             : 
      98           0 : CPLString OGRCARTOResultLayer::GetSRS_SQL(const char *pszGeomCol)
      99             : {
     100           0 :     CPLString osSQL;
     101           0 :     CPLString osLimitedSQL;
     102             : 
     103           0 :     size_t nPos = osBaseSQL.ifind(" LIMIT ");
     104           0 :     if (nPos != std::string::npos)
     105             :     {
     106           0 :         osLimitedSQL = osBaseSQL;
     107           0 :         size_t nSize = osLimitedSQL.size();
     108           0 :         for (size_t i = nPos + strlen(" LIMIT "); i < nSize; i++)
     109             :         {
     110           0 :             if (osLimitedSQL[i] == ' ' && osLimitedSQL[i - 1] == '0')
     111             :             {
     112           0 :                 osLimitedSQL[i - 1] = '1';
     113           0 :                 break;
     114             :             }
     115           0 :             osLimitedSQL[i] = '0';
     116             :         }
     117             :     }
     118             :     else
     119           0 :         osLimitedSQL.Printf("%s LIMIT 1", osBaseSQL.c_str());
     120             : 
     121             :     /* Assuming that the SRID of the first non-NULL geometry applies */
     122             :     /* to geometries of all rows. */
     123             :     osSQL.Printf("SELECT srid, srtext FROM spatial_ref_sys WHERE srid IN "
     124             :                  "(SELECT ST_SRID(%s) FROM (%s) ogr_subselect)",
     125           0 :                  OGRCARTOEscapeIdentifier(pszGeomCol).c_str(),
     126           0 :                  osLimitedSQL.c_str());
     127             : 
     128           0 :     return osSQL;
     129             : }