Line data    Source code

       1             : /******************************************************************************
       2             :  *
       3             :  * Project:  OpenGIS Simple Features Reference Implementation
       4             :  * Purpose:  Implementation of OGC Features and Geometries JSON (JSON-FG)
       5             :  * Author:   Even Rouault <even.rouault at spatialys.com>
       6             :  *
       7             :  ******************************************************************************
       8             :  * Copyright (c) 2023, Even Rouault <even.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_jsonfg.h"
      30             : 
      31             : /************************************************************************/
      32             : /*             OGRJSONFGStreamingParserGetMaxObjectSize()               */
      33             : /************************************************************************/
      34             : 
      35         283 : static size_t OGRJSONFGStreamingParserGetMaxObjectSize()
      36             : {
      37             :     const double dfTmp =
      38         283 :         CPLAtof(CPLGetConfigOption("OGR_JSONFG_MAX_OBJ_SIZE", "200"));
      39         283 :     return dfTmp > 0 ? static_cast<size_t>(dfTmp * 1024 * 1024) : 0;
      40             : }
      41             : 
      42             : /************************************************************************/
      43             : /*                     OGRJSONFGStreamingParser()                       */
      44             : /************************************************************************/
      45             : 
      46         283 : OGRJSONFGStreamingParser::OGRJSONFGStreamingParser(OGRJSONFGReader &oReader,
      47         283 :                                                    bool bFirstPass)
      48             :     : OGRJSONCollectionStreamingParser(
      49             :           bFirstPass, /*bStoreNativeData=*/false,
      50             :           OGRJSONFGStreamingParserGetMaxObjectSize()),
      51         283 :       m_oReader(oReader)
      52             : {
      53         283 : }
      54             : 
      55             : /************************************************************************/
      56             : /*                   ~OGRJSONFGStreamingParser()                        */
      57             : /************************************************************************/
      58             : 
      59             : OGRJSONFGStreamingParser::~OGRJSONFGStreamingParser() = default;
      60             : 
      61             : /************************************************************************/
      62             : /*                OGRJSONFGStreamingParser::Clone()                     */
      63             : /************************************************************************/
      64             : 
      65         103 : std::unique_ptr<OGRJSONFGStreamingParser> OGRJSONFGStreamingParser::Clone()
      66             : {
      67             :     auto poRet =
      68         103 :         std::make_unique<OGRJSONFGStreamingParser>(m_oReader, IsFirstPass());
      69         103 :     poRet->m_osRequestedLayer = m_osRequestedLayer;
      70         103 :     return poRet;
      71             : }
      72             : 
      73             : /************************************************************************/
      74             : /*                          GetNextFeature()                            */
      75             : /************************************************************************/
      76             : 
      77             : std::pair<std::unique_ptr<OGRFeature>, OGRLayer *>
      78         541 : OGRJSONFGStreamingParser::GetNextFeature()
      79             : {
      80         541 :     if (m_nCurFeatureIdx < m_apoFeatures.size())
      81             :     {
      82         774 :         auto poRet = std::move(m_apoFeatures[m_nCurFeatureIdx]);
      83         387 :         m_apoFeatures[m_nCurFeatureIdx].first = nullptr;
      84         387 :         m_apoFeatures[m_nCurFeatureIdx].second = nullptr;
      85         387 :         m_nCurFeatureIdx++;
      86         387 :         return poRet;
      87             :     }
      88         154 :     m_nCurFeatureIdx = 0;
      89         154 :     m_apoFeatures.clear();
      90         154 :     return std::pair(nullptr, nullptr);
      91             : }
      92             : 
      93             : /************************************************************************/
      94             : /*                          AnalyzeFeature()                            */
      95             : /************************************************************************/
      96             : 
      97         703 : void OGRJSONFGStreamingParser::GotFeature(json_object *poObj, bool bFirstPass,
      98             :                                           const std::string & /*osJson*/)
      99             : {
     100         703 :     if (bFirstPass)
     101             :     {
     102         163 :         m_oReader.GenerateLayerDefnFromFeature(poObj);
     103             :     }
     104             :     else
     105             :     {
     106         540 :         OGRJSONFGStreamedLayer *poStreamedLayer = nullptr;
     107         540 :         auto poFeat = m_oReader.ReadFeature(poObj, m_osRequestedLayer.c_str(),
     108        1080 :                                             nullptr, &poStreamedLayer);
     109         540 :         if (poFeat)
     110             :         {
     111         537 :             CPLAssert(poStreamedLayer);
     112             :             m_apoFeatures.emplace_back(
     113         537 :                 std::pair(std::move(poFeat), poStreamedLayer));
     114             :         }
     115             :     }
     116         703 : }
     117             : 
     118             : /************************************************************************/
     119             : /*                            TooComplex()                              */
     120             : /************************************************************************/
     121             : 
     122           0 : void OGRJSONFGStreamingParser::TooComplex()
     123             : {
     124           0 :     if (!ExceptionOccurred())
     125           0 :         EmitException("JSON object too complex/large. You may define the "
     126             :                       "OGR_JSONFG_MAX_OBJ_SIZE configuration option to "
     127             :                       "a value in megabytes to allow "
     128             :                       "for larger features, or 0 to remove any size limit.");
     129           0 : }