1                 : /******************************************************************************
       2                 :  * $Id: ogrsqlitesinglefeaturelayer.cpp 19205 2010-03-26 22:48:37Z rouault $
       3                 :  *
       4                 :  * Project:  OpenGIS Simple Features Reference Implementation
       5                 :  * Purpose:  Implements OGRSQLiteSingleFeatureLayer class.
       6                 :  * Author:   Even Rouault, <even dot rouault at mines dash paris dot org>
       7                 :  *
       8                 :  ******************************************************************************
       9                 :  * Copyright (c) 2010, Even Rouault
      10                 :  *
      11                 :  * Permission is hereby granted, free of charge, to any person obtaining a
      12                 :  * copy of this software and associated documentation files (the "Software"),
      13                 :  * to deal in the Software without restriction, including without limitation
      14                 :  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      15                 :  * and/or sell copies of the Software, and to permit persons to whom the
      16                 :  * Software is furnished to do so, subject to the following conditions:
      17                 :  *
      18                 :  * The above copyright notice and this permission notice shall be included
      19                 :  * in all copies or substantial portions of the Software.
      20                 :  *
      21                 :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
      22                 :  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      23                 :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
      24                 :  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      25                 :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      26                 :  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
      27                 :  * DEALINGS IN THE SOFTWARE.
      28                 :  ****************************************************************************/
      29                 : 
      30                 : #include "cpl_conv.h"
      31                 : #include "cpl_string.h"
      32                 : #include "ogr_sqlite.h"
      33                 : 
      34                 : CPL_CVSID("$Id: ogrsqlitesinglefeaturelayer.cpp 19205 2010-03-26 22:48:37Z rouault $");
      35                 : 
      36                 : /************************************************************************/
      37                 : /*                    OGRSQLiteSingleFeatureLayer()                     */
      38                 : /************************************************************************/
      39                 : 
      40                 : OGRSQLiteSingleFeatureLayer::OGRSQLiteSingleFeatureLayer(
      41                 :                                                      const char* pszLayerName,
      42              37 :                                                      int nVal )
      43                 : {
      44              37 :     poFeatureDefn = new OGRFeatureDefn( "SELECT" );
      45              37 :     poFeatureDefn->Reference();
      46              37 :     OGRFieldDefn oField( pszLayerName, OFTInteger );
      47              37 :     poFeatureDefn->AddFieldDefn( &oField );
      48                 : 
      49              37 :     iNextShapeId = 0;
      50              37 :     this->nVal = nVal;
      51              37 : }
      52                 : 
      53                 : /************************************************************************/
      54                 : /*                   ~OGRSQLiteSingleFeatureLayer()                     */
      55                 : /************************************************************************/
      56                 : 
      57              37 : OGRSQLiteSingleFeatureLayer::~OGRSQLiteSingleFeatureLayer()
      58                 : {
      59              37 :     if( poFeatureDefn != NULL )
      60                 :     {
      61              37 :         poFeatureDefn->Release();
      62              37 :         poFeatureDefn = NULL;
      63                 :     }
      64              37 : }
      65                 : 
      66                 : /************************************************************************/
      67                 : /*                            ResetReading()                            */
      68                 : /************************************************************************/
      69                 : 
      70               2 : void OGRSQLiteSingleFeatureLayer::ResetReading()
      71                 : {
      72               2 :     iNextShapeId = 0;
      73               2 : }
      74                 : 
      75                 : /************************************************************************/
      76                 : /*                           GetNextFeature()                           */
      77                 : /************************************************************************/
      78                 : 
      79               3 : OGRFeature * OGRSQLiteSingleFeatureLayer::GetNextFeature()
      80                 : {
      81               3 :     if (iNextShapeId != 0)
      82               1 :         return NULL;
      83                 : 
      84               2 :     OGRFeature* poFeature = new OGRFeature(poFeatureDefn);
      85               2 :     poFeature->SetField(0, nVal);
      86               2 :     poFeature->SetFID(iNextShapeId ++);
      87               2 :     return poFeature;
      88                 : }
      89                 : 
      90                 : /************************************************************************/
      91                 : /*                            GetLayerDefn()                            */
      92                 : /************************************************************************/
      93                 : 
      94               0 : OGRFeatureDefn * OGRSQLiteSingleFeatureLayer::GetLayerDefn()
      95                 : {
      96               0 :     return poFeatureDefn;
      97                 : }
      98                 : 
      99                 : /************************************************************************/
     100                 : /*                           TestCapability()                           */
     101                 : /************************************************************************/
     102                 : 
     103               0 : int OGRSQLiteSingleFeatureLayer::TestCapability( const char * )
     104                 : {
     105               0 :     return FALSE;
     106                 : }