* msOGRLayerOpen() * * Open OGR data source for the specified map layer. * * If pszOverrideConnection != NULL then this value is used as the connection * string instead of lp->connection. This is used for instance to open * a WFS layer, in this case lp->connection is the WFS url, but we want * OGR to open the local file on disk that was previously downloaded. * * An O
| 2199 | * Returns MS_SUCCESS/MS_FAILURE |
| 2200 | **********************************************************************/ |
| 2201 | int msOGRLayerOpen(layerObj *layer, const char *pszOverrideConnection) |
| 2202 | { |
| 2203 | #ifdef USE_OGR |
| 2204 | |
| 2205 | msOGRFileInfo *psInfo; |
| 2206 | |
| 2207 | if (layer->layerinfo != NULL) |
| 2208 | { |
| 2209 | return MS_SUCCESS; // Nothing to do... layer is already opened |
| 2210 | } |
| 2211 | |
| 2212 | /* -------------------------------------------------------------------- */ |
| 2213 | /* If this is not a tiled layer, just directly open the target. */ |
| 2214 | /* -------------------------------------------------------------------- */ |
| 2215 | if( layer->tileindex == NULL ) |
| 2216 | { |
| 2217 | psInfo = msOGRFileOpen( layer, |
| 2218 | (pszOverrideConnection ? pszOverrideConnection: |
| 2219 | layer->connection) ); |
| 2220 | layer->layerinfo = psInfo; |
| 2221 | layer->tileitemindex = -1; |
| 2222 | |
| 2223 | if( layer->layerinfo == NULL ) |
| 2224 | return MS_FAILURE; |
| 2225 | } |
| 2226 | |
| 2227 | /* -------------------------------------------------------------------- */ |
| 2228 | /* Otherwise we open the tile index, identify the tile item */ |
| 2229 | /* index and try to select the first file matching our query */ |
| 2230 | /* region. */ |
| 2231 | /* -------------------------------------------------------------------- */ |
| 2232 | else |
| 2233 | { |
| 2234 | // Open tile index |
| 2235 | |
| 2236 | psInfo = msOGRFileOpen( layer, layer->tileindex ); |
| 2237 | layer->layerinfo = psInfo; |
| 2238 | |
| 2239 | if( layer->layerinfo == NULL ) |
| 2240 | return MS_FAILURE; |
| 2241 | |
| 2242 | // Identify TILEITEM |
| 2243 | |
| 2244 | OGRFeatureDefnH hDefn = OGR_L_GetLayerDefn( psInfo->hLayer ); |
| 2245 | for( layer->tileitemindex = 0; |
| 2246 | layer->tileitemindex < OGR_FD_GetFieldCount( hDefn ) |
| 2247 | && !EQUAL( OGR_Fld_GetNameRef( OGR_FD_GetFieldDefn( hDefn, layer->tileitemindex) ), |
| 2248 | layer->tileitem); |
| 2249 | layer->tileitemindex++ ) {} |
| 2250 | |
| 2251 | if( layer->tileitemindex == OGR_FD_GetFieldCount( hDefn ) ) |
| 2252 | { |
| 2253 | msSetError(MS_OGRERR, |
| 2254 | "Can't identify TILEITEM %s field in TILEINDEX `%s'.", |
| 2255 | "msOGRLayerOpen()", |
| 2256 | layer->tileitem, layer->tileindex ); |
| 2257 | msOGRFileClose( layer, psInfo ); |
| 2258 | layer->layerinfo = NULL; |
no test coverage detected