RASTER_setBandPath()

Datum RASTER_setBandPath

(

PG_FUNCTION_ARGS

)

Definition at line 931 of file rtpg_band_properties.c.

{
        rt_pgraster *pgraster = NULL;
        rt_pgraster *pgrtn = NULL;
        rt_raster raster = NULL;
        rt_band band = NULL;
        int32_t bandindex = 1;
        const char *outdbpathchar = NULL;
        int32_t outdbindex = 1;
        bool forceset = FALSE;
        rt_band newband = NULL;
 
        int hasnodata;
        double nodataval = 0.;
 
        if (PG_ARGISNULL(0))
                PG_RETURN_NULL();
        pgraster = (rt_pgraster *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
 
        raster = rt_raster_deserialize(pgraster, FALSE);
        if (!raster) {
                PG_FREE_IF_COPY(pgraster, 0);
                elog(ERROR, "RASTER_setBandPath: Cannot deserialize raster");
                PG_RETURN_NULL();
        }
 
        /* Check index is not NULL or smaller than 1 */
        if (!PG_ARGISNULL(1))
                bandindex = PG_GETARG_INT32(1);
 
        if (bandindex < 1)
                elog(NOTICE, "Invalid band index (must use 1-based). Returning original raster");
        else {
                /* Fetch requested band */
                band = rt_raster_get_band(raster, bandindex - 1);
 
                if (!band)
                        elog(NOTICE, "Cannot find raster band of index %d. Returning original raster", bandindex);
                else if (!rt_band_is_offline(band)) {
                        elog(NOTICE, "Band of index %d is not out-db. Returning original raster", bandindex);
                }
                else {
                        /* outdbpath */
                        if (!PG_ARGISNULL(2))
                                outdbpathchar = text_to_cstring(PG_GETARG_TEXT_P(2));
                        else
                                outdbpathchar = rt_band_get_ext_path(band);
 
                        /* outdbindex, is 1-based */
                        if (!PG_ARGISNULL(3))
                        outdbindex = PG_GETARG_INT32(3);
 
                        /* force */
                        if (!PG_ARGISNULL(4))
                                forceset = PG_GETARG_BOOL(4);
 
                        hasnodata = rt_band_get_hasnodata_flag(band);
                        if (hasnodata)
                                rt_band_get_nodata(band, &nodataval);
 
                        newband = rt_band_new_offline_from_path(
                                rt_raster_get_width(raster),
                                rt_raster_get_height(raster),
                                hasnodata,
                                nodataval,
                                outdbindex,
                                outdbpathchar,
                                forceset
                        );
 
                        if (rt_raster_replace_band(raster, newband, bandindex - 1) == NULL)
                                elog(NOTICE, "Cannot change path of band. Returning original raster");
                        else
                                /* old band is in the variable band */
                                rt_band_destroy(band);
                }
        }
 
        /* Serialize raster again */
        pgrtn = rt_raster_serialize(raster);
        rt_raster_destroy(raster);
        PG_FREE_IF_COPY(pgraster, 0);
        if (!pgrtn) PG_RETURN_NULL();
 
        SET_VARSIZE(pgrtn, pgrtn->size);
        PG_RETURN_POINTER(pgrtn);
}

References ovdump::band, FALSE, rtrowdump::raster, rt_band_destroy(), rt_band_get_ext_path(), rt_band_get_hasnodata_flag(), rt_band_get_nodata(), rt_band_is_offline(), rt_band_new_offline_from_path(), rt_raster_deserialize(), rt_raster_destroy(), rt_raster_get_band(), rt_raster_get_height(), rt_raster_get_width(), rt_raster_replace_band(), rt_raster_serialize(), and rt_raster_serialized_t::size.

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