pgis_asgeobuf_transfn()

Datum pgis_asgeobuf_transfn

(

PG_FUNCTION_ARGS

)

Definition at line 46 of file lwgeom_out_geobuf.c.

{
#if ! (defined HAVE_LIBPROTOBUF && defined HAVE_GEOBUF)
        elog(ERROR, "ST_AsGeobuf: Missing libprotobuf-c >= version 1.1");
        PG_RETURN_NULL();
#else
        MemoryContext aggcontext, oldcontext;
        struct geobuf_agg_context *ctx;
 
        /* We need to initialize the internal cache to access it later via postgis_oid() */
        postgis_initialize_cache(fcinfo);
 
        if (!AggCheckCallContext(fcinfo, &aggcontext))
                elog(ERROR, "pgis_asgeobuf_transfn: called in non-aggregate context");
        oldcontext = MemoryContextSwitchTo(aggcontext);
 
        if (PG_ARGISNULL(0)) {
                ctx = palloc(sizeof(*ctx));
 
                ctx->geom_name = NULL;
                if (PG_NARGS() > 2 && !PG_ARGISNULL(2))
                        ctx->geom_name = text_to_cstring(PG_GETARG_TEXT_P(2));
                geobuf_agg_init_context(ctx);
        } else {
                ctx = (struct geobuf_agg_context *) PG_GETARG_POINTER(0);
        }
 
        if (!type_is_rowtype(get_fn_expr_argtype(fcinfo->flinfo, 1)))
                elog(ERROR, "pgis_asgeobuf_transfn: parameter row cannot be other than a rowtype");
 
        /* Null input tuple => null result */
        if (PG_ARGISNULL(1)) {
                PG_RETURN_NULL();
        }
 
        ctx->row = PG_GETARG_HEAPTUPLEHEADER(1);
 
        geobuf_agg_transfn(ctx);
        MemoryContextSwitchTo(oldcontext);
        PG_RETURN_POINTER(ctx);
#endif
}

References geobuf_agg_init_context(), geobuf_agg_transfn(), geobuf_agg_context::geom_name, geobuf_agg_context::row, and text_to_cstring().

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