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NCStr.cc
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NCStr.cc
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// -*- mode: c++; c-basic-offset:4 -*-
// This file is part of nc_handler, a data handler for the OPeNDAP data
// server.
// Copyright (c) 2002,2003 OPeNDAP, Inc.
// Author: James Gallagher <[email protected]>
//
// This is free software; you can redistribute it and/or modify it under the
// terms of the GNU Lesser General Public License as published by the Free
// Software Foundation; either version 2.1 of the License, or (at your
// option) any later version.
//
// This software is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
// License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
// (c) COPYRIGHT URI/MIT 1994-1996
// Please read the full copyright statement in the file COPYRIGHT.
//
// Authors:
// reza Reza Nekovei ([email protected])
// netCDF sub-class implementation for NCByte,...NCGrid.
// The files are patterned after the subcalssing examples
// Test<type>.c,h files.
//
// ReZa 1/12/95
#include "config_nc.h"
static char rcsid[] not_used = { "$Id$" };
// #define DODS_DEBUG 1
#include <netcdf.h>
#include <InternalErr.h>
#include "NCStr.h"
#include <debug.h>
NCStr::NCStr(const string &n, const string &d) :
Str(n, d)
{
}
NCStr::NCStr(const NCStr &rhs) :
Str(rhs)
{
}
NCStr::~NCStr()
{
}
NCStr &
NCStr::operator=(const NCStr &rhs)
{
if (this == &rhs)
return *this;
dynamic_cast<NCStr&> (*this) = rhs;
return *this;
}
BaseType *
NCStr::ptr_duplicate()
{
return new NCStr(*this);
}
// This method assumes that NC_CHAR variables with zero or one dimension will
// be represented as a DAP String. If there are two or more dimensions, then
// the variable is represented in an array of DAP Strings.
bool NCStr::read()
{
if (read_p()) //has been done
return true;
int ncid, errstat;
errstat = nc_open(dataset().c_str(), NC_NOWRITE, &ncid); /* netCDF id */
if (errstat != NC_NOERR) {
string err = "Could not open the dataset's file (" + dataset() + ")";
throw Error(errstat, err);
}
int varid; /* variable Id */
errstat = nc_inq_varid(ncid, name().c_str(), &varid);
if (errstat != NC_NOERR)
throw Error(errstat, "Could not get variable ID.");
nc_type datatype; /* variable data type */
int num_dim; /* number of dim. in variable */
errstat = nc_inq_var(ncid, varid, (char *) 0, &datatype, &num_dim, (int *) 0, (int *) 0);
if (errstat != NC_NOERR)
throw Error(errstat, string("Could not read information about the variable `") + name() + string("'."));
#if NETCDF_VERSION == 3
// This stuff is only relevant when the handler is linked to a netcdf3
// library.
if (datatype != NC_CHAR)
throw InternalErr(__FILE__, __LINE__, "Entered String read method with non-string/char variable!");
#endif
switch (datatype) {
case NC_CHAR:
if (num_dim == 1) {
int dim_id;
errstat = nc_inq_vardimid(ncid, varid, &dim_id);
if (errstat != NC_NOERR)
throw Error(errstat, string("Could not read the dimension id of `") + name() + string("'."));
size_t dim_size;
errstat = nc_inq_dimlen(ncid, dim_id, &dim_size);
if (errstat != NC_NOERR)
throw Error(errstat, string("Could not read the dimension size of `") + name() + string("'."));
char *charbuf = new char[dim_size + 1];
// get the data
size_t cor[1] = { 0 };
size_t edg[1];
edg[0] = dim_size;
errstat = nc_get_vara_text(ncid, varid, cor, edg, charbuf);
if (errstat != NC_NOERR) {
delete[] charbuf;
throw Error(errstat, string("Could not read data from the variable `") + name() + string("'."));
}
charbuf[dim_size] = '\0';
// poke the data into the DAP string
set_value(string(charbuf));
delete[] charbuf;
}
else if (num_dim == 0) { // the variable is a scalar, so it's just one character.
char *charbuf = new char[2];
// get the data
errstat = nc_get_var_text(ncid, varid, charbuf);
if (errstat != NC_NOERR) {
delete[] charbuf;
throw Error(errstat, string("Could not read data from the variable `") + name() + string("'."));
}
charbuf[1] = '\0';
// poke the data into the DAP string
set_value(string(charbuf));
delete[] charbuf;
}
else
throw Error(string("Multidimensional character array found in string class while reading '") + name() + string("'."));
break;
#if NETCDF_VERSION >= 4
case NC_STRING: {
size_t cor[MAX_NC_DIMS]; /* corner coordinates */
for (int id = 0; id <= num_dim && id < MAX_NC_DIMS; id++)
cor[id] = 0;
// before using vector<>, this code used 'char **strpp = new char*[2];'
// replaced this 'vector<char> strpp(sizeof(char*));' with...
vector<char*> strpp(1);
// get the data
errstat = nc_get_var1_string(ncid, varid, cor, &strpp[0]);
if (errstat != NC_NOERR) {
throw Error(errstat, string("Could not read data from the variable `") + name() + string("'."));
}
// poke the data into the DAP string
// replaced this 'set_value(string(*(char**)&strpp[0]));' with ...
set_value(string(strpp[0]));
nc_free_string(1, &strpp[0]);
break;
}
#endif
default:
throw InternalErr(__FILE__, __LINE__, "Entered String read method with an unrecognized datatype!");
}
return true;
}