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// -*- mode: c++; c-basic-offset:4 -*-
// This file is part of libdap, A C++ implementation of the OPeNDAP Data
// Access Protocol.
// Copyright (c) 2013 OPeNDAP, Inc.
// Authors: Nathan Potter <npotter@opendap.org>
// James Gallagher <jgallagher@opendap.org>
//
// This library 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 library 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.
#include "config.h"
#include <BaseType.h>
#include <TestFloat64.h>
#include <TestStr.h>
#include <TestArray.h>
#include <Error.h>
#include <DDS.h>
#include <debug.h>
#include <util.h>
#include "TestFunction.h"
namespace libdap {
/**
* @brief scale a scalar or array variable
* This does not work for DAP2 Grids; only Array and scalar variables.
*/
void
function_scale(int argc, BaseType * argv[], DDS &, BaseType **btpp)
{
string info =
string("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n") +
"<function name=\"scale\" version=\"1.0\" href=\"http://docs.opendap.org/index.php/Server_Side_Processing_Functions\">\n" +
"</function>";
if (argc == 0) {
Str *response = new TestStr("info");
response->set_value(info);
*btpp = response;
return;
}
// Check for 2 arguments
DBG(cerr << "argc = " << argc << endl);
if (argc != 2)
throw Error(malformed_expr,"Wrong number of arguments to scale().");
double m = extract_double_value(argv[1]);
DBG(cerr << "m: " << m << << endl);
// Read the data, scale and return the result.
BaseType *dest = 0;
double *data;
if (argv[0]->is_vector_type()) {
TestArray &source = static_cast<TestArray&>(*argv[0]);
source.read();
data = extract_double_array(&source);
int length = source.length();
for (int i = 0; i < length; ++i)
data[i] = data[i] * m;
Array *result = new TestArray(source);
result->add_var_nocopy(new TestFloat64(source.name()));
result->set_value(data, length);
delete[] data; // set_value copies.
dest = result;
}
else if (argv[0]->is_simple_type() && !(argv[0]->type() == dods_str_c || argv[0]->type() == dods_url_c)) {
argv[0]->read();
double data = extract_double_value(argv[0]);
data *= m;
Float64 *fdest = new TestFloat64(argv[0]->name());
fdest->set_value(data);
dest = fdest;
}
else {
throw Error(malformed_expr,"The scale() function works only for Arrays and scalars.");
}
*btpp = dest;
return;
}
} // namespace libdap
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