util.cpp

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// Jubatus: Online machine learning framework for distributed environment
// Copyright (C) 2011 Preferred Networks and Nippon Telegraph and Telephone Corporation.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License version 2.1 as published by the Free Software Foundation.
//
// 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

#include <map>
#include <stdexcept>
#include <string>
#include "jubatus/util/lang/cast.h"
#include "exception.hpp"
#include "util.hpp"

namespace jubatus {
namespace core {
namespace fv_converter {

const std::string& get_or_die(
    const std::map<std::string, std::string>& params,
    const std::string& key) {
  std::map<std::string, std::string>::const_iterator it = params.find(key);
  if (it == params.end()) {
    throw JUBATUS_EXCEPTION(converter_exception(
        std::string("\"" + key + "\" is not specified in parameters")));
  }
  return it->second;
}

std::string get_with_default(
    const std::map<std::string, std::string>& params,
    const std::string& key,
    const std::string& default_value) {
  std::map<std::string, std::string>::const_iterator it = params.find(key);
  if (it == params.end()) {
    return default_value;
  } else {
    return it->second;
  }
}

int get_int_or_die(
    const std::map<std::string, std::string>& params,
    const std::string& key) {
  const std::string& s = get_or_die(params, key);
  try {
    return jubatus::util::lang::lexical_cast<int>(s);
  } catch (const std::bad_cast&) {
    throw JUBATUS_EXCEPTION(converter_exception(
        std::string("\"" + key + "\" must be an integer value: " + s)));
  }
}

}  // namespace fv_converter
}  // namespace core
}  // namespace jubatus