R-package/src/name.h

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/*!
 *  Copyright (c) 2015 by Contributors
 * \file name.h
 * \brief Name manager to get default names.
 */
#ifndef MXNET_RCPP_NAME_H_
#define MXNET_RCPP_NAME_H_

#include <map>
#include <string>

namespace mxnet {
namespace R {

/*!
 * \brief A name manager to attach names
 *  This is a very simple implementation.
 */
class NameManager {
 public:
  /*!
   * \brief Get a canonical name given name and hint
   * \param name The name passed in from parameter
   * \param hint The hint used to generate the name.
   */
  virtual std::string GetName(const std::string& name,
                              const std::string& hint) {
    if (name.length() != 0) return name;
    if (counter_.count(hint) == 0) {
      counter_[hint] = 0;
    }
    size_t cnt = counter_[hint]++;
    std::ostringstream os;
    os << hint << cnt;
    return os.str();
  }
  /*! \return  global singleton of the manager */
  static NameManager *Get();

 private:
  // internal counter
  std::map<std::string, size_t> counter_;
};
}  // namespace R
}  // namespace mxnet
#endif  // MXNET_RCPP_NAME_H_