src: Reorganizing source code in preparation to merge NRD code

Note that as of this commit, there are several changes in location of
compiled binaries in `build/` folder:

* `nfd` has been moved to `build/bin/nfd`
* `unit-tests` has been split into `unit-tests-core` and `unit-tests-daemon`

Change-Id: I2c830c117879edbaa5457d6423c13f0273285919
Refs: #1486
diff --git a/core/logger-factory.hpp b/core/logger-factory.hpp
new file mode 100644
index 0000000..b5aa31d
--- /dev/null
+++ b/core/logger-factory.hpp
@@ -0,0 +1,107 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014  Regents of the University of California,
+ *                     Arizona Board of Regents,
+ *                     Colorado State University,
+ *                     University Pierre & Marie Curie, Sorbonne University,
+ *                     Washington University in St. Louis,
+ *                     Beijing Institute of Technology
+ *
+ * This file is part of NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * NFD 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+#ifndef NFD_CORE_LOGGER_FACTORY_HPP
+#define NFD_CORE_LOGGER_FACTORY_HPP
+
+#include "common.hpp"
+#include "config-file.hpp"
+#include "logger.hpp"
+
+namespace nfd {
+
+class LoggerFactory : noncopyable
+{
+public:
+
+  class Error : public std::runtime_error
+  {
+  public:
+    explicit
+    Error(const std::string& error)
+      : std::runtime_error(error)
+    {
+    }
+  };
+
+  static LoggerFactory&
+  getInstance();
+
+  void
+  setConfigFile(ConfigFile& config);
+
+  void
+  onConfig(const ConfigSection& section, bool isDryRun, const std::string& filename);
+
+  std::list<std::string>
+  getModules() const;
+
+  static Logger&
+  create(const std::string& moduleName);
+
+
+PUBLIC_WITH_TESTS_ELSE_PRIVATE:
+
+  // these methods are used during unit-testing
+
+  LogLevel
+  getDefaultLevel() const;
+
+  void
+  setDefaultLevel(LogLevel level);
+
+private:
+
+  LoggerFactory();
+
+  Logger&
+  createLogger(const std::string& moduleName);
+
+  LogLevel
+  parseLevel(const std::string& level);
+
+private:
+
+  typedef std::map<std::string, LogLevel> LevelMap;
+  typedef std::pair<std::string, LogLevel> NameAndLevel;
+
+  LevelMap m_levelNames;
+
+  typedef std::map<std::string, Logger> LoggerMap;
+  typedef std::pair<std::string, Logger> NameAndLogger;
+
+  LoggerMap m_loggers;
+
+  LogLevel m_defaultLevel;
+};
+
+inline LogLevel
+LoggerFactory::getDefaultLevel() const
+{
+  return m_defaultLevel;
+}
+
+} // namespace nfd
+
+#endif // NFD_CORE_LOGGER_FACTORY_HPP