add user database storage

simply added UserDB* source code and modified Makefile.
others are untouched.

UserDBentry.cpp

@@ -0,0 +1,54 @@
+/*
+ *   Copyright (C) 2020 by SASANO Takayoshi JG1UAA
+ *
+ *   This program 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 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program 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 this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include "UserDBentry.h"
+#include <algorithm>
+
+CUserDBentry::CUserDBentry() :
+m_db()
+{
+}
+
+CUserDBentry::~CUserDBentry()
+{
+}
+
+const std::vector<std::string> CUserDBentry::keyList {
+	keyRADIO_ID, keyCALLSIGN, keyFIRST_NAME, keyLAST_NAME,
+	keyCITY, keySTATE, keyCOUNTRY,
+};
+
+bool CUserDBentry::isValidKey(const std::string key)
+{
+	auto it = std::find(keyList.begin(), keyList.end(), key);
+	return it != keyList.end();
+}
+
+void CUserDBentry::set(const std::string key, const std::string value)
+{
+	if (isValidKey(key))
+		m_db[key] = value;
+}
+
+std::string CUserDBentry::get(const std::string key)
+{
+	try {
+		return m_db.at(key);
+	} catch (...) {
+		return "";
+	}
+}