/*
 * The MIT License
 * Copyright © 2014-2019 Ilkka Seppälä
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.iluwatar.front.controller;

/**
 * FrontController is the handler class that takes in all the requests and renders the correct
 * response.
 */
public class FrontController {

  public void handleRequest(String request) {
    Command command = getCommand(request);
    command.process();
  }

  private Command getCommand(String request) {
    Class<?> commandClass = getCommandClass(request);
    try {
      return (Command) commandClass.newInstance();
    } catch (Exception e) {
      throw new ApplicationException(e);
    }
  }

  private static Class<?> getCommandClass(String request) {
    Class<?> result;
    try {
      result = Class.forName("com.iluwatar.front.controller." + request + "Command");
    } catch (ClassNotFoundException e) {
      result = UnknownCommand.class;
    }
    return result;
  }
}