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/**

* The MIT License

* Copyright (c) 2014 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.

*/

import abstractextensions.CommanderExtension;

import abstractextensions.SergeantExtension;

import abstractextensions.SoldierExtension;

import units.CommanderUnit;

import units.SergeantUnit;

import units.SoldierUnit;

import units.Unit;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

* Anticipate that an object’s interface needs to be extended in the future.

* Additional interfaces are defined by extension objects.

*/

public class App {

/**

* Program entry point

*

* @param args command line args

*/

public static void main(String[] args) {

//Create 3 different units

Unit soldierUnit = new SoldierUnit("SoldierUnit1");

Unit sergeantUnit = new SergeantUnit("SergeantUnit1");

Unit commanderUnit = new CommanderUnit("CommanderUnit1");

//check for each unit to have an extension

checkExtensionsForUnit(soldierUnit);

checkExtensionsForUnit(sergeantUnit);

checkExtensionsForUnit(commanderUnit);

}

private static void checkExtensionsForUnit(Unit unit) {

final Logger logger = LoggerFactory.getLogger(App.class);

SoldierExtension soldierExtension = (SoldierExtension) unit.getUnitExtension("SoldierExtension");

SergeantExtension sergeantExtension = (SergeantExtension) unit.getUnitExtension("SergeantExtension");

CommanderExtension commanderExtension = (CommanderExtension) unit.getUnitExtension("CommanderExtension");

//if unit have extension call the method

if (soldierExtension != null) {

soldierExtension.soldierReady();

} else {

logger.info(unit.getName() + " without SoldierExtension");

}

if (sergeantExtension != null) {

sergeantExtension.sergeantReady();

} else {

logger.info(unit.getName() + " without SergeantExtension");

}

if (commanderExtension != null) {

commanderExtension.commanderReady();

} else {

logger.info(unit.getName() + " without CommanderExtension");

}

}

}