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App.java
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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");
}
}
}