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39 changes: 39 additions & 0 deletions abstract-factory/README.md
Original file line number Diff line number Diff line change
Expand Up @@ -120,6 +120,45 @@ king.getDescription(); // Output: This is the Elven king!
army.getDescription(); // Output: This is the Elven Army!
```

Now, we can design a factory for our different kingdom factories. In this example, we created FactoryMaker, responsible for returning an instance of either ElfKingdomFactory or OrcKingdomFactory.
The client can use FactoryMaker to create the desired concrete factory which, in turn, will produce different concrete objects (Army, King, Castle).
In this example, we also used an enum to parameterize which type of kingdom factory the client will ask for.

```
public static class FactoryMaker {

public enum KingdomType {
ELF, ORC
}

public static KingdomFactory makeFactory(KingdomType type) {
switch (type) {
case ELF:
return new ElfKingdomFactory();
case ORC:
return new OrcKingdomFactory();
default:
throw new IllegalArgumentException("KingdomType not supported.");
}
}
}

public static void main(String[] args) {
App app = new App();

LOGGER.info("Elf Kingdom");
app.createKingdom(FactoryMaker.makeFactory(KingdomType.ELF));
LOGGER.info(app.getArmy().getDescription());
LOGGER.info(app.getCastle().getDescription());
LOGGER.info(app.getKing().getDescription());

LOGGER.info("Orc Kingdom");
app.createKingdom(FactoryMaker.makeFactory(KingdomType.ORC));
-- similar use of the orc factory
}
```


## Applicability
Use the Abstract Factory pattern when

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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,8 @@
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.iluwatar.abstractfactory.App.FactoryMaker.KingdomType;

/**
*
* The Abstract Factory pattern provides a way to encapsulate a group of individual factories that have a common theme
Expand Down Expand Up @@ -56,7 +58,7 @@ public void createKingdom(final KingdomFactory factory) {
setCastle(factory.createCastle());
setArmy(factory.createArmy());
}

King getKing(final KingdomFactory factory) {
return factory.createKing();
}
Expand Down Expand Up @@ -92,9 +94,36 @@ public Army getArmy() {
private void setArmy(final Army army) {
this.army = army;
}

/**
* Program entry point
* The factory of kingdom factories.
*/
public static class FactoryMaker {

/**
* Enumeration for the different types of Kingdoms.
*/
public enum KingdomType {
ELF, ORC
}

/**
* The factory method to create KingdomFactory concrete objects.
*/
public static KingdomFactory makeFactory(KingdomType type) {
switch (type) {
case ELF:
return new ElfKingdomFactory();
case ORC:
return new OrcKingdomFactory();
default:
throw new IllegalArgumentException("KingdomType not supported.");
}
}
}

/**
* Program entry point.
*
* @param args
* command line args
Expand All @@ -104,17 +133,15 @@ public static void main(String[] args) {
App app = new App();

LOGGER.info("Elf Kingdom");
app.createKingdom(new ElfKingdomFactory());
app.createKingdom(FactoryMaker.makeFactory(KingdomType.ELF));
LOGGER.info(app.getArmy().getDescription());
LOGGER.info(app.getCastle().getDescription());
LOGGER.info(app.getKing().getDescription());

LOGGER.info("Orc Kingdom");
app.createKingdom(new OrcKingdomFactory());
app.createKingdom(FactoryMaker.makeFactory(KingdomType.ORC));
LOGGER.info(app.getArmy().getDescription());
LOGGER.info(app.getCastle().getDescription());
LOGGER.info(app.getKing().getDescription());

}

}
}
Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,9 @@
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import com.iluwatar.abstractfactory.App.FactoryMaker;
import com.iluwatar.abstractfactory.App.FactoryMaker.KingdomType;

import org.junit.Before;
import org.junit.Test;

Expand All @@ -39,8 +42,8 @@ public class AbstractFactoryTest {

@Before
public void setUp() {
elfFactory = new ElfKingdomFactory();
orcFactory = new OrcKingdomFactory();
elfFactory = FactoryMaker.makeFactory(KingdomType.ELF);
orcFactory = FactoryMaker.makeFactory(KingdomType.ORC);
}

@Test
Expand Down