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AbstractFactory.java
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AbstractFactory.java
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// Abstract Factory
package creational.factories;
import javafx.util.Pair;
import org.reflections.Reflections;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Type;
import java.util.*;
interface HotDrink
{
void consume();
}
class Tea implements HotDrink
{
@Override
public void consume() {
System.out.println("This tea is delicious");
}
}
class Coffee implements HotDrink
{
@Override
public void consume() {
System.out.println("This coffee is delicious");
}
}
interface HotDrinkFactory
{
HotDrink prepare(int amount);
}
class TeaFactory implements HotDrinkFactory
{
@Override
public HotDrink prepare(int amount) {
System.out.println(
"Put in tea bag, boil water, pour "
+ amount + "ml, add lemon, enjoy!"
);
return new Tea();
}
}
class CoffeeFactory implements HotDrinkFactory
{
@Override
public HotDrink prepare(int amount) {
System.out.println(
"Grind some beans, boil water, pour "
+ amount + "ml, add cream and sugar, enjoy!"
);
return new Coffee();
}
}
class HotDrinkMachine
{
private List<Pair<String,HotDrinkFactory>> namedFactories
= new ArrayList<>();
public HotDrinkMachine() throws Exception {
Set<Class<? extends HotDrinkFactory>> types =
new Reflections("")
.getSubTypesOf(HotDrinkFactory.class);
for(Class<? extends HotDrinkFactory> type : types)
{
namedFactories.add(new Pair<>(
type.getSimpleName().replace("Factory", ""),
type.getDeclaredConstructor().newInstance()
));
}
}
public HotDrink makeDrink() throws Exception
{
System.out.println("Available drinks:");
for (int index = 0; index < namedFactories.size(); index++)
{
Pair<String, HotDrinkFactory> item = namedFactories.get(index);
System.out.println("" + index + ": " + item.getKey());
}
BufferedReader reader =
new BufferedReader(new InputStreamReader(System.in));
while (true)
{
String s;
int i, amount;
if((s = reader.readLine()) != null
&& (i = Integer.parseInt(s)) >= 0
&& i < namedFactories.size())
{
System.out.println("Specify amount:");
s = reader.readLine();
if (s != null && (amount = Integer.parseInt(s)) > 0)
{
// Critical part! Get appropriate factory and make drink
return namedFactories.get(i).getValue().prepare(amount);
}
}
System.out.println("Incorrect input, try again.");
}
}
}
class AbstractFactoryDemo {
public static void main(String[] args) throws Exception {
HotDrinkMachine machine = new HotDrinkMachine();
HotDrink drink = machine.makeDrink();
drink.consume();
}
}