ファクトリの取得方法

Java C++

うーんＣ＋＋で下のようなコードの書き方がわからん・・・

import java.util.Map;

public abstract class Base {
    static Map<String, Factory> map;
    static {
        map.put("foo", new Foo.FooFactory());
        map.put("bar", new Bar.BarFactory());
    }
    
    static Base create(String target) {
        for (Map.Entry<String, Factory> entry : Base.map.entrySet()) {
            if (target.equals(entry.getKey())) {
                return entry.getValue().create();
            }
        }
        return null;
    }
    
    public abstract String getType();
}


interface Factory {
    Base create();
}

class Foo extends Base {
    static class FooFactory implements Factory {
        public Foo create() {
            return new Foo();
        }
    }
    
    public String getType() {
        return "foo";
    };
}

class Bar extends Base {
    static class BarFactory implements Factory {
        public Bar create() {
            return new Bar();
        }
    }
    
    public String getType() {
        return "bar";
    };
}

class Main {
    public static void main(String[] args) {
        Base base = Base.create("bar");
        System.out.println(base.getType());
    }
}