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Avoid wrapper instanciation hell with 2 functions and 1 interface !
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| $ javac WrapperTest.java | |
| $ java WrapperTest | |
| I'm a developer. Explicit is better than implicit ! Keep it KISS. |
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| public class WrapperTest { | |
| public static void main(String[] args) throws ReflectiveOperationException { | |
| Developer myProfile = wrap(MainDeveloper.class, PythonDeveloper.class, UnixDeveloper.class); | |
| System.out.println(myProfile.develop()); | |
| } | |
| public static <T> T wrap(Class<T> t, Class... classes) throws ReflectiveOperationException, ClassCastException { | |
| return wrap(t.newInstance(), classes); | |
| } | |
| @SuppressWarnings("unchecked") | |
| public static <T> T wrap(T t, Class... classes) throws ReflectiveOperationException, ClassCastException { | |
| if (classes.length == 0) return t; | |
| Object temp; | |
| Wrapper<T> newRet; | |
| Wrapper<T> ret = (Wrapper<T>) classes[0].newInstance(); | |
| ret.wrap(t); | |
| for (int i = 1; i < classes.length; i++) { | |
| temp = classes[i].newInstance(); | |
| newRet = (Wrapper<T>) temp; | |
| newRet.wrap((T) ret); | |
| ret = newRet; | |
| } | |
| return (T) ret; | |
| } | |
| public static interface Wrapper<T> { | |
| void wrap(T t); | |
| } | |
| public static interface Developer { | |
| String develop(); | |
| } | |
| public static class MainDeveloper implements Developer { | |
| @Override | |
| public String develop() { | |
| return "I'm a developer."; | |
| } | |
| } | |
| public static class PythonDeveloper implements Developer, Wrapper<Developer> { | |
| private Developer developer; | |
| @Override | |
| public void wrap(Developer developer) { | |
| this.developer = developer; | |
| } | |
| @Override | |
| public String develop() { | |
| return developer.develop() + " Explicit is better than implicit !"; | |
| } | |
| } | |
| public static class UnixDeveloper implements Developer, Wrapper<Developer> { | |
| private Developer developer; | |
| @Override | |
| public void wrap(Developer developer) { | |
| this.developer = developer; | |
| } | |
| @Override | |
| public String develop() { | |
| return developer.develop() + " Keep it KISS."; | |
| } | |
| } | |
| } |
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