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20101772
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2013-11-20T16:43:46.200
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2013-11-24T16:14:27.433
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2013-11-24T16:14:27.433
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Have you considered extending a class that takes <code>Enum</code> as a generic parameter? It is an amazingly flexible mechanism. <pre><code>public class Entity<E extends Enum<E> & Entity.IE> { // Set of all possible entries. // Backed by an EnumSet so we have all the efficiency implied along with a defined order. private final Set<E> all; public Entity(Class<E> e) { // Make a set of them. this.all = Collections.unmodifiableSet(EnumSet.<E>allOf(e)); } // Demonstration. public E[] values() { // Make a new one every time - like Enum.values. E[] values = makeTArray(all.size()); int i = 0; for (E it : all) { values[i++] = it; } return values; } // Trick to make a T[] of any length. // Do not pass any parameter for `dummy`. // public because this is potentially re-useable. public static <T> T[] makeTArray(int length, T... dummy) { return Arrays.copyOf(dummy, length); } // Example interface to implement. public interface IE { @Override public String toString(); } } class Thing extends Entity<Thing.Stuff> { public Thing() { super(Stuff.class); } enum Stuff implements Entity.IE { One, Two; } } </code></pre> You can pass the nature of your implementation up to the parent class in many different ways - I use <code>enum.class</code> for simplicity. You can even make the <code>enum</code> implement an interface as you can see. The <code>values</code> method is for demonstration only. Once you have access to the <code>Set<E></code> in the parent class you can provide all sorts of functionality just by extending <code>Entity</code>.
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1. POHow to use Java Enums being DRY with only a single parameter different between instantiations?
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1. USOldCurmudgeon
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