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2012-08-03T15:23:44.553
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First, as java is a strongly-typed single inheritance language, you cannot escape the delegation. But you can avoid having to write a lot of delegation CODE, by using a dirty little trick with Proxies and reflection. Code follows <pre><code>public interface Interface1 { void m1(); } public interface Interface2 { void m2(); } public class Class1 implements Interface1 { public void m1() { System.out.println(1); } } public class Class2 implements Interface2 { public void m2() { System.out.println(2); } } public interface MixinInterface extends Interface1, Interface2 { } </code></pre> And this is how the magic happens <pre><code>package j.with.pseudo.multiple.inheritance; import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; import java.lang.reflect.Proxy; public class MixinBuilder { public static Object buildMixed(Class _interface, Object... impls){ InvocationHandler h = new MixinHandler(_interface.getInterfaces(), impls); return Proxy.newProxyInstance(MixinBuilder.class.getClassLoader(), new Class[]{_interface}, h); } public static void main(String[] args) { Class1 o1 = new Class1(); Class2 o2 = new Class2(); MixinInterface almost_like_multiple_inheritance_guy = (MixinInterface) buildMixed(MixinInterface.class, o1, o2); almost_like_multiple_inheritance_guy.m1(); almost_like_multiple_inheritance_guy.m2(); } private static class MixinHandler implements InvocationHandler{ private Class[] interfaces; private Object[] impls; public MixinHandler(Class[] interfaces, Object[] impls) { this.interfaces = interfaces; this.impls = impls; } public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { int i=0; for(Class _interface : interfaces){ if(method.getDeclaringClass().isAssignableFrom(_interface)){ return method.invoke(impls[i], args); } i++; } // TODO Auto-generated method stub throw new RuntimeException("Method not found: "+method); } } } </code></pre> Pretty cool huh? :-)
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1. POHow can I get the benefits of implementation inheritance without tying my class to a particular implementation?
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