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2010-03-27T03:49:15.353
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In what voodoo have you got yourself into :) ? From the question and comments I assumed that you are sure that you have objects that extend abstract class <code>SomeClass</code> and also implement interface <code>SomeOtherClass</code>. If this is the case I suggest an intermediate abstract class in the hierarchy that share these properties. <pre><code>public abstract class Foo<K> extends SomeClass implements SomeOtherClass<K> { ... } </code></pre> That way you could simplify the static method signature to: <pre><code>public <K,V extends Foo<K>> void doSomethingWithSomeMap (Map<K,V> map, V data); </code></pre> If you do not want to change your current object hierarchy you can fool the compiler using another level of indirection with the <a href="http://en.wikipedia.org/wiki/Adapter_pattern" rel="nofollow noreferrer">adapter pattern</a>. <blockquote> "All problems in computer science can be solved by another level of indirection." -- David Wheeler </blockquote> <pre><code>public abstract class SomeClass { public abstract void method1(); } public interface SomeOtherClass<K> { void method2(K value); } public class MyClass extends SomeClass implements SomeOtherClass<Integer> { @Override public void method1() { System.out.println("MyClass.method1"); } @Override public void method2(Integer value) { System.out.println("MyClass.method2(" + value + ")"); } } public class Indirection<K> extends SomeClass implements SomeOtherClass<K> { private final Object objectValue; public Indirection(final Object value) { this.objectValue = value; } @Override public void method1() { ((SomeClass) objectValue).method1(); } @Override public void method2(K value) { @SuppressWarnings("unchecked") SomeOtherClass<K> delegate = ((SomeOtherClass<K>) objectValue); delegate.method2(value); } } public static void main(String[] args) { Map someMap = new HashMap<Integer, MyClass>(); SomeClass someData = new MyClass(); Indirection a = new Indirection(someData); doSomethingWithSomeMap(someMap, a, 12); } public static <K,V extends SomeClass & SomeOtherClass<K>> void doSomethingWithSomeMap (Map<K,V> map, V data, K value) { data.method1(); data.method2(value); } </code></pre> This would print: <blockquote> MyClass.method1 MyClass.method2(12) </blockquote>
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1. POForce an unchecked call
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1. USJorge Ferreira
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1. COHmm, this is the best solution so far. But, it won't work in all case when there is polymorphism on class SomeClass where superclasses does not implements SomeOtherClass which is my case. You gave me an idea for another solution, all SomeClass could implements SomeOtherClass with the default implementation throwing a NotImplementedException, but I don't like the solution since it cannot check at runtime if you are using the function right. I'll think I stick with my first idea to do a safe and a unsafe version of doSomethingWithSomeMap. Thanks.
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 USBéatrice Cassistat

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