Map values injection

Hello
I am having some issues related to binding entries to map property:

Suppose I have several instances of classes implementing interface

Code:

---

interface MyInterface{
    int[] getPossibleMapKeys()
}

---

for example:

Code:

---

@Component
public class ClassA{
    int[] getPossibleMapKeys(){
    return new int[2] // suppose we have some values
    }
}

---

and I have another class C like

Code:

---

@Component
class ClassHavingMap{
    @Autowired
    private Map<Integer, MyInterface> myMap;
}

---

and I want to define in xml that all my instances of MyInterface class would be autowired to myMap property:

Code:

---

    <bean class="ClassHavingMap">

        <property name="myMap">
            <map>
                <entry key="???" value-ref="???"/>
          </map>
...

---

How can i assure that the same instance of MyInterface class will be stored under all different map keys, returned by getPossibleMapKeys() method? Do you know if it is even possible or it is totally wrong approach?