Re: something like bidirectional Hashmaps

Subject: Re: something like bidirectional Hashmaps

From: Miguel Muñoz <email@hidden>

Date: Mon, 11 Dec 2006 21:59:25 -0800

Delivered-to: email@hidden

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Your objection is perfectly valid, but the main point of my code was to show you how you can write code that isn't error-prone. The technique I've applied can be adapted to your needs in many different ways without breaking MVC.

There's certainly something to be said for not putting the display name in the model. You could instead use the toString() method as the resource key, and still get the resource from the resource file. But then you'd still probably need a bidirectional map. It shouldn't be hard to write one. For example:

public interface ReversableMap<K, V> extends Map<K, V> {

public K reverseGet(V value);

}

public class TwoWayMap<K, V> extends HashMap<K, V> implements ReversableMap<K, V> {

private HashMap<V, K> reverseMap = new HashMap<V, K>();

TwoWayMap() {

super();

}

public K reverseGet(V value) { return reverseMap.get(v); }

public put(K key, V value) {

super.put(key, value);

reverseMap.put(value, key);

}

// override for efficiency.

public boolean containsValue(Object value) { return reverseMap.containsKey(value); }

}

I think that should cover it. I haven't compiled this, but it shouldn't be too hard to make it work. I'm pretty sure the default clone() method would work if you need it to, but be sure to test it if you do.

On Dec 11, 2006, at 12:02 PM, email@hidden wrote:

Message: 1

Date: Sun, 10 Dec 2006 21:22:13 +0100

From: Helge Hartmann <email@hidden>

Subject: Re: something like bidirectional Hashmaps

To: Apple Java-Mailing-Liste <email@hidden>

Message-ID: <email@hidden">email@hidden>

Content-Type: text/plain; charset=ISO-8859-1; delsp=yes; format=flowed

Hi!

I thougt about putting the diplay name in the Enum class tto. But

when I follow the MVC-pattern, the model classes should have nothing

to do with the visualization.

And when once want to support multiple languages, I think this should

not be in the Enum class.

Helge

-------------------------------------------

Miguel Muñoz

email@hidden

323/225-7285

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