Boolean ValueEncoder

[Geoff Callender]

Hi,

I've struck a problem while trying to do a Select on a Boolean with 3- 
value logic: I display "", "true", and "false".

The problem is that when the user chooses "", Tapestry sets the value  
field to Boolean.FALSE instead of null.

Here's the template code:

	<select t:id="active" t:type="Select" value="active" model="actives"  
encoder="booleanValueEncoder"/>

Here's the relevant java:

	static private final Boolean[] ACTIVES = { null, Boolean.TRUE,  
Boolean.FALSE };
	static private final BooleanValueEncoder BOOLEAN_VALUE_ENCODER = new  
BooleanValueEncoder();

        public Boolean getActive() {
                return _active;
        }

        public  void setActive(Boolean active) {
                _active = active;
        }

        public Boolean[] getActives() {
                return ACTIVES;
        }
        
        public BooleanValueEncoder getBooleanValueEncoder() {
                return BOOLEAN_VALUE_ENCODER;
        }

Here's my BooleanValueEncoder:

public class BooleanValueEncoder implements ValueEncoder<Boolean> {

        public String toClient(Boolean value) {
                return value == null ? "" : value.toString();
        }

        public Boolean toValue(String clientValue) {
                return clientValue.equals("") ? null : 
Boolean.valueOf(clientValue);
        }

}

I've checked that when "" is chosen the encoder does return null, but  
then Tapestry calls setActive(false).

Am I doing something wrong?

Regards,

Geoff