Hi Tom,
Let me describe what I need.
Out of the box, I want to have a default value "SESSIONS.ser".
And that need to be able to set with value "".
I try @Attribute(defaultValue="SESSIONS.ser") before.
I find that the default value will be provided if I set it "".
How can we achieve this?
Thanks.
Shing Wai Chan
On 2/2/11 7:59 AM, Tom Mueller wrote:
> Shing Wai,
> I'm not sure that I understand the question either.
>
> I don't understand what you mean by "internally we have a default".
> Do you mean that inside your code, you check to see if the value of
> the attribute is null, and then use "SESSIONS.ser" instead?
>
> What actually is the problem?
>
> Is it that when you have @Attribute(defaultValue="SESSIONS.ser"), and
> then someone does setSessionFileName(""), that the value doesn't go to
> the empty string but instead goes back to the default value? Same
> with calling setSessionFileName(null)?
>
> Tom
>
>
> On 2/1/2011 9:08 PM, Jennifer Chou wrote:
>> Maybe I don't quite understand. Can you check if
>> ManagerProperties.getSessionFileName() returns null to distinguish
>> that sessionFileName was not set?
>> Can you give some specific examples for when defaultValue, "", null
>> should be used?
>>
>> On 2/1/2011 9:27 PM, Shing Wai Chan wrote:
>>> If I do not set the default value, then I will get null for
>>> ManagerProperties.getSessionFileName() when user does not specify
>>> element.
>>> In our case, how can distinguish between not set and explicitly set
>>> it to "".
>>>
>>>
>>> On 2/1/11 4:48 PM, Jennifer Chou wrote:
>>>> Actually, I think if you have a default value it will always return
>>>> the default value if you don't set any value (set to "" or null).
>>>> I guess you should not use the defaultValue on the attribute so you
>>>> can set it to "" or null.
>>>> Then maybe you can add a static field or method to return the
>>>> default value? I don't know if that will work for you.
>>>>
>>>> On 2/1/2011 7:06 PM, Shing Wai Chan wrote:
>>>>> cc. Tom
>>>>> Any comment?
>>>>> Shing Wai Chan
>>>>>
>>>>> On 2/1/11 3:32 PM, Shing Wai Chan wrote:
>>>>>> Hi Jennifer,
>>>>>>
>>>>>> I have a question on admin backend. Hope that you can help me.
>>>>>> There is a attribute in config-api/.../ManagerProperties.java:
>>>>>> @Attribute
>>>>>> public String getSessionFileName();
>>>>>>
>>>>>> Right now, the default is null.
>>>>>> But internally, we have a default "SESSIONS.ser".
>>>>>> There is a bug that we cannot unset this value.
>>>>>>
>>>>>> What is the best way to do that?
>>>>>> I try to change it as follows:
>>>>>> - @Attribute
>>>>>> + @Attribute(defaultValue="SESSIONS.ser")
>>>>>> public String getSessionFileName();
>>>>>>
>>>>>> and find that the admin backend will provide the default value
>>>>>> "SESSIONS.ser"
>>>>>> if we don't set a value for sessionFileName.
>>>>>>
>>>>>> What is the best way to resolve this?
>>>>>> Is there anyway we can specify "" or null and has a non-empty
>>>>>> default String?
>>>>>>
>>>>>> Please let me know.
>>>>>> Thanks.
>>>>>> Shing Wai Chan
>>>>>>
>>>>>>
>>>>>
>>>