Hi Robert,
2) I tried your way, it doesn't work; it doesn't work even back to 5.0.18.
3) I don't think the get/set methods would work for parameters; look
at ParameterWorker class, it's fairly complicated because of the
implementation of the binding magic.
Thanks,
Richard
On Thu, Feb 12, 2009 at 2:56 PM, Robert Zeigler <robe...@scazdl.org> wrote:
> 1) Since Child extends Parent, it already has a name @Parameter.
> 2) If you want to provide the default in the child, you can always provide
> the "default" method:
> String defaultName() {
> return "Tom";
> }
> 3) Otherwise, access in the child via code is mediated through normal java
> channels: create a public (or protected) getter and setter in the Parent
> class.
>
> Robert
>
> On Feb 12, 2009, at 2/1212:45 PM , Yunhua Sang wrote:
>
>> Hi Howard,
>>
>> Can you show me in a child component, how to access a parameter
>> defined in parent by using another way? I cannot find api which isn't
>> internal about it. By the way, seems it's also diffcult to provide
>> default binding for a parameter within parent because function
>> bindParameter(String parameterName, Binding binding) is internal as
>> well.
>>
>> Thanks,
>> Yunhua
>>
>> On Thu, Feb 12, 2009 at 11:10 AM, Howard Lewis Ship <hls...@gmail.com>
>> wrote:
>>>
>>> It looks to me like theres an ambiguity here: I don't think a child
>>> component should be allowed to declare a second parameter, "name" in
>>> this example, that is already defined in a super-class.
>>>
>>> On Wed, Feb 11, 2009 at 12:20 PM, Yunhua Sang <yunhua.s...@gmail.com>
>>> wrote:
>>>>
>>>> Hello Howard,
>>>>
>>>> It turns out the error occurs only when the child wants to provide its
>>>> own default binding for a parameter originally defined in parent;
>>>> example:
>>>>
>>>> public class Parent {
>>>> @Parameter
>>>> private String name;
>>>> void setupRender() {
>>>> name.toUpperCase(); // NPE happens here
>>>> }
>>>> }
>>>>
>>>> public class Child extends Parent{
>>>> @Parameter("prop:name")
>>>> private String name;
>>>> public String getName() {
>>>> return "Tom";
>>>> }
>>>> }
>>>>
>>>> Page class:
>>>> public class ChildExample {
>>>> @Component
>>>> private Child child;
>>>> }
>>>>
>>>> Template ChildExample.tml:
>>>> <html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";>
>>>> <h3>Test</h3>
>>>> <t:child t:id="child"/>
>>>> </html>
>>>>
>>>> I am sorry for my previous inaccurate information and thanks for
>>>> looking into it.
>>>>
>>>> Yunhua
>>>>
>>>>
>>>> On Wed, Feb 11, 2009 at 2:15 PM, Howard Lewis Ship <hls...@gmail.com>
>>>> wrote:
>>>>>
>>>>> I'm not aware of anything that's changed in this area; could you
>>>>> elaborate?
>>>>>
>>>>> On Wed, Feb 11, 2009 at 10:56 AM, Yunhua Sang <yunhua.s...@gmail.com>
>>>>> wrote:
>>>>>>
>>>>>> Hello all,
>>>>>>
>>>>>> It seems there is no clear document about how to access a parameter
>>>>>> defined in parent component; previous to 5.0.18, I was using the way
>>>>>> of declaring the parameter again in child class and it worked well;
>>>>>> however looks like some changes in 5.1.0.0 broke the way, seems there
>>>>>> is no link between the parameter with same name in parent and child
>>>>>> now.
>>>>>>
>>>>>> The problem is when I am USING a tapestry component, it's such a
>>>>>> comfortable experience; but when I write a sub-class of a component, I
>>>>>> am getting frustrated: a lot of methods are package visible; there is
>>>>>> no clear way for parameter manipulation, a typical question: can I
>>>>>> update an attibute of parameter in parent class? If inheritance is not
>>>>>> a good practice in Tapestry, there should be a document about it.
>>>>>>
>>>>>> Thanks in advance for any help,
>>>>>> Yunhua
>>>>>>
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>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Howard M. Lewis Ship
>>>>>
>>>>> Creator Apache Tapestry and Apache HiveMind
>>>>>
>>>>> ---------------------------------------------------------------------
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>>>>>
>>>>>
>>>>
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>>>>
>>>>
>>>
>>>
>>>
>>> --
>>> Howard M. Lewis Ship
>>>
>>> Creator Apache Tapestry and Apache HiveMind
>>>
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>>>
>>>
>>
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