Sebastián: You may already be aware of this, but when I first looked
into this problem it was a subtlety I had overlooked.
If you have -
interface A { void a();}
interface B extends A { void b(); }
interface C extends A { void c(); }
You can't have -
final class BImpl implements B {
void a() { ... }
void b() { ... }
}
final class CImpl implements C {
void a() { ... }
void c() { ... }
}
Because as has been pointed out "a" would be implemented twice.
However, you can have -
final abstract class AImpl implements A {
void a() { ... }
}
final abstract class BImpl extends A implements B {
void b() { ... }
}
final abstract class CImpl extends A implements C {
void c() { ... }
}
Because in this case "a" is only implemented once.
It may not help but when I was wrapping a third-party lib, I found the
above pattern worked almost everywhere.
Chris
On Fri, Sep 7, 2012 at 4:53 PM, Alain Ekambi <[email protected]> wrote:
> " Your approach however would make this kind of Java API much more
> confortable to Java users "
>
> Is nt it why you are wrapping YUI in the first place ? To make it
> confortable for Java users ?
>
>
> 2012/9/7 Sebastián Gurin <[email protected]>
>>
>> Thanks Paul, Nino and Thomas
>>
>> Paul: yes I suppose that too, but interfaces do not implement methods, so
>> I thought it is strange.
>>
>> Nino: I do not want to make object wrapping as you suggested because I
>> want my library user's to use the overlay types directly for a zero-overhead
>> API. Your approach however would make this kind of Java API much more
>> confortable to Java users.
>>
>> Thomas, thanks. Yes I'm using .cast() a lot, it is much more confortable
>> than java casting. Also I have designed this YUI java API to be the most
>> similar to the native javascript API. So code using mine YUIGWT will look
>> strange to java programmers, for example, a js literal object definition :
>>
>> in javascrpt:
>>
>> var p = {name: "seba", age: 28}
>>
>> in java:
>> Person p = Person.create().name("seba").age(28);
>>
>>
>> On Thursday, September 6, 2012 3:22:16 PM UTC-3, Sebastián Gurin wrote:
>>>
>>> Hi all. I'm writing a lot of GWT overlay types for my new project YUIGWT
>>> - http://code.google.com/p/yuigwt/. I'm creating a nice and rich java
>>> hierarchy of overlay types there.
>>>
>>> Today I discovered that it is not good to let overlay types (extends
>>> JavaScriptObject implement interfaces because it seems that for a certain
>>> interface, no more than one overlay type can implement its methods. The
>>> error in question is pasted below, but this arrises a big question for me:
>>>
>>> While I understand perfectly what the error means, I would really
>>> appreciate if somebody can explain me the reasons behind this nasty
>>> restriction ? ??
>>>
>>> [ERROR] [org.sgx.yuigwt.YuiGwtTestOnline] - Line 9: Only one
>>> JavaScriptObject type may implement the methods of an interface that
>>> declared methods. The interface (org.sgx.yuigwt.yui.yql.api.YQLQueryResult)
>>> is implemented by both (org.sgx.yuigwt.yui.yql.api.desc.DescResult) and
>>> (org.sgx.yuigwt.yui.yql.api.wheather.forecast.WheatherForecastResult)
>>>
>>> Thanks in advance.
>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "Google Web Toolkit" group.
>> To view this discussion on the web visit
>> https://groups.google.com/d/msg/google-web-toolkit/-/GAl_l1hUSQkJ.
>>
>> To post to this group, send email to [email protected].
>> To unsubscribe from this group, send email to
>> [email protected].
>> For more options, visit this group at
>> http://groups.google.com/group/google-web-toolkit?hl=en.
>
>
> --
> You received this message because you are subscribed to the Google Groups
> "Google Web Toolkit" group.
> To post to this group, send email to [email protected].
> To unsubscribe from this group, send email to
> [email protected].
> For more options, visit this group at
> http://groups.google.com/group/google-web-toolkit?hl=en.
--
You received this message because you are subscribed to the Google Groups
"Google Web Toolkit" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/google-web-toolkit?hl=en.
