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Posted to users@isis.apache.org by Vishma Senadhi Dias <vi...@cse.mrt.ac.lk> on 2016/02/23 07:30:17 UTC
Overriding a field in a view model
Hi all,
I have a jaxb annotated view model which have several fields with
getters and setters. I want to override the getter of a specific field
so that different value will appear on the UI. But the original getter
should not be changed.
example:
|public class LibraryMember { private String bookType; public String
getBookType() { ... } public void setBoookType(String bookType) { ... } }|
In the above example, can I override getBookType() so that a different
value will render on the wicket viewer? I should be able to update the
getter like this,
|public String updateBookType( if(this.getBookType.equals("N")) return
"novel"; else return "Misc"; }|
I have restrictions like I cannot change the original class. Can I use a
DomainService or some other inbuilt implementation of ISIS to achieve my
objective without altering my original class?
Any help would be highly appreciated.
Thanks in advance,
Vishma.
Re: Overriding a field in a view model
Posted by Vishma Senadhi Dias <vi...@cse.mrt.ac.lk>.
Thanks Dan. It worked. Using a mixin is much better for my approach.
Thanks a lot.
On 2/23/2016 12:15 PM, Dan Haywood wrote:
> Hi Vishma,
>
> It you can't change the original class - because it was written for some
> other purpose - then perhaps it might be better to wrap it in a view model
> of your own control. I'm not certain that overriding getBookType() is
> going to work, because it would impact any other users of that view model.
>
> One way to achieve your objective would be to use LibraryMember.layout.json
> to hide the original getBookType(), and then define a mixin to expose your
> decode.
>
> @Mixin
> public class LibraryMember_decodedBookType {
> private final LibraryMember libraryMember;
> public LibraryMember_decodedBookType(LibraryMember lm) {
> this.libraryMember = lm; }
>
> @Action(semanticsOf=SAFE)
> @ActionLayout(contributed=AS.Association)
> public String bookTypeDecoded() {
> return libraryMember.getBookType().equals("N") ? "Novel": "Misc";
> }
> }
>
> HTH
> Dan
>
>
>
>
>
>
> On 23 February 2016 at 06:30, Vishma Senadhi Dias <vi...@cse.mrt.ac.lk>
> wrote:
>
>> Hi all,
>>
>> I have a jaxb annotated view model which have several fields with getters
>> and setters. I want to override the getter of a specific field so that
>> different value will appear on the UI. But the original getter should not
>> be changed.
>>
>> example:
>>
>> |public class LibraryMember { private String bookType; public String
>> getBookType() { ... } public void setBoookType(String bookType) { ... } }|
>>
>>
>> In the above example, can I override getBookType() so that a different
>> value will render on the wicket viewer? I should be able to update the
>> getter like this,
>>
>> |public String updateBookType( if(this.getBookType.equals("N")) return
>> "novel"; else return "Misc"; }|
>>
>>
>>
>> I have restrictions like I cannot change the original class. Can I use a
>> DomainService or some other inbuilt implementation of ISIS to achieve my
>> objective without altering my original class?
>> Any help would be highly appreciated.
>>
>> Thanks in advance,
>> Vishma.
>>
Re: Overriding a field in a view model
Posted by Vishma Senadhi Dias <vi...@cse.mrt.ac.lk>.
Thanks for the information. I will write a separate mixin for each
field. Got it.
On 2/25/2016 4:53 PM, Dan Haywood wrote:
> Each mixin contributes a single member; so write new mixins for those other
> fields to be decoded.
>
> You'll see I'm using the technique in this code [1] currently under
> development.
>
> HTH
> Dan
>
> [1]
> https://github.com/apache/isis/tree/ISIS-993/core/metamodel/src/main/java/org/apache/isis/core/metamodel/services/jdosupport
>
>
>
> On 25 February 2016 at 11:13, Vishma Senadhi Dias <vi...@cse.mrt.ac.lk>
> wrote:
>
>> Hi Dan,
>>
>> Following your method I was able to override BookType field in the
>> LibrayMember using Mixins. But when I try to override more than one field
>> in the LibrayMember class using Mixins it seems that only one fields is
>> shown in the UI.
>>
>> For an example when I code like below, only the last field is shown.
>>
>> @Mixin
>> public class LibraryMember_decodedBookType {
>> private final LibraryMember libraryMember;
>> public LibraryMember_decodedBookType(LibraryMember lm) {
>> this.libraryMember = lm; }
>>
>> @Action(semanticsOf=SAFE)
>> @ActionLayout(contributed=AS.Association)
>> public String bookTypeDecoded() {
>> return libraryMember.getBookType().equals("N") ? "Novel": "Misc";
>> }
>>
>>
>> @Action(semanticsOf=SAFE)
>> @ActionLayout(contributed=AS.Association)
>> public boolean Field1Decoded() {
>> ...
>> }
>>
>> @Action(semanticsOf=SAFE)
>> @ActionLayout(contributed=AS.Association)
>> public boolean Field2Decoded() {
>> ...
>> }
>>
>>
>> ...
>> }
>>
>>
>> Can you suggest me a way to fix this and how to edit the JSON to customize
>> the layout.
>>
>>
>>
>>
>>
>> On 2/23/2016 12:15 PM, Dan Haywood wrote:
>>
>>> Hi Vishma,
>>>
>>> It you can't change the original class - because it was written for some
>>> other purpose - then perhaps it might be better to wrap it in a view model
>>> of your own control. I'm not certain that overriding getBookType() is
>>> going to work, because it would impact any other users of that view model.
>>>
>>> One way to achieve your objective would be to use
>>> LibraryMember.layout.json
>>> to hide the original getBookType(), and then define a mixin to expose your
>>> decode.
>>>
>>> @Mixin
>>> public class LibraryMember_decodedBookType {
>>> private final LibraryMember libraryMember;
>>> public LibraryMember_decodedBookType(LibraryMember lm) {
>>> this.libraryMember = lm; }
>>>
>>> @Action(semanticsOf=SAFE)
>>> @ActionLayout(contributed=AS.Association)
>>> public String bookTypeDecoded() {
>>> return libraryMember.getBookType().equals("N") ? "Novel":
>>> "Misc";
>>> }
>>> }
>>>
>>> HTH
>>> Dan
>>>
>>>
>>>
>>>
>>>
>>>
>>> On 23 February 2016 at 06:30, Vishma Senadhi Dias <
>>> vishma.12@cse.mrt.ac.lk>
>>> wrote:
>>>
>>> Hi all,
>>>> I have a jaxb annotated view model which have several fields with getters
>>>> and setters. I want to override the getter of a specific field so that
>>>> different value will appear on the UI. But the original getter should not
>>>> be changed.
>>>>
>>>> example:
>>>>
>>>> |public class LibraryMember { private String bookType; public String
>>>> getBookType() { ... } public void setBoookType(String bookType) { ... }
>>>> }|
>>>>
>>>>
>>>> In the above example, can I override getBookType() so that a different
>>>> value will render on the wicket viewer? I should be able to update the
>>>> getter like this,
>>>>
>>>> |public String updateBookType( if(this.getBookType.equals("N")) return
>>>> "novel"; else return "Misc"; }|
>>>>
>>>>
>>>>
>>>> I have restrictions like I cannot change the original class. Can I use a
>>>> DomainService or some other inbuilt implementation of ISIS to achieve my
>>>> objective without altering my original class?
>>>> Any help would be highly appreciated.
>>>>
>>>> Thanks in advance,
>>>> Vishma.
>>>>
>>>>
Re: Overriding a field in a view model
Posted by Dan Haywood <da...@haywood-associates.co.uk>.
Each mixin contributes a single member; so write new mixins for those other
fields to be decoded.
You'll see I'm using the technique in this code [1] currently under
development.
HTH
Dan
[1]
https://github.com/apache/isis/tree/ISIS-993/core/metamodel/src/main/java/org/apache/isis/core/metamodel/services/jdosupport
On 25 February 2016 at 11:13, Vishma Senadhi Dias <vi...@cse.mrt.ac.lk>
wrote:
> Hi Dan,
>
> Following your method I was able to override BookType field in the
> LibrayMember using Mixins. But when I try to override more than one field
> in the LibrayMember class using Mixins it seems that only one fields is
> shown in the UI.
>
> For an example when I code like below, only the last field is shown.
>
> @Mixin
> public class LibraryMember_decodedBookType {
> private final LibraryMember libraryMember;
> public LibraryMember_decodedBookType(LibraryMember lm) {
> this.libraryMember = lm; }
>
> @Action(semanticsOf=SAFE)
> @ActionLayout(contributed=AS.Association)
> public String bookTypeDecoded() {
> return libraryMember.getBookType().equals("N") ? "Novel": "Misc";
> }
>
>
> @Action(semanticsOf=SAFE)
> @ActionLayout(contributed=AS.Association)
> public boolean Field1Decoded() {
> ...
> }
>
> @Action(semanticsOf=SAFE)
> @ActionLayout(contributed=AS.Association)
> public boolean Field2Decoded() {
> ...
> }
>
>
> ...
> }
>
>
> Can you suggest me a way to fix this and how to edit the JSON to customize
> the layout.
>
>
>
>
>
> On 2/23/2016 12:15 PM, Dan Haywood wrote:
>
>> Hi Vishma,
>>
>> It you can't change the original class - because it was written for some
>> other purpose - then perhaps it might be better to wrap it in a view model
>> of your own control. I'm not certain that overriding getBookType() is
>> going to work, because it would impact any other users of that view model.
>>
>> One way to achieve your objective would be to use
>> LibraryMember.layout.json
>> to hide the original getBookType(), and then define a mixin to expose your
>> decode.
>>
>> @Mixin
>> public class LibraryMember_decodedBookType {
>> private final LibraryMember libraryMember;
>> public LibraryMember_decodedBookType(LibraryMember lm) {
>> this.libraryMember = lm; }
>>
>> @Action(semanticsOf=SAFE)
>> @ActionLayout(contributed=AS.Association)
>> public String bookTypeDecoded() {
>> return libraryMember.getBookType().equals("N") ? "Novel":
>> "Misc";
>> }
>> }
>>
>> HTH
>> Dan
>>
>>
>>
>>
>>
>>
>> On 23 February 2016 at 06:30, Vishma Senadhi Dias <
>> vishma.12@cse.mrt.ac.lk>
>> wrote:
>>
>> Hi all,
>>>
>>> I have a jaxb annotated view model which have several fields with getters
>>> and setters. I want to override the getter of a specific field so that
>>> different value will appear on the UI. But the original getter should not
>>> be changed.
>>>
>>> example:
>>>
>>> |public class LibraryMember { private String bookType; public String
>>> getBookType() { ... } public void setBoookType(String bookType) { ... }
>>> }|
>>>
>>>
>>> In the above example, can I override getBookType() so that a different
>>> value will render on the wicket viewer? I should be able to update the
>>> getter like this,
>>>
>>> |public String updateBookType( if(this.getBookType.equals("N")) return
>>> "novel"; else return "Misc"; }|
>>>
>>>
>>>
>>> I have restrictions like I cannot change the original class. Can I use a
>>> DomainService or some other inbuilt implementation of ISIS to achieve my
>>> objective without altering my original class?
>>> Any help would be highly appreciated.
>>>
>>> Thanks in advance,
>>> Vishma.
>>>
>>>
>
Re: Overriding a field in a view model
Posted by Vishma Senadhi Dias <vi...@cse.mrt.ac.lk>.
Hi Dan,
Following your method I was able to override BookType field in the
LibrayMember using Mixins. But when I try to override more than one
field in the LibrayMember class using Mixins it seems that only one
fields is shown in the UI.
For an example when I code like below, only the last field is shown.
@Mixin
public class LibraryMember_decodedBookType {
private final LibraryMember libraryMember;
public LibraryMember_decodedBookType(LibraryMember lm) {
this.libraryMember = lm; }
@Action(semanticsOf=SAFE)
@ActionLayout(contributed=AS.Association)
public String bookTypeDecoded() {
return libraryMember.getBookType().equals("N") ? "Novel": "Misc";
}
@Action(semanticsOf=SAFE)
@ActionLayout(contributed=AS.Association)
public boolean Field1Decoded() {
...
}
@Action(semanticsOf=SAFE)
@ActionLayout(contributed=AS.Association)
public boolean Field2Decoded() {
...
}
...
}
Can you suggest me a way to fix this and how to edit the JSON to
customize the layout.
On 2/23/2016 12:15 PM, Dan Haywood wrote:
> Hi Vishma,
>
> It you can't change the original class - because it was written for some
> other purpose - then perhaps it might be better to wrap it in a view model
> of your own control. I'm not certain that overriding getBookType() is
> going to work, because it would impact any other users of that view model.
>
> One way to achieve your objective would be to use LibraryMember.layout.json
> to hide the original getBookType(), and then define a mixin to expose your
> decode.
>
> @Mixin
> public class LibraryMember_decodedBookType {
> private final LibraryMember libraryMember;
> public LibraryMember_decodedBookType(LibraryMember lm) {
> this.libraryMember = lm; }
>
> @Action(semanticsOf=SAFE)
> @ActionLayout(contributed=AS.Association)
> public String bookTypeDecoded() {
> return libraryMember.getBookType().equals("N") ? "Novel": "Misc";
> }
> }
>
> HTH
> Dan
>
>
>
>
>
>
> On 23 February 2016 at 06:30, Vishma Senadhi Dias <vi...@cse.mrt.ac.lk>
> wrote:
>
>> Hi all,
>>
>> I have a jaxb annotated view model which have several fields with getters
>> and setters. I want to override the getter of a specific field so that
>> different value will appear on the UI. But the original getter should not
>> be changed.
>>
>> example:
>>
>> |public class LibraryMember { private String bookType; public String
>> getBookType() { ... } public void setBoookType(String bookType) { ... } }|
>>
>>
>> In the above example, can I override getBookType() so that a different
>> value will render on the wicket viewer? I should be able to update the
>> getter like this,
>>
>> |public String updateBookType( if(this.getBookType.equals("N")) return
>> "novel"; else return "Misc"; }|
>>
>>
>>
>> I have restrictions like I cannot change the original class. Can I use a
>> DomainService or some other inbuilt implementation of ISIS to achieve my
>> objective without altering my original class?
>> Any help would be highly appreciated.
>>
>> Thanks in advance,
>> Vishma.
>>
Re: Overriding a field in a view model
Posted by Dan Haywood <da...@haywood-associates.co.uk>.
Hi Vishma,
It you can't change the original class - because it was written for some
other purpose - then perhaps it might be better to wrap it in a view model
of your own control. I'm not certain that overriding getBookType() is
going to work, because it would impact any other users of that view model.
One way to achieve your objective would be to use LibraryMember.layout.json
to hide the original getBookType(), and then define a mixin to expose your
decode.
@Mixin
public class LibraryMember_decodedBookType {
private final LibraryMember libraryMember;
public LibraryMember_decodedBookType(LibraryMember lm) {
this.libraryMember = lm; }
@Action(semanticsOf=SAFE)
@ActionLayout(contributed=AS.Association)
public String bookTypeDecoded() {
return libraryMember.getBookType().equals("N") ? "Novel": "Misc";
}
}
HTH
Dan
On 23 February 2016 at 06:30, Vishma Senadhi Dias <vi...@cse.mrt.ac.lk>
wrote:
> Hi all,
>
> I have a jaxb annotated view model which have several fields with getters
> and setters. I want to override the getter of a specific field so that
> different value will appear on the UI. But the original getter should not
> be changed.
>
> example:
>
> |public class LibraryMember { private String bookType; public String
> getBookType() { ... } public void setBoookType(String bookType) { ... } }|
>
>
> In the above example, can I override getBookType() so that a different
> value will render on the wicket viewer? I should be able to update the
> getter like this,
>
> |public String updateBookType( if(this.getBookType.equals("N")) return
> "novel"; else return "Misc"; }|
>
>
>
> I have restrictions like I cannot change the original class. Can I use a
> DomainService or some other inbuilt implementation of ISIS to achieve my
> objective without altering my original class?
> Any help would be highly appreciated.
>
> Thanks in advance,
> Vishma.
>