RE: Handling Date objects in ActionForm gracefully
As someone with good experience in MVC-based applications but a newbie
to Struts, what I understand from this discussion is that the
recommended implementation would have to comply, at least, with this
guidelines:
- The conversion code is encapsulated in a separate class (I suppose one
converter class per each String, Target Data Type combination
required, right?).
- Passes all (String) parameters to a Business Object that encapsulates
the use case (I mean, the logic) and, from within that BO, use the
corresponding converter classes for getting the actual data object to
flow around (i.e. be eventually get-ed or set-ed from the DAOs/DTOs, bla
bla bla...)
I'm I right here or am I missing any other IMPORTANT aspect(s)?
STILL, there is something I don't get: how would you implement /
encapsulate then the opposite direction for data conversion; in other
words:
- Convert from original data types towards String (another method in
the same converter class?)
- Map (set) some (non-String) data object into the corresponding String
property on the form bean.
Thanks,
Freddy.
-Mensaje original-
De: Mark Lowe [mailto:[EMAIL PROTECTED]
Enviado el: viernes, 26 de marzo de 2004 0:59
Para: Sreenivasa Chadalavada; Struts Users Mailing List
Asunto: Re: Handling Date objects in ActionForm gracefully
You deal with the conversion else where but not in the form bean, you
can argue about it or just believe me. The action form sits between the
view and the action, the date conversion goes on between the action and
the model.
Your approach isn't that bad its just not to the MVC pattern that
struts follows (not that its the only one).
Create a date convertion util class or something.
If you dont want to take my word for it here's what craig had to say
albeit in response to a different question
snippet
As the original designer of Struts :-), I must point out that the
design of
ActionForm (and the recommendation that form bean properties be
Strings) is
***very*** deliberate. The reason this is needed is obvious when you
consider
the following use case:
* You have an input form that, say, accepts only integers.
* Your form bean property is of type int.
* The user types 1b3 instead of 123, by accident.
* Based on experience with any garden variety GUI application,
the user will expect that they receive an error message,
plus a redisplay of the form ***WITH THE INCORRECT VALUES
THAT WERE ENTERED DISPLAYED SO THE USER CAN CORRECT THEM***.
* The current Struts environment will throw an exception
due to the conversion failure.
* The suggested solution will ***hopelessly*** confuse the
nature of a form bean, which is part of the VIEW tier, with
model beans that have native data types.
Struts does not include any sort of user interface component model
where the
details of conversion are hidden inside the user interface component.
If that
is what you are after, you should look at a *real* user interface
component
model (such as using JavaServer Faces with a Struts application).
Corrupting
the functionality of a form bean to *pretend* that it is a user
interface
component is only going to create complications for the world.
/snippet
I hope this helps
Mark
On 25 Mar 2004, at 21:26, Sreenivasa Chadalavada wrote:
Application Tier is strongly typed.
So if the field is a java.util.Date in the database, then the data
object will have the method
public DataObject{
public java.util.Date getAsOfDate()
public void setAsOfDate(java.util.Date asOfDate) methods.
}
My Action form is:
public MyActionForm extends ActionForm{
public DataObject getDataObject();
public void setDataObject(DataObject dataObject);
}
My jsp contains
html:text property=dataObject.asOfDate/
This will fail if the user does not enter any date. I want the
(changed) struts framework to handle that.
I did not want to create a new method with type String for every Date
field
Hope this explanation helps !!
Thanks and Regards,
Sree/-
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Mark Lowe mark.lowe
@boxstuff.com
03/25/2004 03:17 PM
Please respond to Struts Users Mailing List
To: Struts Users Mailing List
[EMAIL PROTECTED]
cc:
Subject: Re: Handling Date objects in ActionForm
gracefully
Ask yourself why are you trying to convert
RE: Handling Date objects in ActionForm gracefully
+1 I also suggest this approach to keep the date as string during posts and convert them to date object when porcessing the entered dates, surely not in the Form. Depends on what you really want to achieve. Would suggest the KISS rule..:-) Robert Taylor [EMAIL PROTECTED] on 03/25/2004 08:53:31 PM Please respond to Struts Users Mailing List [EMAIL PROTECTED] To: Struts Users Mailing List [EMAIL PROTECTED] cc:(bcc: Anuj Upadhyay/Jeppesen/TMC) Subject: RE: Handling Date objects in ActionForm gracefully +1 -Original Message- From: Mark Lowe [mailto:[EMAIL PROTECTED] Sent: Thursday, March 25, 2004 2:36 PM To: Struts Users Mailing List Subject: Re: Handling Date objects in ActionForm gracefully Have it as a string and convert it to a date or calendar when you pass it back to the model. On 25 Mar 2004, at 20:28, Sreenivasa Chadalavada wrote: All, We are facing a problem when we define java.util.Date field in ActionForm. Is there any way to override the default behavior provided by Struts? I very much appreciate your help!! Thanks and Regards, Sree/- --- - This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. --- - - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Handling Date objects in ActionForm gracefully
I think the way of going about converting is pretty open, either have
some conversion utils between the web tier and the model. I tend to do
it in the action and then when things get long or i need the code again
move it out into a util class or like you're saying make my model util
classes deal with strings (this makes a lot of sense as then other
front ends can be plugged on).
Talk of MVC aside (after all MVC is a broader issue than the particular
pattern that struts is based on) why piss about dealing with all sorts
of errors and exceptions being thrown in the place where its hardest to
deal with them?
You can and people do use different types for form beans, but I just
don't see the point. Date comes up often and lets face it dates are
more user friendly as dropdown menus rather than free text, so
getDay() , getMonth() and getYear() IMO are a simpler way of going
about things. Then have methods in you model that create a date based
on that, or have a util class in the web tier as you can deal with
validating the three values. Perhaps even have a date that's in you
form bean but is set and got (passed participle of get) via string
flavors day, month and year.
Not sure if this works but I think the idea is valid (corrections
welcome).
public class SomeForm extends ActionForm {
private Calendar aDate = Calender.instance();
public String getDay() {
int d = aDate.get(Calendar. DAY_OF_MONTH);
return Integer.toString(d);
}
public void setDay(String day) {
aDate.set(Calendar.DAY_OF_MONTH,Integer.parseInt(day));
}
...
protected Date getAdate() {
return dDate.getTime();
}
}
This way come checking and comparing values before can be done, before
passing anything up to you model. Many folk would say that this should
be done in the model, but i'd say situations where you need to check if
a user has entered a valid date (e.g. expire and from dates with a
credit card).
This functionality will want to be produced even if you change the
model , if you wanted to demo your web tier on its own (without a model
e.g acme ltd credit card form) and therefore doing it ONLY in the
model would be limited.
Very much IMO and I'm not MVC guru, but that's my understanding.
On 26 Mar 2004, at 09:43, Freddy Villalba Arias wrote:
As someone with good experience in MVC-based applications but a newbie
to Struts, what I understand from this discussion is that the
recommended implementation would have to comply, at least, with this
guidelines:
- The conversion code is encapsulated in a separate class (I suppose
one
converter class per each String, Target Data Type combination
required, right?).
- Passes all (String) parameters to a Business Object that encapsulates
the use case (I mean, the logic) and, from within that BO, use the
corresponding converter classes for getting the actual data object to
flow around (i.e. be eventually get-ed or set-ed from the DAOs/DTOs,
bla
bla bla...)
I'm I right here or am I missing any other IMPORTANT aspect(s)?
STILL, there is something I don't get: how would you implement /
encapsulate then the opposite direction for data conversion; in other
words:
- Convert from original data types towards String (another method in
the same converter class?)
- Map (set) some (non-String) data object into the corresponding String
property on the form bean.
Thanks,
Freddy.
-Mensaje original-
De: Mark Lowe [mailto:[EMAIL PROTECTED]
Enviado el: viernes, 26 de marzo de 2004 0:59
Para: Sreenivasa Chadalavada; Struts Users Mailing List
Asunto: Re: Handling Date objects in ActionForm gracefully
You deal with the conversion else where but not in the form bean, you
can argue about it or just believe me. The action form sits between the
view and the action, the date conversion goes on between the action and
the model.
Your approach isn't that bad its just not to the MVC pattern that
struts follows (not that its the only one).
Create a date convertion util class or something.
If you dont want to take my word for it here's what craig had to say
albeit in response to a different question
snippet
As the original designer of Struts :-), I must point out that the
design of
ActionForm (and the recommendation that form bean properties be
Strings) is
***very*** deliberate. The reason this is needed is obvious when you
consider
the following use case:
* You have an input form that, say, accepts only integers.
* Your form bean property is of type int.
* The user types 1b3 instead of 123, by accident.
* Based on experience with any garden variety GUI application,
the user will expect that they receive an error message,
plus a redisplay of the form ***WITH THE INCORRECT VALUES
THAT WERE ENTERED DISPLAYED SO THE USER CAN CORRECT THEM***.
* The current Struts environment will throw an exception
due to the conversion failure.
* The suggested solution
RE: Handling Date objects in ActionForm gracefully
Since I just wrestled greatly with this particular beast, my $.02 follows.
Subclass whatever flavor of ActionForm you use, and give it a method with a
footprint like-
java.util.Date StringToDate(String)
{
}
This way you can do something like this in your action:
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception
{
Myform mf = (Myform) form;
BizObject bo = new BizObject();
String dateText = mf.getDateString();
bo.setDate(mf.StringToDate(dateText);
// etc
}
This works very well unless internationalizing your app because the converter
needs a DateFormat defined to read the String correctly. And I am, so I need
to come up with something.
I don't suppose there is a version of BeanUtils that lets the user pass a
DateFormat into copyProperties :-)???
-Joe
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Friday, March 26, 2004 3:58 AM
To: Struts Users Mailing List
Subject: RE: Handling Date objects in ActionForm gracefully
+1
I also suggest this approach to keep the date as string
during posts and convert them to date object when porcessing
the entered dates, surely not in the Form.
Depends on what you really want to achieve. Would suggest
the KISS rule..:-)
Robert Taylor [EMAIL PROTECTED] on 03/25/2004 08:53:31 PM
Please respond to Struts Users Mailing List
[EMAIL PROTECTED]
To: Struts Users Mailing List [EMAIL PROTECTED]
cc:(bcc: Anuj Upadhyay/Jeppesen/TMC)
Subject: RE: Handling Date objects in ActionForm gracefully
+1
-Original Message-
From: Mark Lowe [mailto:[EMAIL PROTECTED]
Sent: Thursday, March 25, 2004 2:36 PM
To: Struts Users Mailing List
Subject: Re: Handling Date objects in ActionForm gracefully
Have it as a string and convert it to a date or calendar
when you pass
it back to the model.
On 25 Mar 2004, at 20:28, Sreenivasa Chadalavada wrote:
All,
We are facing a problem when we define java.util.Date field in
ActionForm.
Is there any way to override the default behavior provided by
Struts?
I very much appreciate your help!!
Thanks and Regards,
Sree/-
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please
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RE: Handling Date objects in ActionForm gracefully
Mark, didn't mean to be pedantic... just wanted to prevent everybody
from going through all the (obvious / basic / simple) details and just
go to the important stuff. Neither am I an MVC guru.
In any case, thanx everybody 4 your help.
Regards,
Freddy.
-Mensaje original-
De: Mark Lowe [mailto:[EMAIL PROTECTED]
Enviado el: viernes, 26 de marzo de 2004 10:24
Para: Struts Users Mailing List
Asunto: Re: Handling Date objects in ActionForm gracefully
I think the way of going about converting is pretty open, either have
some conversion utils between the web tier and the model. I tend to do
it in the action and then when things get long or i need the code again
move it out into a util class or like you're saying make my model util
classes deal with strings (this makes a lot of sense as then other
front ends can be plugged on).
Talk of MVC aside (after all MVC is a broader issue than the particular
pattern that struts is based on) why piss about dealing with all sorts
of errors and exceptions being thrown in the place where its hardest to
deal with them?
You can and people do use different types for form beans, but I just
don't see the point. Date comes up often and lets face it dates are
more user friendly as dropdown menus rather than free text, so
getDay() , getMonth() and getYear() IMO are a simpler way of going
about things. Then have methods in you model that create a date based
on that, or have a util class in the web tier as you can deal with
validating the three values. Perhaps even have a date that's in you
form bean but is set and got (passed participle of get) via string
flavors day, month and year.
Not sure if this works but I think the idea is valid (corrections
welcome).
public class SomeForm extends ActionForm {
private Calendar aDate = Calender.instance();
public String getDay() {
int d = aDate.get(Calendar. DAY_OF_MONTH);
return Integer.toString(d);
}
public void setDay(String day) {
aDate.set(Calendar.DAY_OF_MONTH,Integer.parseInt(day));
}
...
protected Date getAdate() {
return dDate.getTime();
}
}
This way come checking and comparing values before can be done, before
passing anything up to you model. Many folk would say that this should
be done in the model, but i'd say situations where you need to check if
a user has entered a valid date (e.g. expire and from dates with a
credit card).
This functionality will want to be produced even if you change the
model , if you wanted to demo your web tier on its own (without a model
e.g acme ltd credit card form) and therefore doing it ONLY in the
model would be limited.
Very much IMO and I'm not MVC guru, but that's my understanding.
On 26 Mar 2004, at 09:43, Freddy Villalba Arias wrote:
As someone with good experience in MVC-based applications but a newbie
to Struts, what I understand from this discussion is that the
recommended implementation would have to comply, at least, with this
guidelines:
- The conversion code is encapsulated in a separate class (I suppose
one
converter class per each String, Target Data Type combination
required, right?).
- Passes all (String) parameters to a Business Object that
encapsulates
the use case (I mean, the logic) and, from within that BO, use the
corresponding converter classes for getting the actual data object
to
flow around (i.e. be eventually get-ed or set-ed from the DAOs/DTOs,
bla
bla bla...)
I'm I right here or am I missing any other IMPORTANT aspect(s)?
STILL, there is something I don't get: how would you implement /
encapsulate then the opposite direction for data conversion; in other
words:
- Convert from original data types towards String (another method in
the same converter class?)
- Map (set) some (non-String) data object into the corresponding
String
property on the form bean.
Thanks,
Freddy.
-Mensaje original-
De: Mark Lowe [mailto:[EMAIL PROTECTED]
Enviado el: viernes, 26 de marzo de 2004 0:59
Para: Sreenivasa Chadalavada; Struts Users Mailing List
Asunto: Re: Handling Date objects in ActionForm gracefully
You deal with the conversion else where but not in the form bean, you
can argue about it or just believe me. The action form sits between
the
view and the action, the date conversion goes on between the action
and
the model.
Your approach isn't that bad its just not to the MVC pattern that
struts follows (not that its the only one).
Create a date convertion util class or something.
If you dont want to take my word for it here's what craig had to say
albeit in response to a different question
snippet
As the original designer of Struts :-), I must point out that the
design of
ActionForm (and the recommendation that form bean properties be
Strings) is
***very*** deliberate. The reason this is needed is obvious when you
consider
the following use case
Re: Handling Date objects in ActionForm gracefully
Freddy. No, you misunderstood if you thought I was responding with any
hostility whatsoever.
There is a general problem where input would be better validated in the
web tier so it can be decoupled from the model. So times comparing two
dates would be useful and so on. But i think its also try to say that
using anything but strings for user input will lead to problems.
And my suggestion could well be incorrect, I was putting it out there
to see what response it would provoke.
Cheers Mark
On 26 Mar 2004, at 10:51, Freddy Villalba Arias wrote:
Mark, didn't mean to be pedantic... just wanted to prevent everybody
from going through all the (obvious / basic / simple) details and just
go to the important stuff. Neither am I an MVC guru.
In any case, thanx everybody 4 your help.
Regards,
Freddy.
-Mensaje original-
De: Mark Lowe [mailto:[EMAIL PROTECTED]
Enviado el: viernes, 26 de marzo de 2004 10:24
Para: Struts Users Mailing List
Asunto: Re: Handling Date objects in ActionForm gracefully
I think the way of going about converting is pretty open, either have
some conversion utils between the web tier and the model. I tend to do
it in the action and then when things get long or i need the code again
move it out into a util class or like you're saying make my model util
classes deal with strings (this makes a lot of sense as then other
front ends can be plugged on).
Talk of MVC aside (after all MVC is a broader issue than the particular
pattern that struts is based on) why piss about dealing with all sorts
of errors and exceptions being thrown in the place where its hardest to
deal with them?
You can and people do use different types for form beans, but I just
don't see the point. Date comes up often and lets face it dates are
more user friendly as dropdown menus rather than free text, so
getDay() , getMonth() and getYear() IMO are a simpler way of going
about things. Then have methods in you model that create a date based
on that, or have a util class in the web tier as you can deal with
validating the three values. Perhaps even have a date that's in you
form bean but is set and got (passed participle of get) via string
flavors day, month and year.
Not sure if this works but I think the idea is valid (corrections
welcome).
public class SomeForm extends ActionForm {
private Calendar aDate = Calender.instance();
public String getDay() {
int d = aDate.get(Calendar. DAY_OF_MONTH);
return Integer.toString(d);
}
public void setDay(String day) {
aDate.set(Calendar.DAY_OF_MONTH,Integer.parseInt(day));
}
...
protected Date getAdate() {
return dDate.getTime();
}
}
This way come checking and comparing values before can be done, before
passing anything up to you model. Many folk would say that this should
be done in the model, but i'd say situations where you need to check if
a user has entered a valid date (e.g. expire and from dates with a
credit card).
This functionality will want to be produced even if you change the
model , if you wanted to demo your web tier on its own (without a model
e.g acme ltd credit card form) and therefore doing it ONLY in the
model would be limited.
Very much IMO and I'm not MVC guru, but that's my understanding.
On 26 Mar 2004, at 09:43, Freddy Villalba Arias wrote:
As someone with good experience in MVC-based applications but a newbie
to Struts, what I understand from this discussion is that the
recommended implementation would have to comply, at least, with this
guidelines:
- The conversion code is encapsulated in a separate class (I suppose
one
converter class per each String, Target Data Type combination
required, right?).
- Passes all (String) parameters to a Business Object that
encapsulates
the use case (I mean, the logic) and, from within that BO, use the
corresponding converter classes for getting the actual data object
to
flow around (i.e. be eventually get-ed or set-ed from the DAOs/DTOs,
bla
bla bla...)
I'm I right here or am I missing any other IMPORTANT aspect(s)?
STILL, there is something I don't get: how would you implement /
encapsulate then the opposite direction for data conversion; in other
words:
- Convert from original data types towards String (another method in
the same converter class?)
- Map (set) some (non-String) data object into the corresponding
String
property on the form bean.
Thanks,
Freddy.
-Mensaje original-
De: Mark Lowe [mailto:[EMAIL PROTECTED]
Enviado el: viernes, 26 de marzo de 2004 0:59
Para: Sreenivasa Chadalavada; Struts Users Mailing List
Asunto: Re: Handling Date objects in ActionForm gracefully
You deal with the conversion else where but not in the form bean, you
can argue about it or just believe me. The action form sits between
the
view and the action, the date conversion goes on between the action
and
the model.
Your approach isn't that bad its just not to the MVC pattern that
struts follows
RE: Handling Date objects in ActionForm gracefully
Cool!
No offence, Mark. In part, it's my fault since English is not my native
tongue and sometimes the same word translated into other language
changes the connotation of a phrase. Sh*t happens! :)
I believe yours is a valid approach (in fact, was one of the options I
was considering for the project we're about to begin). In any case, I'd
appreciate if you or anybody else would share any other views / opinions
about this issue (s) -- or any other related...
Peace, and thanx again everybody.
Freddy.
-Mensaje original-
De: Mark Lowe [mailto:[EMAIL PROTECTED]
Enviado el: viernes, 26 de marzo de 2004 11:05
Para: Struts Users Mailing List
Asunto: Re: Handling Date objects in ActionForm gracefully
Freddy. No, you misunderstood if you thought I was responding with any
hostility whatsoever.
There is a general problem where input would be better validated in the
web tier so it can be decoupled from the model. So times comparing two
dates would be useful and so on. But i think its also try to say that
using anything but strings for user input will lead to problems.
And my suggestion could well be incorrect, I was putting it out there
to see what response it would provoke.
Cheers Mark
On 26 Mar 2004, at 10:51, Freddy Villalba Arias wrote:
Mark, didn't mean to be pedantic... just wanted to prevent everybody
from going through all the (obvious / basic / simple) details and just
go to the important stuff. Neither am I an MVC guru.
In any case, thanx everybody 4 your help.
Regards,
Freddy.
-Mensaje original-
De: Mark Lowe [mailto:[EMAIL PROTECTED]
Enviado el: viernes, 26 de marzo de 2004 10:24
Para: Struts Users Mailing List
Asunto: Re: Handling Date objects in ActionForm gracefully
I think the way of going about converting is pretty open, either have
some conversion utils between the web tier and the model. I tend to do
it in the action and then when things get long or i need the code
again
move it out into a util class or like you're saying make my model
util
classes deal with strings (this makes a lot of sense as then other
front ends can be plugged on).
Talk of MVC aside (after all MVC is a broader issue than the
particular
pattern that struts is based on) why piss about dealing with all sorts
of errors and exceptions being thrown in the place where its hardest
to
deal with them?
You can and people do use different types for form beans, but I just
don't see the point. Date comes up often and lets face it dates are
more user friendly as dropdown menus rather than free text, so
getDay() , getMonth() and getYear() IMO are a simpler way of going
about things. Then have methods in you model that create a date based
on that, or have a util class in the web tier as you can deal with
validating the three values. Perhaps even have a date that's in you
form bean but is set and got (passed participle of get) via string
flavors day, month and year.
Not sure if this works but I think the idea is valid (corrections
welcome).
public class SomeForm extends ActionForm {
private Calendar aDate = Calender.instance();
public String getDay() {
int d = aDate.get(Calendar. DAY_OF_MONTH);
return Integer.toString(d);
}
public void setDay(String day) {
aDate.set(Calendar.DAY_OF_MONTH,Integer.parseInt(day));
}
...
protected Date getAdate() {
return dDate.getTime();
}
}
This way come checking and comparing values before can be done, before
passing anything up to you model. Many folk would say that this should
be done in the model, but i'd say situations where you need to check
if
a user has entered a valid date (e.g. expire and from dates with a
credit card).
This functionality will want to be produced even if you change the
model , if you wanted to demo your web tier on its own (without a
model
e.g acme ltd credit card form) and therefore doing it ONLY in the
model would be limited.
Very much IMO and I'm not MVC guru, but that's my understanding.
On 26 Mar 2004, at 09:43, Freddy Villalba Arias wrote:
As someone with good experience in MVC-based applications but a
newbie
to Struts, what I understand from this discussion is that the
recommended implementation would have to comply, at least, with
this
guidelines:
- The conversion code is encapsulated in a separate class (I suppose
one
converter class per each String, Target Data Type combination
required, right?).
- Passes all (String) parameters to a Business Object that
encapsulates
the use case (I mean, the logic) and, from within that BO, use the
corresponding converter classes for getting the actual data object
to
flow around (i.e. be eventually get-ed or set-ed from the DAOs/DTOs,
bla
bla bla...)
I'm I right here or am I missing any other IMPORTANT aspect(s)?
STILL, there is something I don't get: how would you implement /
encapsulate then the opposite
RE: Handling Date objects in ActionForm gracefully
What's the problem? robert -Original Message- From: Sreenivasa Chadalavada [mailto:[EMAIL PROTECTED] Sent: Thursday, March 25, 2004 2:28 PM To: Struts Users Mailing List Subject: Handling Date objects in ActionForm gracefully All, We are facing a problem when we define java.util.Date field in ActionForm. Is there any way to override the default behavior provided by Struts? I very much appreciate your help!! Thanks and Regards, Sree/- This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Handling Date objects in ActionForm gracefully
Have it as a string and convert it to a date or calendar when you pass it back to the model. On 25 Mar 2004, at 20:28, Sreenivasa Chadalavada wrote: All, We are facing a problem when we define java.util.Date field in ActionForm. Is there any way to override the default behavior provided by Struts? I very much appreciate your help!! Thanks and Regards, Sree/- --- - This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. --- - - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Handling Date objects in ActionForm gracefully
The date fields in jsp are not mandatory. So there will be null strings in the request/session. As I understand, Struts tries to create Date object out of the null string and chokes on it. I would like to know if my understanding is correct ? If this is true are there any solutions for the problem? Thanks and Regards, Sree/- This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. Robert Taylor rtaylor @mulework.com 03/25/2004 02:35 PM Please respond to Struts Users Mailing List To: Struts Users Mailing List [EMAIL PROTECTED] cc: Subject:RE: Handling Date objects in ActionForm gracefully What's the problem? robert -Original Message- From: Sreenivasa Chadalavada [mailto:[EMAIL PROTECTED] Sent: Thursday, March 25, 2004 2:28 PM To: Struts Users Mailing List Subject: Handling Date objects in ActionForm gracefully All, We are facing a problem when we define java.util.Date field in ActionForm. Is there any way to override the default behavior provided by Struts? I very much appreciate your help!! Thanks and Regards, Sree/- This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Handling Date objects in ActionForm gracefully
I am thinking of overriding the struts default mechanism. Override the default behavior of org.apache.commons.beanutils.ConvertUtils by registering a valid converter... I want to know if the above is possible.. Thanks and Regards, Sree/- This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. Mark Lowe mark.lowe @boxstuff.com 03/25/2004 02:36 PM Please respond to Struts Users Mailing List To: Struts Users Mailing List [EMAIL PROTECTED] cc: Subject:Re: Handling Date objects in ActionForm gracefully Have it as a string and convert it to a date or calendar when you pass it back to the model. On 25 Mar 2004, at 20:28, Sreenivasa Chadalavada wrote: All, We are facing a problem when we define java.util.Date field in ActionForm. Is there any way to override the default behavior provided by Struts? I very much appreciate your help!! Thanks and Regards, Sree/- --- - This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. --- - - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Handling Date objects in ActionForm gracefully
+1 -Original Message- From: Mark Lowe [mailto:[EMAIL PROTECTED] Sent: Thursday, March 25, 2004 2:36 PM To: Struts Users Mailing List Subject: Re: Handling Date objects in ActionForm gracefully Have it as a string and convert it to a date or calendar when you pass it back to the model. On 25 Mar 2004, at 20:28, Sreenivasa Chadalavada wrote: All, We are facing a problem when we define java.util.Date field in ActionForm. Is there any way to override the default behavior provided by Struts? I very much appreciate your help!! Thanks and Regards, Sree/- --- - This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. --- - - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Handling Date objects in ActionForm gracefully
yes it is. It should be done once per classloader. When struts populates the dyna form it is string array to string array conversion and uses populate method of BeanUtils which eventually calls the converters. sandeep -Original Message- From: Sreenivasa Chadalavada [mailto:[EMAIL PROTECTED] Sent: Thursday, March 25, 2004 2:47 PM To: Struts Users Mailing List Subject: Re: Handling Date objects in ActionForm gracefully I am thinking of overriding the struts default mechanism. Override the default behavior of org.apache.commons.beanutils.ConvertUtils by registering a valid converter... I want to know if the above is possible.. Thanks and Regards, Sree/- This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. Mark Lowe mark.lowe @boxstuff.com 03/25/2004 02:36 PM Please respond to Struts Users Mailing List To: Struts Users Mailing List [EMAIL PROTECTED] cc: Subject:Re: Handling Date objects in ActionForm gracefully Have it as a string and convert it to a date or calendar when you pass it back to the model. On 25 Mar 2004, at 20:28, Sreenivasa Chadalavada wrote: All, We are facing a problem when we define java.util.Date field in ActionForm. Is there any way to override the default behavior provided by Struts? I very much appreciate your help!! Thanks and Regards, Sree/- --- - This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. --- - - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Handling Date objects in ActionForm gracefully
Do you know if the behavior can be overridden? Thanks and Regards, Sree/- This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. Takhar, Sandeep Sandeep.Takhar @CIBC.ca 03/25/2004 02:53 PM Please respond to Struts Users Mailing List To: Struts Users Mailing List [EMAIL PROTECTED] cc: Subject:RE: Handling Date objects in ActionForm gracefully yes it is. It should be done once per classloader. When struts populates the dyna form it is string array to string array conversion and uses populate method of BeanUtils which eventually calls the converters. sandeep -Original Message- From: Sreenivasa Chadalavada [mailto:[EMAIL PROTECTED] Sent: Thursday, March 25, 2004 2:47 PM To: Struts Users Mailing List Subject: Re: Handling Date objects in ActionForm gracefully I am thinking of overriding the struts default mechanism. Override the default behavior of org.apache.commons.beanutils.ConvertUtils by registering a valid converter... I want to know if the above is possible.. Thanks and Regards, Sree/- This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. Mark Lowe mark.lowe @boxstuff.com 03/25/2004 02:36 PM Please respond to Struts Users Mailing List To: Struts Users Mailing List [EMAIL PROTECTED] cc: Subject:Re: Handling Date objects in ActionForm gracefully Have it as a string and convert it to a date or calendar when you pass it back to the model. On 25 Mar 2004, at 20:28, Sreenivasa Chadalavada wrote: All, We are facing a problem when we define java.util.Date field in ActionForm. Is there any way to override the default behavior provided by Struts? I very much appreciate your help!! Thanks and Regards, Sree/- --- - This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. --- - - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Handling Date objects in ActionForm gracefully
Ask yourself why are you trying to convert types for user input? On 25 Mar 2004, at 21:11, Sreenivasa Chadalavada wrote: Do you know if the behavior can be overridden? Thanks and Regards, Sree/- --- - This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. --- - Takhar, Sandeep Sandeep.Takhar @CIBC.ca 03/25/2004 02:53 PM Please respond to Struts Users Mailing List To: Struts Users Mailing List [EMAIL PROTECTED] cc: Subject:RE: Handling Date objects in ActionForm gracefully yes it is. It should be done once per classloader. When struts populates the dyna form it is string array to string array conversion and uses populate method of BeanUtils which eventually calls the converters. sandeep -Original Message- From: Sreenivasa Chadalavada [mailto:[EMAIL PROTECTED] Sent: Thursday, March 25, 2004 2:47 PM To: Struts Users Mailing List Subject: Re: Handling Date objects in ActionForm gracefully I am thinking of overriding the struts default mechanism. Override the default behavior of org.apache.commons.beanutils.ConvertUtils by registering a valid converter... I want to know if the above is possible.. Thanks and Regards, Sree/- --- - This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. --- - Mark Lowe mark.lowe @boxstuff.com 03/25/2004 02:36 PM Please respond to Struts Users Mailing List To: Struts Users Mailing List [EMAIL PROTECTED] cc: Subject:Re: Handling Date objects in ActionForm gracefully Have it as a string and convert it to a date or calendar when you pass it back to the model. On 25 Mar 2004, at 20:28, Sreenivasa Chadalavada wrote: All, We are facing a problem when we define java.util.Date field in ActionForm. Is there any way to override the default behavior provided by Struts? I very much appreciate your help!! Thanks and Regards, Sree/- -- - - This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. -- - - - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Handling Date objects in ActionForm gracefully
Define your own Form bean class which extends the DynaForm and then you can override the get/set methods In those methods you need to check if the type is Date then perform whatever operation you want Regards Anant -Original Message- From: Robert Taylor [mailto:[EMAIL PROTECTED] Sent: Friday, March 26, 2004 1:06 AM To: Struts Users Mailing List Subject: RE: Handling Date objects in ActionForm gracefully What's the problem? robert -Original Message- From: Sreenivasa Chadalavada [mailto:[EMAIL PROTECTED] Sent: Thursday, March 25, 2004 2:28 PM To: Struts Users Mailing List Subject: Handling Date objects in ActionForm gracefully All, We are facing a problem when we define java.util.Date field in ActionForm. Is there any way to override the default behavior provided by Struts? I very much appreciate your help!! Thanks and Regards, Sree/- -- -- This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Confidentiality Notice The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain confidential or privileged information. If you are not the intended recipient, please notify the sender at Wipro or [EMAIL PROTECTED] immediately and destroy all copies of this message and any attachments. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Handling Date objects in ActionForm gracefully
There are converters that can be used for overriding. For example BigDecimalConverter is a converter that handles any object going to a BigDecimal. you need to register the converters. Take a look at BeanUtils.deregister which is called in a static block at the beginning of BeanUtils. sandeep -Original Message- From: Sreenivasa Chadalavada [mailto:[EMAIL PROTECTED] Sent: Thursday, March 25, 2004 3:11 PM To: Struts Users Mailing List Subject: RE: Handling Date objects in ActionForm gracefully Do you know if the behavior can be overridden? Thanks and Regards, Sree/- This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. Takhar, Sandeep Sandeep.Takhar @CIBC.ca 03/25/2004 02:53 PM Please respond to Struts Users Mailing List To: Struts Users Mailing List [EMAIL PROTECTED] cc: Subject:RE: Handling Date objects in ActionForm gracefully yes it is. It should be done once per classloader. When struts populates the dyna form it is string array to string array conversion and uses populate method of BeanUtils which eventually calls the converters. sandeep -Original Message- From: Sreenivasa Chadalavada [mailto:[EMAIL PROTECTED] Sent: Thursday, March 25, 2004 2:47 PM To: Struts Users Mailing List Subject: Re: Handling Date objects in ActionForm gracefully I am thinking of overriding the struts default mechanism. Override the default behavior of org.apache.commons.beanutils.ConvertUtils by registering a valid converter... I want to know if the above is possible.. Thanks and Regards, Sree/- This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. Mark Lowe mark.lowe @boxstuff.com 03/25/2004 02:36 PM Please respond to Struts Users Mailing List To: Struts Users Mailing List [EMAIL PROTECTED] cc: Subject:Re: Handling Date objects in ActionForm gracefully Have it as a string and convert it to a date or calendar when you pass it back to the model. On 25 Mar 2004, at 20:28, Sreenivasa Chadalavada wrote: All, We are facing a problem when we define java.util.Date field in ActionForm. Is there any way to override the default behavior provided by Struts? I very much appreciate your help!! Thanks and Regards, Sree/- --- - This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. --- - - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Handling Date objects in ActionForm gracefully
You deal with the conversion else where but not in the form bean, you
can argue about it or just believe me. The action form sits between the
view and the action, the date conversion goes on between the action and
the model.
Your approach isn't that bad its just not to the MVC pattern that
struts follows (not that its the only one).
Create a date convertion util class or something.
If you dont want to take my word for it here's what craig had to say
albeit in response to a different question
snippet
As the original designer of Struts :-), I must point out that the
design of
ActionForm (and the recommendation that form bean properties be
Strings) is
***very*** deliberate. The reason this is needed is obvious when you
consider
the following use case:
* You have an input form that, say, accepts only integers.
* Your form bean property is of type int.
* The user types 1b3 instead of 123, by accident.
* Based on experience with any garden variety GUI application,
the user will expect that they receive an error message,
plus a redisplay of the form ***WITH THE INCORRECT VALUES
THAT WERE ENTERED DISPLAYED SO THE USER CAN CORRECT THEM***.
* The current Struts environment will throw an exception
due to the conversion failure.
* The suggested solution will ***hopelessly*** confuse the
nature of a form bean, which is part of the VIEW tier, with
model beans that have native data types.
Struts does not include any sort of user interface component model
where the
details of conversion are hidden inside the user interface component.
If that
is what you are after, you should look at a *real* user interface
component
model (such as using JavaServer Faces with a Struts application).
Corrupting
the functionality of a form bean to *pretend* that it is a user
interface
component is only going to create complications for the world.
/snippet
I hope this helps
Mark
On 25 Mar 2004, at 21:26, Sreenivasa Chadalavada wrote:
Application Tier is strongly typed.
So if the field is a java.util.Date in the database, then the data
object will have the method
public DataObject{
public java.util.Date getAsOfDate()
public void setAsOfDate(java.util.Date asOfDate) methods.
}
My Action form is:
public MyActionForm extends ActionForm{
public DataObject getDataObject();
public void setDataObject(DataObject dataObject);
}
My jsp contains
html:text property=dataObject.asOfDate/
This will fail if the user does not enter any date. I want the
(changed) struts framework to handle that.
I did not want to create a new method with type String for every Date
field
Hope this explanation helps !!
Thanks and Regards,
Sree/-
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Mark Lowe mark.lowe
@boxstuff.com
03/25/2004 03:17 PM
Please respond to Struts Users Mailing List
To: Struts Users Mailing List
[EMAIL PROTECTED]
cc:
Subject: Re: Handling Date objects in ActionForm
gracefully
Ask yourself why are you trying to convert types for user input?
On 25 Mar 2004, at 21:11, Sreenivasa Chadalavada wrote:
Do you know if the behavior can be overridden?
Thanks and Regards,
Sree/-
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delete without copying and kindly advise us by e-mail of the
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Takhar, Sandeep Sandeep.Takhar
@CIBC.ca
03/25/2004 02:53 PM
Please respond to Struts Users Mailing List
To: Struts Users Mailing List
[EMAIL PROTECTED]
cc:
Subject: RE: Handling Date objects in ActionForm
gracefully
yes it is. It should be done once per classloader.
When struts populates the dyna form it is string array to string
array
conversion and uses
populate method of BeanUtils which eventually calls the converters.
sandeep
-Original Message-
From: Sreenivasa Chadalavada [mailto:[EMAIL
