On 30-Mar-08, at 10:44 PM, Chris Meyer wrote:
One pattern I find myself using often is that I have a page listing
my objects (PeopleList) and a detail page (PersonDetail).
In my PeopleList component, I have a WORepetition of WOHyperlink's
linking to specific PersonDetails.
To facilitate the hyperlink, I have an action in PeopleList.java
that creates a new PeopleDetail page and sets the iterated Person in
the WORepetition into a variable on that new page.
My questions:
Is this the right design pattern to use?
If so, is there any way to use ognl or some other mechanism to avoid
writing the action method in PeopleList.java that loads the new page
and sets the Person variable on the new page?
If not, is there any fundamental reason why this cannot be done
automatically (with some syntax modifications/improvements in the
WOParser, or whatever)?
<cough>DirectToWeb</cough>
Failing that, create some superclasses for you components to inherit
from that contain the generic behaviour you want:
ListPage.java
public EOEnterpriseObject listItem;
public String detailsPageName; // set in your subclass;
...
public WOComponent goToDetailsPage() {
WOComponent nextPage = pageWithName(detailsPageName);
nextPage.takeValueForKey(listItem, "detailItem");
return nextPage;
}
DetailsPage.java
private EOEnterpriseObject _detailItem;
private WOComponent _backPage;
public DetailsPage(WOContext context) {
super(context);
setBackPage(this.context().page());
}
public EOEnterpriseObject detailItemt() {
return _detailsItem;
}
public void setDetailItem(EOEnterpriseObject obj) {
_detailItem = obj;
}
public WOComponent backPage() {
return _backPage;
}
public void setBackPage(WOComponent page) {
_backPage = page;
}
public WOComponent saveChanges() {
WOComponent nextPage = backPage();
try {
detailItem.editingContext().saveChanges();
} catch (Exception e) {
// EXAMPLE ONLY :-)
nextPage = null;
}
return nextPage;
}
PeopleList.wo:
<ul>
<wo:WORepetition list="people" item="person">
<li><wo:WOHyperlink action="gotoPersonDetail"><wo:string
value="$person.name"/></wo:WOHyperlink></li>
</wo:WORepetition>
</ul>
PeopleList.java
class PeopleList
{
public Person person;
// can this be avoided?
public WOComponent gotoPersonDetail()
{
PersonDetail pd =
(PersonDetail)pageWithName(PersonDetail.class.getSimpleName());
pd.person = person;
return pd;
}
}
PersonDetail.java
class PersonDetail
{
public Person person;
}
Code comment: Ooo ick - using public ivars in your api! - wrap that
person with accessors!
;david
--
David LeBer
Codeferous Software
'co-def-er-ous' adj. Literally 'code-bearing'
site: http://codeferous.com
blog: http://davidleber.net
profile: http://www.linkedin.com/in/davidleber
--
Toronto Area Cocoa / WebObjects developers group:
http://tacow.org
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