Apple WebObjects 3.5 - Manual (Page 115)

Updating Objects in the Detail Display Group
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Talent browser, the selection should refer to a single object.
Consequently, you need to add two methods to manage the browser’s
selection: one to return a vector containing the selected Talent and one
to set the selected Talent from a vector object.
4. Add the method talentSelection to the MovieDetails.java class as follows:
public ImmutableVector talentSelection () {
EnterpriseObject aTalent;
EnterpriseObject aMovieRole =
(EnterpriseObject)movieRoleDisplayGroup.selectedObject();
if (aMovieRole == null) {
return null;
}
aTalent = (EnterpriseObject)aMovieRole.valueForKey("talent");
if (aTalent == null) {
return null;
} else {
EnterpriseObject talentArray[] = {aTalent};
return new ImmutableVector(talentArray);
}
}
Because the browser expects a vector for its selections attribute, this
method packages the selected MovieRole’s talent object in a vector. If
the selected MovieRole object is null , talentSelection simply returns null to
indicate that the browser shouldn’t set a selection.
5. Add the method setTalentSelection as follows:
public void setTalentSelection(ImmutableVector talentVector) {
if (talentVector.size() > 0) {
EnterpriseObject aMovieRole =
(EnterpriseObject)movieRoleDisplayGroup.selectedObject();
EnterpriseObject selectedTalent =
(EnterpriseObject)talentVector.firstElement();
aMovieRole.addObjectToBothSidesOfRelationshipWithKey(
selectedTalent,
"talent"
);
}
}