Wicket Next (1.4/1.5)

Wicket NEXT Johan Compagner

Who is Johan Compagner
Senior Java Developer at Servoy
10+ years of Java experience
Swing and the Web (Struts/Tapestry)
Core Wicket developer since September 2004

Agenda
Wicket 1.4 (GENERICS!!)
Wicket 1.5 (or 2.0)
Q&A

Wicket 1.4
Generics
Model<T>
Component<T>
MetaData<T>

Model<T>
class IModel<T> {
T getObject()
void setObject(T)
}
Model<String> model = new Model<String>(“Wicket”);
String str = model.getObject(); // no cast.

Component<T>
Why the need to generify Component?
IModel parameter in constructor.
public Component(String id, IModel<T> model)
set/getModel() methods
public Component<T> setModel(IModel<T> model)
public final IModel<T> getModel()
getModelObject()
public final T getModelObject()

Component<T>
TextField<Double> tf = new TextField<Double>(“txt”,Double.class)
Double.class still needed for converter..
Also makes it more clear what components really want like ListView:
ListView<T> extends AbstractRepeater<List<T>>
public ListView(String id, IModel<List<T>> model)
And my personal favorite:
public DropDownChoice(String id,IModel<T> model,
IModel<List<T>> choices, IChoiceRenderer<T> renderer)
public ListMultipleChoice(String id, IModel<Collection<T>> model,
IModel<List<T>> choices,
IChoiceRenderer<T> renderer)

Wicket 1.4 what more..
A little bit more generics here and there
MetaData without generics:
MetaDataKey PERMISSION = new MetaDataKey(Permission. class );
Permission p = (Permission)session.getMetaData(PERMISSION);
With generics:
MetaDataKey<Permission> PERMISSIONS = new MetaDataKey<Permission>();
Permission p = session.getMetaData(PERMISSION);
Varargs..
MarkupContainer.add(Component... childs)
Component.add(IBehavior... behavior)
Some API breakage compared to 1.3 to fix some bugs and cleanup some API.
So no drop in replacement!

Wicket 1.4, WHEN!?!
NOW!!! (or almost, start commit now!)
At least in svn (trunk)
Or snapshot release (if bambo works out)
Not a release yet in a few weeks first milestone build.

Wicket 1.5/2.0
Don't hold me responsible if some of the next mentioned features don't make it!

Inheritance Improvement
Multiply extend/child area's
<html><body>
This is in the super markup.<wicket:child />This is in the super markup.
</body></html>
<html><body>
This is in the child markup.
<wicket:extend>This is in the child markup.</wicket:extend>
</body></html>
<html><body>
This is in the super markup.
This is in the super markup.
</body></html>

<html><body>
This is in the super markup.<wicket:child name=”child1”/>
This is in the super markup.<wicket:child name=”child2”/>
</body></html>
<html><body>
<wicket:extend name=”child1”>This is in the child1 markup.</wicket:extend>
<wicket:extend name=”child2”>This is in the child2 markup.</wicket:extend>
</body></html>
<html><body>
This is in the super markup. This is in the child1 markup.
This is in the super markup. This is in the child2 markup.
</body></html>

Childs can come from different sub pages.
Can have multiply childs itself again.

ProxyModel
A Model based on invocation recording.
Generates string expressions for the existing PropertyModel
SafePropertyModel<Person> p = new SafePropertyModel<Person>(new Person());
TextField field = new TextField("name", p.bind(p.toProperty().getFirstName()));

ProxyModel
Generates byte code that is a Macro
SafePropertyModel<Person> p = new SafePropertyModel<Person>(new Person());
TextField field = new TextField("name", p.bind(p.toProperty().getAddress().getCity()));
class Macro implements IPropertyInvoker {
void setObject(Object rootObject, Object value) {
Address address = ((Person)rootObject).getAddress();
if (address != null) address.setCity((City)value);
}
Object getObject(Object rootObject) {
Address address = ((Person)rootObject).getAddress();
if (address != null) return address.getCity();
return null; }
Almost no state to keep, the state is a class that is shared
Build on top of commons-proxy (and needs proxy/codegen classes)
Most likely not in core but in a separate project.

Validators/Behaviors
Validator should also be able to contribute to the markup.
Class MyLengthValidator implements IContributeBehaviorValidator
{
void validate(IValidatable validatable) {
String str = validatable.getValue();
if (str.length() > length) error();
}
IBehavior getBehavior() {
return SimpleAttributeModifier(“maxlength”,length);
}
}

Wicket 1.5/2.0
Window support (PageMap replacement)
A sub session for every tab in a browser.
More URL improvements
So that it becomes easier to use any URL encoding for everything (stateless forms etc)
CompoundAjaxBehavior
More then 1 action under 1 event.
Development Mode dashboard widget
Combination of InspectorBug and AjaxDebug
Resource/IResourceStream cleanup

Wicket Testing
WicketTester improved or replaced completely.
JDave/Hamcrest style testing

Wicket Security
Swarm/Wasp moved to Apache

Q/A
Do you guys want even more?

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Wicket Next (1.4/1.5)

by jcompagner

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