+1
Juergen
On 4/22/05, Eelco Hillenius <[EMAIL PROTECTED]> wrote:
> Hi,
>
> In project wicket-contrib-data, there is TransientObjectDetachableModel.
> I find this model very usefull, and think that this model (maybe with a
> different name?) should be in wicket-core or wicket-extensions as in my
> opinion the current way of making a custom detachable models is just too
> verbose.
>
> It handles the case where you want to load an object when onAttach is
> called, that object (transient) is returned on getObject, and onDetach,
> the object is set to null again. In my implementation, there is only one
> method to implement (load) opposed to the multiple methods when
> overriding AbstractDetachableModel.
>
> An example of it's usage:
>
> public final class HuidigeKlantModel extends TransientObjectDetachableModel
> {
> protected Object load()
> {
> FmoDemoSession session = (FmoDemoSession)WebSession.get();
> return session.getHuidigeKlant();
> }
> }
>
> And this is the implementation:
>
> import wicket.Component;
> import wicket.model.AbstractDetachableModel;
>
> /**
> * Model that makes working with detachable models a breeze again.
> * Holds a temporary, transient model object, that is set on 'onAttach'
> by calling
> * abstract method 'load', and that will be reset/ set to null on
> 'onDetach'.
> *
> * A usage example:
> * <pre>
> * TransientObjectDetachableModel venueListModel = new
> TransientObjectDetachableModel()
> * {
> * protected Object load()
> * {
> * return getVenueDao().findVenues();
> * }
> * };
> * </pre>
> *
> * @author Eelco Hillenius
> */
> public abstract class TransientObjectDetachableModel extends
> AbstractDetachableModel
> {
> /** temporary, transient object. */
> private transient Object tempModelObject;
>
> /**
> * Construct.
> */
> public TransientObjectDetachableModel()
> {
> super();
> }
>
> /**
> * @see wicket.model.AbstractDetachableModel#onAttach()
> */
> protected final void onAttach()
> {
> this.setObject(load());
> }
>
> /**
> * Loads and returns the (temporary) model object.
> * @return the (temporary) model object
> */
> protected abstract Object load();
>
> /**
> * @see wicket.model.AbstractDetachableModel#onDetach()
> */
> protected final void onDetach()
> {
> tempModelObject = null;
> }
>
> /**
> * @see
> wicket.model.AbstractDetachableModel#onGetObject(wicket.Component)
> */
> protected final Object onGetObject(Component component)
> {
> return tempModelObject;
> }
>
> /**
> * Sets the object.
> * @param object the object
> */
> protected final void setObject(Object object)
> {
> setObject(null, object);
> }
>
> /**
> * @see
> wicket.model.AbstractDetachableModel#onSetObject(wicket.Component,
> java.lang.Object)
> */
> protected final void onSetObject(Component component, Object object)
> {
> this.tempModelObject = object;
> }
>
> /**
> * @see wicket.model.IModel#getNestedModel()
> */
> public final Object getNestedModel()
> {
> return tempModelObject;
> }
> }
>
> Votes please?
>
> Eelco
>
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