Examples of org.apache.wicket.model.IModel

org.apache.wicket.model.IModel
A IModel wraps the actual model Object used by a Component. IModel implementations are used as a facade for the real model so that users have control over the actual persistence strategy. Note that objects implementing this interface will be stored in the Session. Hence, you should use (non-transient) instance variables sparingly.
- Basic Models - To implement a basic (non-detachable) model which holds its entire state in the Session, you can either subclass {@link AbstractModel}, or use the simple model wrapper {@link Model}directly.
- Detachable Models - IModel inherits a hook, {@link IDetachable#detach()}, so that interface implementers can detach transient information when a model is no longer being actively used by the framework. This reduces memory use and reduces the expense of replicating the model in a clustered server environment. To implement a detachable model, you should generally extend {@link org.apache.wicket.model.AbstractDetachableModel}instead of implementing IModel directly.
- Property Models - The AbstractPropertyModel class provides default functionality for property models. A property model provides access to a particular property of its wrapped model.
- Compound Property Models - The IModel interface is parameterized by Component, allowing a model to be shared among several Components. When the {@link IModel#getObject()}method is called, the value returned will depend on the Component which is asking for the value. Likewise, the {@link IModel#setObject(Object)}method sets a different property depending on which Component is doing the setting. For more information on CompoundPropertyModels and model inheritance, see {@link org.apache.wicket.model.CompoundPropertyModel}and {@link org.apache.wicket.Page}.
@see org.apache.wicket.Component#sameInnermostModel(org.apache.wicket.Component) @see org.apache.wicket.Component#sameInnermostModel(IModel) @author Chris Turner @author Eelco Hillenius @author Jonathan LockeTODO 3.0: Vote on renaming get/setObject to get/setValue

      public Object next()
      {
        Object next = newModels.next();
        if (next != null && ! (next instanceof IModel))
          throw new WicketRuntimeException("Expecting an instance of " + IModel.class.getName() + ", got " + next.getClass().getName());
        final IModel model = (IModel)next;


        Item item = factory.newItem(index, model);
        index++;


        return item;

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        return newModels.hasNext();
      }


      public Object next()
      {
        final IModel model = (IModel)newModels.next();
        final Item oldItem = (Item)modelToItem.get(model);


        final Item item;
        if (oldItem == null)
        {

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      for (int i = 0; i < formComponents.length; i++)
      {
        final FormComponent formComponent = formComponents[i];


        String arg = "label" + i;
        IModel label = formComponent.getLabel();
        if (label != null)
        {
          args.put(arg, label.getObject());
        }
        else
        {
          args.put(arg, formComponent.getLocalizer().getString(formComponent.getId(),
              formComponent.getParent(), formComponent.getId()));

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    // Save component
    this.component = component;


    // Get component model
    final IModel model = component.getModel();


    // If the component has a model, it's about to change!
    if (model != null)
    {
      // Should we clone the model?
      boolean cloneModel = true;


      // If the component is a form component
      if (model instanceof CompoundPropertyModel)
      {
        if (component instanceof FormComponent)
        {
          // and it's using the same model as the form
          if (((FormComponent)component).getForm().getModel() == model)
          {
            // we don't need to clone the model, because it will
            // be re-initialized using initModel()
            cloneModel = false;
          }
        }
        else
        {
          // If the component is using the same model as the page
          if (component.getPage().getModel() == model)
          {
            // we don't need to clone the model, because it will
            // be re-initialized using initModel()
            cloneModel = false;
          }
        }
      }


      // Clone model?
      if (cloneModel)
      {
        model.detach();
        originalModel = (IModel)Objects.cloneModel(model);
      }
      else
      {
        originalModel = model;

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     */
    protected void populateItem(final ListItem listItem)
    {
      final FeedbackMessage message = (FeedbackMessage)listItem.getModelObject();
      message.markRendered();
      final IModel replacementModel = new Model()
      {
        private static final long serialVersionUID = 1L;


        /**
         * Returns feedbackPanel + the message level, eg

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   * 
   * @return The backing model object
   */
  public final Object getModelObject()
  {
    final IModel model = getModel();
    if (model != null)
    {
      // Get model value for this component.
      return model.getObject();
    }
    else
    {
      return null;
    }

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   *         component's model.
   */
  public final boolean sameInnermostModel(final IModel model)
  {
    // Get the two models
    IModel thisModel = getModel();
    IModel thatModel = model;


    // If both models are non-null they could be the same
    if (thisModel != null && thatModel != null)
    {
      return getInnermostModel(thisModel) == getInnermostModel(thatModel);

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    if (this.model != null)
    {
      this.model.detach();
    }


    IModel prevModel = this.model;
    if (prevModel instanceof IWrapModel)
    {
      prevModel = ((IWrapModel)prevModel).getWrappedModel();
    }

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   *            The object to set
   * @return This
   */
  public final Component setModelObject(final Object object)
  {
    final IModel model = getModel();


    // Check whether anything can be set at all
    if (model == null)
    {
      throw new IllegalStateException(
          "Attempt to set model object on null model of component: "
              + getPageRelativePath());
    }


    // Check authorization
    if (!isActionAuthorized(ENABLE))
    {
      throw new UnauthorizedActionException(this, ENABLE);
    }


    // Check whether this will result in an actual change
    if (!getModelComparator().compare(this, object))
    {
      modelChanging();
      model.setObject(object);
      modelChanged();
    }


    return this;
  }

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   *            The model
   * @return The innermost (most nested) model
   */
  protected final IModel getInnermostModel(final IModel model)
  {
    IModel nested = model;
    while (nested != null && nested instanceof IWrapModel)
    {
      final IModel next = ((IWrapModel)nested).getWrappedModel();
      if (nested == next)
      {
        throw new WicketRuntimeException("Model for " + nested + " is self-referential");
      }
      nested = next;

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