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

   * 
   * @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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   * @return True if the given component's model is the same as this 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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   *            The model
   * @return This
   */
  public Component setModel(final IModel model)
  {
    IModel prevModel = getModelImpl();
    // Detach current model
    if (prevModel != null)
    {
      prevModel.detach();
    }


    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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  /**
   * Detaches the model for this component if it is detachable.
   */
  protected void detachModel()
  {
    IModel model = getModelImpl();
    if (model != null)
    {
      model.detach();
    }
    // also detach the wrapped model of a component assigned wrap (not
    // inherited)
    if (model instanceof IWrapModel && !getFlag(FLAG_INHERITABLE_MODEL))
    {

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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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    {
      // Get model
      // Don't call the getModel() that could initialize many inbetween
      // completely useless models.
      // IModel model = current.getModel();
      IModel model = current.getModelImpl();


      if (model instanceof IWrapModel && !(model instanceof IComponentInheritedModel))
      {
        model = ((IWrapModel)model).getWrappedModel();
      }

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  /**
   * @see org.apache.wicket.Component#setModel(org.apache.wicket.model.IModel)
   */
  public Component setModel(final IModel model)
  {
    final IModel previous = getModelImpl();
    super.setModel(model);
    if (previous instanceof IComponentInheritedModel)
    {
      visitChildren(new IVisitor()
      {
        public Object component(Component component)
        {
          IModel compModel = component.getModel();
          if (compModel instanceof IWrapModel)
          {
            compModel = ((IWrapModel)compModel).getWrappedModel();
          }
          if (compModel == previous)

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  /**
   * @see org.apache.wicket.Component#setModel(org.apache.wicket.model.IModel)
   */
  public Component setModel(final IModel model)
  {
    final IModel previous = this.model;
    super.setModel(model);
    if (previous instanceof IComponentInheritedModel)
    {
      visitChildren(new IVisitor()
      {
        public Object component(Component component)
        {
          IModel compModel = component.getModel();
          if (compModel instanceof IWrapModel)
          {
            compModel = ((IWrapModel)compModel).getWrappedModel();
          }
          if (compModel == previous)

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          add(row);


          // we add our actual SelectOption component to the row
          Object value = it.next();
          String text = renderer.getDisplayValue(value);
          IModel model = renderer.getModel(value);
          row.add(new SimpleSelectOption("option", model, text));
        }
      }
    }
  }

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