How to use

getActive

method

in

org.apache.wicket.extensions.breadcrumb.IBreadCrumbModel

@Override
public IBreadCrumbParticipant getActive()
{
  return decorated.getActive();
}

/**
 * @see org.apache.wicket.extensions.breadcrumb.IBreadCrumbModel#getActive()
 */
public IBreadCrumbParticipant getActive()
{
  return decorated.getActive();
}

/**
 * Activates the provided participant, which typically has the effect of replacing this current
 * panel with the one provided - as the participant typically would be a {@link BreadCrumbPanel
 * bread crumb panel} - and updating the bread crumb model of this panel, pushing the bread
 * crumb for the given participant on top.
 * 
 * @param participant
 *            The participant to set as the active one
 */
public void activate(final IBreadCrumbParticipant participant)
{
  // get the currently active participant
  final IBreadCrumbParticipant active = breadCrumbModel.getActive();
  if (active == null)
  {
    throw new IllegalStateException("The model has no active bread crumb. Before using " +
      this + ", you have to have at least one bread crumb in the model");
  }
  // add back button support
  addStateChange();
  // set the bread crumb panel as the active one
  breadCrumbModel.setActive(participant);
}

final IBreadCrumbParticipant active = breadCrumbModel.getActive();
if (active == null)

/**
 * @see org.apache.wicket.markup.html.link.Link#onClick()
 */
@Override
public void onClick()
{
  // get the currently active particpant
  final IBreadCrumbParticipant active = breadCrumbModel.getActive();
  if (active == null)
  {
    throw new IllegalStateException("The model has no active bread crumb. Before using " +
      this + ", you have to have at least one bread crumb in the model");
  }
  // get the participant to set as active
  final IBreadCrumbParticipant participant = getParticipant(active.getComponent().getId());
  // add back button support
  addStateChange();
  // set the next participant as the active one
  breadCrumbModel.setActive(participant);
}

/**
 * Callback for the onClick event. If ajax failed and this event was generated via a normal link
 * the target argument will be null
 * 
 * @param target
 *            ajax target if this linked was invoked using ajax, null otherwise
 */
@Override
public void onClick(AjaxRequestTarget target) {
  // get the currently active particpant
  final IBreadCrumbParticipant active = breadCrumbModel.getActive();
  if (active == null) {
    throw new IllegalStateException("The model has no active bread crumb. Before using " + this
        + ", you have to have at least one bread crumb in the model");
  }
  // get the participant to set as active
  final IBreadCrumbParticipant participant = getParticipant(active.getComponent().getId());
  // add back button support
  addStateChange();
  // set the next participant as the active one
  breadCrumbModel.setActive(participant);
}

/**
 * @see org.apache.wicket.markup.html.link.Link#onClick()
 */
@Override
public void onClick()
{
  // get the currently active particpant
  final IBreadCrumbParticipant active = breadCrumbModel.getActive();
  if (active == null)
  {
    throw new IllegalStateException("The model has no active bread crumb. Before using " +
        this + ", you have to have at least one bread crumb in the model");
  }
  // get the participant to set as active
  final IBreadCrumbParticipant participant = getParticipant(active.getComponent().getId());
  // add back button support
  addStateChange(new Change()
  {
    private static final long serialVersionUID = 1L;
    @Override
    public void undo()
    {
      breadCrumbModel.setActive(active);
    }
  });
  // set the next participant as the active one
  breadCrumbModel.setActive(participant);
}