Examples of org.apache.wicket.util.iterator.ComponentHierarchyIterator

org.apache.wicket.util.iterator.ComponentHierarchyIterator
Iterator over the complete Component hierarchy. The implementation is parent first, meaning that first the parent gets returned upon next() and only than it's children.
A fluent or builder type of API is provided to configure the iterator with filters. @author Juergen Donnerstag @deprecated Hierarchy iterators are deprecated because they have problems with pages withdeep component tree. Use {@link org.apache.wicket.util.visit.IVisitor} instead. @see org.apache.wicket.MarkupContainer#visitChildren(org.apache.wicket.util.visit.IVisitor) @see org.apache.wicket.MarkupContainer#visitChildren(Class,org.apache.wicket.util.visit.IVisitor)

   * @return A iterator which iterators over all children and grand-children the Component,
   *         returning only components which implement (instanceof) the provided clazz.
   */
  public final ComponentHierarchyIterator visitChildren(final Class<?> clazz)
  {
    return new ComponentHierarchyIterator(this).filterByClass(clazz);
  }

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  /**
   * @return A iterator which iterators over all children and grand-children the Component
   */
  public final ComponentHierarchyIterator visitChildren()
  {
    return new ComponentHierarchyIterator(this);
  }

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   * @return A iterator which iterators over all children and grand-children the Component,
   *         returning only components which implement (instanceof) the provided clazz.
   */
  public final ComponentHierarchyIterator visitChildren(final Class<?> clazz)
  {
    return new ComponentHierarchyIterator(this).filterByClass(clazz);
  }

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  /**
   * @return A iterator which iterators over all children and grand-children the Component
   */
  public final ComponentHierarchyIterator visitChildren()
  {
    return new ComponentHierarchyIterator(this);
  }

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   * @return A iterator which iterators over all children and grand-children the Component,
   *         returning only components which implement (instanceof) the provided clazz.
   */
  public final ComponentHierarchyIterator visitChildren(final Class<?> clazz)
  {
    return new ComponentHierarchyIterator(this).filterByClass(clazz);
  }

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  /**
   * @return A iterator which iterators over all children and grand-children the Component
   */
  public final ComponentHierarchyIterator visitChildren()
  {
    return new ComponentHierarchyIterator(this);
  }

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   * @return A iterator which iterators over all children and grand-children the Component,
   *         returning only components which implement (instanceof) the provided clazz.
   */
  public final ComponentHierarchyIterator visitChildren(final Class<?> clazz)
  {
    return new ComponentHierarchyIterator(this).filterByClass(clazz);
  }

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  }


  @Override
  protected void onRender()
  {
    final ComponentHierarchyIterator visitChildren = getPage().visitChildren(
      FacebookRootProvider.class);
    if (!visitChildren.hasNext())
      throw new MissingFacebookRootException();


    if (findPage() != null)
    {
      AjaxRequestTarget target = getRequestCycle().find(AjaxRequestTarget.class);

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  /**
   * @param component
   */
  private void checkFacebookRoot(final Component component)
  {
    final ComponentHierarchyIterator visitChildren = component.getPage().visitChildren(
      FacebookRootProvider.class);
    if (!visitChildren.hasNext())
      throw new MissingFacebookRootException();
  }

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  /**
   * @return A iterator which iterators over all children and grand-children the Component
   */
  public final ComponentHierarchyIterator visitChildren()
  {
    return new ComponentHierarchyIterator(this);
  }

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