Examples of org.apache.wicket.markup.MarkupStream

org.apache.wicket.markup.MarkupStream
A stream of {@link org.apache.wicket.markup.MarkupElement}s, subclasses of which are {@link org.apache.wicket.markup.ComponentTag} and {@link org.apache.wicket.markup.RawMarkup}. A markup stream has a current index in the list of markup elements. The next markup element can be retrieved and the index advanced by calling next(). If the index hits the end, hasMore() will return false.
The current markup element can be accessed with get() and as a ComponentTag with getTag().
The stream can be sought to a particular location with setCurrentIndex().
Convenience methods also exist to skip component tags (and any potentially nested markup) or raw markup.
Several boolean methods of the form at*() return true if the markup stream is positioned at a tag with a given set of characteristics.
The resource from which the markup was loaded can be retrieved with getResource(). @author Jonathan Locke

   * render() does seem to work, it will fail for panel children.
   */
  public final void render()
  {
    // Allow currently invisible components to be re-rendered as well
    MarkupStream markupStream = null;
    if (getParent() != null)
    {
      markupStream = findMarkupStream();
    }

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    }
    else
    {
      // Save the parent's markup stream to re-assign it at the end
      MarkupContainer parent = getParent();
      MarkupStream originalMarkupStream = parent.getMarkupStream();
      MarkupStream markupStream = locateMarkupStream();


      try
      {
        // Make sure that while rendering the markup stream is found
        parent.setMarkupStream(markupStream);

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        // <wicket:head> components are handled differently. We can
        // not use the container, because it is the container the
        // header has been added to (e.g. the Page). What we need
        // however, is the component (e.g. a Panel) which
        // contributed it.
        MarkupStream markupStream = new MarkupStream(container.getMarkup());
        Class<? extends Component> clazz = markupStream.getContainerClass();


        // However if the markup stream is a merged markup stream (inheritance), than we
        // need the class of the markup file which contained the tag.
        if ((markupStream.get() instanceof ComponentTag) &&
          (markupStream.getTag().getMarkupClass() != null))
        {
          clazz = markupStream.getTag().getMarkupClass();
        }


        // Create the component implementing the link
        ResourceReferenceAutolink autoLink = new ResourceReferenceAutolink(autoId, clazz,
          pathInfo.reference, attribute, container);

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        if (container.getParent() != null)
        {
          parentWithContainer = container.findParentWithAssociatedMarkup();
        }
        if ((parentWithContainer instanceof Page) && !pathInfo.path.startsWith("/") &&
          new MarkupStream(page.getMarkup()).isMergedMarkup())
        {
          Class<? extends Page> clazz = (Class<? extends Page>)new MarkupStream(
            container.getMarkup()).getTag().getMarkupClass();
          if (clazz != null)
          {
            // Href is relative. Resolve the url given relative to
            // the current page

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      if ((parentMarkup != null) && (markup != parentMarkup))
      {
        // The component's markup must be in the same file as its parent
        if (markup.getMarkupResourceStream() == parentMarkup.getMarkupResourceStream())
        {
          MarkupStream stream = new MarkupStream(markup);
          stream.skipUntil(ComponentTag.class);
          ComponentTag openTag = stream.getTag();
          if (openTag != null)
          {
            MarkupStream parentStream = new MarkupStream(parentMarkup);
            if (parentStream.skipUntil(ComponentTag.class))
            {
              parentStream.next();
            }


            Stack<ComponentTag> stack = new Stack<ComponentTag>();
            while (parentStream.skipUntil(ComponentTag.class))
            {
              ComponentTag tag = parentStream.getTag();
              if (openTag == tag)
              {
                if (stack.isEmpty() == false)
                {
                  // This tag belong to the real parent
                  final ComponentTag lastTag = stack.pop();
                  parent.visitChildren(MarkupContainer.class,
                    new IVisitor<MarkupContainer, Void>()
                    {
                      public void component(final MarkupContainer component,
                        final IVisit<Void> visit)
                      {
                        IMarkupFragment m = component.getMarkup();
                        MarkupStream ms = new MarkupStream(m);
                        ms.skipUntil(ComponentTag.class);
                        if (ms.hasMore() && (lastTag == ms.getTag()))
                        {
                          component.add(Component.this);
                          visit.stop();
                        }
                      }

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    {
      throw new MarkupNotFoundException("Markup not found for Component: " + toString());
    }


    // MarkupStream is an Iterator for the markup
    MarkupStream markupStream = new MarkupStream(markup);


    // Flag: we stated the render process
    markRendering(true);


    MarkupElement elem = markup.get(0);

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    if (markup == null)
    {
      throw new MarkupException("Markup not found. Component: " + toString());
    }


    final MarkupStream markupStream = new MarkupStream(markup);


    // Get mutable copy of next tag
    final ComponentTag openTag = markupStream.getTag();
    final ComponentTag tag = openTag.mutable();


    // Call any tag handler
    onComponentTag(tag);


    // If we're an openclose tag
    if (!tag.isOpenClose() && !tag.isOpen())
    {
      // We were something other than <tag> or <tag/>
      markupStream.throwMarkupException("Method renderComponent called on bad markup element: " +
        tag);
    }


    if (tag.isOpenClose() && openTag.isOpen())
    {
      markupStream.throwMarkupException("You can not modify a open tag to open-close: " + tag);
    }


    try
    {
      // Render open tag
      if (getRenderBodyOnly() == false)
      {
        renderComponentTag(tag);
      }
      markupStream.next();


      // Render the body only if open-body-close. Do not render if open-close.
      if (tag.isOpen())
      {
        // Render the body. The default strategy will simply call the component's

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   *         we ask this component's parent to search for it.
   * @TODO can be removed in 1.5
   */
  protected final MarkupStream findMarkupStream()
  {
    return new MarkupStream(getMarkup());
  }

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  /**
   * @return Component's markup stream
   */
  protected MarkupStream locateMarkupStream()
  {
    return new MarkupStream(getMarkup());
  }

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    IMarkupFragment markup = getAssociatedMarkup();


    // If we found markup for this container
    if (markup != null)
    {
      return new MarkupStream(markup);
    }


    if (throwException == true)
    {
      // throw exception since there is no associated markup

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