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

    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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            .append(isVersioned());
        }


        if (markup != null)
        {
          buffer.append(", markup = ").append(new MarkupStream(getMarkup()).toString());
        }
      }


      buffer.append(']');

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   * @return The markup stream for this component. Since a Component cannot have a markup stream,
   *         we ask this component's parent to search for it.
   */
  protected final MarkupStream findMarkupStream()
  {
    return new MarkupStream(getMarkup());
  }

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    // Get the associated markup
    IMarkupFragment markup = container.getAssociatedMarkup();
    IMarkupFragment childMarkup = null;


    // MarkupStream is good at searching markup
    MarkupStream stream = new MarkupStream(markup);
    while (stream.skipUntil(ComponentTag.class) && (childMarkup == null))
    {
      ComponentTag tag = stream.getTag();
      if (TagUtils.isWicketHeadTag(tag))
      {
        if (tag.getMarkupClass() == null)
        {
          // find() can still fail an return null => continue the search
          childMarkup = stream.getMarkupFragment().find(child.getId());
        }
      }
      else if (TagUtils.isHeadTag(tag))
      {
        // find() can still fail an return null => continue the search
        childMarkup = stream.getMarkupFragment().find(child.getId());
      }


      // Must be a direct child. We are not interested in grand children
      if (tag.isOpen() && !tag.hasNoCloseTag())
      {
        stream.skipToMatchingCloseTag(tag);
      }
      stream.next();
    }


    return childMarkup;
  }

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    // reset for each render in case the strategy is re-used
    noMoreWicketHeadTagsAllowed = false;


    // Gracefully getAssociateMarkupStream. Throws no exception in case
    // markup is not found
    final MarkupStream markupStream = container.getAssociatedMarkupStream(false);
    if (markupStream == null)
    {
      return;
    }


    // Position pointer at current (first) header
    noMoreWicketHeadTagsAllowed = false;
    while (nextHeaderMarkup(markupStream) != -1)
    {
      // found <wicket:head>
      String headerId = getHeaderId(container, markupStream);


      // Create a HeaderPartContainer and associate the markup
      HeaderPartContainer headerPart = getHeaderPart(container, headerId,
        markupStream.getMarkupFragment());
      if (headerPart != null)
      {
        // A component's header section must only be added once,
        // no matter how often the same Component has been added
        // to the page or any other container in the hierarchy.
        if (htmlContainer.okToRenderComponent(headerPart.getScope(), headerPart.getId()))
        {
          // make sure the Page is accessible
          headerPart.setParent(htmlContainer);
          headerPart.render();
        }
      }


      // Position the stream after <wicket:head>
      markupStream.skipComponent();
    }
  }

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   * @param markup
   * @return null, if not found
   */
  private final static IMarkupFragment findPanelTag(final IMarkupFragment markup)
  {
    MarkupStream stream = new MarkupStream(markup);


    while (stream.skipUntil(ComponentTag.class))
    {
      ComponentTag tag = stream.getTag();
      if (tag.isOpen() || tag.isOpenClose())
      {
        if (tag instanceof WicketTag)
        {
          WicketTag wtag = (WicketTag)tag;
          if (wtag.isPanelTag())
          {
            return stream.getMarkupFragment();
          }
        }
        stream.skipToMatchingCloseTag(tag);
      }


      stream.next();
    }


    return null;
  }

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  private transient MarkupStream markupStream;


  @Override
  public void beforeRender(final Component component)
  {
    final MarkupStream stream = getMarkupStream(component);
    final Response response = component.getResponse();
    stream.setCurrentIndex(0);


    boolean insideBorderMarkup = false;
    while (stream.hasMore())
    {
      MarkupElement elem = stream.get();
      stream.next();
      if (elem instanceof WicketTag)
      {
        WicketTag wTag = (WicketTag)elem;
        if (!insideBorderMarkup)
        {
          if (wTag.isBorderTag() && wTag.isOpen())
          {
            insideBorderMarkup = true;
            continue;
          }
          else
          {
            throw new WicketRuntimeException(
              "Unexpected tag encountered in markup of component border " +
                getClass().getName() + ". Tag: " + wTag.toString() +
                ", expected tag: <wicket:border>");
          }
        }
        else
        {
          if (wTag.isBodyTag())
          {
            break;
          }
          else
          {
            throw new WicketRuntimeException(
              "Unexpected tag encountered in markup of component border " +
                getClass().getName() + ". Tag: " + wTag.toString() +
                ", expected tag: <wicket:body> or </wicket:body>");
          }
        }
      }
      if (insideBorderMarkup)
      {
        response.write(elem.toCharSequence());
      }
    }


    if (!stream.hasMore())
    {
      throw new WicketRuntimeException("Markup for component border " + getClass().getName() +
        " ended prematurely, was expecting </wicket:border>");
    }
  }

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  }


  @Override
  public void afterRender(final Component component)
  {
    final MarkupStream stream = getMarkupStream(component);
    final Response response = component.getResponse();


    while (stream.hasMore())
    {
      MarkupElement elem = stream.get();
      stream.next();
      if (elem instanceof WicketTag)
      {
        WicketTag wTag = (WicketTag)elem;
        if (wTag.isBorderTag() && wTag.isClose())
        {

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    {
      IMarkupFragment markup = MarkupFactory.get()
        .newMarkupParser(markupResourceStream)
        .parse();


      return new MarkupStream(markup);
    }
    catch (Exception e)
    {
      throw new WicketRuntimeException(
        "Could not parse markup from markup resource stream: " +

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    // clear the cache
    childComponent = null;


    // get Child Component. If not "added", ask a resolver to find it.
    childComponent = getChildComponent(new MarkupStream(getMarkup()), container);
    checkChildComponent(childComponent);
  }

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