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

   * @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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   * @deprecated Use findMarkupStream() instead.
   */
  @Deprecated
  protected MarkupStream locateMarkupStream()
  {
    return new MarkupStream(getMarkup());
  }

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   * @param markup
   * @return null, if not found
   */
  private final IMarkupFragment findStartTag(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 (tagName.equalsIgnoreCase(wtag.getName()))
          {
            return stream.getMarkupFragment();
          }
        }


        stream.skipToMatchingCloseTag(tag);
      }


      stream.next();
    }


    return null;
  }

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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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    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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   *            message that will be used for exceptions
   */
  public final void renderAssociatedMarkup(final String openTagName, final String exceptionMessage)
  {
    // Get associated markup file for the Border or Panel component
    final MarkupStream associatedMarkupStream = new MarkupStream(getMarkup(null));


    // Get open tag in associated markup of border component
    MarkupElement elem = associatedMarkupStream.get();
    if ((elem instanceof ComponentTag) == false)
    {
      associatedMarkupStream.throwMarkupException("Expected the open tag. " +
        exceptionMessage);
    }


    // Check for required open tag name
    ComponentTag associatedMarkupOpenTag = (ComponentTag)elem;
    if (!(associatedMarkupOpenTag.isOpen() && (associatedMarkupOpenTag instanceof WicketTag)))
    {
      associatedMarkupStream.throwMarkupException(exceptionMessage);
    }


    try
    {
      setIgnoreAttributeModifier(true);
      renderComponentTag(associatedMarkupOpenTag);
      associatedMarkupStream.next();


      String className = null;


      final boolean outputClassName = getApplication().getDebugSettings()
        .isOutputMarkupContainerClassName();

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        markupStream.skipRawMarkup();
      }


      // Get the <span wicket:id="myBorder"> markup and render that instead
      IMarkupFragment markup = Border.this.getMarkup();
      MarkupStream stream = new MarkupStream(markup);
      ComponentTag tag = stream.getTag();
      stream.next();


      super.onComponentTagBody(stream, tag);
    }

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     */
    private IMarkupFragment findByName(final IMarkupFragment markup, final String name)
    {
      Args.notEmpty(name, "name");


      MarkupStream stream = new MarkupStream(markup);


      // Skip any raw markup
      stream.skipUntil(ComponentTag.class);


      // Skip <wicket:border>
      stream.next();


      while (stream.skipUntil(ComponentTag.class))
      {
        ComponentTag tag = stream.getTag();
        if (tag.isOpen() || tag.isOpenClose())
        {
          if (TagUtils.isWicketBodyTag(tag))
          {
            return stream.getMarkupFragment();
          }
        }


        stream.next();
      }


      return null;
    }

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  private static boolean compareMarkup(final String a, final String b)
  {
    try
    {
      // Parse a and b into markup and compare
      final MarkupStream amarkup = new MarkupStream(new MarkupParser(a).parse());
      final MarkupStream bmarkup = new MarkupStream(new MarkupParser(b).parse());
      return amarkup.equalTo(bmarkup);
    }
    catch (IOException e)
    {
      log.error(e.getMessage(), e);

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