Custom component with custom markup

gistfile1.java

package com.mycompany;

import org.apache.wicket.MarkupContainer;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.IMarkupCacheKeyProvider;
import org.apache.wicket.markup.IMarkupResourceStreamProvider;
import org.apache.wicket.markup.MarkupException;
import org.apache.wicket.markup.MarkupStream;
import org.apache.wicket.markup.html.WebMarkupContainerWithAssociatedMarkup;
import org.apache.wicket.util.resource.IResourceStream;
import org.apache.wicket.util.resource.StringResourceStream;

/**
 * WebMarkupContainerWithAssociatedMarkup with a custom template
 */
public class CustomTemplateComponent extends WebMarkupContainerWithAssociatedMarkup
	implements IMarkupResourceStreamProvider, IMarkupCacheKeyProvider {

	private static final long serialVersionUID = 1L;

	// use existing <wicket:xyz> that renders only its body => wicket:container
	private final static String WICKET_TAG_NAME = "container";
	
	public CustomTemplateComponent(String id) {
		super(id);
	}

	@Override
	protected void onComponentTagBody(final MarkupStream markupStream, final ComponentTag openTag)
	{
		// Use 
		renderAssociatedMarkup(WICKET_TAG_NAME,
			"Markup for a panel component has to contain part '<wicket:"+WICKET_TAG_NAME+">'");
		
		if (openTag.isOpenClose() == false)
		{
			// Skip any raw markup in the body
			markupStream.skipRawMarkup();
			if (markupStream.get().closes(openTag) == false)
			{
				throw new MarkupException(markupStream, "close tag not found for tag: " +
					openTag.toString() + ". Component: " + this.toString());
			}
		}
	}
	
	public String getCacheKey(MarkupContainer container, Class<?> containerClass) {
		// return 'null' to don't cache it
		return null;
	}

	public IResourceStream getMarkupResourceStream(MarkupContainer container,
			Class<?> containerClass) {
		
		return new StringResourceStream(getOpenTag()+"custom template"+getCloseTag());
	}

	private String getOpenTag() {
		return "<wicket:"+WICKET_TAG_NAME+">";
	}
	
	private String getCloseTag() {
		return "</wicket:"+WICKET_TAG_NAME+">";
	}
}