Wicket ExternalLink with Model<DTO>

ExternalLink.java

package org.horsed.gists.externallink;

import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.model.IModel;

/**
 * Imitation of an {@link org.apache.wicket.markup.html.link.ExternalLink} that provides the {@code href} attribute
 * through a callback.
 * <p/>
 * <strong>Note: </strong>This is actually just a {@link WebMarkupContainer} and therefore puts the {@code href}
 * attribute on any HTML tag (even it is not an anchor tag).
 * 
 * @author Martin Knopf
 * 
 */
public abstract class ExternalLink extends Panel {

  public ExternalLink(String id) {
		super(id);
	}

	public ExternalLink(String id, IModel<?> model) {
		super(id, model);
	}

	@Override
	protected void onComponentTag(ComponentTag tag) {
		super.onComponentTag(tag);

		tag.put("href", getHref());
	}

	/**
	 * Returns the value of the {@code href} attribute of this {@link Component}.
	 * 
	 * @return
	 */
	protected abstract String getHref();
}

LogoLink.java

package org.horsed.gists.externallink;

import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.model.IModel;

public class LogoLink extends ExternalLink {

  private final IModel<String> model;

	public LogoLink(String id, IModel<String> model) {
		super(id, model);
		this.model = model;
	}

	@Override
	protected void onInitialize() {
		super.onInitialize();
		add(new Label("text", model.getObject()));
	}

	@Override
	protected String getHref() {
		return "google.de";
	}

}