org.apache.wicket.markup.resolver.WicketContainerResolver Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of org.ops4j.pax.wicket.service Show documentation

Pax Wicket Service is an OSGi extension of the Wicket framework, allowing for dynamic loading and unloading of Wicket components and pageSources.

There is a newer version: 5.0.0

Show newest version

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.wicket.markup.resolver;

import org.apache.wicket.Component;
import org.apache.wicket.MarkupContainer;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.MarkupStream;
import org.apache.wicket.markup.WicketTag;
import org.apache.wicket.markup.parser.filter.WicketTagIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * This is a tag resolver which handles <wicket:container>
 * 
 * Sometimes adding components in certain ways may lead to output of invalid markup. For example,
 * lets pretend we output table rows two at a time using a repeater. The markup would look something
 * like this:
 * 
 * 
 * 	
 * 		
 * 			
 * 			
 * 		
 * 	...
...
 * 
 * 
 * Notice that we had to attach the repeater to a component tag - in this case a span,
 * but a span is not a legal tag to nest under table. So we can rewrite the example as
 * following:
 * 
 * 
 * 	
 * 		
 * 			
 * 			
 * 		
 * 	...
...
 * 
 * 
 * The above is valid markup because wicket namespaced tags are allowed anywhere
 * 
 * @author Igor Vaynberg (ivaynberg)
 */
public class WicketContainerResolver implements IComponentResolver
{
	private static final Logger log = LoggerFactory.getLogger(WicketContainerResolver.class);

	private static final long serialVersionUID = 1L;

	/** */
	public static final String CONTAINER = "container";

	static
	{
		// register "wicket:container"
		WicketTagIdentifier.registerWellKnownTagName(CONTAINER);
	}

	public Component resolve(final MarkupContainer container, final MarkupStream markupStream,
		final ComponentTag tag)
	{
		if (tag instanceof WicketTag)
		{
			return container.get(tag.getId());
		}
		return null;
	}
}