org.apache.wicket.markup.repeater.RepeatingView Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of wicket-core Show documentation

Wicket is a Java web application framework that takes simplicity, separation of concerns and ease of development to a whole new level. Wicket pages can be mocked up, previewed and later revised using standard WYSIWYG HTML design tools. Dynamic content processing and form handling is all handled in Java code using a first-class component model backed by POJO data beans that can easily be persisted using your favorite technology.

There is a newer version: 10.0.0

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.repeater;

import java.util.Iterator;

import org.apache.wicket.Component;
import org.apache.wicket.model.IModel;


/**
 * 
 * A repeater view that renders all of its children, using its body markup, in the order they were
 * added.
 * 
 * 
 * Example:
 * 
 * Java:
 * 
 * 
 * RepeatingView view = new RepeatingView("repeater");
 * view.add(new Label(view.newChildId(), "hello"));
 * view.add(new Label(view.newChildId(), "goodbye"));
 * view.add(new Label(view.newChildId(), "good morning"));
 * add(view);
 * 
 * 
 * 
 * 
 * Markup:
 * 
 * 
 *  <ul><li wicket:id="repeater"></li></ul>
 * 
 * 
 * 
 * 
 * Yields:
 * 
 * 
 *  <ul><li>hello</li><li>goodbye</li><li>good morning</li></ul>
 * 
 * 
 * To expand a bit: the repeater itself produces no markup, instead every direct child inherits the
 * entire markup of the repeater. In the example above repeaters's markup is:
 * 
 *  *  <li wicket:id="repeater"></li>
 * 
 * 
 * and so this is the markup that is available to the direct children - the Label components. So as
 * each label renders it produces a line of the output that has the litag.
 * 
 * @author Igor Vaynberg ( ivaynberg )
 */
public class RepeatingView extends AbstractRepeater
{
	private static final long serialVersionUID = 1L;

	/** Counter used for generating unique child component ids. */
	private long childIdCounter = 0;

	/** @see Component#Component(String) */
	public RepeatingView(String id)
	{
		super(id);
	}

	/** @see Component#Component(String, IModel) */
	public RepeatingView(String id, IModel model)
	{
		super(id, model);
	}

	/**
	 * Generates a unique id string. This makes it easy to add items to be rendered w/out having to
	 * worry about generating unique id strings in your code.
	 * 
	 * @return unique child id
	 */
	public String newChildId()
	{
		childIdCounter++;
		return String.valueOf(childIdCounter).intern();
	}

	/**
	 * @see org.apache.wicket.markup.repeater.AbstractRepeater#renderIterator()
	 */
	@Override
	protected Iterator renderIterator()
	{
		return iterator();
	}

	/**
	 * @see org.apache.wicket.markup.repeater.AbstractRepeater#onPopulate()
	 */
	@Override
	protected void onPopulate()
	{
		// noop - population of this repeater is manual
	}
}