/*
 * 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.html.basic;

import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.MarkupStream;
import org.apache.wicket.markup.html.WebComponent;
import org.apache.wicket.markup.parser.XmlTag.TagType;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;
import org.apache.wicket.util.string.Strings;

/**
 * A MultiLineLabel component replaces its body with the model object.
 * <p>
 * Unlike {@link Label}, {@link MultiLineLabel} shows text that spans multiple lines by inserting
 * line breaks (<code>BR</code> tags) for newlines and paragraph markers (<code>P</code> tags) for
 * sequences of more than one newline.
 * 
 * @author Jonathan Locke
 */
public class MultiLineLabel extends WebComponent
{
	private static final long serialVersionUID = 1L;

	/**
	 * Constructor. Same as Label(String).
	 * 
	 * @param id
	 *            See Component
	 * @see Label#Label(String)
	 */
	public MultiLineLabel(final String id)
	{
		super(id);
	}

	/**
	 * Convenience constructor. Same as MultiLineLabel(String, new Modell&lt;String&gt;(String))
	 * 
	 * @param id
	 *            See Component
	 * @param label
	 *            The label text
	 * 
	 * @see org.apache.wicket.Component#Component(String, IModel)
	 */
	public MultiLineLabel(final String id, String label)
	{
		this(id, new Model<String>(label));
	}

	/**
	 * @see org.apache.wicket.Component#Component(String, IModel)
	 */
	public MultiLineLabel(final String id, IModel<?> model)
	{
		super(id, model);
	}

	@Override
	public void onComponentTagBody(final MarkupStream markupStream, final ComponentTag openTag)
	{
		CharSequence body = Strings.toMultilineMarkup(getDefaultModelObjectAsString());
		replaceComponentTagBody(markupStream, openTag, body);
	}

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

		// always transform the tag to <span></span> so even labels defined as <span/> render
		tag.setType(TagType.OPEN);
	}
}
