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Ajax4jsf is an open source extension to the JavaServer Faces standard that adds AJAX capability to JSF applications without requiring the writing of any JavaScript.
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/**
 * Licensed under the Common Development and Distribution License,
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.sun.com/cddl/
 *   
 * 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.ajax4jsf.framework.renderer.compiler;

import java.io.IOException;
import java.util.Iterator;

import javax.faces.FacesException;

import org.ajax4jsf.framework.util.message.Messages;
import org.xml.sax.SAXException;

/**
 * @author [email protected] (latest modification by $Author: alexsmirnov $)
 * @version $Revision: 1.4 $ $Date: 2006/09/04 14:07:03 $
 * 
 */
public class ClassElement extends ElementBase {

	private String _name;

	private static final String[] url = { "url(", ")" };

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.ajax4jsf.framework.renderer.compiler.ElementBase#encode(org.ajax4jsf.framework.renderer.compiler.TemplateContext,
	 *      java.lang.String)
	 */
	public void encode(TemplateContext context, String breakPoint)
			throws IOException {
		encode(context);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.ajax4jsf.framework.renderer.compiler.ElementBase#encode(org.ajax4jsf.framework.renderer.compiler.TemplateContext)
	 */
	public void encode(TemplateContext context) throws IOException {
		context.getWriter().writeText(getString(context), null);
	}

	/**
	 * @return Returns the name.
	 */
	public String getName() {
		return _name;
	}

	/**
	 * @param name
	 *            The name to set.
	 */
	public void setName(String name) {
		_name = name;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.ajax4jsf.framework.renderer.compiler.ElementBase#getString(org.ajax4jsf.framework.renderer.compiler.TemplateContext)
	 */
	public String getString(TemplateContext context) throws FacesException {
		if (null == getName()) {
			throw new FacesException(Messages
					.getMessage(Messages.STYLE_ATTRIBUTE_ERROR));
		}
		String stringOrDefault = valueGetter.getStringOrDefault(context);
		StringBuffer string = new StringBuffer();
		string.append(stringOrDefault);
		for (Iterator iter = getChildren().iterator(); iter.hasNext();) {
			Object element = iter.next();
			if (element instanceof ElementBase) {
				ElementBase stringElement = (ElementBase) element;
				String str = stringElement.getString(context);
				if (str.length() > 0) {
					string.append(" ");
					boolean isUrl = element instanceof ResourceElement;
					if (isUrl) {
						string.append(url[0]);
					}
					string.append(str);
					if (isUrl) {
						string.append(url[1]);
					}
				}
			}
		}
		if (string.length() > 0) {
			string.insert(0, ":").insert(0, getName()).append(";");
			return string.toString();
		} else {
			return "";
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.ajax4jsf.framework.renderer.compiler.PreparedTemplate#getTag()
	 */
	public String getTag() {
		// TODO Auto-generated method stub
		return HtmlCompiler.NS_PREFIX + HtmlCompiler.STYLE_TAG;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.ajax4jsf.framework.renderer.compiler.ElementBase#setParent(org.ajax4jsf.framework.renderer.compiler.PreparedTemplate)
	 */
	public void setParent(PreparedTemplate parent) throws SAXException {
		super.setParent(parent);
		if (getName() == null) {
			throw new SAXException(Messages.getMessage(
					Messages.NO_NAME_ATTRIBUTE_ERROR, getTag()));
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.ajax4jsf.framework.renderer.compiler.ElementBase#getAllowedClasses()
	 */
	protected Class[] getAllowedClasses() {
		// TODO Auto-generated method stub
		return new Class[] { MethodCallElement.class, TextElement.class,
				ResourceElement.class };
	}

}