Custom h:head renderer to enable facets

gistfile1.java

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.render.Renderer;

/**
 * Renders head content based on the following order: <br/>
 * Begin facet<br/>
 * Unknown resources (like richfaces specific .ecss, .rflib)<br/>
 * CSS resources (resources that end with .css)<br/>
 * Middle facet<br/>
 * JavaScript resources (resources that end with .js)<br/>
 * h:head content encoded by
 * {@link Renderer#encodeChildren(FacesContext, UIComponent)}<br/>
 * End facet<br/>
 * 
 * Usage - add the following in faces-config.xml:
 * 
 * <renderer>
 * 		<component-family>javax.faces.Output</component-family>
 * 		<renderer-type>javax.faces.Head</renderer-type>
 * 		<renderer-class>test.HeadRenderer</renderer-class>
 * </renderer>
 */
public class HeadRenderer extends Renderer {

	@Override
	public void encodeBegin(FacesContext context, UIComponent component)
			throws IOException {
		ResponseWriter writer = context.getResponseWriter();
		writer.startElement("head", component);

		// "begin" facet
		UIComponent beginFacet = component.getFacet("begin");
		if (beginFacet != null) {
			beginFacet.encodeAll(context);
		}

		// Split resources managed by JSF and encode them
		List<UIComponent> styles = new ArrayList<UIComponent>();
		List<UIComponent> scripts = new ArrayList<UIComponent>();
		List<UIComponent> others = new ArrayList<UIComponent>();

		for (UIComponent current : context.getViewRoot().getComponentResources(
				context, "head")) {
			String name = (String) current.getAttributes().get("name");

			if (name != null) {
				if (name.endsWith(".css")) {
					styles.add(current);
				} else if (name.endsWith(".js")) {
					scripts.add(current);
				} else {
					others.add(current);
				}
			}
		}

		// Non JavaScript or css sources
		for (UIComponent other : others) {
			other.encodeAll(context);
		}

		// Styles
		for (UIComponent style : styles) {
			style.encodeAll(context);
		}

		// "middle" facet
		UIComponent middle = component.getFacet("middle");
		if (middle != null) {
			middle.encodeAll(context);
		}

		// Scripts
		for (UIComponent script : scripts) {
			script.encodeAll(context);
		}
	}

	@Override
	public void encodeEnd(FacesContext context, UIComponent component)
			throws IOException {
		ResponseWriter writer = context.getResponseWriter();

		// "end" facet
		UIComponent endFacet = component.getFacet("end");
		if (endFacet != null) {
			endFacet.encodeAll(context);
		}

		writer.endElement("head");
	}
}