CompositeComponentRenderer.java

/*
 * Licensed 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 com.asual.summer.core.faces;

import java.io.IOException;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

import com.asual.summer.core.util.StringUtils;
import com.sun.faces.facelets.compiler.UIInstructions;

/**
 * 
 * @author Rostislav Hristov
 *
 */
public class CompositeComponentRenderer extends Renderer {

	public void encodeBegin(FacesContext context, UIComponent component) throws IOException {
		
		if (!ComponentUtils.isComponentWrapper(component)) {
			
			String componentTag = ComponentUtils.getComponentTag(component);
			ResponseWriter writer = context.getResponseWriter();
			writer.startElement(componentTag == null ? "div" : componentTag, component);
			
			Map<String, Object> attrs;
			
			if (ComponentUtils.getComponentClass((Component) component) == null) {
				attrs = ComponentUtils.getAttributes((Component) component, componentTag);
			} else {
				attrs = new HashMap<String, Object>();
			}
			
			List<String> classes = ComponentUtils.getComponentClasses((Component) component);
			if (classes.size() != 0) {
				attrs.put("class", StringUtils.join(classes, " "));
			}
			
			for (String key : attrs.keySet()) {
				Object value = attrs.get(key);
				if (ComponentUtils.shouldWriteAttribute((Component) component, key) && (value != null) && (!(value instanceof Collection) || (!((Collection<?>) value).isEmpty()))) {
					ComponentUtils.writeAttribute(writer, key, attrs.get(key));
				}
			}
		}
	}
	
	public void encodeChildren(FacesContext context, UIComponent component) throws IOException {

		Map<String,UIComponent> facets = component.getFacets();
		UIComponent compositeRoot = facets.get(UIComponent.COMPOSITE_FACET_NAME);
		if (null == compositeRoot) {
			throw new IOException("Unable to find element [" + component.getClientId() + "].");
		}
		
		String escape = ComponentUtils.getAttrValue((Component) component, "dataEscape");
		
		UIComponent facet = component.getFacet(UIComponent.COMPOSITE_FACET_NAME);
		if (!StringUtils.isEmpty(escape) && !Boolean.valueOf(escape) &&
				component.getFacetCount() == 1 && facet != null && facet instanceof UIPanel && 
				facet.getChildCount() == 1 && facet.getChildren().get(0) instanceof UIInstructions) {
			context.getResponseWriter().write(ComponentUtils.getValue(facet));
		} else {
			compositeRoot.encodeAll(context);
		}
	}
	
	public void encodeEnd(FacesContext context, UIComponent component)
		  throws IOException {
		
		ResponseWriter writer = context.getResponseWriter();
		if (!ComponentUtils.isComponentWrapper(component)) {
			String componentTag = ComponentUtils.getComponentTag(component);
			writer.endElement(componentTag == null ? "div" : componentTag);
		}
	}
	
	public void beginElement(Component component, String name) throws IOException {
		
		ResponseWriter writer = FacesContext.getCurrentInstance().getResponseWriter();
		writer.startElement(name, (UIComponent) component);

		Map<String, Object> attrs = ComponentUtils.getAttributes(component, name);
		if (ComponentUtils.isComponentWrapper((UIComponent) component)) {
			attrs.put("class", component.getStyleClass());
		}
		
		for (String key : attrs.keySet()) {
			if (ComponentUtils.shouldWriteAttribute(component, key) && attrs.get(key) != null) {
				ComponentUtils.writeAttribute(writer, key, attrs.get(key));
			}
		}
	}
	
	public void endElement(CompositeComponent component, String name) throws IOException {
		ResponseWriter writer = FacesContext.getCurrentInstance().getResponseWriter();
		writer.endElement(name);
	}

	public boolean getRendersChildren() {
		return true;
	}

}