/*
* Copyright 2009-2014 PrimeTek.
*
* 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 org.primefaces.renderkit;
import java.io.IOException;
import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.application.Resource;
import javax.faces.component.UIComponent;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.render.Renderer;
import org.primefaces.config.ConfigContainer;
import org.primefaces.context.RequestContext;
/**
* Renders head content based on the following order
* - First Facet
* - Theme CSS
* - Registered Resources
* - Head Content
* - Last Facet
*/
public class HeadRenderer extends Renderer {
@Override
public void encodeBegin(FacesContext context, UIComponent component) throws IOException {
ResponseWriter writer = context.getResponseWriter();
ConfigContainer cc = RequestContext.getCurrentInstance().getApplicationContext().getConfig();
writer.startElement("head", component);
//First facet
UIComponent first = component.getFacet("first");
if(first != null) {
first.encodeAll(context);
}
//Theme
String theme;
String themeParamValue = RequestContext.getCurrentInstance().getApplicationContext().getConfig().getTheme();
if(themeParamValue != null) {
ELContext elContext = context.getELContext();
ExpressionFactory expressionFactory = context.getApplication().getExpressionFactory();
ValueExpression ve = expressionFactory.createValueExpression(elContext, themeParamValue, String.class);
theme = (String) ve.getValue(elContext);
}
else {
theme = "aristo"; //default
}
if(theme != null && !theme.equals("none")) {
encodeCSS(context, "primefaces-" + theme, "theme.css");
}
//Middle facet
UIComponent middle = component.getFacet("middle");
if(middle != null) {
middle.encodeAll(context);
}
//Registered Resources
UIViewRoot viewRoot = context.getViewRoot();
for (UIComponent resource : viewRoot.getComponentResources(context, "head")) {
resource.encodeAll(context);
}
if(cc.isClientSideValidationEnabled()) {
encodeValidationResources(context, cc.isBeanValidationAvailable());
writer.startElement("script", null);
writer.writeAttribute("type", "text/javascript", null);
writer.write("PrimeFaces.settings.locale = '" + context.getViewRoot().getLocale() + "';");
writer.write("PrimeFaces.settings.validateEmptyFields = " + cc.isValidateEmptyFields() + ";");
writer.write("PrimeFaces.settings.considerEmptyStringNull = " + cc.isInterpretEmptyStringAsNull() + ";");
writer.endElement("script");
}
if(cc.isLegacyWidgetNamespace()) {
writer.startElement("script", null);
writer.writeAttribute("type", "text/javascript", null);
writer.write("PrimeFaces.settings.legacyWidgetNamespace = true;");
writer.endElement("script");
}
}
@Override
public void encodeEnd(FacesContext context, UIComponent component) throws IOException {
ResponseWriter writer = context.getResponseWriter();
//Last facet
UIComponent last = component.getFacet("last");
if(last != null) {
last.encodeAll(context);
}
writer.endElement("head");
}
protected void encodeCSS(FacesContext context, String library, String resource) throws IOException {
ResponseWriter writer = context.getResponseWriter();
Resource cssResource = context.getApplication().getResourceHandler().createResource(resource, library);
if (cssResource == null) {
throw new FacesException("Error loading css, cannot find \"" + resource + "\" resource of \"" + library + "\" library");
}
else {
writer.startElement("link", null);
writer.writeAttribute("type", "text/css", null);
writer.writeAttribute("rel", "stylesheet", null);
writer.writeAttribute("href", cssResource.getRequestPath(), null);
writer.endElement("link");
}
}
protected void encodeValidationResources(FacesContext context, boolean beanValidationEnabled) throws IOException {
ResponseWriter writer = context.getResponseWriter();
Resource resource = context.getApplication().getResourceHandler().createResource("validation/validation.js", "primefaces");
if(resource != null) {
writer.startElement("script", null);
writer.writeAttribute("type", "text/javascript", null);
writer.writeAttribute("src", resource.getRequestPath(), null);
writer.endElement("script");
}
if(beanValidationEnabled) {
resource = context.getApplication().getResourceHandler().createResource("validation/beanvalidation.js", "primefaces");
if(resource != null) {
writer.startElement("script", null);
writer.writeAttribute("type", "text/javascript", null);
writer.writeAttribute("src", resource.getRequestPath(), null);
writer.endElement("script");
}
}
}
}