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The advanced component library for ICEfaces.
There is a newer version: 4.3.0
/*
 * Original Code Copyright Prime Technology.
 * Subsequent Code Modifications Copyright 2011-2012 ICEsoft Technologies Canada Corp. (c)
 *
 * 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.
 *
 * NOTE THIS CODE HAS BEEN MODIFIED FROM ORIGINAL FORM
 *
 * Subsequent Code Modifications have been made and contributed by ICEsoft Technologies Canada Corp. (c).
 *
 * Code Modification 1: Integrated with ICEfaces Advanced Component Environment.
 * Contributors: ICEsoft Technologies Canada Corp. (c)
 *
 * Code Modification 2: [ADD BRIEF DESCRIPTION HERE]
 * Contributors: ______________________
 * Contributors: ______________________
 */
package org.icefaces.ace.renderkit;

import org.icefaces.ace.util.Constants;

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 java.io.IOException;
import java.util.ListIterator;
import java.util.Map;

public class HeadRenderer extends Renderer {

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

        //Theme
        String theme = null;
        String themeParamValue = context.getExternalContext().getInitParameter(Constants.THEME_PARAM);

        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);
        }

        if (theme == null) theme = "";
        else theme = theme.trim();

        if ("".equals(theme) || theme.equalsIgnoreCase("sam")) {
            encodeTheme(context, "icefaces.ace", "themes/sam/theme.css");
        } else if (theme.equalsIgnoreCase("rime")) {
            encodeTheme(context, "icefaces.ace", "themes/rime/theme.css");
        } else if (!theme.equalsIgnoreCase("none")) {
            encodeTheme(context, "ace-" + theme, "theme.css");
        }

        //Resources
        UIViewRoot viewRoot = context.getViewRoot();
        ListIterator iter = (viewRoot.getComponentResources(context, "head")).listIterator();
        while (iter.hasNext()) {
            UIComponent resource = (UIComponent) iter.next();
            resource.encodeAll(context);
        }
    }

    @Override
    public void encodeChildren(FacesContext context, UIComponent component) throws IOException {
        //no-op
    }

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

        writer.endElement("head");
    }

    private UIComponent createThemeResource(FacesContext fc, String library, String resourceName) {
        UIComponent resource = fc.getApplication().createComponent("javax.faces.Output");
        resource.setRendererType("javax.faces.resource.Stylesheet");

        Map attrs = resource.getAttributes();
        attrs.put("name", resourceName);
        attrs.put("library", library);
        attrs.put("target", "head");

        return resource;
    }

    protected void encodeTheme(FacesContext context, String library, String resource) throws IOException {
        ResponseWriter writer = context.getResponseWriter();
        writer.write("\n");

        Resource themeResource = context.getApplication().getResourceHandler().createResource(resource, library);
        if (themeResource == null) {
            throw new FacesException("Error loading theme, 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", themeResource.getRequestPath(), null);
            writer.endElement("link");
        }


    }
}