/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.myfaces.trinidadinternal.renderkit.core.xhtml;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import javax.faces.component.UIComponent;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import org.apache.myfaces.trinidad.bean.FacesBean;
import org.apache.myfaces.trinidad.component.core.CoreStyleSheet;
import org.apache.myfaces.trinidad.context.RenderingContext;
import org.apache.myfaces.trinidadinternal.agent.TrinidadAgent;
import org.apache.myfaces.trinidadinternal.renderkit.core.CoreRenderingContext;
import org.apache.myfaces.trinidadinternal.style.StyleContext;
import org.apache.myfaces.trinidadinternal.style.StyleProvider;
/**
* Renderer for meta data section of the document--a.k.a <head>.
* <p>
* @version $Name: $ ($Revision: adfrt/faces/adf-faces-impl/src/main/java/oracle/adfinternal/view/faces/renderkit/core/xhtml/StyleSheetRenderer.java#0 $) $Date: 10-nov-2005.19:02:29 $
*/
public class StyleSheetRenderer extends XhtmlRenderer
{
public StyleSheetRenderer()
{
this(CoreStyleSheet.TYPE);
}
protected StyleSheetRenderer(
FacesBean.Type type)
{
super(type);
}
@Override
public boolean getRendersChildren()
{
return true;
}
@Override
protected void encodeAll(
FacesContext context,
RenderingContext rc,
UIComponent comp,
FacesBean bean
) throws IOException
{
ResponseWriter writer = context.getResponseWriter();
StyleContext sContext = ((CoreRenderingContext) rc).getStyleContext();
StyleProvider provider = sContext.getStyleProvider();
if (provider != null)
{
List<String> uris = provider.getStyleSheetURIs(sContext);
// Check if we want to write out the css into the page or not. In portlet mode the
// producer tries to share the consumer's stylesheet if it matches exactly.
boolean suppressStylesheet = _isSuppressStylesheet(context, rc);
if (!suppressStylesheet)
{
if (uris != null && !uris.isEmpty())
{
ExternalContext externalContext = context.getExternalContext();
String contextUri = externalContext.getRequestContextPath();
String baseURL = contextUri + XhtmlConstants.STYLES_CACHE_DIRECTORY;
String outputMode = rc.getOutputMode();
// =-=AEW Don't like hardcoding facet names...
if (XhtmlConstants.OUTPUT_MODE_PORTLET.equals(outputMode) &&
supportsScripting(rc))
{
writer.startElement("script", null);
writer.writeText("var _adfSS;if(!_adfSS){_adfSS=1;", null);
for (String uri : uris)
{
writer.writeText("document.write(\"" +
"<link rel=\\\"stylesheet\\\" "+
"charset=\\\"UTF-8\\\" type=\\\"text/css\\\" " +
"href=\\\"",
null);
uri = context.getExternalContext().encodeResourceURL(baseURL + uri);
writer.writeText(uri, null);
writer.writeText("\\\">\");", null);
}
writer.writeText("}", null);
writer.endElement("script");
}
else
{
for (String uri : uris)
{
writer.startElement("link", null);
renderId(context, comp);
writer.writeAttribute("rel", "stylesheet", null);
writer.writeAttribute("charset", "UTF-8", null);
String type = provider.getContentStyleType(sContext);
writer.writeAttribute("type", type, null);
renderEncodedResourceURI(context, "href", baseURL + uri);
writer.endElement("link");
}
}
}
else
{
if (rc.getSkin() == null)
writer.writeComment("ERROR: Could not create stylesheet, because " +
"no skin is available");
else
writer.writeComment("ERROR: could not create stylesheet for " +
rc.getSkin().getStyleSheetName());
}
}
// Hand the Faces-major renderers the style Map for compressing.
// Oddly enough, this code has to be after provider.getStyleSheetURI(),
// because that call boostraps up the style provider in general.
if (rc instanceof CoreRenderingContext)
{
Map<String, String> shortStyles = rc.getSkin().getStyleClassMap(rc);
((CoreRenderingContext) rc).setStyleMap(shortStyles);
}
}
}
// In the portlet environment, the consumer might like the producers to share its stylesheet
// for performance reasons. To indicate this the producer sends a
// suppress stylesheet parameter on the request map.
// Also, if the Agent Capability cannot handle external css files, this will
// return true.
// returns true if the stylesheet should be suppressed and not written out in the page.
private boolean _isSuppressStylesheet(
FacesContext context,
RenderingContext rc)
{
// first see if the agent's capability does not support external css files.
if (!_supportsExternalStylesheet(rc))
return true;
// next check if in portlet mode, and if the suppress stylesheet parameter
// is set, and it's valid to suppress the stylesheet.
String outputMode = rc.getOutputMode();
if (XhtmlConstants.OUTPUT_MODE_PORTLET.equals(outputMode))
{
Map<String, Object> requestMap = context.getExternalContext().getRequestMap();
boolean suppressStylesheet = "true".equals(requestMap.get(_SUPPRESS_STYLESHEET_ID_PARAM));
if (suppressStylesheet)
{
// the portlet producer requests that we suppress the stylesheet if the producer's skin
// and the consumer's skin match exactly.
return ((CoreRenderingContext) rc).isRequestMapStyleSheetIdAndSkinEqual(
context, rc.getSkin());
}
}
return false;
}
// Get the Capability from the agent and return true if the
// TrinidadAgent.CAP_STYLE_ATTRIBUTES == STYLES_EXTERNAL.
// Defaults to true in case no capability is set.
static private boolean _supportsExternalStylesheet(
RenderingContext rc)
{
Object styleCapability = rc.getAgent().getCapabilities().get(
TrinidadAgent.CAP_STYLE_ATTRIBUTES);
return (styleCapability == null ||
TrinidadAgent.STYLES_EXTERNAL == styleCapability);
}
static private final String _SUPPRESS_STYLESHEET_ID_PARAM =
"org.apache.myfaces.trinidad.skin.suppressStylesheet";
}