/*
* $Id: ViewHandlerImpl.java 471754 2006-11-06 14:55:09Z husted $
*
* 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.struts.faces.application;
import java.io.IOException;
import java.util.Locale;
import javax.faces.FacesException;
import javax.faces.application.ViewHandler;
import javax.faces.component.UIViewRoot;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.Globals;
/**
* <p>Custom <code>ViewHandler</code> implementation that adds features
* specific to the Struts-Faces Integration Library. It leverages the
* "decorator pattern" customization strategy that JSF supports, by
* delegating most processing to the <code>ViewHandler</code> instance
* handed to our constructor.</p>
*/
public class ViewHandlerImpl extends ViewHandler {
// ------------------------------------------------------------ Constructors
/**
* <p>Construct a <code>ViewHandlerImpl</code> decorating the
* specified <code>ViewHandler</code> instance.</p>
*
* @param handler <code>ViewHandler</code> to be decorated
*/
public ViewHandlerImpl(ViewHandler handler) {
if (log.isDebugEnabled()) {
log.debug("Creating ViewHandler instance, wrapping handler " +
handler);
}
this.handler = handler;
}
// ------------------------------------------------------ Instance Variables
/**
* <p>The <code>ViewHandler</code> instance that we are decorating.</p>
*/
private ViewHandler handler = null;
// -------------------------------------------------------- Static Variables
/**
* <p>The <code>Log</code> instance for this class.</p>
*/
private static final Log log =
LogFactory.getLog(ViewHandlerImpl.class);
// -------------------------------------------------------------- Properties
/**
* <p>Return the <code>ViewHandler</code> instance we are decorating.</p>
*/
public ViewHandler getHandler() {
return this.handler;
}
/**
* <p>Set the <code>ViewHandler</code> instance we are decorating.</p>
*
* @param handler <code>ViewHandler</code> instance to decorate
*/
public void setHandler(ViewHandler handler) {
this.handler = handler;
}
// ----------------------------------------------------- Specialized Methods
/**
* <p>If the Struts application has set a <code>Locale</code>, pass it
* on to JSF prior to delegating the actual rendering.</p>
*
* @param context <code>FacesContext</code> for the current request
* @param view <code>UIViewRoot</code> to be rendered
*/
public void renderView(FacesContext context, UIViewRoot view)
throws IOException, FacesException {
if (log.isDebugEnabled()) {
log.debug("renderView(" + view.getViewId() + ")");
}
ExternalContext econtext = context.getExternalContext();
if (econtext.getSession(false) != null) {
Locale locale = (Locale)
econtext.getSessionMap().get(Globals.LOCALE_KEY);
if (locale != null) {
if (log.isTraceEnabled()) {
log.trace("Setting view locale to " + locale);
}
view.setLocale(locale);
}
}
handler.renderView(context, view);
}
// ------------------------------------------------------- Delegated Methods
// See ViewHandler JavaDocs for method descriptions
public Locale calculateLocale(FacesContext context) {
return handler.calculateLocale(context);
}
public String calculateRenderKitId(FacesContext context) {
return handler.calculateRenderKitId(context);
}
public UIViewRoot createView(FacesContext context, String viewId) {
return handler.createView(context, viewId);
}
public String getActionURL(FacesContext context, String viewId) {
return handler.getActionURL(context, viewId);
}
public String getResourceURL(FacesContext context, String viewId) {
return handler.getResourceURL(context, viewId);
}
public UIViewRoot restoreView(FacesContext context, String viewId) {
return handler.restoreView(context, viewId);
}
public void writeState(FacesContext context) throws IOException {
handler.writeState(context);
}
}