/*
* JBoss, Home of Professional Open Source
* Copyright 2013, Red Hat, Inc. and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.richfaces.application.push.impl;
import java.util.concurrent.atomic.AtomicReference;
import java.util.regex.Pattern;
import javax.faces.context.FacesContext;
import javax.servlet.ServletContext;
import org.richfaces.application.configuration.ConfigurationServiceHelper;
import org.richfaces.application.push.PushContext;
import org.richfaces.application.push.PushContextFactory;
import org.richfaces.application.push.PushContextInitializationException;
import org.richfaces.application.CoreConfiguration;
/**
* @see PushContextFactory
*
* @author Nick Belaevski
*/
public class PushContextFactoryImpl implements PushContextFactory {
public static final String PUSH_HANDLER_MAPPING_ATTRIBUTE = PushContextFactoryImpl.class.getName();
public static final String PUSH_CONTEXT_RESOURCE_NAME = "__richfaces_push";
private static final AtomicReference<PushContext> PUSH_CONTEXT_HOLDER = new AtomicReference<PushContext>();
/*
* (non-Javadoc)
*
* @see org.richfaces.application.push.PushContextFactory#getPushContext()
*/
@Override
public PushContext getPushContext() {
if (PUSH_CONTEXT_HOLDER.get() == null) {
synchronized (PUSH_CONTEXT_HOLDER) {
if (PUSH_CONTEXT_HOLDER.get() == null) {
PushContext pushContext = createInstance();
PUSH_CONTEXT_HOLDER.set(pushContext);
}
}
}
return PUSH_CONTEXT_HOLDER.get();
}
private static PushContext createInstance() {
FacesContext facesContext = FacesContext.getCurrentInstance();
if (facesContext == null) {
throw new PushContextInitializationException(
"FacesContext is not available when trying to initialize PushContext - use startup initialization (web.xml context-param org.richfaces.application.push.initializeOnStartup = true)");
}
String pushHandlerMapping = (String) facesContext.getExternalContext().getApplicationMap()
.get(PUSH_HANDLER_MAPPING_ATTRIBUTE);
if (pushHandlerMapping == null) {
pushHandlerMapping = ConfigurationServiceHelper.getStringConfigurationValue(facesContext,
CoreConfiguration.Items.pushHandlerMapping);
facesContext.getExternalContext().getApplicationMap().put(PUSH_HANDLER_MAPPING_ATTRIBUTE, pushHandlerMapping);
}
PushContextImpl pushContext = new PushContextImpl(convertMappingToUrl(facesContext, pushHandlerMapping));
pushContext.init(facesContext);
return pushContext;
}
private static String convertMappingToUrl(FacesContext facesContext, String mapping) {
if (mapping == null) {
return mapping;
}
String url = mapping.replaceAll(Pattern.quote("*"), PUSH_CONTEXT_RESOURCE_NAME);
if (!url.startsWith("/")) {
url = '/' + url;
}
return getApplicationContextName(facesContext) + url;
}
private static String getApplicationContextName(FacesContext facesContext) {
Object contextObject = facesContext.getExternalContext().getContext();
if (contextObject instanceof ServletContext) {
return ((ServletContext) contextObject).getContextPath();
}
return "/";
}
}