/*
* 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.tobago.example.demo;
import org.apache.commons.lang.StringUtils;
import org.apache.myfaces.tobago.context.ResourceManagerUtils;
import org.apache.myfaces.tobago.util.VariableResolverUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.faces.application.NavigationHandler;
import javax.faces.application.ViewHandler;
import javax.faces.component.UIViewRoot;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
public class MultiplePageDeclarationLanguageNavigationHandler extends NavigationHandler {
private static final Logger LOG = LoggerFactory.getLogger(MultiplePageDeclarationLanguageNavigationHandler.class);
private NavigationHandler navigationHandler;
public MultiplePageDeclarationLanguageNavigationHandler(final NavigationHandler navigationHandler) {
this.navigationHandler = navigationHandler;
}
public void handleNavigation(final FacesContext facesContext, final String fromAction, String outcome) {
final String original = outcome;
if (outcome != null) {
final PageDeclarationLanguageBean bean = (PageDeclarationLanguageBean)
VariableResolverUtils.resolveVariable(facesContext, "pageDeclarationLanguage");
for (final PageDeclarationLanguage renderTechnology : PageDeclarationLanguage.values()) {
if (outcome.endsWith(renderTechnology.getExtension())) {
outcome = outcome.substring(0, outcome.lastIndexOf(renderTechnology.getExtension()));
}
}
if (pageExists(facesContext, outcome, bean.getLanguage().getExtension())) {
outcome = outcome + bean.getLanguage().getExtension();
} else {
for (final PageDeclarationLanguage renderTechnology : PageDeclarationLanguage.values()) {
if (pageExists(facesContext, outcome, renderTechnology.getExtension())) {
bean.setLanguage(renderTechnology);
outcome = outcome + bean.getLanguage().getExtension();
break;
}
}
}
}
LOG.info("Original outcome='"+ original + "', adjusted outcome = '"+ outcome +"'");
if (StringUtils.startsWith(outcome, "/content/")) {
final ViewHandler viewHandler = facesContext.getApplication().getViewHandler();
final UIViewRoot viewRoot = viewHandler.createView(facesContext, outcome);
facesContext.setViewRoot(viewRoot);
final ExternalContext externalContext = facesContext.getExternalContext();
try {
externalContext.redirect(
externalContext.encodeRedirectURL("/faces" + outcome, Collections.<String, List<String>>emptyMap()));
} catch (final IOException e) {
// not nice?
facesContext.renderResponse();
}
} else {
navigationHandler.handleNavigation(facesContext, fromAction, outcome);
}
}
private boolean pageExists(final FacesContext facesContext, final String outcome, final String extension) {
if (StringUtils.isEmpty(outcome)) {
return false;
}
final String path = ResourceManagerUtils.getImageWithPath(facesContext, outcome.substring(1) + extension, true);
return path != null;
}
}