/*
* 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.orchestra.viewController.jsf;
import javax.faces.context.FacesContext;
import javax.faces.el.EvaluationException;
import javax.faces.el.VariableResolver;
import org.apache.myfaces.orchestra.viewController.DefaultViewControllerManager;
import org.apache.myfaces.orchestra.viewController.ViewControllerManager;
/**
* Provides a way to access the viewController through the JSF expression language (EL)
* using the special variable name <code>oxViewController</code>.
*/
public class ViewControllerVariableResolver extends VariableResolver
{
private final static String VIEW_CONTROLLER_VARIABLE = "oxViewController";
private final static ViewControllerManager DEFAULT_VCM = new DefaultViewControllerManager();
private final VariableResolver original;
public ViewControllerVariableResolver(VariableResolver original)
{
this.original = original;
}
public Object resolveVariable(FacesContext facesContext, String variableName) throws EvaluationException
{
if (VIEW_CONTROLLER_VARIABLE.equals(variableName))
{
ViewControllerManager manager = getViewControllerManager(facesContext);
return manager.getViewController(facesContext.getViewRoot().getViewId());
}
return original.resolveVariable(facesContext, variableName);
}
static ViewControllerManager getViewControllerManager(FacesContext context)
{
ViewControllerManager manager = (ViewControllerManager) context.getApplication()
.getVariableResolver().resolveVariable(
context, ViewControllerManager.VIEW_CONTROLLER_MANAGER_NAME);
if (manager != null)
{
return manager;
}
return DEFAULT_VCM;
}
}