package org.apache.myfaces.tobago.util;
/*
* 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.
*/
import javax.faces.application.Application;
import javax.faces.context.FacesContext;
import javax.faces.el.VariableResolver;
import javax.faces.el.ValueBinding;
public class VariableResolverUtil {
private VariableResolverUtil() {
}
public static Object resolveVariable(FacesContext context, String variable) {
Application application = context.getApplication();
VariableResolver variableResolver = application.getVariableResolver();
return variableResolver.resolveVariable(context, variable);
}
/**
* Clears the value of the variable.
* Useful for cleaning up e.g. a session or application variable
* to save memory without the knowledge of the scope.
* Also useful to enforce a new creation of a managed-bean.
*
* @param context
* @param variable
*/
public static void clearVariable(FacesContext context, String variable) {
Application application = context.getApplication();
ValueBinding valueBinding = application.createValueBinding("#{" + variable + "}");
valueBinding.setValue(context, null);
}
}