1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19
20 package org.apache.myfaces.tobago.util;
21
22 import javax.el.ELContext;
23 import javax.faces.context.FacesContext;
24
25 public final class VariableResolverUtils {
26
27 private VariableResolverUtils() {
28 // utils class
29 }
30
31 /**
32 * Returns the requested object configured in the faces-config or from library.
33 */
34 public static Object resolveVariable(final FacesContext context, final String variable) {
35 final ELContext elContext = context.getELContext();
36 return elContext.getELResolver().getValue(elContext, null, variable);
37 }
38
39 /**
40 * Clears the value of the variable.
41 * Useful for cleaning up e.g. a session or application variable
42 * to save memory without the knowledge of the scope.
43 * Also useful to enforce a new creation of a managed-bean.
44 */
45 public static void clearVariable(final FacesContext context, final String variable) {
46 final ELContext elContext = context.getELContext();
47 elContext.getELResolver().setValue(elContext, null, variable, null);
48 }
49 }