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 package javax.faces.context;
20
21 /**
22 * Stores the first instance of the ExternalContext in the
23 * field _firstInstance. We cannot put this field directly
24 * into ExternalContext, because this can cause classloading
25 * problems when accessing it from myfaces-impl when Mojarra is
26 * also on the classpath.
27 */
28 final class _MyFacesExternalContextHelper
29 {
30
31 /**
32 * This variable holds the firstInstance where all ExternalContext
33 * objects should call when new jsf 2.0 methods are called.
34 *
35 * This variable is an implementation detail and should be
36 * initialized and released on FacesContextFactoryImpl (because
37 * this is the place where ExternalContextFactory.getExternalContext()
38 * is called).
39 *
40 * The objective of this is keep compatibility of libraries that wrap
41 * ExternalContext objects before 2.0. It is similar as FacesContext._firstInstace,
42 * but since we don't have any place to init and release this variable properly
43 * we should do it using reflection.
44 */
45 static ThreadLocal<ExternalContext> firstInstance = new ThreadLocal<ExternalContext>();
46
47 /**
48 * this class should not be instantiated.
49 */
50 private _MyFacesExternalContextHelper()
51 {
52 }
53
54 }