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.component;
20
21 /**
22 * <p>This interface is implemented by classes
23 * that need to save state that are expected to be available only on the
24 * current request.</p>
25 *
26 * <p>An implementor <strong>must</strong> implement both {@link
27 * #saveTransientState} and {@link #restoreTransientState} methods in this class, since
28 * these two methods have a tightly coupled contract between themselves.
29 * In other words, if there is an inheritance hierarchy, it is not
30 * permissible to have the {@link #saveTransientState} and {@link #restoreTransientState}
31 * methods reside at different levels of the hierarchy.</p>
32 *
33 * @since 2.1
34 */
35 public interface TransientStateHolder
36 {
37 /**
38 * <p>Return the object containing related "transient states".
39 * that could be used later to restore the "transient state".<p>
40 *
41 * @param context
42 * @return object containing transient values
43 * @since 2.1
44 */
45 public java.lang.Object saveTransientState(javax.faces.context.FacesContext context);
46
47 /**
48 * <p>Restore the "transient state" using the object passed as
49 * state.</p>
50 *
51 * <p>If the <code>state</code>
52 * argument is <code>null</code> clear any previous transient
53 * state if any and return.</p>
54 *
55 * @param context
56 * @param state the object containing transient values
57 * @since 2.1
58 */
59 public void restoreTransientState(javax.faces.context.FacesContext context,
60 java.lang.Object state);
61
62 }