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 }