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/*
* Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package javax.faces.component;
/**
* This interface is implemented by classes
* that need to save state that is expected to be available only within the scope
* of the current request.
*
*
*
* An implementor must implement both {@link
* #saveTransientState} and {@link #restoreTransientState} methods in this class, since
* these two methods have a tightly coupled contract between themselves.
* In other words, if there is an inheritance hierarchy, it is not
* permissible to have the {@link #saveTransientState} and {@link #restoreTransientState}
* methods reside at different levels of the hierarchy.
*
* An example of transient state is the "submitted" property on forms.
*
*
*
* @since 2.1
*/
public interface TransientStateHolder
{
/**
* Return the object containing related "transient states".
* that could be used later to restore the "transient state".
*
* @param context the Faces context.
* @return object containing transient values
* @since 2.1
*/
public java.lang.Object saveTransientState(javax.faces.context.FacesContext context);
/**
*
Restore the "transient state" using the object passed as
* state.
*
* If the state
* argument is null clear any previous transient
* state if any and return.
*
* @param context the Faces context
* @param state the object containing transient values
* @since 2.1
*/
public void restoreTransientState(javax.faces.context.FacesContext context,
java.lang.Object state);
}