javax.faces.component.StateHolder Maven / Gradle / Ivy
Show all versions of javax.faces Show documentation
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.faces.component;
import javax.faces.context.FacesContext;
/**
*
* This interface is
* implemented by classes that need to save their state between
* requests.
*
* An implementor must implement both {@link
* #saveState} and {@link #restoreState} methods in this class, since
* these two methods have a tightly coupled contract between themselves.
* In other words, if there is an ineritance hierarchy, it is not
* permissable to have the {@link #saveState} and {@link #restoreState}
* methods reside at different levels of the hierarchy.
*
* An implementor must have a public no-args constructor.
*
*/
public interface StateHolder {
/**
* Gets the state of the instance as a
* Serializable Object.
*
*
If the class that implements this interface has references to
* instances that implement StateHolder (such as a
* UIComponent with event handlers, validators, etc.)
* this method must call the {@link #saveState} method on all those
* instances as well. This method must not save the state
* of children and facets. That is done via the {@link
* javax.faces.application.StateManager}
*
* This method must not alter the state of the implementing
* object. In other words, after executing this code:
*
*
* Object state = component.saveState(facesContext);
* component should be the same as before executing
* it.
*
* The return from this method must be Serializable
*
* @throws NullPointerException if context is null
*/
public Object saveState(FacesContext context);
/**
*
* Perform any
* processing required to restore the state from the entries in the
* state Object.
*
* If the class that implements this interface has references to
* instances that also implement StateHolder (such as a
* UIComponent with event handlers, validators, etc.)
* this method must call the {@link #restoreState} method on all those
* instances as well.
* If the state
* argument is null, take no action and return.
*
* @throws NullPointerException if context is null.
*/
public void restoreState(FacesContext context, Object state);
/**
*
* If true, the Object implementing this interface must not
* participate in state saving or restoring.
*/
public boolean isTransient();
/**
* Denotes
* whether or not the Object implementing this interface must or
* must not participate in state saving or restoring.
*
* @param newTransientValue boolean pass true if this
* Object will not
* participate in state saving or restoring, otherwise pass
* false.
*/
public void setTransient(boolean newTransientValue);
}