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/*
* 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.view;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
/**
* <p class="changed_added_2_0"><span
* class="changed_modified_2_2">Encapsulate</span> the saving and
* restoring of the view to enable the VDL to take over the
* responsibility for handling this feature. Because {@link
* ViewDeclarationLanguage#getStateManagementStrategy} is required to
* return <code>null</code> for JSP views and non-<code>null</code> for
* views authored in Facelets for JSF 2, this specification only applys
* to Facelets for JSF 2.</p>
*
* <p class="changed_added_2_2">Implementations must call
* {@link javax.faces.component.UIComponent#visitTree} on the
* {@link javax.faces.component.UIViewRoot} to perform the saving and restoring
* of the view in the {@link #saveView} and {@link #restoreView} methods,
* respectively.
* </p>
*
* @since 2.0
*/
public abstract class StateManagementStrategy {
/**
* <p class="changed_added_2_0"><span
* class="changed_modified_2_2">Return</span> the state of the
* current view in an <code>Object</code> that implements
* <code>Serializable</code> <span class="changed_modified_2_2">and
* can be passed to
* <code>java.io.ObjectOutputStream.writeObject()</code> without
* causing a <code>java.io.NotSerializableException</code> to be
* thrown.</span> The default implementation must perform the
* following algorithm or its semantic equivalent, <span
* class="changed_modified_2_2">explicitly performing all the steps
* listed here.</span></p>
*
* <div class="changed_added_2_0">
* <ol>
<li><p>If the <code>UIViewRoot</code> of the current view is
marked <code>transient</code>, return <code>null</code>
immediately. </p></li>
<li><p>Traverse the view and verify that each of the client ids
are unique. Throw <code>IllegalStateException</code> if more
than one client id are the same.</p></li>
<li><p>Visit the tree using {@link
javax.faces.component.UIComponent#visitTree}. For each node,
call {@link javax.faces.component.UIComponent#saveState},
saving the returned <code>Object</code> in a way such that it
can be restored given only its client id. Special care must
be taken to handle the case of components that were added or
deleted programmatically during this lifecycle traversal,
rather than by the VDL. </p></li>
</ol>
* <p>The implementation must ensure that the {@link
* javax.faces.component.UIComponent#saveState} method is called for
* each node in the tree.</p>
* <p>The data structure used to save the state obtained by
* executing the above algorithm must be <code>Serializable</code>,
* and all of the elements within the data structure must also be
* <code>Serializable</code>.</p>
* </div>
* @param context the <code>FacesContext</code> for this request.
*
* @since 2.0
*/
public abstract Object saveView(FacesContext context);
/**
* <p class="changed_added_2_0"><span
* class="changed_modified_2_2">Restore</span> the state of the view
* with information in the request. The default implementation must
* perform the following algorithm or its semantic equivalent.</p>
*
* <div class="changed_added_2_0">
* <ol>
<li>
<p class="changed_added_2_2">As in the case of restore view on
an initial request, the view metadata must be restored and
properly handled as well. Obtain the {@link ViewMetadata} for
the current <code>viewId</code>, and from that call {@link
ViewMetadata#createMetadataView}. Store the resultant {@link
UIViewRoot} in the {@link FacesContext}. Obtain the state of
the <code>UIViewRoot</code> from the state <code>Object</code>
returned from {@link
javax.faces.render.ResponseStateManager#getState} and pass
that to {@link UIViewRoot#restoreViewScopeState}.</p>
<p>Build the view from the markup. For all components in
the view that do not have an explicitly assigned id in the
markup, the values of those ids must be the same as on an
initial request for this view. This view will not contain
any components programmatically added during the previous
lifecycle run, and it <b>will</b> contain components that were
programmatically deleted on the previous lifecycle run. Both
of these cases must be handled.</p>
</li>
<li><p>Call {@link
javax.faces.render.ResponseStateManager#getState} to obtain
the data structure returned from the previous call to {@link
#saveView}.</p></li>
<li><p>Visit the tree using {@link
javax.faces.component.UIComponent#visitTree}. For each node,
call {@link javax.faces.component.UIComponent#restoreState},
passing the state saved corresponding to the current client
id.</p></li>
<li><p>Ensure that any programmatically deleted components are
removed.</p></li>
<li><p>Ensure any programmatically added components are added.
</p></li>
</ol>
* <p>The implementation must ensure that the {@link
* javax.faces.component.UIComponent#restoreState} method is called
* for each node in the tree, except for those that were
* programmatically deleted on the previous run through the
* lifecycle.</p>
* </div>
*
* @param context the <code>FacesContext</code> for this request
* @param viewId the view identifier for which the state should be restored
* @param renderKitId the render kit id for this state.
* @since 2.0
*/
public abstract UIViewRoot restoreView(FacesContext context, String viewId,
String renderKitId);
}
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