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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.

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package javax.faces.view;

import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;

/**
 * 

Encapsulate 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 null for JSP views and non-null for * views authored in Facelets for JSF 2, this specification only applys * to Facelets for JSF 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. *

* * @since 2.0 */ public abstract class StateManagementStrategy { /** *

Return the state of the * current view in an Object that implements * Serializable and * can be passed to * java.io.ObjectOutputStream.writeObject() without * causing a java.io.NotSerializableException to be * thrown. The default implementation must perform the * following algorithm or its semantic equivalent, explicitly performing all the steps * listed here.

* *
*
  1. If the UIViewRoot of the current view is marked transient, return null immediately.

  2. Traverse the view and verify that each of the client ids are unique. Throw IllegalStateException if more than one client id are the same.

  3. Visit the tree using {@link javax.faces.component.UIComponent#visitTree}. For each node, call {@link javax.faces.component.UIComponent#saveState}, saving the returned Object 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.

*

The implementation must ensure that the {@link * javax.faces.component.UIComponent#saveState} method is called for * each node in the tree.

*

The data structure used to save the state obtained by * executing the above algorithm must be Serializable, * and all of the elements within the data structure must also be * Serializable.

*
* @param context the FacesContext for this request. * * @since 2.0 */ public abstract Object saveView(FacesContext context); /** *

Restore the state of the view * with information in the request. The default implementation must * perform the following algorithm or its semantic equivalent.

* *
*
  1. 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 viewId, and from that call {@link ViewMetadata#createMetadataView}. Store the resultant {@link UIViewRoot} in the {@link FacesContext}. Obtain the state of the UIViewRoot from the state Object returned from {@link javax.faces.render.ResponseStateManager#getState} and pass that to {@link UIViewRoot#restoreViewScopeState}.

    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 will contain components that were programmatically deleted on the previous lifecycle run. Both of these cases must be handled.

  2. Call {@link javax.faces.render.ResponseStateManager#getState} to obtain the data structure returned from the previous call to {@link #saveView}.

  3. 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.

  4. Ensure that any programmatically deleted components are removed.

  5. Ensure any programmatically added components are added.

*

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.

*
* * @param context the FacesContext 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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