public Class ResponseStateManagerImpl

Overrides javax.faces.render.ResponseStateManager.getCryptographicallyStrongTokenFromSession.

Doc from javax.faces.render.ResponseStateManager.getCryptographicallyStrongTokenFromSession.

Compliant implementations must return a cryptographically strong token for use to protect views in this application. For backwards compatability with earlier revisions, a default implementation is provided that simply returns null.

Parameters

context:FacesContext

the FacesContext for the current request

Returns:String

a cryptographically strong value

Annotations

@Override

Overrides javax.faces.render.ResponseStateManager.getState.

Doc from javax.faces.render.ResponseStateManager.getState.

The implementation must inspect the current request and return an Object representing the tree structure and component state passed in to a previous invocation of writeState(javax.faces.context.FacesContext, java.lang.Object).

If the state saving method for this application is javax.faces.application.StateManager#STATE_SAVING_METHOD_CLIENT, writeState() will have encrypted the state in a tamper evident manner. If the state fails to decrypt, or decrypts but indicates evidence of tampering, a javax.faces.application.ProtectedViewException must be thrown.

For backwards compatability with existing ResponseStateManager implementations, the default implementation of this method calls getTreeStructureToRestore and getComponentStateToRestore and creates and returns a two element Object array with element zero containing the structure property and element one containing the state property of the SerializedView.

Parameters

context:FacesContext

The FacesContext instance for the current request

viewId:String

View identifier of the view to be restored

Returns:Object

the tree structure and component state Object passed in to writeState. If this is an initial request, this method returns null.

Annotations

@Override

See Also

ResponseStateManager#getState(javax.faces.context.FacesContext, java.lang.String)

Overrides javax.faces.render.ResponseStateManager.getTreeStructureToRestore.

Doc from javax.faces.render.ResponseStateManager.getTreeStructureToRestore.

The implementation must inspect the current request and return the tree structure Object passed to it on a previous invocation of writeState().

Parameters

context:FacesContext

The FacesContext instance for the current request

viewId:String

View identifier of the view to be restored

Returns:Object

the tree structure portion of the state

Annotations

@SuppressWarnings:deprecation

@Override

Overrides javax.faces.render.ResponseStateManager.getViewState.

Doc from javax.faces.render.ResponseStateManager.getViewState.

Return the specified state as a String without any markup related to the rendering technology supported by this ResponseStateManager.

Parameters

context:FacesContext

the FacesContext for the current request

state:Object

the state from which the String version will be generated from

Returns:String

the view state for this request without any markup specifics

Annotations

@Override

See Also

ResponseStateManager#getViewState(javax.faces.context.FacesContext, java.lang.Object)

Overrides javax.faces.render.ResponseStateManager.isPostback.

Doc from javax.faces.render.ResponseStateManager.isPostback.

Return true if the current request is a postback. This method is leveraged from the Restore View Phase to determine if javax.faces.application.ViewHandler#restoreView or javax.faces.application.ViewHandler#createView should be called. The default implementation must return true if this ResponseStateManager instance wrote out state on a previous request to which this request is a postback, false otherwise.

The implementation of this method for the Standard HTML RenderKit must consult the javax.faces.context.ExternalContext's requestParameterMap and return true if and only if there is a key equal to the value of the symbolic constant VIEW_STATE_PARAM.

For backwards compatability with implementations of ResponseStateManager prior to JSF 1.2, a default implementation is provided that consults the javax.faces.context.ExternalContext's requestParameterMap and return true if its size is greater than 0.

Parameters

context:FacesContext

the FacesContext for the current request.

Returns:boolean

the value as specified above

Annotations

@Override

See Also

ResponseStateManager#isPostback(javax.faces.context.FacesContext)

Overrides javax.faces.render.ResponseStateManager.isStateless.

Doc from javax.faces.render.ResponseStateManager.isStateless.

If the preceding call to writeState(javax.faces.context.FacesContext, java.lang.Object) was stateless, return true. If the preceding call to writeState() was stateful, return false. Otherwise throw IllegalStateException.

Parameters

facesContext:FacesContext

the Faces context.

viewId:String

the view id.

Returns:boolean

true if "stateless" was found, false otherwise.

Annotations

@Override

Exceptions

IllegalStateException:

when the request is not a postback.

Overrides javax.faces.render.ResponseStateManager.writeState.

Doc from javax.faces.render.ResponseStateManager.writeState.

Take the argument state and write it into the output using the current ResponseWriter, which must be correctly positioned already.

Call FacesContext#getViewRoot(). If javax.faces.component.UIComponent#isTransient() returns true, take implementation specific action so that the following call to isStateless returns true and return. Otherwise, proceed as follows.

If the state is to be written out to hidden fields, the implementation must take care to make all necessary character replacements to make the Strings suitable for inclusion as an HTTP request paramater.

If the state saving method for this application is javax.faces.application.StateManager#STATE_SAVING_METHOD_CLIENT, the implementation must encrypt the state to be saved to the client in a tamper evident manner.

If the state saving method for this application is javax.faces.application.StateManager#STATE_SAVING_METHOD_SERVER, and the current request is an Ajax request javax.faces.context.PartialViewContext#isAjaxRequest returns true), use the current view state identifier if it is available (do not generate a new identifier).

Write out the render kit identifier associated with this ResponseStateManager implementation with the name as the value of the String constant ResponseStateManager.RENDER_KIT_ID_PARAM. The render kit identifier must not be written if:

• it is the default render kit identifier as returned by javax.faces.application.Application#getDefaultRenderKitId() or
• the render kit identfier is the value of javax.faces.render.RenderKitFactory.HTML_BASIC_RENDER_KIT and javax.faces.application.Application#getDefaultRenderKitId() returns null.

For backwards compatability with existing ResponseStateManager implementations, the default implementation of this method checks if the argument is an instance of SerializedView. If so, it calls through to writeState(javax.faces.context.FacesContext, javax.faces.application.StateManager.SerializedView). If not, it expects the state to be a two element Object array. It creates an instance of SerializedView and stores the state as the treeStructure, and passes it to writeState(javax.faces.context.FacesContext, javax.faces.application.StateManager.SerializedView).

The javax.faces.lifecycle.ClientWindow must be written using these steps. Call javax.faces.context.ExternalContext#getClientWindow. If the result is null, take no further action regarding the ClientWindow. If the result is non-null, write a hidden field whose name is CLIENT_WINDOW_PARAM and whose id is <VIEW_ROOT_CONTAINER_CLIENT_ID><SEP>javax.faces.ClientWindow<SEP><UNIQUE_PER_VIEW_NUMBER> where <SEP> is the currently configured UINamingContainer.getSeparatorChar(). <VIEW_ROOT_CONTAINER_CLIENT_ID> is the return from UIViewRoot.getContainerClientId() on the view from whence this state originated. <UNIQUE_PER_VIEW_NUMBER> is a number that must be unique within this view, but must not be included in the view state. The value of the field is implementation dependent but must uniquely identify this window within the user's session.

Parameters

context:FacesContext

The FacesContext instance for the current request

state:Object

The serialized state information previously saved

Annotations

@Override

Exceptions

IOException:

if the state argument is not an array of length 2.

See Also

ResponseStateManager#writeState(javax.faces.context.FacesContext, java.lang.Object)