com.sun.faces.renderkit

Class StateHelper

java.lang.Object

com.sun.faces.renderkit.StateHelper

Direct Known Subclasses:

ClientSideStateHelper, ServerSideStateHelper

public abstract class StateHelper
extends Object

Common code for the default StateHelper implementations.

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	compressViewState Flag indicating whether or not view state should be compressed to reduce the memory/bandwidth footprint.
protected char[]	fieldEnd This will be used the by the different StateHelper implementations when writing the end of the state or viewId field.
protected char[]	fieldMiddle This will be used by the different StateHelper implementations when writing the middle of the state or viewId fields.
protected SerializationProvider	serialProvider Factory for serialization streams.
protected char[]	stateFieldStart This will be used the by the different StateHelper implementations when writing the start of the state field.
protected WebConfiguration	webConfig Access to the context init parameters that configure this application.

Constructor Summary

Constructors

Constructor and Description
StateHelper() Constructs a new StateHelper instance.

Method Summary

Modifier and Type	Method and Description
static void	createAndStoreCryptographicallyStrongTokenInSession(javax.servlet.http.HttpSession session)
String	getCryptographicallyStrongTokenFromSession(FacesContext context)
abstract Object	getState(FacesContext ctx, String viewId)
protected static String	getStateParamValue(FacesContext context) Get our view state from this request
abstract boolean	isStateless(FacesContext ctx, String viewId)
protected void	writeClientWindowField(FacesContext context, ResponseWriter writer) Write the client window state field.
protected void	writeRenderKitIdField(FacesContext context, ResponseWriter writer) If a custom RenderKit is used, write out the ID of the RenderKit out as a hidden field.
abstract void	writeState(FacesContext ctx, Object state, StringBuilder stateCapture) Functionally similar to ResponseStateManager#writeState(FacesContext, Object) with an option to write the state directly to the provided StringBuilder without sending any markup to the client.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

serialProvider

protected SerializationProvider serialProvider

Factory for serialization streams. These are pluggable via the WebConfiguration.WebContextInitParameter#SerializationProviderClass.

webConfig

protected WebConfiguration webConfig

Access to the context init parameters that configure this application.

compressViewState

protected boolean compressViewState

Flag indicating whether or not view state should be compressed to reduce the memory/bandwidth footprint. This option is common to both types of state saving.

stateFieldStart

protected char[] stateFieldStart

This will be used the by the different StateHelper implementations when writing the start of the state field.

fieldMiddle

protected char[] fieldMiddle

This will be used by the different StateHelper implementations when writing the middle of the state or viewId fields.

fieldEnd

protected char[] fieldEnd

This will be used the by the different StateHelper implementations when writing the end of the state or viewId field. This value of this field is determined by the value of the WebConfiguration.BooleanWebContextInitParameter.AutoCompleteOffOnViewState

Constructor Detail

StateHelper

public StateHelper()

Constructs a new StateHelper instance.

Method Detail

createAndStoreCryptographicallyStrongTokenInSession

public static void createAndStoreCryptographicallyStrongTokenInSession(javax.servlet.http.HttpSession session)

getCryptographicallyStrongTokenFromSession

public String getCryptographicallyStrongTokenFromSession(FacesContext context)

writeState

public abstract void writeState(FacesContext ctx,
                                Object state,
                                StringBuilder stateCapture)
                         throws IOException

Functionally similar to ResponseStateManager#writeState(FacesContext, Object) with an option to write the state directly to the provided StringBuilder without sending any markup to the client.

Throws:

IOException

See Also:

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

getState

public abstract Object getState(FacesContext ctx,
                                String viewId)
                         throws IOException

Throws:

IOException

See Also:

ResponseStateManager.getState(javax.faces.context.FacesContext, String)

isStateless

public abstract boolean isStateless(FacesContext ctx,
                                    String viewId)
                             throws IllegalStateException

Throws:

IllegalStateException

See Also:

ResponseStateManager.isStateless(javax.faces.context.FacesContext, String)

getStateParamValue

protected static String getStateParamValue(FacesContext context)

Get our view state from this request

Parameters:

context - the FacesContext for the current request

Returns:

the view state from this request

writeRenderKitIdField

protected void writeRenderKitIdField(FacesContext context,
                                     ResponseWriter writer)
                              throws IOException

If a custom RenderKit is used, write out the ID of the RenderKit out as a hidden field. This will be used when restoring the view state.

Parameters:

context - the FacesContext for the current request

writer - the ResponseWriter to write to

Throws:

IOException - if an error occurs writing to the client

writeClientWindowField

protected void writeClientWindowField(FacesContext context,
                                      ResponseWriter writer)
                               throws IOException

Write the client window state field.

Parameters:

context - the Faces context.

writer - the response writer.

Throws:

IOException - when an I/O error occurs.