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This is the master POM file for Sun's Implementation of the JSF 2.1 Specification.

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package javax.faces.render;

import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.application.StateManager;
import javax.faces.application.StateManager.SerializedView;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;




/**
 * 

* ResponseStateManager * is the helper class to {@link javax.faces.application.StateManager} * that knows the specific rendering technology being used to generate * the response. It is a singleton abstract class, vended by the {@link * RenderKit}. This class knows the mechanics of saving state, whether * it be in hidden fields, session, or some combination of the two.

*/ public abstract class ResponseStateManager { private static Logger log = Logger.getLogger("javax.faces.render"); /** *

The name of the request parameter used by the default * implementation of {@link * javax.faces.application.ViewHandler#calculateRenderKitId} to * derive a RenderKit ID.

*/ public static final String RENDER_KIT_ID_PARAM = "javax.faces.RenderKitId"; /** *

Implementations must use this * constant field value as the name of the client parameter in which * to save the state between requests. The id attribute must be a * concatenation of the return from {@link * javax.faces.component.UIViewRoot#getContainerClientId}, the * return from {@link * javax.faces.component.UINamingContainer#getSeparatorChar}, this * constant field value, the separator char, and a number that is * guaranteed to be unique with respect to all the other instances of * this kind of client parameter in the view. * *

*

It is strongly recommend that * implementations guard against cross site scripting attacks by at * least making the value of this parameter difficult to * predict.

* * @since 1.2 */ public static final String VIEW_STATE_PARAM = "javax.faces.ViewState"; /** *

The name of the hidden field that * refers to the encoded ClientWindow. This field is only used if * {@link javax.faces.lifecycle.ClientWindow#CLIENT_WINDOW_MODE_PARAM_NAME} * is not "none". The id attribute must be a * concatenation of the return from {@link * javax.faces.component.UIViewRoot#getContainerClientId}, the * return from {@link * javax.faces.component.UINamingContainer#getSeparatorChar}, this * constant field value, the separator char, and a number that is * guaranteed to be unique with respect to all the other instances of * this kind of client parameter in the view. The value of this parameter * is the return from {@link javax.faces.lifecycle.ClientWindow#getId}.

* * @since 2.2 * */ public static final String CLIENT_WINDOW_PARAM = "javax.faces.ClientWindow"; /** *

The name of the URL query parameter for transmitting * the client window id. This parameter is only used if * {@link javax.faces.lifecycle.ClientWindow#CLIENT_WINDOW_MODE_PARAM_NAME} * is not "none". The name of the parameter is given by the constant value * of this field. The value of this parameter * is the return from {@link javax.faces.lifecycle.ClientWindow#getId}. *

* * @since 2.2 */ public static final String CLIENT_WINDOW_URL_PARAM = "jfwid"; /** *

The value of this constant is taken * to be the name of a request parameter whose value is inspected * to verify the safety of an incoming non-postback request with respect * to the currently configured Set of protected views * for this application.

* * @since 2.2 */ public static final String NON_POSTBACK_VIEW_TOKEN_PARAM = "javax.faces.Token"; /** *

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

* *

Call {@link FacesContext#getViewRoot()}. * If {@link javax.faces.component.UIComponent#isTransient()} * returns {@code true}, take implementation specific action so that the * following call to {@link #isStateless} returns {@code 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 {@link * 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 {@link * javax.faces.application.StateManager#STATE_SAVING_METHOD_SERVER}, * and the current request is an Ajax request * {@link 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 * {@link javax.faces.application.Application#getDefaultRenderKitId()} or
  • *
  • the render kit identfier is the value of * javax.faces.render.RenderKitFactory.HTML_BASIC_RENDER_KIT and * {@link 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 {@link * #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 {@link * #writeState(javax.faces.context.FacesContext,javax.faces.application.StateManager.SerializedView)}.

* *

The {@link * javax.faces.lifecycle.ClientWindow} must be written using these * steps. Call {@link * 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 {@link * #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.

* * * @since 1.2 * * @param context The {@link FacesContext} instance for the current request * @param state The serialized state information previously saved * @throws IOException if the state argument is not an array of length 2. * */ public void writeState(FacesContext context, Object state) throws IOException { SerializedView view; if (state instanceof SerializedView) { view = (SerializedView) state; } else { if (state instanceof Object[]) { Object[] stateArray = (Object[])state; if (2 == stateArray.length) { StateManager stateManager = context.getApplication().getStateManager(); view = stateManager.new SerializedView(stateArray[0], stateArray[1]); } else { //PENDING - I18N if (log.isLoggable(Level.SEVERE)) { log.log(Level.SEVERE, "State is not an expected array of length 2."); } throw new IOException("State is not an expected array of length 2."); } } else { //PENDING - I18N if (log.isLoggable(Level.SEVERE)) { log.log(Level.SEVERE, "State is not an expected array of length 2."); } throw new IOException("State is not an expected array of length 2."); } } writeState(context, view); } /** *

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

* *

If the {@link * javax.faces.application.StateManager.SerializedView} 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 {@link * javax.faces.application.StateManager#STATE_SAVING_METHOD_CLIENT}, * the implementation may encrypt the state to be saved to the * client. We recommend that the state be unreadable by the client, * and also be tamper evident. The reference implementation follows * these recommendations.

* * @deprecated This method has been replaced by {@link * #writeState(javax.faces.context.FacesContext,java.lang.Object)}. * The default implementation creates a two element * Object array with the first element being the return * from calling {@link SerializedView#getStructure}, and the second * being the return from {@link SerializedView#getState}. It then * passes this Object array to {@link #writeState}. * * @param context The {@link FacesContext} instance for the current request * @param state The serialized state information previously saved * */ public void writeState(FacesContext context, SerializedView state) throws IOException { if (state != null) { writeState(context, new Object[]{state.getStructure(), state.getState()}); } } /** *

If the preceding call to {@link #writeState(javax.faces.context.FacesContext, java.lang.Object)} * was stateless, return {@code true}. If the preceding call to {@code writeState()} was * stateful, return {@code false}. Otherwise throw {@code IllegalStateException}.

* *
* *

To preserve backward compatibility * with custom implementations that may have extended from an earlier * version of this class, an implementation is provided that returns * false. A compliant implementation must override this * method to take the specified action.

* *
* * @param context The {@link FacesContext} instance for the current request * @param viewId View identifier of the view to be restored * @throws NullPointerException if the argument {@code context} is {@code null}. * @throws IllegalStateException if this method is invoked and the statefulness * of the preceding call to {@link #writeState(javax.faces.context.FacesContext, java.lang.Object)} * cannot be determined. * * @since 2.2 * * */ public boolean isStateless(FacesContext context, String viewId) { return false; } /** *

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 {@link * #writeState(javax.faces.context.FacesContext,java.lang.Object)}.

* *

If the state saving method for this * application is {@link * 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 * {@link javax.faces.application.ProtectedViewException} must be thrown.

* *

For backwards compatability with existing * ResponseStateManager implementations, the default * implementation of this method calls {@link * #getTreeStructureToRestore} and {@link * #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.

* * @since 1.2 * * @param context The {@link FacesContext} instance for the current request * @param viewId View identifier of the view to be restored * * @return the tree structure and component state Object passed in * to writeState. If this is an initial request, this * method returns null. */ public Object getState(FacesContext context, String viewId) { Object stateArray[] = { getTreeStructureToRestore(context, viewId), getComponentStateToRestore(context) }; return stateArray; } /** *

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

* * @deprecated This method has been replaced by {@link #getState}. * The default implementation returns null. * * @param context The {@link FacesContext} instance for the current request * @param viewId View identifier of the view to be restored * */ public Object getTreeStructureToRestore(FacesContext context, String viewId) { return null; } /** *

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

* * @deprecated This method has been replaced by {@link #getState}. * The default implementation returns null. * * @param context The {@link FacesContext} instance for the current request * */ public Object getComponentStateToRestore(FacesContext context) { return null; } /** *

Return true if the current request is a postback. This method * is leveraged from the Restore View Phase to determine if * {@link javax.faces.application.ViewHandler#restoreView} or {@link * 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 {@link * 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 {@link #VIEW_STATE_PARAM}.

* *

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

* * @since 1.2 */ public boolean isPostback(FacesContext context) { return (!context.getExternalContext().getRequestParameterMap().isEmpty()); } /** *

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

* * @param context the {@link FacesContext} for the current request * @param state the state from which the String version will be generated * from * @return the view state for this request without any markup specifics * * @since 2.0 */ public String getViewState(FacesContext context, Object state) { return null; } /** *

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. *

* * @param context the {@link FacesContext} for the current request * * @return a cryptographically strong value * * @since 2.2 */ public String getCryptographicallyStrongTokenFromSession(FacesContext context) { return null; } }




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