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/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.faces.lifecycle;
import java.util.Map;
import jakarta.faces.context.FacesContext;
import jakarta.faces.render.ResponseStateManager;
/**
*
* This class represents a client window, which may be a browser tab, browser window, browser pop-up, portlet, or
* anything else that can display a {@link jakarta.faces.component.UIComponent} hierarchy rooted at a
* {@link jakarta.faces.component.UIViewRoot}.
*
*
*
*
*
* Modes of Operation
*
*
*
*
*
* none mode
*
*
*
* The generation of ClientWindow is controlled by the value of the context-param named by the
* value of {@link #CLIENT_WINDOW_MODE_PARAM_NAME}. If this context-param is not specified, or its value is
* "none", no ClientWindow instances will be generated, and the entire feature is effectively disabled for
* the entire application.
*
*
*
* Other modes
*
*
*
* To accomadate the widest possible range of implementation choices to support this feature, explicit names for modes
* other than "none" and "url" are not specified. However, for all values of {@link #CLIENT_WINDOW_MODE_PARAM_NAME}, the
* lifetime of a ClientWindow starts on the first request made by a particular client window (or tab, or
* pop-up, etc) to the Jakarta Faces runtime and persists as long as that window remains open or the session
* expires, whichever comes first. A client window is always associated with exactly one UIViewRoot
* instance at a time, but may display many different UIViewRoots during its lifetime.
*
*
*
* The ClientWindow instance is associated with the incoming request during the
* {@link Lifecycle#attachWindow} method. This method will cause a new instance of ClientWindow to be
* created, assigned an id, and passed to {@link jakarta.faces.context.ExternalContext#setClientWindow}.
*
*
*
* During state saving, regardless of the window id mode, or state saving mode, for ajax and non-ajax requests, a hidden
* field must be written whose name, id and value are given as specified in
* {@link jakarta.faces.render.ResponseStateManager#CLIENT_WINDOW_PARAM}.
*
*
*
* In addition to the hidden field already described. The runtime must ensure that any component that renders a
* hyperlink that causes the user agent to send a GET request to the Faces server when it is clicked has a query
* parameter with a name and value specified in {@link ResponseStateManager#CLIENT_WINDOW_URL_PARAM}. This requirement
* is met by several of the "encode" methods on {@link jakarta.faces.context.ExternalContext}. See
* {@link jakarta.faces.context.ExternalContext#encodeActionURL(java.lang.String) } for details.
*
*
*
*
*
*
* @since 2.2
*
*/
public abstract class ClientWindow {
/**
*
* The context-param that controls the operation of the ClientWindow feature. The runtime must support the
* values "none" and "url", without the quotes, but other values are possible. If not specified, or the value is not
* understood by the implementation, "none" is assumed.
*
*
* @since 2.2
*/
public static final String CLIENT_WINDOW_MODE_PARAM_NAME = "jakarta.faces.CLIENT_WINDOW_MODE";
/**
*
* Indicate the max number of ClientWindows, which is used by {@link ClientWindowScoped}.
* It is only active when jakarta.faces.CLIENT_WINDOW_MODE is enabled.
*
*
* @since 4.0
*/
public static final String NUMBER_OF_CLIENT_WINDOWS_PARAM_NAME = "jakarta.faces.NUMBER_OF_CLIENT_WINDOWS";
/**
*
* This method will be called whenever a URL is generated by the runtime where client window related parameters need to
* be inserted into the URL. This guarantees custom {@code ClientWindow} implementations that they will have the
* opportunity to insert any additional client window specific information in any case where a URL is generated, such as
* the rendering of hyperlinks. The returned map must be immutable. The default implementation of this method returns
* the empty map.
*
*
*
* @since 2.2
* @param context the {@code FacesContext} for this request.
* @return {@code null} or a map of parameters to insert into the URL query string.
*/
public abstract Map getQueryURLParameters(FacesContext context);
/**
*
* Return a String value that uniquely identifies this ClientWindow within the scope of the current
* session. See {@link #decode} for the specification of how to derive this value.
*
*
* @since 2.2
*
* @return the id of the {@code ClientWindow}
*/
public abstract String getId();
/**
*
* The implementation is responsible for examining the incoming request and extracting the value that must be returned
* from the {@link #getId} method. If {@link #CLIENT_WINDOW_MODE_PARAM_NAME} is "none" this method must not be invoked.
* If {@link #CLIENT_WINDOW_MODE_PARAM_NAME} is "url" the implementation must first look for a request parameter under
* the name given by the value of {@link jakarta.faces.render.ResponseStateManager#CLIENT_WINDOW_PARAM}. If no value is
* found, look for a request parameter under the name given by the value of
* {@link jakarta.faces.render.ResponseStateManager#CLIENT_WINDOW_URL_PARAM}. If no value is found, fabricate an id that
* uniquely identifies this ClientWindow within the scope of the current session. This value must be made
* available to return from the {@link #getId} method. The value must be suitable for inclusion as a hidden field or
* query parameter. If a value is found, decrypt it using the key from the session and make it available for return from
* {@link #getId}.
*
*
* @param context the {@link FacesContext} for this request.
*
* @since 2.2
*/
public abstract void decode(FacesContext context);
private static final String PER_USE_CLIENT_WINDOW_URL_QUERY_PARAMETER_DISABLED_KEY = "jakarta.faces.lifecycle.ClientWindowRenderModeEnablement";
/**
*
* Components that permit per-use disabling of the appending of the ClientWindow in generated URLs must call this method
* first before rendering those URLs. The caller must call
* {@link #enableClientWindowRenderMode(jakarta.faces.context.FacesContext)} from a finally block after
* rendering the URL. If {@link #CLIENT_WINDOW_MODE_PARAM_NAME} is "url" without the quotes, all generated URLs that
* cause a GET request must append the ClientWindow by default. This is specified as a static method because callsites
* need to access it without having access to an actual {@code ClientWindow} instance.
*
*
* @param context the {@link FacesContext} for this request.
*
* @since 2.2
*/
public void disableClientWindowRenderMode(FacesContext context) {
Map attrMap = context.getAttributes();
attrMap.put(PER_USE_CLIENT_WINDOW_URL_QUERY_PARAMETER_DISABLED_KEY, Boolean.TRUE);
}
/**
*
* Components that permit per-use disabling of the appending of the ClientWindow in generated URLs must call this method
* first after rendering those URLs. If {@link #CLIENT_WINDOW_MODE_PARAM_NAME} is "url" without the quotes, all
* generated URLs that cause a GET request must append the ClientWindow by default. This is specified as a static method
* because callsites need to access it without having access to an actual {@code ClientWindow} instance.
*
*
* @param context the {@link FacesContext} for this request.
*
* @since 2.2
*/
public void enableClientWindowRenderMode(FacesContext context) {
Map attrMap = context.getAttributes();
attrMap.remove(PER_USE_CLIENT_WINDOW_URL_QUERY_PARAMETER_DISABLED_KEY);
}
/**
*
* Methods that append the ClientWindow to generated URLs must call this method to see if they are permitted to do so.
* If {@link #CLIENT_WINDOW_MODE_PARAM_NAME} is "url" without the quotes, all generated URLs that cause a GET request
* must append the ClientWindow by default. This is specified as a static method because callsites need to access it
* without having access to an actual {@code ClientWindow} instance.
*
*
* @param context the {@link FacesContext} for this request.
*
* @return the result as specified above
*
* @since 2.2
*/
public boolean isClientWindowRenderModeEnabled(FacesContext context) {
boolean result = false;
Map attrMap = context.getAttributes();
result = !attrMap.containsKey(PER_USE_CLIENT_WINDOW_URL_QUERY_PARAMETER_DISABLED_KEY);
return result;
}
}