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package javax.faces.lifecycle;
import java.util.Map;
import javax.faces.context.FacesContext;
import javax.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
* javax.faces.component.UIComponent} hierarchy rooted at a {@link
* javax.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"
* 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 JSF 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
* javax.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
* javax.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
* javax.faces.context.ExternalContext}. See {@link
* javax.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, "none" is assumed.
*
* @since 2.2
*/
public static final String CLIENT_WINDOW_MODE_PARAM_NAME =
"javax.faces.CLIENT_WINDOW_MODE";
/**
* 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 default implementation of this method returns
* the {@code null}.
*
*
* @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
*/
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 javax.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 javax.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 encrypted with a key stored in the http session and 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 =
"javax.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(javax.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 static 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 static 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.
*
* @since 2.2
*/
public static 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;
}
}