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package com.sun.faces.util;
import java.util.Map;
import java.util.HashMap;
import javax.faces.context.FacesContext;
import com.sun.faces.RIConstants;
/**
*
* This helper class is used to reduced the number of per-request state
* variables we store in the request.
*
*
*
* Mojarra stores several request scoped attributes during its processing.
* Each time an attribute is added or removed, the action of doing so results
* in the ServletRequestAttributeListener Mojarra uses for ManagedBean tracking
* to be triggered. Additionally, any other ServletRequestAttributeListeners
* will be invoked. Since these attributes are, for all intents and purposes,
* private, reducing the footprint of their usage is ideal.
*
*
*
* To that end, this class should be used to for all interactions with implementation
* specific request scoped attributes. By using this class, all attributes
* needed by the implementation will be stored within a Map within the the request,
* so that we only trigger one ServletRequestAttributeListener event per request (
* that one event will be the first time we add the Map to the request).
*
*
* @since 1.2_08
*/
public class RequestStateManager {
/**
* Attribute for storing any content within a page that is defined
* after the closing f:view.
*/
public static final String AFTER_VIEW_CONTENT =
RIConstants.FACES_PREFIX + "AFTER_VIEW_CONTENT";
/**
* Attribute describing the current ELResolver chain type (either JSP
* or Faces)
*/
public static final String EL_RESOLVER_CHAIN_TYPE_NAME =
RIConstants.FACES_PREFIX + "ELResolverChainType";
/**
* Attribute indicating the current component being processed.
* This will be used when generating bytecode for custom converters.
*/
public static final String TARGET_COMPONENT_ATTRIBUTE_NAME =
RIConstants.FACES_PREFIX + "ComponentForValue";
/**
* Attribute to lookup the ExternalContextImpl. This is used by the
* API to delegate to when a 1.1 ExternalContext implementation decorates
* the 1.2 implementation.
*/
public static final String EXTERNALCONTEXT_IMPL_ATTR_NAME =
RIConstants.FACES_PREFIX + "ExternalContextImpl";
/**
* Attribute to lookup the FacesContextImpl. This is used by the
* API to delegate to when a 1.1 ExternalContext implementation decorates
* the 1.2 implementation.
*/
public static final String FACESCONTEXT_IMPL_ATTR_NAME =
RIConstants.FACES_PREFIX + "FacesContextImpl";
/**
* Attribute defining the {@link javax.faces.render.RenderKit} being used
* for this request. Storing it in the request reduces the overhead of
* querying the RenderKitFactory multiple times.
*/
public static final String RENDER_KIT_IMPL_REQ =
RIConstants.FACES_PREFIX + "renderKitImplForRequest";
/**
* Attribute containing a Set of clientIds that have messages
* pending display when rendering response. Any messages that haven't
* been displayed will be written to the log.
*/
public static final String CLIENT_ID_MESSAGES_NOT_DISPLAYED =
RIConstants.FACES_PREFIX + "clientIdMessagesNotDisplayed";
/**
* This attribute is used by the StateMangaer during restore view.
* The values are stored in the request for later use.
*/
public static final String LOGICAL_VIEW_MAP =
RIConstants.FACES_PREFIX + "logicalViewMap";
/**
* This attribute is used by the StateMangaer during restore view.
* The values are stored in the request for later use.
*/
public static final String ACTUAL_VIEW_MAP =
RIConstants.FACES_PREFIX + "actualViewMap";
/**
* This attribute is used by the loadBundle tag for tracking views/subviews
* within the logical view (this is only used when 1.1 compatibility is
* enabled).
*/
public static final String VIEWTAG_STACK_ATTR_NAME =
RIConstants.FACES_PREFIX + "taglib.jsf_core.VIEWTAG_STACK";
/**
* Attribute to store the {@link javax.faces.webapp.FacesServlet} path of
* the original request.
*/
public static final String INVOCATION_PATH =
RIConstants.FACES_PREFIX + "INVOCATION_PATH";
/**
* This attribute protects against infinite loops on expressions that
* touch a custom legacy VariableResolver that delegates to its parent
* VariableResolver.
*/
public static final String REENTRANT_GUARD =
RIConstants.FACES_PREFIX + "LegacyVariableResolver";
/**
* Leveraged by the RequestStateManager to allow deprecated ResponseStateManager
* methods to continue to work if called.
*/
public static final String FACES_VIEW_STATE =
"com.sun.faces.FACES_VIEW_STATE";
/**
* Leveraged by the RequestStateManager to allow deprecated ResponseStateManager
* methods to continue to work if called.
*/
public static final String FACES_VIEW_STRUCTURE =
"com.sun.faces.FACES_VIEW_STRUCTURE";
/**
* The key under with the Map containing the implementation specific
* attributes will be stored within the request.
*/
private static final String KEY =
RequestStateManager.class.getName();
// ---------------------------------------------------------- Public Methods
/**
* @param ctx the FacesContext for the current request
* @param key the key for the value
* @return the value associated with the specified key.
*/
public static Object get(FacesContext ctx, String key) {
if (ctx == null || key == null) {
return null;
}
Map reqState = getStateMap(ctx);
return reqState.get(key);
}
/**
*
* Adds the specified key and value to the Map stored in the request.
* If value is null, that key/value pair will
* be removed from the Map.
*
*
* @param ctx the FacesContext for the current request
* @param key the key for the value
* @param value the value to store
*/
public static void set(FacesContext ctx, String key, Object value) {
if (ctx == null || key == null) {
return;
}
if (value == null) {
remove(ctx, key);
}
Map reqState = getStateMap(ctx);
reqState.put(key, value);
}
/**
*
* Remove the value associated with the specified key.
*
*
* @param ctx the FacesContext for the current request
* @param key the key for the value
* @return the value previous associated with the specified key, if any
*/
public static Object remove(FacesContext ctx, String key) {
if (ctx == null || key == null) {
return null;
}
Map reqState = getStateMap(ctx);
return reqState.remove(key);
}
/**
* @param ctx the FacesContext for the current request
* @param key the key for the value
* @return true if the specified key exists in the Map
*/
public static boolean containsKey(FacesContext ctx, String key) {
if (ctx == null || key == null) {
return false;
}
Map reqState = getStateMap(ctx);
return reqState.containsKey(key);
}
// --------------------------------------------------------- Private Methods
/**
* @param ctx the FacesContext for the current request
* @return the Map from the request containing the implementation specific
* attributes needed for processing
*/
public static Map getStateMap(FacesContext ctx) {
assert (ctx != null); // all callers guard against a null context
Map requestMap = ctx.getExternalContext().getRequestMap();
//noinspection unchecked
Map reqState = null;
if (!requestMap.isEmpty()) {
reqState = (Map) requestMap.get(KEY);
}
if (reqState == null) {
reqState = new HashMap();
requestMap.put(KEY, reqState);
}
return reqState;
}
}