|
1
24 package org.riotfamily.components.context;
25
26 import javax.servlet.http.HttpServletRequest  ;
27 import javax.servlet.http.HttpSession ;
28
29 import org.apache.commons.logging.Log;
30 import org.apache.commons.logging.LogFactory;
31 import org.riotfamily.common.web.util.ServletUtils;
32
33 public final class PageRequestUtils {
34
35 private static final String CONTEXT_MAP_ATTRIBUTE =
36 PageRequestUtils.class.getName() + ".contextMap";
37
38 private static Log log = LogFactory.getLog(PageRequestUtils.class);
39
40 private PageRequestUtils() {
41 }
42
43 public static boolean isPartialRequest(HttpServletRequest request) {
44 return PartialPageRequest.isWrapped(request);
45 }
46
47 public static boolean createAndStoreContext(HttpServletRequest request,
48 Object contextKey, int timeToLive) {
49
50 PageRequestContext context = createContext(request, contextKey);
51 if (context != null) {
52 storeContext(context, request, timeToLive);
53 return true;
54 }
55 return false;
56 }
57
58 public static PageRequestContext createContext(HttpServletRequest request,
59 Object contextKey) {
60
61 if (PartialPageRequest.isWrapped(request, contextKey)) {
62 log.debug("Request is already wrapped - ignoring it ...");
63 return null;
64 }
65 return new PageRequestContext(contextKey, request);
66 }
67
68 public static void storeContext(PageRequestContext context,
69 HttpServletRequest request, int timeToLive) {
70
71 String uri = ServletUtils.getOriginatingRequestUri(request);
72 log.debug("Storing context for " + uri + "#" + context.getKey());
73 ContextMap contextMap = getContextMap(request);
74 contextMap.put(uri, context.getKey(), context, timeToLive);
75 }
76
77 public static void touchContext(HttpServletRequest request, String pageUri) {
78 ContextMap contextMap = getContextMap(request);
79 contextMap.touch(pageUri);
80 contextMap.removeExpiredContexts();
81 }
82
83 public static PageRequestContext getContext(HttpServletRequest request,
84 String pageUri, Object contextKey) {
85
86 ContextMap contexts = getContextMap(request);
87 return contexts.get(pageUri, contextKey);
88 }
89
90 public static HttpServletRequest wrapRequest(
91 HttpServletRequest request, String pageUri, Object contextKey)
92 throws RequestContextExpiredException {
93
94 log.debug("Wrapping context for key " + contextKey);
95 ContextMap contexts = getContextMap(request);
96 PageRequestContext context = contexts.get(pageUri, contextKey);
97 if (context == null) {
98 throw new RequestContextExpiredException();
99 }
100 return new PartialPageRequest(request, context);
101 }
102
103 private static ContextMap getContextMap(HttpServletRequest request) {
104 HttpSession session = request.getSession();
105 ContextMap contextMap = (ContextMap) session.getAttribute(
106 CONTEXT_MAP_ATTRIBUTE);
107
108 if (contextMap == null) {
109 contextMap = new ContextMap();
110 session.setAttribute(CONTEXT_MAP_ATTRIBUTE, contextMap);
111 }
112 return contextMap;
113 }
114
115 }
116 |
Popular Tags |
Java API By Example, From Geeks To Geeks.