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1
24 package org.riotfamily.website.template;
25
26 import java.io.IOException  ;
27 import java.util.HashMap ;
28 import java.util.Iterator ;
29 import java.util.List ;
30 import java.util.Map ;
31
32 import javax.servlet.ServletException ;
33 import javax.servlet.http.HttpServletRequest ;
34 import javax.servlet.http.HttpServletResponse ;
35
36 import org.apache.commons.logging.Log;
37 import org.apache.commons.logging.LogFactory;
38 import org.riotfamily.common.web.util.ServletUtils;
39 import org.riotfamily.website.interceptor.pushup.DeferredRenderingResponseWrapper;
40 import org.springframework.util.Assert;
41 import org.springframework.web.servlet.ModelAndView;
42
43
55 public class PushUpTemplateController extends TemplateController {
56
57 private static final Log log = LogFactory.getLog(
58 PushUpTemplateController.class);
59
60 private static final String RESPONSE_WRAPPERS_ATTRIBUTE =
61 PushUpTemplateController.class.getName() + ".responseWrappers";
62
63 protected static final String SLOT_TO_RENDER_PARAMETER = "slotToRender";
64
65 private List pushUpSlots;
66
67 public void setPushUpSlots(List pushUpSlots) {
68 this.pushUpSlots = pushUpSlots;
69 }
70
71 protected ModelAndView handleRequestInternal(HttpServletRequest request,
72 HttpServletResponse response) throws Exception {
73
74 String slotToRender = request.getParameter(SLOT_TO_RENDER_PARAMETER);
75 if (slotToRender != null) {
76 renderCapturedSlot(request, response, slotToRender);
77 return null;
78 }
79 handlePushUps(request, response);
80 return super.handleRequestInternal(request, response);
81 }
82
83 protected void handlePushUps(HttpServletRequest request,
84 HttpServletResponse response)
85 throws ServletException , IOException {
86
87 if (pushUpSlots != null && !pushUpSlots.isEmpty()) {
88 HashMap config = new HashMap ();
90 request.setAttribute(SLOTS_CONFIGURATION_ATTRIBUTE, config);
91 Iterator it = pushUpSlots.iterator();
92 while (it.hasNext()) {
93 String slot = (String ) it.next();
94 config.put(slot, getDeferredRenderingUrl(request, slot));
95 handlePushUp(request, response, slot);
96 }
97 }
98 }
99
100
105 protected String getDeferredRenderingUrl(HttpServletRequest request,
106 String slot) {
107
108 StringBuffer url = new StringBuffer ()
109 .append(ServletUtils.getPathWithinApplication(request))
110 .append('?').append(SLOT_TO_RENDER_PARAMETER).append('=')
111 .append(slot);
112
113 return url.toString();
114 }
115
116 protected final Map getResponseWrappers(HttpServletRequest request) {
117 Map wrappers = (Map ) request.getAttribute(RESPONSE_WRAPPERS_ATTRIBUTE);
118 if (wrappers == null) {
119 wrappers = new HashMap ();
120 request.setAttribute(RESPONSE_WRAPPERS_ATTRIBUTE, wrappers);
121 }
122 return wrappers;
123 }
124
125 protected void handlePushUp(HttpServletRequest request,
126 HttpServletResponse response, String slot)
127 throws ServletException , IOException {
128
129 DeferredRenderingResponseWrapper responseWrapper =
130 new DeferredRenderingResponseWrapper(response);
131
132 getResponseWrappers(request).put(slot, responseWrapper);
133 request.setAttribute(SLOT_PATH_ATTRIBUTE, slot);
134
135 String url = (String ) getMergedConfiguration().get(slot);
136
137 log.debug("Capturing pushed-up slot " + slot + " [" + url + "]");
138 request.getRequestDispatcher(url).forward(
139 request, responseWrapper);
140 }
141
142
145 protected void renderCapturedSlot(HttpServletRequest request,
146 HttpServletResponse response, String slot) throws IOException {
147
148 log.debug("Rendering captured slot: " + slot);
149 DeferredRenderingResponseWrapper responseWrapper =
150 (DeferredRenderingResponseWrapper)
151 getResponseWrappers(request).get(slot);
152
153 Assert.notNull(responseWrapper,
154 "No wrapped response found for slot: " + slot);
155
156 responseWrapper.renderResponse(response);
157 }
158 }
159 |
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