source: trunk/gsdl3/src/java/org/greenstone/gsdl3/action/PageAction.java@ 6300

Last change on this file since 6300 was 6300, checked in by kjdon, 20 years ago

GSXML.createBasicRequest now expects a user id
  • Property svn:keywords set to Author Date Id Revision
File size: 8.2 KB
Line 
1package org.greenstone.gsdl3.action;
2
3import org.greenstone.gsdl3.core.ModuleInterface;
4import org.greenstone.gsdl3.util.*;
5// XML classes
6import org.w3c.dom.Node;
7import org.w3c.dom.NodeList;
8import org.w3c.dom.Document;
9import org.w3c.dom.Element;
10
11import java.util.HashMap;
12import java.io.File;
13
14public class PageAction extends Action {
15
16 public static final String HOME_PAGE = "home";
17 public static final String ABOUT_PAGE = "about";
18 public static final String PREFS_PAGE = "pref";
19 public Element process (Element message) {
20
21 Element request = (Element) GSXML.getChildByTagName(message, GSXML.REQUEST_ELEM);
22 // the page name is the subaction
23 String page_name = request.getAttribute(GSXML.SUBACTION_ATT);
24 if (page_name.equals("")) { // if no page specified, assume home page
25 page_name = HOME_PAGE;
26 }
27 Element result = this.doc.createElement(GSXML.MESSAGE_ELEM);
28 Element response;
29 if (page_name.equals(HOME_PAGE)) {
30 response = homePage(request);
31 } else if (page_name.equals(ABOUT_PAGE)) {
32 response = aboutPage(request);
33// } else if (page_name.equals(PREFS_PAGE)) {
34// response = prefsPage(request);
35 } else { // unknown page
36
37 System.err.println("PageAction Error: unknown page specified!");
38 response = unknownPage(request);
39 }
40
41 result.appendChild(this.doc.importNode(response, true));
42 ///ystem.out.println("page action result: "+this.converter.getPrettyString(result));
43 return result;
44 }
45
46
47 protected Element homePage(Element request) {
48
49 String lang = request.getAttribute(GSXML.LANG_ATT);
50 String uid = request.getAttribute(GSXML.USER_ID_ATT);
51 // first, get the message router info
52 Element coll_list_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
53 Element coll_list_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_DESCRIBE, "", lang, uid);
54 coll_list_message.appendChild(coll_list_request);
55 Element coll_list_response = (Element)this.mr.process(coll_list_message);
56 if (coll_list_response==null) {
57 System.err.println("PageAction Error: couldn't query the message router!");
58 return null;
59 }
60
61 // second, get the metadata for each collection - we only want specific
62 // elements but for now, we'll just get it all
63 NodeList colls = coll_list_response.getElementsByTagName(GSXML.COLLECTION_ELEM);
64 // we will send all the requests in a single message
65 Element metadata_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
66 for (int i=0; i<colls.getLength(); i++) {
67 Element c = (Element)colls.item(i);
68 String name = c.getAttribute(GSXML.NAME_ATT);
69
70 Element metadata_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_DESCRIBE, name, lang, uid);
71 metadata_message.appendChild(metadata_request);
72 }
73
74 Element metadata_response = (Element)this.mr.process(metadata_message);
75
76 NodeList coll_responses = metadata_response.getElementsByTagName(GSXML.RESPONSE_ELEM);
77 // check that have same number of responses as collections
78 if (colls.getLength() != coll_responses.getLength()) {
79 System.err.println("PageAction Error: didn't get a response for each collection - somethings gone wrong!");
80 // for now, dont use the metadata
81 } else {
82 for (int i=0; i<colls.getLength(); i++) {
83 Element c1 = (Element)colls.item(i);
84 Element c2 = (Element)coll_responses.item(i);
85 if (c1.getAttribute(GSXML.NAME_ATT).equals(c2.getAttribute(GSXML.FROM_ATT))) {
86 //add the collection data into the original response
87 GSXML.mergeElements(c1, (Element)GSXML.getChildByTagName(c2, GSXML.COLLECTION_ELEM));
88 } else {
89 System.err.println("PageAction Error: response does not correspond to request!");
90 }
91
92 }
93 }
94
95 //now the full response message is in coll_list_response
96 // return the response element
97 Element response = (Element) GSXML.getChildByTagName(coll_list_response, GSXML.RESPONSE_ELEM);
98 return response;
99
100 } // homePage
101
102 protected Element aboutPage(Element request) {
103
104 String lang = request.getAttribute(GSXML.LANG_ATT);
105 String uid = request.getAttribute(GSXML.USER_ID_ATT);
106 // extract the params from the cgi-request,
107 Element cgi_paramList = (Element)GSXML.getChildByTagName(request, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
108 HashMap params = GSXML.extractParams(cgi_paramList, false);
109
110 String coll_name = (String)params.get(GSParams.COLLECTION);
111 if (coll_name == null || coll_name.equals("")) {
112 System.err.println("PageAction Error: about page requested with no collection or cluster specified!");
113 // return an empty response
114 return this.doc.createElement(GSXML.RESPONSE_ELEM);
115 }
116
117 // get the collection or cluster description
118 Element coll_about_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
119
120 Element coll_about_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_DESCRIBE, coll_name, lang, uid);
121 coll_about_message.appendChild(coll_about_request);
122
123 Element coll_about_response = (Element)this.mr.process(coll_about_message);
124
125 if (coll_about_response == null) {
126 return null;
127 }
128
129 // second, get the info for each service - we only want display items
130 // but for now, we'll just get it all
131 NodeList services = coll_about_response.getElementsByTagName(GSXML.SERVICE_ELEM);
132 // we will send all the requests in a single message
133 Element info_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
134 for (int i=0; i<services.getLength(); i++) {
135 Element c = (Element)services.item(i);
136 String name = c.getAttribute(GSXML.NAME_ATT);
137 String address = GSPath.appendLink(coll_name, name);
138 Element info_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_DESCRIBE, address, lang, uid);
139 info_message.appendChild(info_request);
140 }
141
142 Element info_response = (Element)this.mr.process(info_message);
143
144 NodeList service_responses = info_response.getElementsByTagName(GSXML.RESPONSE_ELEM);
145 // check that have same number of responses as collections
146 if (services.getLength() != service_responses.getLength()) {
147 System.err.println("PageAction Error: didn't get a response for each service - somethings gone wrong!");
148 // for now, dont use the metadata
149 } else {
150 for (int i=0; i<services.getLength(); i++) {
151 Element c1 = (Element)services.item(i);
152 Element c2 = (Element)GSXML.getChildByTagName((Element)service_responses.item(i), GSXML.SERVICE_ELEM);
153 if (c1.getAttribute(GSXML.NAME_ATT).equals(c2.getAttribute(GSXML.NAME_ATT))) {
154 //add the service data into the original response
155 GSXML.mergeElements(c1, c2);
156 } else {
157 System.err.println("PageAction Error: response does not correspond to request!");
158 }
159
160 }
161 }
162
163 //now the full response message is in coll_list_response
164 // return the response element
165 Element response = (Element) GSXML.getChildByTagName(coll_about_response, GSXML.RESPONSE_ELEM);
166 return response;
167 }
168
169// protected Element prefsPage(Element request) {
170
171// return null;
172// }
173
174 /** if we dont know the page type, use this method */
175 protected Element unknownPage(Element request) {
176
177 String lang = request.getAttribute(GSXML.LANG_ATT);
178 String uid = request.getAttribute(GSXML.USER_ID_ATT);
179 String page_name = request.getAttribute(GSXML.SUBACTION_ATT);
180
181 // extract the params from the cgi-request,
182 Element cgi_paramList = (Element)GSXML.getChildByTagName(request, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
183 HashMap params = GSXML.extractParams(cgi_paramList, false);
184
185 String coll_name = (String)params.get(GSParams.COLLECTION);
186 if (coll_name == null || coll_name.equals("")) {
187 // just return an empty response
188 return this.doc.createElement(GSXML.RESPONSE_ELEM);
189 }
190
191 // else get the coll description - actually this is the same as for the about page - should we merge these two methods??
192
193 // if there is a service specified should we get the service description instead??
194 // get the collection or cluster description
195 Element coll_about_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
196
197 Element coll_about_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_DESCRIBE, coll_name, lang, uid);
198 coll_about_message.appendChild(coll_about_request);
199
200 Element coll_about_response = (Element)this.mr.process(coll_about_message);
201
202 // add the response to the page get teh response element and return it
203 Element response = (Element) GSXML.getChildByTagName(coll_about_response, GSXML.RESPONSE_ELEM);
204 return response;
205
206 }
207}
Note: See TracBrowser for help on using the repository browser.