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1
26
28 package de.nava.informa.parsers;
29
30 import java.net.URL  ;
31 import java.util.Date ;
32 import java.util.Iterator ;
33 import java.util.List ;
34
35 import org.apache.commons.logging.Log;
36 import org.apache.commons.logging.LogFactory;
37 import org.jdom.Element;
38 import org.jdom.Namespace;
39
40 import de.nava.informa.core.ChannelBuilderIF;
41 import de.nava.informa.core.ChannelFormat;
42 import de.nava.informa.core.ChannelIF;
43 import de.nava.informa.core.ItemIF;
44 import de.nava.informa.core.ParseException;
45 import de.nava.informa.utils.ParserUtils;
46
47
54 class Atom_0_3_Parser {
55
56 private static Log logger = LogFactory.getLog(Atom_0_3_Parser.class);
57
58 static ChannelIF parse(ChannelBuilderIF cBuilder, Element channel)
59 throws ParseException {
60 if (cBuilder == null) {
61 throw new RuntimeException (
62 "Without builder no channel can " + "be created.");
63 }
64 Date dateParsed = new Date ();
65 Namespace defNS = ParserUtils.getDefaultNS(channel);
66 if (defNS == null) {
67 defNS = Namespace.NO_NAMESPACE;
68 logger.info("No default namespace found.");
69 }
70 Namespace dcNS = ParserUtils.getNamespace(channel, "dc");
72 if (dcNS == null) {
73 logger.debug("No namespace for dublin core found");
74 dcNS = defNS;
75 }
76
77 logger.debug("start parsing.");
78
79 String formatVersion = "0.3";
81 if (channel.getAttribute("version") != null) {
82 formatVersion = channel.getAttribute("version").getValue().trim();
83 logger.debug("Atom version " + formatVersion + " specified in document.");
84 } else {
85 logger.info("No format version specified, using default.");
86 }
87
88
90 ChannelIF chnl =
92 cBuilder.createChannel(channel, channel.getChildTextTrim("title", defNS));
93
95 chnl.setFormat(ChannelFormat.ATOM_0_3);
96
97 String language = channel.getAttributeValue("lang",Namespace.XML_NAMESPACE);
99 if (language != null) {
100 chnl.setLanguage( language );
101 }
102
103 if (channel.getChild("description") != null) {
105 chnl.setDescription(channel.getChildTextTrim("description", defNS));
106 } else {
107 chnl.setDescription(channel.getChildTextTrim("tagline", defNS));
109 }
110
111 Element ttl = channel.getChild("ttl", dcNS);
113 if (ttl != null) {
114 String ttlString = ttl.getTextTrim();
115 if ( ttlString!= null) {
116 chnl.setTtl( Integer.parseInt(ttlString));
117 }
118 }
119
120 Element modified = channel.getChild("modified", defNS);
122 if (modified != null) {
123 chnl.setPubDate(ParserUtils.getDate(modified.getTextTrim()));
124 }
125
126
133
134 Element author = channel.getChild("author", defNS);
136 if (author != null) {
137 chnl.setCreator(author.getChildTextTrim("name", defNS));
138 }
139
140 Element generator = channel.getChild("generator", defNS);
142 if (generator != null) {
143 chnl.setGenerator(generator.getTextTrim());
144 }
145
146 Element copyright = channel.getChild("copyright", defNS);
148 if (copyright != null) {
149 chnl.setCopyright(getValue(copyright));
150 }
151
152 List links = channel.getChildren("link", defNS);
155 Iterator i = links.iterator();
156 while (i.hasNext()) {
157 Element linkElement = (Element) i.next();
158 String rel = linkElement.getAttributeValue("rel");
160 String href = linkElement.getAttributeValue("href");
161 if (rel != null && href != null && rel.equals("alternate")) {
162 URL linkURL = ParserUtils.getURL(href);
163 chnl.setSite(linkURL);
164 break;
165 }
166
167 }
169
170 List items = channel.getChildren("entry", defNS);
172 i = items.iterator();
173 while (i.hasNext()) {
174 Element item = (Element) i.next();
175
176 Element elTitle = item.getChild("title", defNS);
179 String strTitle = "<No Title>";
180 if (elTitle != null) {
181 strTitle = getValue( elTitle );
182 logger.debug("Parsing title "+elTitle.getTextTrim()+"->"+strTitle);
183 }
184 if (logger.isDebugEnabled()) {
185 logger.debug("Entry element found (" + strTitle + ").");
186 }
187 Element elLink = item.getChild("link", defNS);
190 String strLink = "";
191 if (elLink != null) {
192 strLink = elLink.getAttributeValue("href").trim();
193 }
194 logger.info("url read : "+strLink+" ,"+elLink.getAttributeValue("rel"));
196
197 Element elDesc = item.getChild("summary", defNS);
199 String strDesc = "";
200 if (elDesc != null) {
201 strDesc = getValue(elDesc); }
203
205 ItemIF curItem = cBuilder.createItem(item, chnl, strTitle, strDesc,
207 ParserUtils.getURL(strLink));
208 curItem.setFound(dateParsed);
209
210 Element elIssued = item.getChild("issued", defNS);
212 curItem.setDate(ParserUtils.getDate(elIssued.getTextTrim()));
213
214 Element elSubject = item.getChild("subject", dcNS);
216 if (elSubject != null) {
217 curItem.setSubject(elSubject.getTextTrim());
219 }
220 }
221
222 chnl.setLastUpdated(dateParsed);
224
225 return chnl;
226 }
227
228 private static String getValue(Element elt) {
229 if (elt == null)
230 return "";
231 String typeElt = elt.getAttributeValue("type");
232 String modeElt = elt.getAttributeValue("mode");
233 String value;
234 String unescapedValue = elt.getTextTrim();
235
236 if( unescapedValue==null || unescapedValue.length()==0) {
237 java.util.List listContent = elt.getContent();
239 Iterator iter = listContent.iterator();
240 while ( iter.hasNext() ) {
241 org.jdom.Content content = (org.jdom.Content) iter.next();
242 logger.debug("getValue : element read = "+ content);
243 if (content instanceof Element) {
244 unescapedValue = ((Element)content).getValue();
245 logger.debug("elt found in type :"+unescapedValue);
246 }
247 }
248 }
249 value = unescapedValue;
250 if ("base64".equals(modeElt)) {
251 value = ParserUtils.decodeBase64(value);
252 }
253 if ("text/html".equals(typeElt) || "application/xhtml+xml".equals(typeElt)) {
254 value = ParserUtils.unEscape(value);
255 }
256
257 return value;
258 }
259
260 }
261 |
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