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1
37 package net.sourceforge.cruisecontrol.publishers.rss;
38
39 import java.io.BufferedWriter  ;
40 import java.io.File ;
41 import java.io.IOException ;
42 import java.io.Writer ;
43
44 import java.util.ArrayList ;
45 import java.util.Collections ;
46 import java.util.List ;
47
48 import org.jdom.Document;
49 import org.jdom.Element;
50 import org.jdom.JDOMException;
51 import org.jdom.input.SAXBuilder;
52
53 import org.apache.log4j.Logger;
54
55
62 public class Feed {
63
64 private static final Logger LOG = Logger.getLogger(Feed.class);
65
66 private String channelTitle;
67 private String channelLink;
68 private String channelDescription;
69 private String channelLanguage = "en-US";
70
71 private int maxLength = 20;
72 private final List items = new ArrayList ();
73
74
79 public Feed(File publishToFile) {
80
81 if (publishToFile.exists() && publishToFile.canRead()) {
83 try {
84
85 SAXBuilder builder = new SAXBuilder();
86 Document doc = builder.build(publishToFile);
87
88 if (doc.getRootElement() != null
89 && doc.getRootElement().getChild(RSS.NODE_CHANNEL) != null) {
90
91 Element channelElement = doc.getRootElement().getChild(RSS.NODE_CHANNEL);
92 if (channelElement.getChild(RSS.NODE_CHANNEL_TITLE) != null) {
93 this.channelTitle =
94 channelElement.getChild(RSS.NODE_CHANNEL_TITLE).getText().trim();
95 }
96 if (channelElement.getChild(RSS.NODE_CHANNEL_LINK) != null) {
97 this.channelLink =
98 channelElement.getChild(RSS.NODE_CHANNEL_LINK).getText().trim();
99 }
100 if (channelElement.getChild(RSS.NODE_CHANNEL_DESCRIPTION) != null) {
101 this.channelDescription =
102 channelElement.getChild(RSS.NODE_CHANNEL_DESCRIPTION).getText().trim();
103 }
104
105 if (channelElement.getChildren(RSS.NODE_ITEM) != null) {
106 List itemNodes = channelElement.getChildren(RSS.NODE_ITEM);
107 for (int i = 0; i < itemNodes.size(); i++) {
108 this.items.add(new Item((Element) itemNodes.get(i)));
109 }
110 }
111 } else {
112 LOG.info("existing RSS file doesn't appear to be valid. Missnig root element or channel node.");
113 }
114
115 Collections.sort(this.items);
117 while (this.items.size() > this.maxLength) {
118 this.items.remove(this.items.size() - 1);
119 }
120 } catch (JDOMException jex) {
121 LOG.error("jdom exception while parsing existing RSS file " + publishToFile.getPath()
122 + "; deleting file and starting over...", jex);
123 publishToFile.delete();
124 } catch (IOException ioe) {
125 LOG.error("IOException while reading existing RSS file " + publishToFile.getPath()
126 + "; deleting file and starting over...", ioe);
127 publishToFile.delete();
128 }
129 } else {
130 LOG.info("Unable to locate or read the existing RSS feed file.");
131 }
132 }
133
134
135
136
142 public void setTitle(String title) {
143 this.channelTitle = title;
144 }
145
146
152 public String getTitle() {
153 return this.channelTitle;
154 }
155 public void setLink(String link) {
156 this.channelLink = link;
157 }
158 public String getLink() {
159 return this.channelLink;
160 }
161 public void setDescription(String description) {
162 this.channelDescription = description;
163 }
164 public String getDescription() {
165 return this.channelDescription;
166 }
167
168 public void setMaxLength(int max) {
169 this.maxLength = max;
170 }
171 public int getMaxLength() {
172 return this.maxLength;
173 }
174
175 public void addItem(Item item) {
176 synchronized (this.items) {
177 if (this.items.size() == this.maxLength) {
178 this.items.remove(this.items.size() - 1);
179 }
180 this.items.add(0, item);
181 }
182 }
183
184 public List getItems() {
185 return this.items;
186 }
187
188 public void write(Writer wr) throws IOException {
189
190 BufferedWriter br = new BufferedWriter (wr);
191 br.write("<?xml version=\"1.0\" ?>\n");
192 br.write("<rss version=\"2.0\">\n");
193 br.write(" <channel>\n");
194 br.write(" <title>");
195 if (this.getTitle() != null) {
196 br.write(this.getTitle());
197 }
198 br.write("</title>\n");
199 br.write(" <link>");
200 if (this.getLink() != null) {
201 br.write(this.getLink());
202 }
203 br.write("</link>\n");
204 br.write(" <description>");
205 if (this.getDescription() != null) {
206 br.write(this.getDescription());
207 }
208 br.write("</description>\n");
209 br.write(" <language>");
210 br.write(this.channelLanguage);
211 br.write("</language>\n");
212
213 for (int i = 0; i < this.items.size(); i++) {
214 if (this.items.get(i) != null) {
216 Item item = (Item) this.items.get(i);
217 br.write(item.toXml());
218 }
219 }
220 br.write(" </channel>\n");
221 br.write("</rss>\n");
222 br.flush();
223 }
224 }
225 |
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