|
1
5 package org.exoplatform.portlets.rss.component;
6
7 import java.util.Vector  ;
8
9 import javax.xml.parsers.DocumentBuilder ;
10 import javax.xml.parsers.DocumentBuilderFactory ;
11
12 import org.w3c.dom.Document ;
13 import org.w3c.dom.Node ;
14 import org.w3c.dom.NodeList ;
15
16
17
24 public class Channel {
25 private String title_ ;
26 private String description_ ;
27 private String link_ ;
28 private String imageSrc_ ;
29 private Item[] items_ ;
30 private long updateTime_ ;
31
32 public Channel() {
33 }
34
35 public String getTitle() { return title_ ; }
36 public void setTitle(String title) { title_ = title ; }
37
38 public String getLink() { return link_ ; }
39 public void setLink(String link) { link_ = link ; }
40
41 public String getDescription() { return description_ ; }
42 public void setDescription(String desc) {description_ = desc ; }
43
44 public String getImageSrc() { return imageSrc_ ; }
45 public void setImageSrc(String src) { imageSrc_ = src ; }
46
47 public Item[] getItems() { return items_ ; }
48 public void setItems(Item[] items) { items_ = items ; }
49
50 public long getUpdateTime() { return updateTime_ ; }
51 public void setUpdateTime(long time) { updateTime_ = time; }
52
53 static public Channel parse(String url) throws Exception {
54 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
55 factory.setIgnoringComments(true);
56 factory.setCoalescing(true);
57 factory.setNamespaceAware(false);
58 factory.setValidating(false);
59 DocumentBuilder parser = factory.newDocumentBuilder();
60 Document document = parser.parse(url);
61 Channel channel = new Channel() ;
62 setChannelInfo(channel, document) ;
63 setItems(channel, document) ;
64 channel.setUpdateTime(System.currentTimeMillis()) ;
65 return channel ;
66 }
67
68
69 static private void setChannelInfo(Channel channelObj, Document doc) throws Exception {
70 NodeList list = doc.getElementsByTagName("channel");
71 if (list.getLength() > 0) {
72 Node channel = list.item(0);
73 list = channel.getChildNodes();
74 for (int i = 0; i < list.getLength(); ++i) {
75 Node node = list.item(i);
76 String nodeName = node.getNodeName() ;
77 if ("title".equals(nodeName)) {
78 channelObj.setTitle(node.getFirstChild().getNodeValue());
79 } else if ("link".equals(nodeName)) {
80 channelObj.setLink(node.getFirstChild().getNodeValue());
81 } else if ("description".equals(nodeName)) {
82 channelObj.setDescription(node.getFirstChild().getNodeValue());
83 }
84 }
85 }
86 }
87
88 static private void setItems(Channel channelObj, Document doc) throws Exception {
89 String root = doc.getDocumentElement().getTagName();
90 Item[] items = null ;
91 if (root.equals("rdf:RDF")) {
92 NodeList list = doc.getElementsByTagName("item");
93 items = getItems(list);
94 } else if (root.equals("rss")) {
95 NodeList list = doc.getElementsByTagName("channel");
96 if (list.getLength() != 1) {
97 items = new Item[0];
98 } else {
99 Node channel = list.item(0);
100 items = getItems(channel.getChildNodes());
101 }
102 } else if (root.equals("xml")) {
103 NodeList list = doc.getElementsByTagName("item");
104 items = getItems(list);
105 } else {
106 items = new Item[0];
107 }
108 channelObj.setItems(items) ;
109 }
110
111 static private Item[] getItems(NodeList items) throws Exception {
112 Vector v = new Vector ();
113 for (int i = 0; i < items.getLength(); ++i) {
114 Node node = items.item(i);
115 if (node.getNodeName().equals("item") == false) {
116 continue;
117 }
118 NodeList itemChildren = node.getChildNodes();
119 Item item = new Item() ;
120 for (int j = 0; j < itemChildren.getLength(); ++j) {
121 Node child = itemChildren.item(j);
122 String nodeName = child.getNodeName() ;
123 if (nodeName.equals("title")) {
124 if (child.getFirstChild() != null)
125 item.setTitle(child.getFirstChild().getNodeValue());
126 }
127 if (nodeName.equals("link")) {
128 if (child.getFirstChild() != null)
129 item.setLink(child.getFirstChild().getNodeValue());
130 }
131 if (nodeName.equals("description")) {
132 if (child.getFirstChild() != null) {
133 item.setDescription(child.getFirstChild().getNodeValue());
134 }
135 }
136 }
137 v.addElement(item);
138 }
139 Item[] foundItems = new Item[v.size()];
140 v.copyInto(foundItems);
141 return foundItems;
142 }
143
144 public String toString() {
145 StringBuffer b = new StringBuffer () ;
146 for (int i = 0; i < items_.length; ++i) {
147 b.append(items_[i].getTitle()).append("\n");
148 }
149 return b.toString() ;
150 }
151 }
152
153 |
Popular Tags |
Java API By Example, From Geeks To Geeks.