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1
17 package org.alfresco.repo.content.metadata;
18
19 import java.io.InputStream  ;
20 import java.io.InputStreamReader ;
21 import java.io.Reader ;
22 import java.io.Serializable ;
23 import java.util.HashMap ;
24 import java.util.HashSet ;
25 import java.util.Map ;
26 import java.util.Set ;
27
28 import javax.swing.text.ChangedCharSetException ;
29 import javax.swing.text.MutableAttributeSet ;
30 import javax.swing.text.html.HTML ;
31 import javax.swing.text.html.HTMLEditorKit ;
32 import javax.swing.text.html.parser.ParserDelegator ;
33
34 import org.alfresco.model.ContentModel;
35 import org.alfresco.repo.content.MimetypeMap;
36 import org.alfresco.service.cmr.repository.ContentReader;
37 import org.alfresco.service.namespace.QName;
38
39
43 public class HtmlMetadataExtracter extends AbstractMetadataExtracter
44 {
45 private static final Set <String > MIMETYPES = new HashSet <String >(5);
46 static
47 {
48 MIMETYPES.add(MimetypeMap.MIMETYPE_HTML);
49 MIMETYPES.add(MimetypeMap.MIMETYPE_XHTML);
50 }
51
52 public HtmlMetadataExtracter()
53 {
54 super(MIMETYPES, 1.0, 1000);
55 }
56
57 public void extractInternal(ContentReader reader, Map <QName, Serializable > destination) throws Throwable
58 {
59 final Map <QName, Serializable > tempDestination = new HashMap <QName, Serializable >();
60
61 HTMLEditorKit.ParserCallback callback = new HTMLEditorKit.ParserCallback ()
62 {
63 StringBuffer title = null;
64 boolean inHead = false;
65
66 public void handleText(char[] data, int pos)
67 {
68 if (title != null)
69 {
70 title.append(data);
71 }
72 }
73
74 public void handleComment(char[] data, int pos)
75 {
76 }
78
79 public void handleStartTag(HTML.Tag t, MutableAttributeSet a, int pos)
80 {
81 if (HTML.Tag.HEAD.equals(t))
82 {
83 inHead = true;
84 }
85 else if (HTML.Tag.TITLE.equals(t) && inHead)
86 {
87 title = new StringBuffer ();
88 }
89 else
90 handleSimpleTag(t, a, pos);
91 }
92
93 public void handleEndTag(HTML.Tag t, int pos)
94 {
95 if (HTML.Tag.HEAD.equals(t))
96 {
97 inHead = false;
98 }
99 else if (HTML.Tag.TITLE.equals(t) && title != null)
100 {
101 trimPut(ContentModel.PROP_TITLE, title.toString(), tempDestination);
102 title = null;
103 }
104 }
105
106 public void handleSimpleTag(HTML.Tag t, MutableAttributeSet a, int pos)
107 {
108 if (HTML.Tag.META.equals(t))
109 {
110 Object nameO = a.getAttribute(HTML.Attribute.NAME);
111 Object valueO = a.getAttribute(HTML.Attribute.CONTENT);
112 if (nameO == null || valueO == null)
113 return;
114
115 String name = nameO.toString();
116
117 if (name.equalsIgnoreCase("creator") || name.equalsIgnoreCase("author")
118 || name.equalsIgnoreCase("dc.creator"))
119 {
120 trimPut(ContentModel.PROP_AUTHOR, valueO, tempDestination);
121 }
122 if (name.equalsIgnoreCase("description") || name.equalsIgnoreCase("dc.description"))
123 {
124 trimPut(ContentModel.PROP_DESCRIPTION, valueO, tempDestination);
125 }
126 }
127 }
128
129 public void handleError(String errorMsg, int pos)
130 {
131 }
132 };
133
134 String charsetGuess = "UTF-8";
135 int tries = 0;
136 while (tries < 3)
137 {
138 tempDestination.clear();
139 Reader r = null;
140 InputStream cis = null;
141 try
142 {
143 cis = reader.getContentInputStream();
144 r = new InputStreamReader (cis);
146 HTMLEditorKit.Parser parser = new ParserDelegator ();
147 parser.parse(r, callback, tries > 0);
148 destination.putAll(tempDestination);
149 break;
150 }
151 catch (ChangedCharSetException ccse)
152 {
153 tries++;
154 charsetGuess = ccse.getCharSetSpec();
155 int begin = charsetGuess.indexOf("charset=");
156 if (begin > 0)
157 charsetGuess = charsetGuess.substring(begin + 8, charsetGuess.length());
158 reader = reader.getReader();
159 }
160 finally
161 {
162 if (r != null)
163 r.close();
164 if (cis != null)
165 cis.close();
166 }
167 }
168 }
169 }
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