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26
27
29 package de.nava.informa.parsers;
30
31 import java.io.File  ;
32 import java.io.IOException ;
33 import java.io.InputStream ;
34 import java.io.Reader ;
35 import java.net.URL ;
36 import java.util.Collection ;
37
38 import org.apache.commons.logging.Log;
39 import org.apache.commons.logging.LogFactory;
40 import org.jdom.Document;
41 import org.jdom.Element;
42 import org.jdom.JDOMException;
43 import org.jdom.input.SAXBuilder;
44 import org.xml.sax.InputSource ;
45
46 import de.nava.informa.core.ParseException;
47 import de.nava.informa.core.UnsupportedFormatException;
48 import de.nava.informa.utils.NoOpEntityResolver;
49
50
60 public class OPMLParser {
61
62 private static Log logger = LogFactory.getLog(OPMLParser.class);
63
64 private OPMLParser() {
65 }
66
67 public static Collection parse(URL aURL) throws IOException , ParseException {
68 return parse(new InputSource (aURL.toExternalForm()), aURL);
69 }
70
71
75 public static Collection parse(String url) throws IOException , ParseException {
76 URL aURL = null;
77 try {
78 aURL = new URL (url);
79 } catch (java.net.MalformedURLException e) {
80 logger.warn("Could not create URL for " + url);
81 }
82 return parse(new InputSource (url), aURL);
83 }
84
85 public static Collection parse(Reader reader) throws IOException , ParseException {
86 return parse(new InputSource (reader), null);
87 }
88
89 public static Collection parse(InputStream stream) throws IOException , ParseException {
90 return parse(new InputSource (stream), null);
91 }
92
93 public static Collection parse(File aFile) throws IOException , ParseException {
94 URL aURL = null;
95 try {
96 aURL = aFile.toURL();
97 } catch (java.net.MalformedURLException e) {
98 throw new IOException ("File " + aFile + " had invalid URL " +
99 "representation.");
100 }
101 return parse(new InputSource (aURL.toExternalForm()), aURL);
102 }
103
104 public static Collection parse(InputSource inpSource,
105 URL baseLocation) throws IOException , ParseException {
106 SAXBuilder saxBuilder = new SAXBuilder(false);
108 saxBuilder.setEntityResolver(new NoOpEntityResolver());
110 try {
111 Document doc = saxBuilder.build(inpSource);
112 return parse(doc);
113 } catch (JDOMException e) {
114 throw new ParseException(e);
115 }
116 }
117
118
122 private static synchronized Collection parse(Document doc) throws ParseException {
123
124 logger.debug("start parsing.");
125 Element root = doc.getRootElement();
127 String rootElement = root.getName().toLowerCase();
128 if (rootElement.startsWith("opml")) {
130 String opmlVersion = root.getAttribute("version").getValue();
131 if (opmlVersion.indexOf("1.1") >= 0) {
132 logger.info("Collection uses OPML root element (Version 1.1).");
133 return OPML_1_1_Parser.parse(root);
134 }
135 }
136
137 throw new UnsupportedFormatException("Unsupported OPML root element [" +
139 rootElement + "].");
140 }
141
142 }
143 |
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