Mercurial > hg > digilib-old
annotate servlet/src/digilib/io/XMLMetaLoader.java @ 139:11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
- fixed lots of bugs in metadata handling.
| author | robcast |
|---|---|
| date | Thu, 31 Jul 2003 20:56:51 +0200 |
| parents | c36944be0b58 |
| children | bc8df0133c04 |
| rev | line source |
|---|---|
| 130 | 1 /* XMLMetaLoader -- Load an XML format metadata into a Hashtable |
| 2 | |
| 3 Digital Image Library servlet components | |
| 4 | |
| 5 Copyright (C) 2003 Robert Casties (robcast@mail.berlios.de) | |
| 6 | |
| 7 This program is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 2 of the License, or (at your | |
| 10 option) any later version. | |
| 11 | |
| 12 Please read license.txt for the full details. A copy of the GPL | |
| 13 may be found at http://www.gnu.org/copyleft/lgpl.html | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
| 16 along with this program; if not, write to the Free Software | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 */ | |
| 20 | |
| 21 package digilib.io; | |
| 22 | |
| 23 import java.io.IOException; | |
| 24 import java.util.HashMap; | |
| 25 import java.util.LinkedList; | |
| 26 | |
| 27 import javax.xml.parsers.ParserConfigurationException; | |
| 28 import javax.xml.parsers.SAXParser; | |
| 29 import javax.xml.parsers.SAXParserFactory; | |
| 30 | |
| 31 import org.xml.sax.Attributes; | |
| 32 import org.xml.sax.SAXException; | |
| 33 import org.xml.sax.helpers.DefaultHandler; | |
| 34 | |
| 35 public class XMLMetaLoader { | |
| 36 | |
| 37 private String outerTag = "resource"; | |
| 38 private String metaTag = "meta"; | |
| 39 private String fileTag = "file"; | |
| 40 private String fileNameTag = "name"; | |
| 41 private String filePathTag = "path"; | |
| 42 private String infoTag = "img"; | |
| 43 | |
| 44 public XMLMetaLoader() { | |
| 45 } | |
| 46 | |
| 47 /** | |
| 48 * inner class XMLMetaParser to be called by the parser | |
| 49 */ | |
| 50 private class XMLMetaParser extends DefaultHandler { | |
| 51 | |
| 52 private LinkedList tags; | |
| 53 private HashMap files; | |
| 54 private HashMap meta; | |
| 55 private StringBuffer content; | |
| 56 private String fileName; | |
| 57 private String filePath; | |
| 58 | |
|
139
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
59 /** |
|
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
60 * extracts the elements name from either localName ln or qName qn. |
|
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
61 * |
|
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
62 * @param ln localName |
|
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
63 * @param qn qName |
|
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
64 * @return element name |
|
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
65 */ |
|
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
66 private String getName(String ln, String qn) { |
|
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
67 if (ln != null) { |
|
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
68 if (ln.length() > 0) { |
|
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
69 return ln; |
|
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
70 } |
|
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
71 } |
|
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
72 // else it's qName (or nothing) |
|
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
73 return qn; |
|
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
74 } |
| 130 | 75 |
| 76 // Parser calls this once at the beginning of a document | |
| 77 public void startDocument() throws SAXException { | |
| 78 tags = new LinkedList(); | |
| 79 files = new HashMap(); | |
| 80 } | |
| 81 | |
| 82 // Parser calls this for each element in a document | |
| 83 public void startElement( | |
| 84 String namespaceURI, | |
| 85 String localName, | |
| 86 String qName, | |
| 87 Attributes atts) | |
| 88 throws SAXException { | |
| 89 | |
|
139
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
90 String name = getName(localName, qName); |
| 130 | 91 // open a new tag |
| 92 tags.addLast(name); | |
| 93 // start new content (no nesting of tags and content) | |
| 94 content = new StringBuffer(); | |
| 95 | |
| 96 if (name.equals(metaTag)) { | |
| 97 // new meta tag | |
| 98 meta = new HashMap(); | |
| 99 } else if (name.equals(fileTag)) { | |
| 100 // new file tag | |
| 101 fileName = null; | |
| 102 filePath = null; | |
|
139
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
103 meta = new HashMap(); |
| 130 | 104 } |
| 105 } | |
| 106 | |
| 107 // parser calls this for all tag content (possibly more than once) | |
| 108 public void characters(char[] ch, int start, int length) | |
| 109 throws SAXException { | |
| 110 // append data to current string buffer | |
| 111 content.append(ch, start, length); | |
| 112 } | |
| 113 | |
| 114 // parser calls this at the end of each element | |
| 115 public void endElement( | |
| 116 String namespaceURI, | |
| 117 String localName, | |
| 118 String qName) | |
| 119 throws SAXException { | |
| 120 | |
|
139
11cfe4c89fdc
Servlet version 1.11b1 with improved original-size.
robcast
parents:
130
diff
changeset
|
121 String name = getName(localName, qName); |
| 130 | 122 // exit the tag |
| 123 tags.removeLast(); | |
| 124 | |
| 125 // was it a file.name tag? | |
| 126 if (name.equals(fileNameTag) && tags.contains(fileTag)) { | |
| 127 // save name as filename | |
| 128 if ((content != null)&&(content.length() > 0)) { | |
| 129 fileName = content.toString(); | |
| 130 } | |
| 131 return; | |
| 132 } | |
| 133 | |
| 134 // was it a file.path tag? | |
| 135 if (name.equals(filePathTag) && tags.contains(fileTag)) { | |
| 136 // save path as filepath | |
| 137 if ((content != null)&&(content.length() > 0)) { | |
| 138 filePath = content.toString(); | |
| 139 } | |
| 140 return; | |
| 141 } | |
| 142 | |
| 143 // was it a file tag? | |
| 144 if (name.equals(fileTag)) { | |
| 145 // is there meta to save? | |
| 146 if ((meta != null)&&(meta.size() > 0)) { | |
| 147 // file name is either file.path or file.name | |
| 148 String fn = null; | |
| 149 if (filePath != null) { | |
| 150 fn = filePath; | |
| 151 } else if (fileName != null) { | |
| 152 fn = fileName; | |
| 153 } else { | |
| 154 // no file name, no file | |
| 155 return; | |
| 156 } | |
| 157 // save meta in file list | |
| 158 files.put(fn, meta); | |
| 159 } | |
| 160 return; | |
| 161 } | |
| 162 | |
| 163 // was it a meta tag outside a file tag? | |
| 164 if (name.equals(metaTag) && !tags.contains(fileTag)) { | |
| 165 // save meta as dir meta | |
| 166 if ((meta != null)&&(meta.size() > 0)) { | |
| 167 files.put("", meta); | |
| 168 } | |
| 169 return; | |
| 170 } | |
| 171 | |
| 172 // is this inside an info tag? | |
| 173 if (tags.contains(infoTag)) { | |
| 174 // then add whatever this is | |
| 175 if ((content != null)&&(content.length() > 0)) { | |
| 176 meta.put(name, content.toString()); | |
| 177 } | |
| 178 } | |
| 179 | |
| 180 } | |
| 181 | |
| 182 } | |
| 183 | |
| 184 /** | |
| 185 * load and parse a file (as URL) | |
| 186 * returns HashMap with list data | |
| 187 */ | |
| 188 public HashMap loadURL(String path) throws SAXException, IOException { | |
| 189 //System.out.println("loadurl ("+path+")"); | |
| 190 // Create a JAXP SAXParserFactory and configure it | |
| 191 SAXParserFactory spf = SAXParserFactory.newInstance(); | |
| 192 spf.setNamespaceAware(true); | |
| 193 | |
| 194 SAXParser parser = null; | |
| 195 try { | |
| 196 // Create a JAXP SAXParser | |
| 197 parser = spf.newSAXParser(); | |
| 198 | |
| 199 } catch (ParserConfigurationException e) { | |
| 200 throw new SAXException(e); | |
| 201 } | |
| 202 | |
| 203 // create a list parser (keeps the data!) | |
| 204 XMLMetaParser listParser = new XMLMetaParser(); | |
| 205 | |
| 206 // Tell the SAXParser to parse the XML document | |
| 207 parser.parse(path, listParser); | |
| 208 | |
| 209 return listParser.files; | |
| 210 } | |
| 211 | |
| 212 } |