Mercurial > hg > digilib-old
annotate servlet/src/digilib/io/XMLMetaLoader.java @ 152:f4a5cfe37469
Servlet version 1.16a1
- cleanup of DigilibConfig class
- now uses new Parameter and ParameterMap classes
- new parameter default-quality
| author | robcast |
|---|---|
| date | Wed, 03 Sep 2003 00:54:38 +0200 |
| parents | bc8df0133c04 |
| children | afe7ff98bb71 |
| 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 | |
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59 /** |
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60 * extracts the elements name from either localName ln or qName qn. |
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61 * |
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62 * @param ln localName |
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63 * @param qn qName |
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64 * @return element name |
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65 */ |
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66 private String getName(String ln, String qn) { |
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67 if (ln != null) { |
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68 if (ln.length() > 0) { |
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69 return ln; |
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70 } |
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71 } |
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72 // else it's qName (or nothing) |
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73 return qn; |
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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 | |
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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; | |
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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 { | |
| 151 | 120 |
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121 String name = getName(localName, qName); |
| 130 | 122 // exit the tag |
| 123 tags.removeLast(); | |
| 151 | 124 |
| 125 // was it a file/name tag? | |
| 130 | 126 if (name.equals(fileNameTag) && tags.contains(fileTag)) { |
| 127 // save name as filename | |
| 151 | 128 if ((content != null) && (content.length() > 0)) { |
| 129 fileName = content.toString().trim(); | |
| 130 | 130 } |
| 131 return; | |
| 132 } | |
| 133 | |
| 151 | 134 // was it a file/path tag? |
| 130 | 135 if (name.equals(filePathTag) && tags.contains(fileTag)) { |
| 136 // save path as filepath | |
| 151 | 137 if ((content != null) && (content.length() > 0)) { |
| 138 filePath = content.toString().trim(); | |
| 130 | 139 } |
| 140 return; | |
| 141 } | |
| 142 | |
| 143 // was it a file tag? | |
| 144 if (name.equals(fileTag)) { | |
| 145 // is there meta to save? | |
| 151 | 146 if ((meta != null) && (meta.size() > 0)) { |
| 147 // file name is (optional file/path) / file/name | |
| 130 | 148 String fn = null; |
| 151 | 149 |
| 150 if (fileName != null) { | |
| 151 if (filePath != null) { | |
| 152 fn = filePath + "/" + fileName; | |
| 153 } else { | |
| 154 fn = fileName; | |
| 155 } | |
| 130 | 156 } else { |
| 157 // no file name, no file | |
| 158 return; | |
| 159 } | |
| 160 // save meta in file list | |
| 161 files.put(fn, meta); | |
| 162 } | |
| 163 return; | |
| 164 } | |
| 165 | |
| 166 // was it a meta tag outside a file tag? | |
| 167 if (name.equals(metaTag) && !tags.contains(fileTag)) { | |
| 168 // save meta as dir meta | |
| 151 | 169 if ((meta != null) && (meta.size() > 0)) { |
| 130 | 170 files.put("", meta); |
| 171 } | |
| 172 return; | |
| 173 } | |
| 174 | |
| 151 | 175 // is this inside an info (=img) tag? |
| 130 | 176 if (tags.contains(infoTag)) { |
| 177 // then add whatever this is | |
| 151 | 178 if ((content != null) && (content.length() > 0)) { |
| 179 meta.put(name, content.toString().trim()); | |
| 130 | 180 } |
| 181 } | |
| 151 | 182 |
| 130 | 183 } |
| 184 | |
| 185 } | |
| 186 | |
| 187 /** | |
| 188 * load and parse a file (as URL) | |
| 189 * returns HashMap with list data | |
| 190 */ | |
| 191 public HashMap loadURL(String path) throws SAXException, IOException { | |
| 192 //System.out.println("loadurl ("+path+")"); | |
| 193 // Create a JAXP SAXParserFactory and configure it | |
| 194 SAXParserFactory spf = SAXParserFactory.newInstance(); | |
| 195 spf.setNamespaceAware(true); | |
| 196 | |
| 197 SAXParser parser = null; | |
| 198 try { | |
| 199 // Create a JAXP SAXParser | |
| 200 parser = spf.newSAXParser(); | |
| 201 | |
| 202 } catch (ParserConfigurationException e) { | |
| 203 throw new SAXException(e); | |
| 204 } | |
| 205 | |
| 206 // create a list parser (keeps the data!) | |
| 207 XMLMetaParser listParser = new XMLMetaParser(); | |
| 208 | |
| 209 // Tell the SAXParser to parse the XML document | |
| 210 parser.parse(path, listParser); | |
| 211 | |
| 212 return listParser.files; | |
| 213 } | |
| 214 | |
| 215 } |