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comparison servlet/src/digilib/io/XMLMetaLoader.java @ 130:c36944be0b58

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Servlet Version 1.11a1with original size(!) - new meta data file loader - new parameter ddpi, ddpix, ddpiy (client->servlet) - new parameter mo=osize - osize scales based on ddpi and original dpi (currently only equally for x and y)
author robcast
date Wed, 02 Jul 2003 00:02:18 +0200
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children 11cfe4c89fdc
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129:ed7c1e4dd177 130:c36944be0b58
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
59 // public HashMap getData() {
60 // return meta;
61 // }
62
63 // Parser calls this once at the beginning of a document
64 public void startDocument() throws SAXException {
65 tags = new LinkedList();
66 files = new HashMap();
67 }
68
69 // Parser calls this for each element in a document
70 public void startElement(
71 String namespaceURI,
72 String localName,
73 String qName,
74 Attributes atts)
75 throws SAXException {
76
77 String name = (localName != null) ? localName : qName;
78 // open a new tag
79 tags.addLast(name);
80 // start new content (no nesting of tags and content)
81 content = new StringBuffer();
82
83 if (name.equals(metaTag)) {
84 // new meta tag
85 meta = new HashMap();
86 } else if (name.equals(fileTag)) {
87 // new file tag
88 fileName = null;
89 filePath = null;
90 }
91 }
92
93 // parser calls this for all tag content (possibly more than once)
94 public void characters(char[] ch, int start, int length)
95 throws SAXException {
96 // append data to current string buffer
97 content.append(ch, start, length);
98 }
99
100 // parser calls this at the end of each element
101 public void endElement(
102 String namespaceURI,
103 String localName,
104 String qName)
105 throws SAXException {
106
107 String name = (localName != null) ? localName : qName;
108 // exit the tag
109 tags.removeLast();
110
111 // was it a file.name tag?
112 if (name.equals(fileNameTag) && tags.contains(fileTag)) {
113 // save name as filename
114 if ((content != null)&&(content.length() > 0)) {
115 fileName = content.toString();
116 }
117 return;
118 }
119
120 // was it a file.path tag?
121 if (name.equals(filePathTag) && tags.contains(fileTag)) {
122 // save path as filepath
123 if ((content != null)&&(content.length() > 0)) {
124 filePath = content.toString();
125 }
126 return;
127 }
128
129 // was it a file tag?
130 if (name.equals(fileTag)) {
131 // is there meta to save?
132 if ((meta != null)&&(meta.size() > 0)) {
133 // file name is either file.path or file.name
134 String fn = null;
135 if (filePath != null) {
136 fn = filePath;
137 } else if (fileName != null) {
138 fn = fileName;
139 } else {
140 // no file name, no file
141 return;
142 }
143 // save meta in file list
144 files.put(fn, meta);
145 }
146 return;
147 }
148
149 // was it a meta tag outside a file tag?
150 if (name.equals(metaTag) && !tags.contains(fileTag)) {
151 // save meta as dir meta
152 if ((meta != null)&&(meta.size() > 0)) {
153 files.put("", meta);
154 }
155 return;
156 }
157
158 // is this inside an info tag?
159 if (tags.contains(infoTag)) {
160 // then add whatever this is
161 if ((content != null)&&(content.length() > 0)) {
162 meta.put(name, content.toString());
163 }
164 }
165
166 }
167
168 }
169
170 /**
171 * load and parse a file (as URL)
172 * returns HashMap with list data
173 */
174 public HashMap loadURL(String path) throws SAXException, IOException {
175 //System.out.println("loadurl ("+path+")");
176 // Create a JAXP SAXParserFactory and configure it
177 SAXParserFactory spf = SAXParserFactory.newInstance();
178 spf.setNamespaceAware(true);
179
180 SAXParser parser = null;
181 try {
182 // Create a JAXP SAXParser
183 parser = spf.newSAXParser();
184
185 } catch (ParserConfigurationException e) {
186 throw new SAXException(e);
187 }
188
189 // create a list parser (keeps the data!)
190 XMLMetaParser listParser = new XMLMetaParser();
191
192 // Tell the SAXParser to parse the XML document
193 parser.parse(path, listParser);
194
195 return listParser.files;
196 }
197
198 }