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