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1
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1 /* XMLListLoader -- Load an XML list 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) 2001, 2002 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 // JAXP packages
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88
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24 import java.io.IOException;
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25 import java.util.HashMap;
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26 import java.util.LinkedList;
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1
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27
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88
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28 import javax.xml.parsers.ParserConfigurationException;
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29 import javax.xml.parsers.SAXParser;
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30 import javax.xml.parsers.SAXParserFactory;
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31
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32 import org.xml.sax.Attributes;
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33 import org.xml.sax.SAXException;
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34 import org.xml.sax.SAXParseException;
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35 import org.xml.sax.XMLReader;
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36 import org.xml.sax.helpers.DefaultHandler;
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1
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37
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38 public class XMLListLoader {
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39
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88
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40 private String listTag = "list";
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41 private String entryTag = "entry";
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42 private String keyAtt = "key";
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43 private String valueAtt = "value";
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1
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44
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88
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45 public XMLListLoader() {
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46 }
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47
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88
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48 public XMLListLoader(
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49 String list_tag,
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50 String entry_tag,
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51 String key_att,
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52 String value_att) {
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53 //System.out.println("xmlListLoader("+list_tag+","+entry_tag+","+key_att+","+value_att+")");
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54 listTag = list_tag;
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55 entryTag = entry_tag;
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56 keyAtt = key_att;
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57 valueAtt = value_att;
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58 }
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1
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59
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88
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60 /**
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61 * inner class XMLListParser to be called by the parser
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62 */
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63 private class XMLListParser extends DefaultHandler {
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64
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65 private HashMap listData;
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66 private LinkedList nameSpace;
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67
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68 public HashMap getData() {
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69 return listData;
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70 }
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1
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71
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88
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72 // Parser calls this once at the beginning of a document
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73 public void startDocument() throws SAXException {
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74 listData = new HashMap();
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75 nameSpace = new LinkedList();
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76 }
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1
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77
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88
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78 // Parser calls this for each element in a document
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79 public void startElement(
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80 String namespaceURI,
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81 String localName,
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82 String qName,
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83 Attributes atts)
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84 throws SAXException {
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85 //System.out.println("<"+qName);
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86 // open a new namespace
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87 nameSpace.addLast(qName);
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1
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88
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88
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89 // ist it an entry tag?
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90 if (qName.equals(entryTag)) {
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91 // is it inside a list tag?
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92 if ((listTag.length() > 0) && (!nameSpace.contains(listTag))) {
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93 System.out.println(
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94 "BOO: Entry "
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95 + entryTag
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96 + " not inside list "
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97 + listTag);
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98 throw new SAXParseException(
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99 "Entry " + entryTag + " not inside list " + listTag,
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100 null);
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101 }
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102 // get the attributes
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103 String key = atts.getValue(keyAtt);
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104 String val = atts.getValue(valueAtt);
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105 if ((key == null) || (val == null)) {
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106 System.out.println(
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107 "BOO: Entry "
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108 + entryTag
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109 + " does not have Attributes "
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110 + keyAtt
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111 + ", "
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112 + valueAtt);
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113 throw new SAXParseException(
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114 "Entry "
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115 + entryTag
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116 + " does not have Attributes "
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117 + keyAtt
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118 + ", "
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119 + valueAtt,
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120 null);
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121 }
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122 // add the values
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123 //System.out.println("DATA: "+key+" = "+val);
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124 listData.put(key, val);
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125 }
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126 }
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1
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127
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88
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128 public void endElement(
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129 String namespaceURI,
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130 String localName,
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131 String qName)
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132 throws SAXException {
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133 // exit the namespace
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134 nameSpace.removeLast();
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135 }
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1
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136
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88
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137 }
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138
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139 /**
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140 * load and parse a file (as URL)
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141 * returns HashMap with list data
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142 */
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143 public HashMap loadURL(String path) throws SAXException, IOException {
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144 //System.out.println("loadurl ("+path+")");
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145 // Create a JAXP SAXParserFactory and configure it
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146 SAXParserFactory spf = SAXParserFactory.newInstance();
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147 //spf.setNamespaceAware(true);
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1
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148
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88
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149 XMLReader xmlReader = null;
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150 try {
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151 // Create a JAXP SAXParser
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152 SAXParser saxParser = spf.newSAXParser();
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153
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154 // Get the encapsulated SAX XMLReader
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155 xmlReader = saxParser.getXMLReader();
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156 } catch (ParserConfigurationException e) {
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157 throw new SAXException(e);
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158 }
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1
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159
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88
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160 // create a list parser (keeps the data!)
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161 XMLListParser listParser = new XMLListParser();
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1
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162
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88
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163 // Set the ContentHandler of the XMLReader
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164 xmlReader.setContentHandler(listParser);
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1
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165
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88
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166 // Tell the XMLReader to parse the XML document
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167 xmlReader.parse(path);
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1
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168
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88
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169 return listParser.getData();
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170 }
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1
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171
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172 }
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