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