1 package com.indexdata.mkjsf.pazpar2.data;
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3 import java.io.ByteArrayInputStream;
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4 import java.io.IOException;
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5 import java.io.UnsupportedEncodingException;
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6 import java.util.Arrays;
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7 import java.util.List;
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8 import java.util.Stack;
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10 import javax.xml.parsers.ParserConfigurationException;
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11 import javax.xml.parsers.SAXParser;
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12 import javax.xml.parsers.SAXParserFactory;
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14 import org.apache.log4j.Logger;
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15 import org.xml.sax.Attributes;
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16 import org.xml.sax.InputSource;
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17 import org.xml.sax.SAXException;
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18 import org.xml.sax.XMLReader;
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19 import org.xml.sax.helpers.DefaultHandler;
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21 import com.indexdata.mkjsf.pazpar2.ClientCommandResponse;
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22 import com.indexdata.mkjsf.pazpar2.data.sp.AuthResponse;
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23 import com.indexdata.mkjsf.pazpar2.data.sp.CategoriesResponse;
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24 import com.indexdata.mkjsf.pazpar2.data.sp.TargetCategory;
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26 public class ResponseParser extends DefaultHandler {
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28 private XMLReader xmlReader = null;
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29 private ResponseDataObject currentElement = null;
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30 private Stack<ResponseDataObject> dataElements = new Stack<ResponseDataObject>();
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31 private ResponseDataObject result = null;
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32 private String xml = null;
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33 private static Logger logger = Logger.getLogger(ResponseParser.class);
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35 public static List<String> docTypes = Arrays.asList( "bytarget","termlist","show","stat","record","search","init",
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36 /* SP extras */ "auth", "categories" );
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38 public ResponseParser() {
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41 } catch (ParserConfigurationException e) {
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42 // TODO Auto-generated catch block
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43 e.printStackTrace();
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44 } catch (SAXException e) {
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45 // TODO Auto-generated catch block
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46 e.printStackTrace();
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50 public static ResponseParser getParser() {
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51 return new ResponseParser();
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54 private void initSax() throws ParserConfigurationException, SAXException {
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55 SAXParserFactory spf = SAXParserFactory.newInstance();
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56 spf.setNamespaceAware(true);
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57 SAXParser saxParser = spf.newSAXParser();
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58 xmlReader = saxParser.getXMLReader();
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59 xmlReader.setContentHandler(this);
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63 * Parses a Pazpar2 XML response -- or an error response as XML -- and produces a
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64 * ResponseDataObject object, i.e. a 'show' object
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66 * @param response XML response string from Pazpar2
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67 * @return Response data object
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69 public ResponseDataObject getDataObject (ClientCommandResponse response) {
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70 this.xml = response.getResponseString();
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72 xmlReader.parse(new InputSource(new ByteArrayInputStream(response.getResponseToParse())));
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73 } catch (UnsupportedEncodingException e) {
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74 e.printStackTrace();
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75 } catch (IOException e) {
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76 e.printStackTrace();
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77 } catch (SAXException e) {
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78 e.printStackTrace();
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84 * Receive notification at the start of element
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88 public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {
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89 if (localName.equals("init")) {
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90 currentElement = new InitResponse();
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91 } else if (localName.equals("search")) {
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92 currentElement = new SearchResponse();
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93 } else if (localName.equals("show")) {
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94 currentElement = new ShowResponse();
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95 } else if (localName.equals("hit")) {
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96 currentElement = new Hit();
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97 } else if (localName.equals("location")) {
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98 currentElement = new Location();
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99 } else if (localName.equals("record")) {
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100 currentElement = new RecordResponse();
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101 } else if (localName.equals("bytarget")) {
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102 currentElement = new ByTarget();
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103 } else if (localName.equals("target")) {
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104 currentElement = new Target();
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105 } else if (localName.equals("stat")) {
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106 currentElement = new StatResponse();
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107 } else if (localName.equals("termlist")) {
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108 currentElement = new TermListsResponse();
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109 } else if (localName.equals("list")) {
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110 currentElement = new TermListResponse();
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111 ((TermListResponse)currentElement).setName(atts.getValue("name"));
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112 ((TermListsResponse)dataElements.peek()).addTermList((TermListResponse)currentElement);
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113 } else if (localName.equals("term")) {
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114 if (dataElements.peek().getAttribute("name").equals("xtargets")) {
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115 currentElement = new TermXTargetResponse();
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117 currentElement = new TermResponse();
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119 ((TermListResponse)dataElements.peek()).addTerm((TermResponse)currentElement);
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120 } else if (localName.equals("applicationerror")) {
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121 currentElement = new CommandError();
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122 } else if (localName.equals("error") && dataElements.peek().getType().equals("applicationerror")) {
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123 currentElement = new ServiceError();
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124 // Service Proxy extras
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125 } else if (localName.equals("auth")) {
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126 currentElement = new AuthResponse();
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127 } else if (localName.equals("categories")) {
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128 currentElement = new CategoriesResponse();
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129 } else if (localName.equals("category") && dataElements.peek().getType().equals("categories")) {
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130 currentElement = new TargetCategory();
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133 currentElement = new ResponseDataObject();
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135 currentElement.setType(localName);
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136 for (int i=0; i< atts.getLength(); i++) {
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137 currentElement.setAttribute(atts.getLocalName(i), atts.getValue(i));
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139 if (!docTypes.contains(localName)) {
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140 if (dataElements.size() == 0) {
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141 logger.info("Encountered unknown top level element [" + localName + "]. Creating generic data object.");
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142 currentElement.setType(localName);
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144 dataElements.peek().addElement(localName, currentElement);
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147 if (this.xml != null) { // Store XML for doc level elements
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148 currentElement.setXml(xml);
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151 dataElements.push(currentElement);
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155 public void characters(char[] ch, int start, int length) throws SAXException {
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156 String data = new String(ch, start, length);
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157 dataElements.peek().appendContent(data);
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161 public void endElement(String namespaceURI, String localName, String qName) throws SAXException {
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162 if (dataElements.size()==1) {
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163 result = dataElements.pop();
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165 dataElements.pop();
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