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 public class ResponseParser extends DefaultHandler {
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23 private XMLReader xmlReader = null;
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24 private ResponseDataObject currentElement = null;
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25 private Stack<ResponseDataObject> dataElements = new Stack<ResponseDataObject>();
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26 private ResponseDataObject result = null;
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27 private String xml = null;
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28 private static Logger logger = Logger.getLogger(ResponseParser.class);
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30 public static final List<String> docTypes =
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31 Arrays.asList("bytarget","termlist","show","stat","record","search","init");
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33 public ResponseParser() {
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36 } catch (ParserConfigurationException e) {
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37 // TODO Auto-generated catch block
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38 e.printStackTrace();
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39 } catch (SAXException e) {
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40 // TODO Auto-generated catch block
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41 e.printStackTrace();
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45 public static ResponseParser getParser() {
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46 return new ResponseParser();
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49 private void initSax() throws ParserConfigurationException, SAXException {
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50 SAXParserFactory spf = SAXParserFactory.newInstance();
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51 spf.setNamespaceAware(true);
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52 SAXParser saxParser = spf.newSAXParser();
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53 xmlReader = saxParser.getXMLReader();
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54 xmlReader.setContentHandler(this);
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58 * Parses a Pazpar2 XML response -- or an error response as XML -- and produces a
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59 * ResponseDataObject object, i.e. a 'show' object
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61 * @param response XML response string from Pazpar2
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62 * @return Response data object
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64 public ResponseDataObject getDataObject (String response) {
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65 this.xml = response;
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67 xmlReader.parse(new InputSource(new ByteArrayInputStream(response.getBytes("UTF-8"))));
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68 } catch (UnsupportedEncodingException e) {
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69 // TODO Auto-generated catch block
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70 e.printStackTrace();
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71 } catch (IOException e) {
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72 // TODO Auto-generated catch block
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73 e.printStackTrace();
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74 } catch (SAXException e) {
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75 // TODO Auto-generated catch block
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76 e.printStackTrace();
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82 * Receive notification at the start of element
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86 public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {
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87 if (localName.equals("init")) {
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88 currentElement = new InitResponse();
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89 } else if (localName.equals("search")) {
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90 currentElement = new SearchResponse();
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91 } else if (localName.equals("show")) {
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92 currentElement = new ShowResponse();
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93 } else if (localName.equals("hit")) {
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94 currentElement = new Hit();
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95 } else if (localName.equals("location")) {
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96 currentElement = new Location();
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97 } else if (localName.equals("record")) {
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98 currentElement = new RecordResponse();
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99 } else if (localName.equals("bytarget")) {
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100 currentElement = new ByTarget();
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101 } else if (localName.equals("target")) {
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102 currentElement = new Target();
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103 } else if (localName.equals("stat")) {
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104 currentElement = new StatResponse();
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105 } else if (localName.equals("termlist")) {
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106 currentElement = new TermListsResponse();
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107 } else if (localName.equals("list")) {
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108 currentElement = new TermListResponse();
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109 ((TermListResponse)currentElement).setName(atts.getValue("name"));
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110 ((TermListsResponse)dataElements.peek()).addTermList((TermListResponse)currentElement);
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111 } else if (localName.equals("term")) {
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112 if (dataElements.peek().getAttribute("name").equals("xtargets")) {
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113 currentElement = new TermXTargetResponse();
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115 currentElement = new TermResponse();
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117 ((TermListResponse)dataElements.peek()).addTerm((TermResponse)currentElement);
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118 } else if (localName.equals("applicationerror")) {
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119 currentElement = new CommandError();
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120 } else if (localName.equals("error") && dataElements.peek().getType().equals("applicationerror")) {
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121 currentElement = new Pazpar2Error();
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123 currentElement = new ResponseDataObject();
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125 currentElement.setType(localName);
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126 for (int i=0; i< atts.getLength(); i++) {
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127 currentElement.setAttribute(atts.getLocalName(i), atts.getValue(i));
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129 if (!docTypes.contains(localName)) {
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130 if (dataElements.size() == 0) {
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131 logger.info("Encountered unknown top level element [" + localName + "]. Creating generic data object.");
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132 currentElement.setType(localName);
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134 dataElements.peek().addElement(localName, currentElement);
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137 if (this.xml != null) { // Store XML for doc level elements
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138 currentElement.setXml(xml);
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141 dataElements.push(currentElement);
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145 public void characters(char[] ch, int start, int length) throws SAXException {
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146 String data = new String(ch, start, length);
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147 dataElements.peek().appendContent(data);
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151 public void endElement(String namespaceURI, String localName, String qName) throws SAXException {
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152 if (dataElements.size()==1) {
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153 result = dataElements.pop();
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155 dataElements.pop();
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