1 | /*
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2 | * Created on Nov 17, 2004
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3 | * Copyright (C) Andrea Schweer, 2004
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4 | *
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5 | * This file is part of the Greenstone Alerting Service.
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6 | * Refer to the COPYING file in the base directory of this package
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7 | * for licensing information.
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8 | */
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9 | package org.greenstone.gsdlas;
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10 |
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11 | import java.net.URL;
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12 | import java.util.*;
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13 |
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14 | import javax.xml.parsers.*;
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15 |
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16 | import org.apache.soap.Constants;
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17 | import org.apache.soap.Fault;
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18 | import org.apache.soap.rpc.*;
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19 | import org.w3c.dom.*;
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20 |
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21 |
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22 | /**
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23 | * @author schweer
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24 | *
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25 | * TODO To change the template for this generated type comment go to Window -
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26 | * Preferences - Java - Code Style - Code Templates
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27 | */
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28 | public class GreenstoneCommunicator {
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29 |
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30 | private URL host;
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31 | private DocumentBuilder builder;
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32 |
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33 | public GreenstoneCommunicator(URL host) throws Exception {
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34 | this.host = host;
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35 | DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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36 | try {
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37 | builder = factory.newDocumentBuilder();
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38 | } catch (ParserConfigurationException e) {
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39 | throw new Exception(e);
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40 | }
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41 |
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42 | }
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43 |
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44 | public String[] getCollectionNames() throws Exception {
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45 | Document document = createSubsetDescriptionRequest("", "collectionList");
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46 |
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47 | Element response = sendToGreenstone(document.getDocumentElement());
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48 |
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49 | NodeList nodeList = response.getElementsByTagName("collection");
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50 | String[] result = new String[nodeList.getLength()];
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51 | for (int i = 0; i < nodeList.getLength(); i++) {
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52 | Node node = nodeList.item(i);
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53 | Node name = node.getAttributes().getNamedItem("name");
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54 | result[i] = name.getNodeValue();
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55 | }
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56 |
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57 | return result;
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58 | }
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59 |
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60 | public boolean supportsTextSearch(String collection) throws Exception {
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61 | Document document = createSubsetDescriptionRequest(collection, "serviceList");
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62 |
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63 | Element response = sendToGreenstone(document.getDocumentElement());
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64 |
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65 | NodeList nodeList = response.getElementsByTagName("service");
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66 |
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67 | boolean hasTextQuery = false;
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68 | for (int i = 0; i < nodeList.getLength(); i++) {
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69 | Node node = nodeList.item(i);
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70 | String name = node.getAttributes().getNamedItem("name").getNodeValue();
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71 | if (name.equals("TextQuery")) {
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72 | hasTextQuery = true;
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73 | break;
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74 | }
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75 | }
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76 |
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77 | if (!hasTextQuery) return false; // doesn't support text queries at all
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78 |
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79 | document = createSubsetDescriptionRequest(collection + "/TextQuery", "paramList");
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80 |
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81 | response = sendToGreenstone(document.getDocumentElement());
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82 |
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83 | nodeList = response.getElementsByTagName("param");
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84 |
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85 | for (int i = 0; i < nodeList.getLength(); i++) {
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86 | Node node = nodeList.item(i);
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87 | String name = node.getAttributes().getNamedItem("name").getNodeValue();
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88 | if (name == null) break;
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89 | String value = node.getAttributes().getNamedItem("type").getNodeValue();
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90 | if (value == null) break;
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91 | if (name.equals("query") && value.equals("string")) {
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92 | return true;
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93 | }
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94 | }
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95 |
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96 | return false;
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97 | }
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98 |
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99 | public Set fullTextSearch(String collection, String query) throws Exception {
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100 | Document document = builder.newDocument();
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101 | Element root = document.createElement("message");
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102 | document.appendChild(root);
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103 |
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104 | Element requestElement = document.createElement("request");
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105 | requestElement.setAttribute("lang", "en");
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106 | requestElement.setAttribute("type", "process");
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107 | requestElement.setAttribute("to", collection + "/TextQuery");
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108 | root.appendChild(requestElement);
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109 |
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110 | Element paramListElement = document.createElement("paramList");
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111 | requestElement.appendChild(paramListElement);
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112 |
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113 | Element paramElement = document.createElement("param");
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114 | paramElement.setAttribute("name", "query");
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115 | paramElement.setAttribute("value", query);
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116 | // BTS 3 what if numReturnedDocs < numMatchedDocs
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117 | paramListElement.appendChild(paramElement);
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118 |
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119 |
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120 | Set result = new TreeSet();
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121 |
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122 | Element response = sendToGreenstone(document.getDocumentElement());
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123 |
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124 | NodeList documentNodes = response.getElementsByTagName("documentNode");
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125 |
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126 | for(int i = 0; i < documentNodes.getLength(); i++) {
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127 | Node node = documentNodes.item(i);
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128 | String docID = node.getAttributes().getNamedItem("nodeID").getNodeValue();
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129 | // TODO what about the nodeType
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130 | result.add(docID);
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131 | }
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132 |
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133 | return result;
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134 | }
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135 |
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136 | private Element sendToGreenstone(Element message) throws Exception {
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137 | Call call = new Call();
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138 | call.setTargetObjectURI("teevee.localsite");
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139 | call.setMethodName("process");
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140 | // set Encoding Style to use literal XML
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141 | call.setEncodingStyleURI(Constants.NS_URI_LITERAL_XML);
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142 | // Set Method Parameters - use literal xml
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143 | Parameter param = new Parameter("message",
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144 | org.w3c.dom.Element.class,
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145 | message,
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146 | Constants.NS_URI_LITERAL_XML);
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147 |
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148 | Vector paramList = new Vector();
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149 | paramList.addElement(param);
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150 | call.setParams(paramList);
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151 |
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152 | // Invoke the Service
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153 | Response response = call.invoke(host, "");
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154 |
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155 | // Check for Faults
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156 | if (!response.generatedFault()) { // no error
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157 | // Extract Return value
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158 | Parameter result = response.getReturnValue();
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159 | return (Element) result.getValue();
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160 | } else {
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161 | // Extract Fault Code and String
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162 | Fault f = response.getFault();
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163 | String faultCode = f.getFaultCode();
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164 | String faultString = f.getFaultString();
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165 | throw new Exception(faultCode + ": Fault occured: " + faultString);
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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 | * @return
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171 | */
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172 | private Document createSubsetDescriptionRequest(String object, String subsetType) {
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173 | Document document = builder.newDocument();
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174 | Element root = document.createElement("message");
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175 | document.appendChild(root);
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176 |
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177 | Element requestElement = document.createElement("request");
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178 | requestElement.setAttribute("lang", "en");
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179 | requestElement.setAttribute("type", "describe");
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180 | requestElement.setAttribute("to", object);
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181 | root.appendChild(requestElement);
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182 |
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183 | Element paramListElement = document.createElement("paramList");
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184 | requestElement.appendChild(paramListElement);
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185 |
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186 | Element paramElement = document.createElement("param");
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187 | paramElement.setAttribute("name", "subset");
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188 | paramElement.setAttribute("value", subsetType);
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189 | paramListElement.appendChild(paramElement);
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190 | return document;
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191 | }
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192 | } |
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