1 | package org.greenstone.gsdl3.action;
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2 |
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3 | import org.greenstone.gsdl3.core.ModuleInterface;
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4 | import org.greenstone.gsdl3.util.*;
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5 | // XML classes
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6 | import org.w3c.dom.Node;
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7 | import org.w3c.dom.NodeList;
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8 | import org.w3c.dom.Document;
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9 | import org.w3c.dom.Element;
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10 |
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11 | import java.util.HashMap;
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12 | import java.util.HashSet;
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13 | import java.util.Vector;
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14 | import java.io.File;
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15 |
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16 | import org.apache.log4j.*;
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17 |
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18 | //NOTE: this class not used at present!!!!!
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19 | /** action for classifier browsing */
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20 | public class BrowseAction extends Action {
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21 |
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22 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.action.BrowseAction.class.getName());
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23 |
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24 | public static final String CLASSIFIER_ARG = "cl";
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25 | public static final String SIBLING_ARG = "sib";
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26 |
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27 | /** process the request */
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28 | public Node process (Node message_node) {
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29 |
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30 | Element message = this.converter.nodeToElement(message_node);
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31 |
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32 | // get the request - assume only one
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33 | Element request = (Element)GSXML.getChildByTagName(message, GSXML.REQUEST_ELEM);
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34 |
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35 | // the result
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36 | Element result = this.doc.createElement(GSXML.MESSAGE_ELEM);
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37 | Element response = classifierBrowse(request);
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38 | result.appendChild(response);
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39 | return result;
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40 | }
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41 |
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42 |
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43 | protected Element classifierBrowse(Element request) {
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44 |
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45 | Element page_response = this.doc.createElement(GSXML.RESPONSE_ELEM);
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46 |
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47 | // extract the params from the cgi-request, and check that we have a coll specified
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48 | Element cgi_paramList = (Element)GSXML.getChildByTagName(request, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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49 | HashMap params = GSXML.extractParams(cgi_paramList, false);
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50 |
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51 | String service_name = (String)params.get(GSParams.SERVICE);
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52 | String collection = (String)params.get(GSParams.COLLECTION);
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53 | if (collection == null || collection.equals("")) {
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54 | logger.error("classifierBrowse, need to specify a collection!");
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55 | return page_response;
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56 |
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57 | }
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58 |
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59 | //whether to retrieve siblings or not
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60 | boolean get_siblings = false;
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61 | String sibs = (String) params.get(SIBLING_ARG);
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62 | if (sibs != null && sibs.equals("1")) {
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63 | get_siblings = true;
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64 | }
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65 |
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66 | String lang = request.getAttribute(GSXML.LANG_ATT);
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67 | String uid = request.getAttribute(GSXML.USER_ID_ATT);
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68 | String to = GSPath.appendLink(collection, service_name);
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69 |
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70 | // the first part of the response is the service description
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71 | // for now get this again from the service.
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72 | // this should be cached somehow later on.
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73 |
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74 | Element info_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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75 | Element info_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_DESCRIBE, to, lang, uid);
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76 | info_message.appendChild(info_request);
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77 |
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78 | // also get the format stuff now if there is some
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79 | Element format_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_FORMAT, to, lang, uid);
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80 | info_message.appendChild(format_request);
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81 | // process the requests
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82 |
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83 | Element info_response = (Element) this.mr.process(info_message);
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84 |
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85 | // the two responses
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86 | NodeList responses = info_response.getElementsByTagName(GSXML.RESPONSE_ELEM);
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87 | Element service_response = (Element)responses.item(0);
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88 | Element format_response = (Element)responses.item(1);
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89 |
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90 | Element service_description = (Element)GSXML.getChildByTagName(service_response, GSXML.SERVICE_ELEM);
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91 | page_response.appendChild(this.doc.importNode(service_description, true));
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92 |
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93 | // if rt=d, then we are just displaying the service
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94 | String request_type = (String)params.get(GSParams.REQUEST_TYPE);
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95 | if (request_type.equals("d")) {
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96 | //return the page that we have so far
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97 | return page_response;
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98 | }
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99 |
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100 | // get the node that the user has clicked on
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101 | String classifier_node = (String)params.get(CLASSIFIER_ARG);
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102 |
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103 | // if the node is not defined, return the page that we have so far
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104 | if (classifier_node ==null || classifier_node.equals("")) {
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105 | return page_response;
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106 | }
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107 |
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108 | // the id of the classifier is the top id of the selected node
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109 | String top_id = OID.getTop(classifier_node);
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110 |
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111 | HashSet metadata_names = new HashSet();
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112 |
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113 | // add the format info into the response
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114 | Element format_elem = (Element)GSXML.getChildByTagName(format_response, GSXML.FORMAT_ELEM);
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115 | if (format_elem != null) {
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116 | // find the one for the classifier we are in
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117 | Element this_format = GSXML.getNamedElement(format_elem, GSXML.CLASSIFIER_ELEM, GSXML.NAME_ATT, top_id);
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118 | if (this_format == null) {
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119 | this_format = (Element)GSXML.getChildByTagName(format_elem, GSXML.DEFAULT_ELEM);
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120 | }
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121 | if (this_format != null) {
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122 | Element new_format = GSXML.duplicateWithNewName(this.doc, this_format, GSXML.FORMAT_ELEM, false);
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123 | // set teh format type
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124 | new_format.setAttribute(GSXML.TYPE_ATT, "browse");
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125 |
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126 | page_response.appendChild(new_format);
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127 | extractMetadataNames(new_format, metadata_names);
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128 | }
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129 | }
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130 |
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131 | logger.info("extracted meta names, "+metadata_names.toString());
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132 | // get the browse structure for the selected node
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133 | Element classify_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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134 | Element classify_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PROCESS, to, lang, uid);
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135 | classify_message.appendChild(classify_request);
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136 |
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137 | //Create a parameter list to specify the required structure information
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138 | // for now, always get ancestors and children
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139 | Element param_list = this.doc.createElement(GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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140 | classify_request.appendChild(param_list);
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141 | Element param = this.doc.createElement(GSXML.PARAM_ELEM);
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142 | param_list.appendChild(param);
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143 | param.setAttribute(GSXML.NAME_ATT, "structure");
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144 | param.setAttribute(GSXML.VALUE_ATT, "ancestors");
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145 | param = this.doc.createElement(GSXML.PARAM_ELEM);
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146 | param_list.appendChild(param);
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147 | param.setAttribute(GSXML.NAME_ATT, "structure");
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148 | param.setAttribute(GSXML.VALUE_ATT, "children");
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149 | if (get_siblings) {
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150 | param = this.doc.createElement(GSXML.PARAM_ELEM);
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151 | param_list.appendChild(param);
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152 | param.setAttribute(GSXML.NAME_ATT, "structure");
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153 | param.setAttribute(GSXML.VALUE_ATT, "siblings");
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154 | }
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155 |
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156 | // put the classifier node into a classifier node list
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157 | Element classifier_list = this.doc.createElement(GSXML.CLASS_NODE_ELEM+GSXML.LIST_MODIFIER);
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158 | Element classifier = this.doc.createElement(GSXML.CLASS_NODE_ELEM);
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159 | classifier.setAttribute(GSXML.NODE_ID_ATT, classifier_node);
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160 | classifier_list.appendChild(classifier);
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161 | classify_request.appendChild(classifier_list);
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162 |
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163 | // process the request
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164 | Element classify_response = (Element)this.mr.process(classify_message);
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165 | // get the structure element
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166 | String path = GSPath.appendLink(GSXML.RESPONSE_ELEM, GSXML.CLASS_NODE_ELEM+GSXML.LIST_MODIFIER);
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167 | path = GSPath.appendLink(path, GSXML.CLASS_NODE_ELEM);
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168 | path = GSPath.appendLink(path, GSXML.NODE_STRUCTURE_ELEM);
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169 | // assume that we always get back the top level CL1 node - this becomes the page_classifier node
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170 | path = GSPath.appendLink(path, GSXML.CLASS_NODE_ELEM);
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171 | Element cl_structure = (Element)GSXML.getNodeByPath(classify_response,
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172 | path);
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173 | if (cl_structure ==null) {
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174 | logger.error("classifier structure request returned no structure");
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175 | return page_response;
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176 | }
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177 |
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178 | // add the classifier node as the page classifier
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179 | Element page_classifier = GSXML.duplicateWithNewName(this.doc, cl_structure, GSXML.CLASSIFIER_ELEM, true);
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180 | page_response.appendChild(page_classifier);
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181 | page_classifier.setAttribute(GSXML.NAME_ATT, top_id);
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182 |
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183 | // get the metadata for each classifier node,
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184 | // then for each document node
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185 |
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186 | Element metadata_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
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187 |
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188 | boolean did_classifier = false;
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189 | boolean did_documents = false;
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190 |
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191 |
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192 | // if there are classifier nodes
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193 | // create a metadata request for the classifier, and add it to
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194 | // the the message
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195 | NodeList cl_nodes = page_classifier.getElementsByTagName(GSXML.CLASS_NODE_ELEM);
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196 |
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197 | if (cl_nodes.getLength() > 0) {
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198 | did_classifier = true;
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199 | Element cl_meta_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PROCESS, to+"MetadataRetrieve", lang, uid);
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200 | metadata_message.appendChild(cl_meta_request);
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201 |
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202 | Element new_cl_nodes_list = this.doc.createElement(GSXML.CLASS_NODE_ELEM+GSXML.LIST_MODIFIER);
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203 | cl_meta_request.appendChild(new_cl_nodes_list);
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204 |
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205 | for (int c=0; c<cl_nodes.getLength(); c++) {
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206 |
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207 | Element cl = this.doc.createElement(GSXML.CLASS_NODE_ELEM);
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208 | cl.setAttribute(GSXML.NODE_ID_ATT, ((Element)cl_nodes.item(c)).getAttribute(GSXML.NODE_ID_ATT));
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209 | new_cl_nodes_list.appendChild(cl);
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210 | }
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211 |
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212 | // create and add in the param list - for now get all the metadata
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213 | // should be based on info sent in from the recept, and the
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214 | // format stuff
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215 | Element cl_param_list = null;
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216 | if (metadata_names.isEmpty()) {
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217 | cl_param_list = this.doc.createElement(GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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218 | Element p = this.doc.createElement(GSXML.PARAM_ELEM);
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219 | cl_param_list.appendChild(p);
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220 | p.setAttribute(GSXML.NAME_ATT, "metadata");
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221 | p.setAttribute(GSXML.VALUE_ATT, "Title");
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222 | } else {
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223 | cl_param_list = createMetadataParamList(metadata_names);
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224 | }
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225 |
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226 | cl_meta_request.appendChild(cl_param_list);
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227 |
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228 | }
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229 |
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230 | // if there are document nodes in the classification (happens
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231 | // sometimes), create a second request for document metadata and
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232 | // append to the message
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233 | NodeList doc_nodes = page_classifier.getElementsByTagName(GSXML.DOC_NODE_ELEM);
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234 | if (doc_nodes.getLength() > 0) {
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235 | did_documents = true;
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236 | Element doc_meta_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PROCESS, GSPath.appendLink(collection, "DocumentMetadataRetrieve"), lang, uid);
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237 | metadata_message.appendChild(doc_meta_request);
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238 |
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239 | Element doc_list = this.doc.createElement(GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
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240 | doc_meta_request.appendChild(doc_list);
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241 |
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242 | for (int c=0; c<doc_nodes.getLength(); c++) {
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243 |
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244 | Element d = this.doc.createElement(GSXML.DOC_NODE_ELEM);
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245 | d.setAttribute(GSXML.NODE_ID_ATT, ((Element)doc_nodes.item(c)).getAttribute(GSXML.NODE_ID_ATT));
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246 | doc_list.appendChild(d);
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247 | }
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248 |
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249 | // create and add in the param list - add all for now
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250 | Element doc_param_list = this.doc.createElement(GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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251 | Element p = this.doc.createElement(GSXML.PARAM_ELEM);
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252 | doc_param_list.appendChild(p);
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253 | p.setAttribute(GSXML.NAME_ATT, "metadata");
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254 | p.setAttribute(GSXML.VALUE_ATT, "all");
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255 | doc_meta_request.appendChild(doc_param_list);
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256 |
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257 | }
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258 |
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259 | // process the metadata requests
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260 | Element metadata_response = (Element)this.mr.process(metadata_message);
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261 | if (did_classifier) {
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262 | // the classifier one will be the first response
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263 | // add the metadata lists for each node back into the
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264 | // page_classifier nodes
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265 | path = GSPath.appendLink(GSXML.RESPONSE_ELEM,
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266 | GSXML.CLASS_NODE_ELEM+GSXML.LIST_MODIFIER);
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267 | NodeList meta_response_cls = GSXML.getNodeByPath(metadata_response, path).getChildNodes();
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268 | for (int i = 0; i < cl_nodes.getLength(); i++) {
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269 | GSXML.mergeMetadataLists(cl_nodes.item(i), meta_response_cls.item(i));
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270 | }
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271 | }
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272 | if (did_documents) {
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273 | NodeList meta_response_docs = null;
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274 | if (!did_classifier) {
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275 | // its the first response
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276 | path = GSPath.appendLink(GSXML.RESPONSE_ELEM,
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277 | GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
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278 | meta_response_docs = GSXML.getNodeByPath(metadata_response, path).getChildNodes();
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279 | } else { // its the second response
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280 | meta_response_docs = GSXML.getChildByTagName(metadata_response.getElementsByTagName(GSXML.RESPONSE_ELEM).item(1), GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER).getChildNodes();
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281 | }
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282 |
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283 | for (int i = 0; i < doc_nodes.getLength(); i++) {
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284 | GSXML.mergeMetadataLists(doc_nodes.item(i), meta_response_docs.item(i));
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285 | }
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286 | }
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287 |
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288 |
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289 | logger.debug("(BrowseAction) Page:\n" + this.converter.getPrettyString(page_response));
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290 | return page_response;
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291 | }
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292 |
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293 | protected Element unknownBrowse(Element page, Element request, String browse_type) {
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294 | logger.error("unknown browse subtype: "+browse_type);
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295 | return null;
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296 | }
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297 | }
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298 |
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299 |
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