1 | package org.greenstone.gsdl3.core;
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2 |
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3 | import org.greenstone.gsdl3.util.*;
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4 | import org.greenstone.gsdl3.action.*;
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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 | // other java classes
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12 | import java.io.File;
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13 | import java.util.*;
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14 |
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15 | import org.apache.log4j.*;
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16 |
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17 | /** a Receptionist, used for oai metadata response xml generation.
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18 | * This receptionist talks to the message router directly,
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19 | * instead of via any action, hence no action map is needed.
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20 | * @see the basic Receptionist
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21 | */
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22 | public class OAIReceptionist implements ModuleInterface {
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23 |
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24 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.core.OAIReceptionist.class.getName());
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25 |
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26 | /** Instead of a config_params object, only a site_name is needed by oai receptionist. */
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27 | protected String site_name = null;
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28 | /** container Document to create XML Nodes for requests sent to message router
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29 | * Not used for response
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30 | */
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31 | protected Document doc=null;
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32 |
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33 | /** a converter class to parse XML and create Docs */
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34 | protected XMLConverter converter=null;
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35 |
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36 | /** the configure file of this receptionist passed from the oai servlet. */
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37 | protected Element oai_config = null;
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38 |
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39 | /** contained in the OAIConfig.xml deciding whether the resumptionToken should be in use */
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40 | protected int resume_after = -1 ;
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41 |
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42 | /** the message router that the Receptionist and Actions will talk to */
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43 | protected ModuleInterface mr = null;
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44 |
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45 | public OAIReceptionist() {
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46 | this.converter = new XMLConverter();
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47 | this.doc = this.converter.newDOM();
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48 |
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49 | }
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50 |
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51 | public void cleanUp() {}
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52 |
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53 | public void setSiteName(String site_name) {
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54 | this.site_name = site_name;
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55 | }
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56 | /** sets the message router - it should already be created and
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57 | * configured in the init() of a servlet (OAIServer, for example) before being passed to the receptionist*/
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58 | public void setMessageRouter(ModuleInterface mr) {
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59 | this.mr = mr;
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60 | }
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61 |
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62 | /** configures the receptionist */
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63 | public boolean configure(Element config) {
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64 |
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65 | if (this.mr==null) {
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66 | logger.error(" message routers must be set before calling oai configure");
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67 | return false;
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68 | }
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69 | if (config == null) {
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70 | logger.error(" oai configure file is null");
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71 | return false;
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72 | }
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73 | oai_config = config;
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74 | resume_after = getResumeAfter();
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75 |
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76 | //clear out expired resumption tokens stored in OAIResumptionToken.xml
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77 | OAIXML.init();
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78 | OAIXML.clearExpiredTokens();
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79 |
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80 | return true;
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81 | }
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82 | /** process using strings - just calls process using Elements */
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83 | public String process(String xml_in) {
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84 |
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85 | Element message = this.converter.getDOM(xml_in).getDocumentElement();
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86 | Element page = process(message);
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87 | return this.converter.getString(page);
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88 | }
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89 | //Compose a message element used to send back to the OAIServer servlet.
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90 | //This method is only used within OAIReceptionist
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91 | private Element getMessage(Element e) {
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92 | Element msg = OAIXML.createElement(OAIXML.MESSAGE);
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93 | msg.appendChild(OAIXML.getResponse(e));
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94 | return msg;
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95 | }
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96 | /** process - produce xml data in response to a request
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97 | * if something goes wrong, it returns null -
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98 | */
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99 | public Element process(Element message) {
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100 | logger.error("OAIReceptionist received request");
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101 | logger.error(this.converter.getString(message));
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102 | // check that its a correct message tag
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103 | if (!message.getTagName().equals(GSXML.MESSAGE_ELEM)) {
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104 | logger.error(" Invalid message. GSDL message should start with <"+GSXML.MESSAGE_ELEM+">, instead it starts with:"+message.getTagName()+".");
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105 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
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106 | }
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107 |
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108 | // get the request out of the message - assume that there is only one
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109 | Element request = (Element)GSXML.getChildByTagName(message, GSXML.REQUEST_ELEM);
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110 | if (request == null) {
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111 | logger.error(" message had no request!");
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112 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
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113 | }
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114 | //At this stage, the value of 'to' attribute of the request must be the 'verb'
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115 | //The only thing that the oai receptionist can be sure is that these verbs are valid, nothing else.
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116 | String verb = request.getAttribute(GSXML.TO_ATT);
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117 | if (verb.equals(OAIXML.IDENTIFY)) {
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118 | return doIdentify();
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119 | }
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120 | if (verb.equals(OAIXML.LIST_METADATA_FORMATS)) {
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121 | return doListMetadataFormats(message);
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122 | }
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123 | if (verb.equals(OAIXML.LIST_SETS)) {
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124 | return doListSets(message);
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125 | }
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126 | if (verb.equals(OAIXML.GET_RECORD)) {
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127 | return doGetRecord(message);
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128 | }
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129 | if (verb.equals(OAIXML.LIST_IDENTIFIERS)) {
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130 | return doListIdentifiers(message);
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131 | }
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132 | if (verb.equals(OAIXML.LIST_RECORDS)) {
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133 | return doListRecords(message);
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134 | }
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135 | return getMessage(OAIXML.createErrorElement("Unexpected things happened", ""));
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136 |
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137 | }
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138 | /** send a request to the message router asking for a list of collections that support oai
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139 | * The type attribute must be changed from 'oaiService' to 'oaiSetList'
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140 | */
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141 | private NodeList getOAICollectionList() {
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142 | Element message = this.doc.createElement(OAIXML.MESSAGE);
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143 | Element request = this.doc.createElement(OAIXML.REQUEST);
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144 | message.appendChild(request);
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145 | request.setAttribute(OAIXML.TYPE, OAIXML.OAI_SET_LIST);
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146 | request.setAttribute(OAIXML.TO, "");
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147 | Element msg_elem = mr.process(message);
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148 |
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149 | if (msg_elem == null) {
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150 | logger.error("returned msg_elem from mr is null");
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151 | return null;
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152 | }
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153 | Element resp = (Element)GSXML.getChildByTagName(msg_elem, OAIXML.RESPONSE);
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154 | Element coll_list = (Element)GSXML.getChildByTagName(resp, OAIXML.COLLECTION_LIST);
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155 | if (coll_list == null) {
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156 | logger.error("coll_list is null");
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157 | return null;
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158 | }
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159 | //logger.info(GSXML.xmlNodeToString(coll_list));
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160 | NodeList list = coll_list.getElementsByTagName(OAIXML.COLLECTION);
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161 | int length = list.getLength();
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162 | if (length == 0) {
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163 | logger.error("length is 0");
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164 | return null;
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165 | }
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166 | return list;
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167 | }
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168 | /**Exclusively called by doListSets()*/
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169 | private void getSets(Element list_sets_elem, NodeList oai_coll, int start_point, int end_point) {
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170 | for (int i=start_point; i<end_point; i++) {
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171 | String coll_spec = ((Element)oai_coll.item(i)).getAttribute(OAIXML.NAME);
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172 | String coll_name = coll_spec.substring(coll_spec.indexOf(":") + 1);
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173 | Element set = OAIXML.createElement(OAIXML.SET);
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174 | Element set_spec = OAIXML.createElement(OAIXML.SET_SPEC);
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175 | GSXML.setNodeText(set_spec, coll_spec);
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176 | set.appendChild(set_spec);
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177 | Element set_name = OAIXML.createElement(OAIXML.SET_NAME);
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178 | GSXML.setNodeText(set_name, coll_name);
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179 | set.appendChild(set_name);
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180 | list_sets_elem.appendChild(set);
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181 | }
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182 | }
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183 | private int getResumeAfter() {
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184 | Element resume_after = (Element)GSXML.getChildByTagName(oai_config, OAIXML.RESUME_AFTER);
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185 | if(resume_after != null) return Integer.parseInt(GSXML.getNodeText(resume_after));
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186 | return -1;
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187 | }
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188 | /** method to compose a set element
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189 | */
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190 | private Element doListSets(Element msg){
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191 | logger.info("");
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192 | // option: resumptionToken
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193 | // exceptions: badArgument, badResumptionToken, noSetHierarchy
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194 | Element list_sets_elem = OAIXML.createElement(OAIXML.LIST_SETS);
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195 |
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196 | //ask the message router for a list of oai collections
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197 | NodeList oai_coll = getOAICollectionList();
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198 | int oai_coll_size = oai_coll.getLength();
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199 | if (oai_coll_size == 0) {
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200 | return getMessage(list_sets_elem);
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201 | }
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202 |
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203 | Element req = (Element)GSXML.getChildByTagName(msg, GSXML.REQUEST_ELEM);
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204 | if (req == null) {
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205 | logger.error("req is null");
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206 | return null;
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207 | }
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208 | //params list only contains the parameters other than the verb
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209 | NodeList params = GSXML.getChildrenByTagName(req, OAIXML.PARAM);
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210 | Element param = null;
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211 | int smaller = (oai_coll_size>resume_after)? resume_after : oai_coll_size;
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212 | if (params.getLength() > 1) {
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213 | //Bad argument. Can't be more than one parameters for ListMetadataFormats verb
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214 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
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215 | }
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216 | if(params.getLength() == 0) {
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217 | //this is requesting a list of sets in the whole repository
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218 | /** there is no resumeptionToken in the request, we check whether we need
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219 | * to send out resumeptionToken by comparing the total number of sets in this
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220 | * repository and the specified value of resumeAfter
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221 | */
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222 | if(resume_after < 0 || oai_coll_size <= resume_after) {
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223 | //send the whole list of records
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224 | //all data are sent on the first request. Therefore there should be
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225 | //no resumeptionToken stored in OAIConfig.xml.
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226 | //As long as the verb is 'ListSets', we ignore the rest of the parameters
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227 | getSets(list_sets_elem, oai_coll, 0, oai_coll_size);
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228 | return getMessage(list_sets_elem);
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229 | }
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230 |
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231 | //append required sets to list_sets_elem (may be a complete or incomplete list)
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232 | getSets(list_sets_elem, oai_coll, 0, smaller);
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233 |
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234 | if(oai_coll_size > resume_after) {
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235 | //An incomplete list is sent; append a resumptionToken element
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236 | Element token = createResumptionTokenElement(oai_coll_size, 0, resume_after, true);
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237 | //store this token
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238 | OAIXML.addToken(token);
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239 |
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240 | list_sets_elem.appendChild(token);
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241 | }
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242 |
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243 | return getMessage(list_sets_elem);
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244 | }
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245 |
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246 | // The url should contain only one param called resumptionToken
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247 | // This is requesting a subsequent part of a list, following a previously sent incomplete list
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248 | param = (Element)params.item(0);
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249 | String param_name = param.getAttribute(OAIXML.NAME);
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250 | if (!param_name.equals(OAIXML.RESUMPTION_TOKEN)) {
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251 | //Bad argument
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252 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
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253 | }
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254 | //get the token
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255 | String token = param.getAttribute(OAIXML.VALUE);
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256 | //validate the token string (the string has already been decoded in OAIServer, e.g.,
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257 | // replace %3A with ':')
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258 | if(OAIXML.containsToken(token) == false) {
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259 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_RESUMPTION_TOKEN, ""));
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260 | }
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261 | //take out the cursor value, which is the size of previously sent list
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262 | int index = token.indexOf(":");
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263 | int cursor = Integer.parseInt(token.substring(index + 1));
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264 | Element token_elem = null;
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265 |
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266 | // are we sending the final part of a complete list?
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267 | if(cursor + resume_after >= oai_coll_size) {
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268 | //Yes, we are.
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269 | //append required sets to list_sets_elem (list is complete)
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270 | getSets(list_sets_elem, oai_coll, cursor, oai_coll_size);
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271 | //An incomplete list is sent; append a resumptionToken element
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272 | token_elem = createResumptionTokenElement(oai_coll_size, cursor, -1, false);
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273 | list_sets_elem.appendChild(token_elem);
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274 | } else {
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275 | //No, we are not.
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276 | //append required sets to list_sets_elem (list is incomplete)
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277 | getSets(list_sets_elem, oai_coll, cursor, cursor + resume_after);
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278 | token_elem = createResumptionTokenElement(oai_coll_size, cursor, cursor + resume_after, true);
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279 | //store this token
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280 | OAIXML.addToken(token_elem);
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281 | list_sets_elem.appendChild(token_elem);
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282 | }
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283 | return getMessage(list_sets_elem);
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284 | }
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285 | private Element createResumptionTokenElement(int total_size, int cursor, int so_far_sent, boolean set_expiration) {
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286 | Element token = OAIXML.createElement(OAIXML.RESUMPTION_TOKEN);
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287 | token.setAttribute(OAIXML.COMPLETE_LIST_SIZE, "" + total_size);
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288 | token.setAttribute(OAIXML.CURSOR, "" + cursor);
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289 |
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290 | if(set_expiration) {
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291 | /** read the resumptionTokenExpiration element in OAIConfig.xml and get the specified time value
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292 | * Use the time value plus the current system time to get the expiration date string.
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293 | */
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294 | String expiration_date = OAIXML.getTime(System.currentTimeMillis() + OAIXML.getTokenExpiration());
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295 | token.setAttribute(OAIXML.EXPIRATION_DATE, expiration_date);
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296 | }
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297 |
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298 | if(so_far_sent > 0) {
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299 | //the format of resumptionToken is not defined by the OAI-PMH and should be
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300 | //considered opaque by the harvester (in other words, strictly follow what the
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301 | //data provider has to offer
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302 | //Here, we make use of the uniqueness of the system time
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303 | GSXML.setNodeText(token, OAIXML.GS3OAI + System.currentTimeMillis() + ":" + so_far_sent);
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304 | }
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305 | return token;
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306 | }
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307 | /** if the param_map contains strings other than those in valid_strs, return false;
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308 | * otherwise true.
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309 | */
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310 | private boolean isValidParam(HashMap param_map, HashSet valid_strs) {
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311 | ArrayList param_list = new ArrayList(param_map.keySet());
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312 | for(int i=0; i<param_list.size(); i++) {
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313 | if (valid_strs.contains((String)param_list.get(i)) == false) {
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314 | return false;
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315 | }
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316 | }
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317 | return true;
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318 | }
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319 | private Element doListIdentifiers(Element msg) {
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320 | // option: from, until, set, metadataPrefix, resumptionToken
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321 | // exceptions: badArgument, badResumptionToken, cannotDisseminateFormat, noRecordMatch, and noSetHierarchy
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322 | HashSet valid_strs = new HashSet();
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323 | valid_strs.add(OAIXML.FROM);
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324 | valid_strs.add(OAIXML.UNTIL);
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325 | valid_strs.add(OAIXML.SET);
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326 | valid_strs.add(OAIXML.METADATA_PREFIX);
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327 | valid_strs.add(OAIXML.RESUMPTION_TOKEN);
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328 |
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329 | Element list_identifiers = OAIXML.createElement(OAIXML.LIST_IDENTIFIERS);
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330 | Element req = (Element)GSXML.getChildByTagName(msg, GSXML.REQUEST_ELEM);
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331 | if (req == null) { logger.error("req is null"); return null; }
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332 | NodeList params = GSXML.getChildrenByTagName(req, OAIXML.PARAM);
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333 | String coll_name = "";
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334 | String token = "";
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335 |
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336 | HashMap param_map = OAIXML.getParamMap(params);
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337 | if (!isValidParam(param_map, valid_strs) ||
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338 | !param_map.containsKey(OAIXML.METADATA_PREFIX)) {
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339 | logger.error("contains invalid params or no metadataPrefix");
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340 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
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341 | }
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342 | //ask the message router for a list of oai collections
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343 | NodeList oai_coll = getOAICollectionList();
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344 | int oai_coll_size = oai_coll.getLength();
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345 | if (oai_coll_size == 0) {
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346 | logger.info("returned oai collection list is empty");
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347 | return getMessage(OAIXML.createErrorElement(OAIXML.NO_RECORDS_MATCH, ""));
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348 | }
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349 | //Now that we got a prefix, check and see if it's supported by this repository
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350 | String prefix_value = (String)param_map.get(OAIXML.METADATA_PREFIX);
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351 | if (containsMetadataPrefix(prefix_value) == false) {
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352 | logger.error("requested prefix is not found in OAIConfig.xml");
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353 | return getMessage(OAIXML.createErrorElement(OAIXML.CANNOT_DISSEMINATE_FORMAT, ""));
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354 | }
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355 |
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356 | //Now we check if the optional argument 'set' has been specified in the params; if so,
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357 | //whether the specified setSpec is supported by this repository
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358 | boolean request_set = param_map.containsKey(OAIXML.SET);
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359 | if(request_set == true) {
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360 | boolean set_supported = false;
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361 | String set_spec_str = (String)param_map.get(OAIXML.SET);
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362 | // get the collection name
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363 | //if setSpec is supported by this repository, it must be in the form: site_name:coll_name
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364 | String[] strs = splitSetSpec(set_spec_str);
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365 | coll_name = strs[1];
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366 |
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367 | for(int i=0; i<oai_coll_size; i++) {
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368 | if(set_spec_str.equals(((Element)oai_coll.item(i)).getAttribute(OAIXML.NAME))) {
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369 | set_supported = true;
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370 | }
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371 | }
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372 | if(set_supported == false) {
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373 | logger.error("requested set is not found in this repository");
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374 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
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375 | }
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376 | }
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377 |
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378 | //Is there a resumptionToken included which is requesting an incomplete list?
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379 | if(param_map.containsKey(OAIXML.RESUMPTION_TOKEN)) {
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380 | // validate resumptionToken
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381 | token = (String)param_map.get(OAIXML.RESUMPTION_TOKEN);
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382 | logger.info("has resumptionToken" + token);
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383 | if(OAIXML.containsToken(token) == false) {
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384 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_RESUMPTION_TOKEN, ""));
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385 | }
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386 | }
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387 |
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388 | //Now that all validation has been done, I hope, we can send request to the message router
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389 | Element result = null;
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390 | String verb = req.getAttribute(OAIXML.TO);
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391 | NodeList param_list = req.getElementsByTagName(OAIXML.PARAM);
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392 | ArrayList retain_param_list = new ArrayList();
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393 | for (int j=0; j<param_list.getLength(); j++) {
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394 | Element e = OAIXML.duplicateElement(msg.getOwnerDocument(), (Element)param_list.item(j), true);
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395 | retain_param_list.add(e);
|
---|
396 | }
|
---|
397 |
|
---|
398 | //re-organize the request element
|
---|
399 | // reset the 'to' attribute
|
---|
400 | if (request_set == false) {
|
---|
401 | logger.info("requesting identifiers of all collections");
|
---|
402 | for(int i=0; i<oai_coll_size; i++) {
|
---|
403 | if(req == null) {
|
---|
404 | req = msg.getOwnerDocument().createElement(GSXML.REQUEST_ELEM);
|
---|
405 | msg.appendChild(req);
|
---|
406 | for (int j=0; j<retain_param_list.size(); j++) {
|
---|
407 | req.appendChild((Element)retain_param_list.get(j));
|
---|
408 | }
|
---|
409 | }
|
---|
410 | String full_name = ((Element)oai_coll.item(i)).getAttribute(OAIXML.NAME);
|
---|
411 | coll_name = full_name.substring(full_name.indexOf(":") + 1);
|
---|
412 | req.setAttribute(OAIXML.TO, coll_name + "/" + verb);
|
---|
413 | Element e = mr.process(msg);
|
---|
414 | result = collectAll(result, e, verb, OAIXML.HEADER);
|
---|
415 |
|
---|
416 | //clear the content of the old request element
|
---|
417 | msg.removeChild(req);
|
---|
418 | req = null;
|
---|
419 | }
|
---|
420 | } else {
|
---|
421 | req.setAttribute(OAIXML.TO, coll_name + "/" + verb);
|
---|
422 | result = mr.process(msg);
|
---|
423 | }
|
---|
424 |
|
---|
425 | if (result == null) {
|
---|
426 | logger.info("message router returns null");
|
---|
427 | return getMessage(OAIXML.createErrorElement("Internal service returns null", ""));
|
---|
428 | }
|
---|
429 | Element res = (Element)GSXML.getChildByTagName(result, OAIXML.RESPONSE);
|
---|
430 | if(res == null) {
|
---|
431 | logger.info("response element in xml_result is null");
|
---|
432 | return getMessage(OAIXML.createErrorElement("Internal service returns null", ""));
|
---|
433 | }
|
---|
434 | NodeList header_list = res.getElementsByTagName(OAIXML.HEADER);
|
---|
435 | int num_headers = header_list.getLength();
|
---|
436 | if(num_headers == 0) {
|
---|
437 | logger.info("message router returns 0 headers.");
|
---|
438 | return getMessage(OAIXML.createErrorElement(OAIXML.NO_RECORDS_MATCH, ""));
|
---|
439 | }
|
---|
440 |
|
---|
441 | //The request coming in does not contain a token, but we have to check the resume_after value and see if we need to issue a resumption token and
|
---|
442 | // save the token as well.
|
---|
443 | if (token.equals("") == true) {
|
---|
444 | if(resume_after < 0 || num_headers <= resume_after) {
|
---|
445 | //send the whole list of records
|
---|
446 | return result;
|
---|
447 | }
|
---|
448 |
|
---|
449 | //append required number of records (may be a complete or incomplete list)
|
---|
450 | getRecords(list_identifiers, header_list, 0, resume_after);
|
---|
451 | //An incomplete list is sent; append a resumptionToken element
|
---|
452 | Element token_elem = createResumptionTokenElement(num_headers, 0, resume_after, true);
|
---|
453 | //store this token
|
---|
454 | OAIXML.addToken(token_elem);
|
---|
455 |
|
---|
456 | list_identifiers.appendChild(token_elem);
|
---|
457 | return getMessage(list_identifiers);
|
---|
458 | }
|
---|
459 |
|
---|
460 | if (token.equals("") == false) {
|
---|
461 | //get an appropriate number of records (partial list) according to the token
|
---|
462 | //take out the cursor value, which is the size of previously sent list
|
---|
463 | int index = token.indexOf(":");
|
---|
464 | int cursor = Integer.parseInt(token.substring(index + 1));
|
---|
465 | Element token_elem = null;
|
---|
466 |
|
---|
467 | // are we sending the final part of a complete list?
|
---|
468 | if(cursor + resume_after >= num_headers) {
|
---|
469 | //Yes, we are.
|
---|
470 | //append required records to list_records (list is complete)
|
---|
471 | getRecords(list_identifiers, header_list, cursor, num_headers);
|
---|
472 | //An incomplete list is sent; append a resumptionToken element
|
---|
473 | token_elem = createResumptionTokenElement(num_headers, cursor, -1, false);
|
---|
474 | list_identifiers.appendChild(token_elem);
|
---|
475 | } else {
|
---|
476 | //No, we are not.
|
---|
477 | //append required records to list_records (list is incomplete)
|
---|
478 | getRecords(list_identifiers, header_list, cursor, cursor + resume_after);
|
---|
479 | token_elem = createResumptionTokenElement(num_headers, cursor, cursor + resume_after, true);
|
---|
480 | //store this token
|
---|
481 | OAIXML.addToken(token_elem);
|
---|
482 | list_identifiers.appendChild(token_elem);
|
---|
483 | }
|
---|
484 |
|
---|
485 | return getMessage(list_identifiers);
|
---|
486 | }//end of if(!token.equals(""))
|
---|
487 |
|
---|
488 | return result;
|
---|
489 | }
|
---|
490 | private Element doListRecords(Element msg){
|
---|
491 | logger.info("");
|
---|
492 | // option: from, until, set, metadataPrefix, and resumptionToken
|
---|
493 | // exceptions: badArgument, badResumptionToken, cannotDisseminateFormat, noRecordMatch, and noSetHierarchy
|
---|
494 | HashSet valid_strs = new HashSet();
|
---|
495 | valid_strs.add(OAIXML.FROM);
|
---|
496 | valid_strs.add(OAIXML.UNTIL);
|
---|
497 | valid_strs.add(OAIXML.SET);
|
---|
498 | valid_strs.add(OAIXML.METADATA_PREFIX);
|
---|
499 | valid_strs.add(OAIXML.RESUMPTION_TOKEN);
|
---|
500 |
|
---|
501 | Element list_records = OAIXML.createElement(OAIXML.LIST_RECORDS);
|
---|
502 | Element req = (Element)GSXML.getChildByTagName(msg, GSXML.REQUEST_ELEM);
|
---|
503 | if (req == null) { logger.error("req is null"); return null; }
|
---|
504 | NodeList params = GSXML.getChildrenByTagName(req, OAIXML.PARAM);
|
---|
505 |
|
---|
506 | String coll_name = "";
|
---|
507 | String token = "";
|
---|
508 |
|
---|
509 | if(params.getLength() == 0) {
|
---|
510 | logger.error("must at least have the metadataPrefix parameter, can't be none");
|
---|
511 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
512 | }
|
---|
513 |
|
---|
514 | HashMap param_map = OAIXML.getParamMap(params);
|
---|
515 | if (!isValidParam(param_map, valid_strs) ||
|
---|
516 | !param_map.containsKey(OAIXML.METADATA_PREFIX)) {
|
---|
517 | // it must have a metadataPrefix
|
---|
518 | /** Here I disagree with the OAI specification: even if a resumptionToken is
|
---|
519 | * included in the request, the metadataPrefix is a must argument. Otherwise
|
---|
520 | * how would we know what metadataPrefix the harvester requested in his last request?
|
---|
521 | */
|
---|
522 | logger.error("no metadataPrefix");
|
---|
523 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
524 | }
|
---|
525 |
|
---|
526 | //ask the message router for a list of oai collections
|
---|
527 | NodeList oai_coll = getOAICollectionList();
|
---|
528 | int oai_coll_size = oai_coll.getLength();
|
---|
529 | if (oai_coll_size == 0) {
|
---|
530 | logger.info("returned oai collection list is empty");
|
---|
531 | return getMessage(OAIXML.createErrorElement(OAIXML.NO_RECORDS_MATCH, ""));
|
---|
532 | }
|
---|
533 |
|
---|
534 | //Now that we got a prefix, check and see if it's supported by this repository
|
---|
535 | String prefix_value = (String)param_map.get(OAIXML.METADATA_PREFIX);
|
---|
536 | if (containsMetadataPrefix(prefix_value) == false) {
|
---|
537 | logger.error("requested prefix is not found in OAIConfig.xml");
|
---|
538 | return getMessage(OAIXML.createErrorElement(OAIXML.CANNOT_DISSEMINATE_FORMAT, ""));
|
---|
539 | }
|
---|
540 |
|
---|
541 | //Now we check if the optional argument 'set' has been specified in the params; if so,
|
---|
542 | //whether the specified setSpec is supported by this repository
|
---|
543 | boolean request_set = param_map.containsKey(OAIXML.SET);
|
---|
544 | if(request_set == true) {
|
---|
545 | boolean set_supported = false;
|
---|
546 | String set_spec_str = (String)param_map.get(OAIXML.SET);
|
---|
547 | // get the collection name
|
---|
548 | //if setSpec is supported by this repository, it must be in the form: site_name:coll_name
|
---|
549 | String[] strs = splitSetSpec(set_spec_str);
|
---|
550 | // name_of_site = strs[0];
|
---|
551 | coll_name = strs[1];
|
---|
552 | //logger.info("param contains set: "+coll_name);
|
---|
553 |
|
---|
554 | for(int i=0; i<oai_coll_size; i++) {
|
---|
555 | if(set_spec_str.equals(((Element)oai_coll.item(i)).getAttribute(OAIXML.NAME))) {
|
---|
556 | set_supported = true;
|
---|
557 | }
|
---|
558 | }
|
---|
559 | if(set_supported == false) {
|
---|
560 | logger.error("requested set is not found in this repository");
|
---|
561 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
562 | }
|
---|
563 | }
|
---|
564 |
|
---|
565 | //Is there a resumptionToken included which is requesting an incomplete list?
|
---|
566 | if(param_map.containsKey(OAIXML.RESUMPTION_TOKEN)) {
|
---|
567 | // validate resumptionToken
|
---|
568 | //if (the token value is not found in the token xml file) {
|
---|
569 | // return getMessage(OAIXML.createErrorElement(OAIXML.BAD_RESUMPTION_TOKEN, ""));
|
---|
570 | //} else {
|
---|
571 | // use the request to get a complete list of records from the message router
|
---|
572 | // and issue the subsequent part of that complete list according to the token.
|
---|
573 | // store a new token if necessary.
|
---|
574 | //}
|
---|
575 | token = (String)param_map.get(OAIXML.RESUMPTION_TOKEN);
|
---|
576 | logger.info("has resumptionToken" + token);
|
---|
577 | if(OAIXML.containsToken(token) == false) {
|
---|
578 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_RESUMPTION_TOKEN, ""));
|
---|
579 | }
|
---|
580 | }
|
---|
581 | //Now that all validation has been done, I hope, we can send request to the message router
|
---|
582 | Element result = null;
|
---|
583 | String verb = req.getAttribute(OAIXML.TO);
|
---|
584 | NodeList param_list = req.getElementsByTagName(OAIXML.PARAM);
|
---|
585 | ArrayList retain_param_list = new ArrayList();
|
---|
586 | for (int j=0; j<param_list.getLength(); j++) {
|
---|
587 | Element e = OAIXML.duplicateElement(msg.getOwnerDocument(), (Element)param_list.item(j), true);
|
---|
588 | retain_param_list.add(e);
|
---|
589 | }
|
---|
590 |
|
---|
591 | //re-organize the request element
|
---|
592 | // reset the 'to' attribute
|
---|
593 | if (request_set == false) {
|
---|
594 | //coll_name could be "", which means it's requesting all records of all collections
|
---|
595 | //we send a request to each collection asking for its records
|
---|
596 | for(int i=0; i<oai_coll_size; i++) {
|
---|
597 | if(req == null) {
|
---|
598 | req = msg.getOwnerDocument().createElement(GSXML.REQUEST_ELEM);
|
---|
599 | msg.appendChild(req);
|
---|
600 | for (int j=0; j<retain_param_list.size(); j++) {
|
---|
601 | req.appendChild((Element)retain_param_list.get(j));
|
---|
602 | }
|
---|
603 | }
|
---|
604 | String full_name = ((Element)oai_coll.item(i)).getAttribute(OAIXML.NAME);
|
---|
605 | coll_name = full_name.substring(full_name.indexOf(":") + 1);
|
---|
606 | req.setAttribute(OAIXML.TO, coll_name + "/" + verb);
|
---|
607 | //logger.info(GSXML.xmlNodeToString(req));
|
---|
608 | Element e = mr.process(msg);
|
---|
609 | result = collectAll(result, e, verb, OAIXML.RECORD);
|
---|
610 |
|
---|
611 | //clear the content of the old request element
|
---|
612 | msg.removeChild(req);
|
---|
613 | req = null;
|
---|
614 | }
|
---|
615 | } else {
|
---|
616 | req.setAttribute(OAIXML.TO, coll_name + "/" + verb);
|
---|
617 | result = mr.process(msg);
|
---|
618 | }
|
---|
619 |
|
---|
620 | if (result == null) {
|
---|
621 | logger.info("message router returns null");
|
---|
622 | return getMessage(OAIXML.createErrorElement("Internal service returns null", ""));
|
---|
623 | }
|
---|
624 | Element res = (Element)GSXML.getChildByTagName(result, OAIXML.RESPONSE);
|
---|
625 | if(res == null) {
|
---|
626 | logger.info("response element in xml_result is null");
|
---|
627 | return getMessage(OAIXML.createErrorElement("Internal service returns null", ""));
|
---|
628 | }
|
---|
629 | NodeList record_list = res.getElementsByTagName(OAIXML.RECORD);
|
---|
630 | int num_records = record_list.getLength();
|
---|
631 | if(num_records == 0) {
|
---|
632 | logger.info("message router returns 0 records.");
|
---|
633 | return getMessage(OAIXML.createErrorElement(OAIXML.NO_RECORDS_MATCH, ""));
|
---|
634 | }
|
---|
635 |
|
---|
636 | //The request coming in does not contain a token, but we have to check the resume_after value and see if we need to issue a resumption token and
|
---|
637 | // save the token as well.
|
---|
638 | if (token.equals("") == true) {
|
---|
639 | if(resume_after < 0 || num_records <= resume_after) {
|
---|
640 | //send the whole list of records
|
---|
641 | return result;
|
---|
642 | }
|
---|
643 |
|
---|
644 | //append required number of records (may be a complete or incomplete list)
|
---|
645 | getRecords(list_records, record_list, 0, resume_after);
|
---|
646 | //An incomplete list is sent; append a resumptionToken element
|
---|
647 | Element token_elem = createResumptionTokenElement(num_records, 0, resume_after, true);
|
---|
648 | //store this token
|
---|
649 | OAIXML.addToken(token_elem);
|
---|
650 |
|
---|
651 | list_records.appendChild(token_elem);
|
---|
652 | return getMessage(list_records);
|
---|
653 | }
|
---|
654 |
|
---|
655 | if (token.equals("") == false) {
|
---|
656 | //get an appropriate number of records (partial list) according to the token
|
---|
657 | //take out the cursor value, which is the size of previously sent list
|
---|
658 | int index = token.indexOf(":");
|
---|
659 | int cursor = Integer.parseInt(token.substring(index + 1));
|
---|
660 | Element token_elem = null;
|
---|
661 |
|
---|
662 | // are we sending the final part of a complete list?
|
---|
663 | if(cursor + resume_after >= num_records) {
|
---|
664 | //Yes, we are.
|
---|
665 | //append required records to list_records (list is complete)
|
---|
666 | getRecords(list_records, record_list, cursor, num_records);
|
---|
667 | //An incomplete list is sent; append a resumptionToken element
|
---|
668 | token_elem = createResumptionTokenElement(num_records, cursor, -1, false);
|
---|
669 | list_records.appendChild(token_elem);
|
---|
670 | } else {
|
---|
671 | //No, we are not.
|
---|
672 | //append required records to list_records (list is incomplete)
|
---|
673 | getRecords(list_records, record_list, cursor, cursor + resume_after);
|
---|
674 | token_elem = createResumptionTokenElement(num_records, cursor, cursor + resume_after, true);
|
---|
675 | //store this token
|
---|
676 | OAIXML.addToken(token_elem);
|
---|
677 | list_records.appendChild(token_elem);
|
---|
678 | }
|
---|
679 |
|
---|
680 | return getMessage(list_records);
|
---|
681 | }//end of if(!token.equals(""))
|
---|
682 |
|
---|
683 | return result;//a backup return
|
---|
684 | }
|
---|
685 | // method exclusively used by doListRecords/doListIdentifiers
|
---|
686 | private void getRecords(Element verb_elem, NodeList list, int start_point, int end_point) {
|
---|
687 | for (int i=start_point; i<end_point; i++) {
|
---|
688 | verb_elem.appendChild(verb_elem.getOwnerDocument().importNode(list.item(i), true));
|
---|
689 | }
|
---|
690 | }
|
---|
691 | private Element collectAll(Element result, Element msg, String verb, String elem_name) {
|
---|
692 | if(result == null) {
|
---|
693 | //in the first round, result is null
|
---|
694 | return msg;
|
---|
695 | }
|
---|
696 | Element res_in_result = (Element)GSXML.getChildByTagName(result, OAIXML.RESPONSE);
|
---|
697 | Element verb_elem = (Element)GSXML.getChildByTagName(res_in_result, verb);
|
---|
698 | if(msg == null) {
|
---|
699 | return result;
|
---|
700 | }
|
---|
701 |
|
---|
702 | //e.g., get all <record> elements from the returned message. There may be none of
|
---|
703 | //such element, for example, the collection service returned an error message
|
---|
704 | NodeList elem_list = msg.getElementsByTagName(elem_name);
|
---|
705 |
|
---|
706 | for (int i=0; i<elem_list.getLength(); i++) {
|
---|
707 | verb_elem.appendChild(res_in_result.getOwnerDocument().importNode(elem_list.item(i), true));
|
---|
708 | }
|
---|
709 | return result;
|
---|
710 | }
|
---|
711 | /** there are three possible exception conditions: bad argument, idDoesNotExist, and noMetadataFormats.
|
---|
712 | * The first one is handled here, and the last two are processed by OAIPMH.
|
---|
713 | */
|
---|
714 | private Element doListMetadataFormats(Element msg) {
|
---|
715 | //if the verb is ListMetadataFormats, there could be only one parameter: identifier
|
---|
716 | //, or there is no parameter; otherwise it is an error
|
---|
717 | //logger.info("" + this.converter.getString(msg));
|
---|
718 |
|
---|
719 | Element list_metadata_formats = OAIXML.createElement(OAIXML.LIST_METADATA_FORMATS);
|
---|
720 |
|
---|
721 | Element req = (Element)GSXML.getChildByTagName(msg, GSXML.REQUEST_ELEM);
|
---|
722 | if (req == null) { logger.error(""); return null; }
|
---|
723 | NodeList params = GSXML.getChildrenByTagName(req, OAIXML.PARAM);
|
---|
724 | Element param = null;
|
---|
725 | if(params.getLength() == 0) {
|
---|
726 | //this is requesting metadata formats for the whole repository
|
---|
727 | //read the oaiConfig.xml file, return the metadata formats specified there.
|
---|
728 | Element oai_config = OAIXML.getOAIConfigXML();
|
---|
729 | if (oai_config == null) {
|
---|
730 | return getMessage(OAIXML.createErrorElement(OAIXML.ERROR, OAIXML.SERVICE_UNAVAILABLE));
|
---|
731 | } else {
|
---|
732 | Element format_list = (Element)GSXML.getChildByTagName(oai_config, OAIXML.LIST_METADATA_FORMATS);
|
---|
733 | if(format_list == null) {
|
---|
734 | logger.error("OAIConfig.xml must contain the supported metadata formats");
|
---|
735 | return getMessage(list_metadata_formats);
|
---|
736 | }
|
---|
737 | NodeList formats = format_list.getElementsByTagName(OAIXML.METADATA_FORMAT);
|
---|
738 | for(int i=0; i<formats.getLength(); i++) {
|
---|
739 | Element meta_fmt = OAIXML.createElement(OAIXML.METADATA_FORMAT);
|
---|
740 | Element first_meta_format = (Element)formats.item(i);
|
---|
741 | //the element also contains mappings, but we don't want them
|
---|
742 | meta_fmt.appendChild(meta_fmt.getOwnerDocument().importNode(GSXML.getChildByTagName(first_meta_format, OAIXML.METADATA_PREFIX), true));
|
---|
743 | meta_fmt.appendChild(meta_fmt.getOwnerDocument().importNode(GSXML.getChildByTagName(first_meta_format, OAIXML.SCHEMA), true));
|
---|
744 | meta_fmt.appendChild(meta_fmt.getOwnerDocument().importNode(GSXML.getChildByTagName(first_meta_format, OAIXML.METADATA_NAMESPACE), true));
|
---|
745 | list_metadata_formats.appendChild(meta_fmt);
|
---|
746 | }
|
---|
747 | return getMessage(list_metadata_formats);
|
---|
748 | }
|
---|
749 |
|
---|
750 | } else if (params.getLength() > 1) {
|
---|
751 | //Bad argument. Can't be more than one parameters for ListMetadataFormats verb
|
---|
752 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
753 | } else {
|
---|
754 | // This is a request for the metadata of a particular item with an identifier
|
---|
755 | /**the request xml is in the form: <request>
|
---|
756 | * <param name=.../>
|
---|
757 | * </request>
|
---|
758 | *And there is a param element and one element only. (No paramList element in between).
|
---|
759 | */
|
---|
760 | param = (Element)params.item(0);
|
---|
761 | String param_name = param.getAttribute(OAIXML.NAME);
|
---|
762 | String identifier = "";
|
---|
763 | if (!param_name.equals(OAIXML.IDENTIFIER)) {
|
---|
764 | //Bad argument
|
---|
765 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
766 | } else {
|
---|
767 | identifier = param.getAttribute(OAIXML.VALUE);
|
---|
768 | // the identifier is in the form: <site_name>:<coll_name>:<OID>
|
---|
769 | // so it must contain at least two ':' characters
|
---|
770 | String[] strs = identifier.split(":");
|
---|
771 | if(strs == null || strs.length < 3) {
|
---|
772 | // the OID may also contain ':'
|
---|
773 | logger.error("identifier is not in the form site:coll:id" + identifier);
|
---|
774 | return getMessage(OAIXML.createErrorElement(OAIXML.ID_DOES_NOT_EXIST, ""));
|
---|
775 | }
|
---|
776 |
|
---|
777 | // send request to message router
|
---|
778 | // get the names
|
---|
779 | strs = splitNames(identifier);
|
---|
780 | String name_of_site = strs[0];
|
---|
781 | String coll_name = strs[1];
|
---|
782 | String oid = strs[2];
|
---|
783 |
|
---|
784 | //re-organize the request element
|
---|
785 | // reset the 'to' attribute
|
---|
786 | String verb = req.getAttribute(OAIXML.TO);
|
---|
787 | req.setAttribute(OAIXML.TO, coll_name + "/" + verb);
|
---|
788 | // reset the identifier element
|
---|
789 | param.setAttribute(OAIXML.NAME, OAIXML.OID);
|
---|
790 | param.setAttribute(OAIXML.VALUE, oid);
|
---|
791 |
|
---|
792 | //Now send the request to the message router to process
|
---|
793 | return mr.process(msg);
|
---|
794 | }
|
---|
795 | }
|
---|
796 |
|
---|
797 | }
|
---|
798 | private void appendParam(Element req, String name, String value) {
|
---|
799 | Element param = req.getOwnerDocument().createElement(OAIXML.PARAM);
|
---|
800 | param.setAttribute(OAIXML.NAME, name);
|
---|
801 | param.setAttribute(OAIXML.VALUE, value);
|
---|
802 | req.appendChild(param);
|
---|
803 | }
|
---|
804 | private void copyElement(Element identify, String tag_name) {
|
---|
805 | Element from_repository_name = (Element)GSXML.getChildByTagName(oai_config, tag_name);
|
---|
806 | if(from_repository_name != null) {
|
---|
807 | Element this_repository_name = OAIXML.createElement(tag_name);
|
---|
808 | GSXML.setNodeText(this_repository_name, GSXML.getNodeText(from_repository_name));
|
---|
809 | identify.appendChild(this_repository_name);
|
---|
810 | }
|
---|
811 | }
|
---|
812 | private Element doIdentify() {
|
---|
813 | //The validation for this verb has been done in OAIServer.validate(). So no bother here.
|
---|
814 | logger.info("");
|
---|
815 |
|
---|
816 | Element identify = OAIXML.createElement(OAIXML.IDENTIFY);
|
---|
817 | //do the repository name
|
---|
818 | copyElement(identify, OAIXML.REPOSITORY_NAME);
|
---|
819 | //do the baseurl
|
---|
820 | copyElement(identify, OAIXML.BASE_URL);
|
---|
821 | //do the protocol version
|
---|
822 | copyElement(identify, OAIXML.PROTOCOL_VERSION);
|
---|
823 | //do the deletedRecord
|
---|
824 | copyElement(identify, OAIXML.DELETED_RECORD);
|
---|
825 | //do the granularity
|
---|
826 | copyElement(identify, OAIXML.GRANULARITY);
|
---|
827 |
|
---|
828 | //There can be more than one admin email according to the OAI specification
|
---|
829 | NodeList admin_emails = GSXML.getChildrenByTagName(oai_config, OAIXML.ADMIN_EMAIL);
|
---|
830 | int num_admin = 0;
|
---|
831 | Element from_admin_email = null;
|
---|
832 | if (admin_emails != null) {
|
---|
833 | num_admin = admin_emails.getLength();
|
---|
834 | }
|
---|
835 | for (int i=0; i<num_admin; i++) {
|
---|
836 | copyElement(identify, OAIXML.ADMIN_EMAIL);
|
---|
837 | }
|
---|
838 |
|
---|
839 | //do the earliestDatestamp
|
---|
840 | long lastmodified = System.currentTimeMillis();
|
---|
841 | //send request to mr to search through the earliest datestamp amongst all oai collections in the repository.
|
---|
842 | //ask the message router for a list of oai collections
|
---|
843 | NodeList oai_coll = getOAICollectionList();
|
---|
844 | int oai_coll_size = oai_coll.getLength();
|
---|
845 | if (oai_coll_size == 0) {
|
---|
846 | logger.info("returned oai collection list is empty. Set repository earliestDatestamp to be 1970-01-01.");
|
---|
847 | lastmodified = 0;
|
---|
848 | }
|
---|
849 | //the collection build time is determined by the last modified time of the buildConfig.xml file
|
---|
850 | for(int i=0; i<oai_coll_size; i++) {
|
---|
851 | long coll_build_time = Long.parseLong(((Element)oai_coll.item(i)).getAttribute(OAIXML.LASTMODIFIED));
|
---|
852 | lastmodified = (lastmodified > coll_build_time)? coll_build_time : lastmodified;
|
---|
853 | }
|
---|
854 | String earliestDatestamp_str = OAIXML.getTime(lastmodified);
|
---|
855 | Element earliestDatestamp_elem = OAIXML.createElement(OAIXML.EARLIEST_DATESTAMP);
|
---|
856 | GSXML.setNodeText(earliestDatestamp_elem, earliestDatestamp_str);
|
---|
857 | identify.appendChild(earliestDatestamp_elem);
|
---|
858 |
|
---|
859 | return getMessage(identify);
|
---|
860 | }
|
---|
861 | //split setSpec (site_name:coll_name) into an array of strings
|
---|
862 | //It has already been checked that the set_spec contains at least one ':'
|
---|
863 | private String[] splitSetSpec(String set_spec) {
|
---|
864 | logger.info(set_spec);
|
---|
865 | String[] strs = new String[2];
|
---|
866 | int colon_index = set_spec.indexOf(":");
|
---|
867 | strs[0] = set_spec.substring(0, colon_index);
|
---|
868 | strs[1] = set_spec.substring(colon_index + 1);
|
---|
869 | return strs;
|
---|
870 | }
|
---|
871 | /** split the identifier into <site + collection + OID> as an array
|
---|
872 | It has already been checked that the 'identifier' contains at least two ':'
|
---|
873 | */
|
---|
874 | private String[] splitNames(String identifier) {
|
---|
875 | logger.info(identifier);
|
---|
876 | String [] strs = new String[3];
|
---|
877 | int first_colon = identifier.indexOf(":");
|
---|
878 | strs[0] = identifier.substring(0, first_colon);
|
---|
879 |
|
---|
880 | String sr = identifier.substring(first_colon + 1);
|
---|
881 | int second_colon = sr.indexOf(":");
|
---|
882 | //logger.error(first_colon + " " + second_colon);
|
---|
883 | strs[1] = sr.substring(0, second_colon);
|
---|
884 |
|
---|
885 | strs[2] = sr.substring(second_colon + 1);
|
---|
886 | return strs;
|
---|
887 | }
|
---|
888 | /** validate if the specified metadata prefix value is supported by the repository
|
---|
889 | * by checking it in the OAIConfig.xml
|
---|
890 | */
|
---|
891 | private boolean containsMetadataPrefix(String prefix_value) {
|
---|
892 | NodeList prefix_list = oai_config.getElementsByTagName(OAIXML.METADATA_PREFIX);
|
---|
893 |
|
---|
894 | for(int i=0; i<prefix_list.getLength(); i++) {
|
---|
895 | if(prefix_value.equals(GSXML.getNodeText((Element)prefix_list.item(i)).trim() )) {
|
---|
896 | return true;
|
---|
897 | }
|
---|
898 | }
|
---|
899 | return false;
|
---|
900 | }
|
---|
901 | private Element doGetRecord(Element msg){
|
---|
902 | logger.info("");
|
---|
903 | /** arguments:
|
---|
904 | identifier: required
|
---|
905 | metadataPrefix: required
|
---|
906 | * Exceptions: badArgument; cannotDisseminateFormat; idDoesNotExist
|
---|
907 | */
|
---|
908 | Element get_record = OAIXML.createElement(OAIXML.GET_RECORD);
|
---|
909 |
|
---|
910 | HashSet valid_strs = new HashSet();
|
---|
911 | valid_strs.add(OAIXML.IDENTIFIER);
|
---|
912 | valid_strs.add(OAIXML.METADATA_PREFIX);
|
---|
913 |
|
---|
914 | Element req = (Element)GSXML.getChildByTagName(msg, GSXML.REQUEST_ELEM);
|
---|
915 | NodeList params = GSXML.getChildrenByTagName(req, OAIXML.PARAM);
|
---|
916 | HashMap param_map = OAIXML.getParamMap(params);
|
---|
917 |
|
---|
918 | if(!isValidParam(param_map, valid_strs) ||
|
---|
919 | params.getLength() == 0 ||
|
---|
920 | param_map.containsKey(OAIXML.IDENTIFIER) == false ||
|
---|
921 | param_map.containsKey(OAIXML.METADATA_PREFIX) == false ) {
|
---|
922 | logger.error("must have the metadataPrefix/identifier parameter.");
|
---|
923 | return getMessage(OAIXML.createErrorElement(OAIXML.BAD_ARGUMENT, ""));
|
---|
924 | }
|
---|
925 |
|
---|
926 | String prefix = (String)param_map.get(OAIXML.METADATA_PREFIX);
|
---|
927 | String identifier = (String)param_map.get(OAIXML.IDENTIFIER);
|
---|
928 |
|
---|
929 | // verify the metadata prefix
|
---|
930 | if (containsMetadataPrefix(prefix) == false) {
|
---|
931 | logger.error("requested prefix is not found in OAIConfig.xml");
|
---|
932 | return getMessage(OAIXML.createErrorElement(OAIXML.CANNOT_DISSEMINATE_FORMAT, ""));
|
---|
933 | }
|
---|
934 |
|
---|
935 | // get the names
|
---|
936 | String[] strs = splitNames(identifier);
|
---|
937 | if(strs == null || strs.length < 3) {
|
---|
938 | logger.error("identifier is not in the form site:coll:id" + identifier);
|
---|
939 | return getMessage(OAIXML.createErrorElement(OAIXML.ID_DOES_NOT_EXIST, ""));
|
---|
940 | }
|
---|
941 | String name_of_site = strs[0];
|
---|
942 | String coll_name = strs[1];
|
---|
943 | String oid = strs[2];
|
---|
944 |
|
---|
945 | //re-organize the request element
|
---|
946 | // reset the 'to' attribute
|
---|
947 | String verb = req.getAttribute(OAIXML.TO);
|
---|
948 | req.setAttribute(OAIXML.TO, coll_name + "/" + verb);
|
---|
949 | // reset the identifier element
|
---|
950 | Element param = GSXML.getNamedElement(req, OAIXML.PARAM, OAIXML.NAME, OAIXML.IDENTIFIER);
|
---|
951 | if (param != null) {
|
---|
952 | param.setAttribute(OAIXML.NAME, OAIXML.OID);
|
---|
953 | param.setAttribute(OAIXML.VALUE, oid);
|
---|
954 | }
|
---|
955 |
|
---|
956 | //Now send the request to the message router to process
|
---|
957 | return mr.process(msg);
|
---|
958 | }
|
---|
959 | }
|
---|