1 | #include "abstractlistaction.h"
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2 | #include "recptprototools.h"
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3 |
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4 | #include "oaitools.h"
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5 |
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6 | //--------------------------------------------------------------------------------------------------
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7 |
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8 | bool abstractlistaction::output_content(ostream &output, recptproto *protocol, oaiargs ¶ms)
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9 | {
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10 | bool prevDocSeen;
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11 | ResumptionToken *token = NULL;
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12 |
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13 | // start the call; clear down the total number of output documents
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14 | this->outputDocs = 0;
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15 |
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16 | // We don't actually handle resumptionTokens yet; if we get one, ignore it
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17 | if (params["resumptionToken"] != "") {
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18 | token = new ResumptionToken(params["resumptionToken"]);
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19 | }
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20 |
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21 | this->replyToken = NULL;
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22 |
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23 | // if we've been asked for a set, then use it!
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24 | if (params["set"] != "") {
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25 | // get the children of this set
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26 | text_t gsdlSet = params["set"];
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27 | text_t gsdlCollect = "";
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28 |
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29 | // given 'demo:CL2', toGSDL returns 'demo' in gsdlCollect and 'CL2' in gsdlSet. If there is no further
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30 | // set specified after the name of the collection however, then gsdlSet is empty.
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31 | oaiclassifier::toGSDL(gsdlCollect, gsdlSet);
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32 |
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33 | // If gsdlSet is empty, then the user is requesting all the identifiers for the collection, so
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34 | // we simply output all docs via their oai_id tag. But if a specific subset IS requested, then
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35 | // use recurse_set() to traverse any sub classifiers to find the relevant docs.
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36 | if(gsdlSet == ""){
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37 | ColInfoResponse_t cinfo;
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38 | comerror_t err;
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39 | this->output_content_for_col(output, protocol, gsdlCollect, cinfo, err, params);
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40 | }
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41 | else {
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42 | if (this->check_classifier(protocol, gsdlCollect, gsdlSet)) {
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43 | this->recurse_set(output, protocol, gsdlCollect, gsdlSet, params, token);
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44 | }
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45 | }
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46 | }
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47 | // output all records in all hierarchies
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48 | else {
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49 | this->output_content_for_all(output, protocol, params);
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50 | }
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51 |
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52 | // If - regardless of set required - no documents have been seen, throw an error.
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53 | if (this->configuration->getOAIVersion() >= 200 && this->prevDocSeen == false) {
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54 | errorType = "noRecordsMatch";
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55 | this->output_error(output, errorType);
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56 |
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57 | return false;
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58 | }
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59 |
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60 | // do a resumption token if required; errors cancel a token...
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61 | if (this->replyToken != NULL && this->errorType == "") {
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62 | // Don't add any whitespace around the resumption token as it can confuse harvesters/validators
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63 | output << " <resumptionToken>" << this->replyToken->getToken() << "</resumptionToken>" << endl;
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64 | }
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65 |
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66 | return true;
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67 | }
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68 |
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69 | //--------------------------------------------------------------------------------------------------
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70 |
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71 | void abstractlistaction::output_content_for_col(ostream &output, recptproto *protocol, text_t &gsdlCollect,
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72 | ColInfoResponse_t &cinfo, comerror_t &err, oaiargs ¶ms)
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73 | { int startDoc = 0;
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74 |
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75 | text_t metadataPrefix = params["metadataPrefix"];
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76 |
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77 | // check resumption token
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78 | if (params["resumptionToken"] != "") {
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79 | ResumptionToken token(params["resumptionToken"]);
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80 | if (token.getCollection() == gsdlCollect) {
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81 | startDoc = token.getPosition() - 1; // first document is said to be 1..
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82 | metadataPrefix = "oai_dc"; // TO DO: This should come from the resumption token
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83 | }
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84 | }
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85 |
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86 | // Get the OAI nodes from the info db file
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87 | text_t oai_root_node = "oai";
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88 | text_tset metadata; // Must be empty for efficiency
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89 | FilterResponse_t response;
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90 | get_children(oai_root_node, gsdlCollect, "", metadata, false, protocol, response, *this->logout);
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91 |
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92 | // If numDocs is 0, do nothing - this->prevDocSeen will stay false if this is the only collection
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93 | // looked at, or will keep whatever value it had prior to this col (ensures that if the flag has
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94 | // been set to true by a previous collection that this won't overwrite it to be false).
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95 | if (response.docInfo.size() > 0) {
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96 | int errorCount = 0; // Count the number of errors found in the given collection
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97 |
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98 | for (long i = startDoc; i < response.docInfo.size(); ++i) {
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99 | if (errorCount > 3) { // If num errors reaches the cut-off value, bail.
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100 | cerr << "Error: too many records(" << errorCount << ") in the " << gsdlCollect
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101 | << " collection have invalid or non-existant oai_ids - skipping remainder of collection.\n";
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102 | return;
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103 | }
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104 |
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105 | text_t oai_id = "oai.";
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106 | oai_id += i;
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107 |
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108 | text_t gsdl_id = oaiclassifier::getGSDL_OID(gsdlCollect, oai_id, protocol, *this->logout);
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109 |
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110 | if (gsdl_id == "") { // If the string is empty, then the document didn't have an oai_id, so
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111 | ++errorCount; // increase error count
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112 | continue;
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113 | }
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114 |
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115 |
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116 | // Check that the item with the 0ID 'gsdl_id' has a lastmodified field that fits within
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117 | // the required date range (if specified).
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118 | if (this->inDateRange(params["from"], params["until"], gsdlCollect, gsdl_id, protocol, output)) {
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119 | if (this->output_document(output, protocol, gsdlCollect, gsdl_id, metadataPrefix)) {
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120 | // this should be an IF statement, where prevDocSeen is only set to true if the above
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121 | // function call returns true (indicating that the doc supported the metadata prefix) but
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122 | // for some reason this is always false. This means that if no doc in the requested set supports
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123 | // the metadata format, the "no records match" error that should be thrown won't be...
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124 | //
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125 | // GRB: the above comment is no longer true; proper checks are made
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126 | this->prevDocSeen = true;
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127 | ++this->outputDocs;
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128 | }
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129 | }
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130 |
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131 | // if we've output the number of resumption documents; prepare a resumptionToken
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132 | if (this->outputDocs == this->configuration->resumeAfter()) {
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133 | this->replyToken = new ResumptionToken(gsdlCollect, "", "");
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134 | this->replyToken->setPosition("", i+2);
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135 | break;
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136 | }
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137 | }
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138 |
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139 | cinfo.clear(); // Clear for next collection to use (if there is one).
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140 | }
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141 | }
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142 |
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143 | //--------------------------------------------------------------------------------------------
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144 | // Returns true if at least one document record is found
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145 | void abstractlistaction::output_content_for_all(ostream &output, recptproto *protocol, oaiargs ¶ms)
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146 | {
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147 | ColInfoResponse_t cinfo;
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148 | comerror_t err;
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149 | text_tarray collections;
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150 | text_t gsdlCollect = "";
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151 | ResumptionToken *token = NULL;
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152 |
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153 | // get a list of the collections available
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154 | collections = this->configuration->getCollectionsList();
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155 | // protocol->get_collection_list(collections, err, output);
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156 |
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157 | if (params["resumptionToken"] != "") {
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158 | token = new ResumptionToken(params["resumptionToken"]);
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159 | }
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160 |
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161 | for(int current_col = 0; current_col < collections.size(); ++current_col){
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162 | gsdlCollect = collections[current_col];
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163 |
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164 | // ignore all leading collections before the one that matches the resumptiontoken
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165 | if (token != NULL &&
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166 | token->getCollection() != gsdlCollect)
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167 | { continue;
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168 | }
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169 |
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170 | this->output_content_for_col(output, protocol, gsdlCollect, cinfo, err, params);
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171 |
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172 | // once we've output at least one collection, continue
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173 | // outputting all others until the resumption total hits
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174 | token = NULL;
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175 |
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176 | if (this->outputDocs == this->configuration->resumeAfter()) {
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177 | break;
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178 | }
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179 | }
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180 | }
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181 |
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182 | //-------------------------------------------------------------------------------------------------
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183 | // Check that the requested from/until dates don't include a time, as this would be asking for too
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184 | // fine a level of granularity, one that greenstone doesn't support. An OAI error must be thrown.
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185 | /*
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186 | bool abstractlistaction::granularityTooFine(text_t &from, text_t &until)
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187 | {
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188 | if (from != "" && from.){
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189 |
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190 | }
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191 |
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192 | }
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193 | */
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194 | //-------------------------------------------------------------------------------------------------
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195 |
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196 | bool abstractlistaction::check_classifier(recptproto *protocol, const text_t &collection,
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197 | const text_t &classifier)
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198 | { text_t topClass;
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199 | FilterResponse_t response;
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200 | text_tset metadata;
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201 | ofstream logout("oai.log", ios::app);
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202 |
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203 | // exclude false children of a top-level classifier immediately...
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204 | if (!get_info(classifier, collection, "", metadata, false, protocol, response, logout)) {
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205 | return false;
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206 | }
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207 |
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208 | // now check the top-level parent
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209 | metadata.insert("supportsmemberof");
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210 |
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211 | text_t::const_iterator dot = findchar(classifier.begin(), classifier.end(), '.');
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212 | if (dot != classifier.end()) {
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213 | topClass = substr(classifier.begin(), dot);
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214 | }
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215 | else {
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216 | topClass = classifier;
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217 | }
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218 |
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219 | if (!get_info(topClass, collection, "", metadata, false, protocol, response, logout)) {
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220 | return false;
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221 | }
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222 |
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223 | if (response.docInfo[0].metadata["supportsmemberof"].values.size() == 0) {
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224 | return false;
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225 | }
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226 |
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227 | if (response.docInfo[0].metadata["supportsmemberof"].values[0] != "true") {
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228 | return false;
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229 | }
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230 |
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231 | return true;
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232 | }
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233 |
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234 | void abstractlistaction::recurse_set(ostream &output, recptproto *protocol, const text_t &collection,
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235 | const text_t &classifier, oaiargs ¶ms, ResumptionToken *resumptionToken)
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236 | {
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237 | // metadata for this call
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238 | FilterResponse_t response;
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239 | text_tset metadata;
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240 | ofstream logout("oai.log", ios::app);
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241 | text_t from = params["from"];
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242 | text_t until = params["until"];
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243 | text_t metadataPrefix = params["metadataPrefix"];
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244 | // ResumptionToken resumptionToken(params["resumptionToken"]);
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245 | int startPos = 0;
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246 |
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247 | // This is a recursive function, and so just because the current set is empty doesn't mean we necessarily
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248 | // want to throw a 'noRecordsMatch' error; another set (parent/sibling/child) may have had documents. It
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249 | // is therefore not enough to check that the response object in the current iteration has no docs - we
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250 | // must also verify that NO OTHER set has had any documents. This is done with the 'prevDocSeen' flag.
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251 | // It is set to FALSE initially, but as soon as we see a set that isn't empty, it is set to TRUE. The
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252 | // 'noRecordsMatch' error will only be thrown if, after all appropriate sets have been recursed into,
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253 | // the 'prevDocSeen' flag is still FALSE. The function returns false if no docs were seen, allowing us to
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254 | // throw the noRecordsMatch error.
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255 |
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256 | // bool prevDocSeen = false;
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257 |
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258 | get_children(classifier, collection, "", metadata, false, protocol, response, *this->logout);
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259 |
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260 | if (params["resumptionToken"] != "") {
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261 | // if we're at a resumptionToken
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262 | if (classifier == resumptionToken->getNode()) {
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263 | startPos = resumptionToken->getPosition();
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264 | }
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265 | else {
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266 | text_t fullNode = resumptionToken->getNode();
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267 | text_t::iterator leafIter = fullNode.begin() + classifier.size();
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268 |
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269 | // if the next character isn't a dot, blow up!
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270 | if (*leafIter != '.') {
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271 | // fatal error;
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272 | exit(1);
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273 | }
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274 |
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275 | // get the first '.' after the current classifier point;
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276 | text_t::iterator separator = findchar(leafIter + 1, fullNode.end(), '.');
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277 |
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278 | // now, create a new subpath
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279 | text_t nextNode = substr(fullNode.begin(), separator);
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280 |
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281 | // seek forward; TODO: improve performance of this
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282 | for (int c = 0; c < response.numDocs; ++c) {
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283 | if (response.docInfo[c].OID == nextNode) {
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284 | startPos = c;
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285 | break;
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286 | }
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287 | }
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288 | }
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289 |
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290 | // We need to subtract one from the startPos value to turn it into an index value
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291 | startPos--;
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292 | }
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293 |
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294 | for (int c = startPos; c < response.numDocs; ++c) {
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295 | text_t child = response.docInfo[c].OID;
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296 |
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297 | // distinguish classifiers and documents by checking whether OID
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298 | // starts with CL or not
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299 | text_t childHead;
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300 | text_t::const_iterator start = child.begin();
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301 | text_t::const_iterator here = child.begin();
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302 | here += 2;
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303 | childHead = substr(start, here);
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304 |
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305 | // documents we output now
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306 | if (childHead != "CL") {
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307 | // Check that the item with the 0ID 'gsdl_id' has a lastmodified field that fits
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308 | // within the required date range (if specified)
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309 | if (this->inDateRange(from, until, collection, child, protocol, output)) {
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310 | // TODO: check that the document can be disseminated in the required metadataPrefix
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311 |
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312 | if (this->output_document(output, protocol, collection, child, metadataPrefix)) {
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313 | this->prevDocSeen = true;
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314 | ++this->outputDocs;
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315 | }
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316 | }
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317 | }
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318 | // children which are classifiers are recursed
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319 | else {
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320 | if (resumptionToken != NULL) {
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321 | int depth = countchar(classifier.begin(), classifier.end(), '.');
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322 | resumptionToken->setOffset(depth, c+2);
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323 | }
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324 | this->recurse_set(output, protocol, collection, child, params, resumptionToken);
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325 | }
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326 |
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327 | if (this->outputDocs == this->configuration->resumeAfter()) {
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328 | this->replyToken = new ResumptionToken(collection, params["set"], "");
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329 | this->replyToken->setPosition(classifier, c+2);
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330 | break;
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331 | }
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332 | }
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333 | }
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334 |
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335 |
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336 |
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337 |
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