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GlobalSearchEngine.php
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1 <?PHP
2
3 #
4 # FILE: SPT--GlobalSearchEngine.php
5 #
6 # Part of the Collection Workflow Integration System (CWIS)
7 # Copyright 2005-2013 Edward Almasy and Internet Scout Research Group
8 # http://scout.wisc.edu/cwis/
9 #
10
11 /*
12 OUTSTANDING ISSUES:
13 - search string(s) must be escaped (~XX)
14 - search scores must be normalized
15 */
16
17
18 class GlobalSearchEngine
19 {
20
21 # ---- PUBLIC INTERFACE --------------------------------------------------
22
26 public function __construct()
27 {
28 }
29
40 public function Search($SearchString, $StartingResult = 0, $NumberOfResults = 10)
41 {
42 # save start time to use in calculating search time
43 $StartTime = $this->GetMicrotime();
44
45 # create OAI-SQ set specification from search string
46 $SetSpec = "OAI-SQ!".$SearchString;
47
48 # perform global search
49 $SearchResults = $this->PerformSearch(
50 $SetSpec, $StartingResult, $NumberOfResults);
51
52 # record search time
53 $this->LastSearchTime = $this->GetMicrotime() - $StartTime;
54
55 # return results to caller
56 return $SearchResults;
57 }
58
63 public function NumberOfResults()
64 {
65 return $this->NumberOfResultsAvailable;
66 }
67
72 public function SearchTime()
73 {
74 return $this->LastSearchTime;
75 }
76
77
78 # ---- PRIVATE INTERFACE -------------------------------------------------
79
80 private $NumberOfResultsAvailable;
81 private $LastSearchTime;
82
90 private function PerformSearch($SetSpec, $StartingResult, $NumberOfResults)
91 {
92 # for each global search site
93 $DB = new Database();
94 $DB->Query("SELECT * FROM GlobalSearchSites");
95 $SearchResults = array();
96 while ($SiteInfo = $DB->FetchRow())
97 {
98 # retrieve results from site
99 $SiteSearchResults = $this->SearchSite($SiteInfo, $SetSpec);
100
101 # add results to result list
102 $SearchResults = array_merge($SearchResults, $SiteSearchResults);
103 }
104
105 usort($SearchResults, function ($A, $B) {
106 return StdLib::SortCompare($A["Search Score"], $B["Search Score"]);
107 });
108
109 # save number of results found
110 $this->NumberOfResultsAvailable = count($SearchResults);
111
112 # trim result list to match range requested by caller
113 $SearchResults = array_slice($SearchResults, $StartingResult, $NumberOfResults);
114
115 # return search results to caller
116 return $SearchResults;
117 }
118
125 private function SearchSite($SiteInfo, $SetSpec)
126 {
127 # create OAI client and perform query
128 $Client = new OAIClient($SiteInfo["OaiUrl"]);
129 $Client->SetSpec($SetSpec);
130 $QueryResults = $Client->GetRecords();
131
132 # for each result returned from query
133 foreach ($QueryResults as $Result)
134 {
135 # extract and save result data where available
136 unset($ResultData);
137 $ResultData["Title"] =
138 isset($Result["metadata"]["DC:TITLE"][0])
139 ? $Result["metadata"]["DC:TITLE"][0] : NULL;
140 $ResultData["Description"] =
141 isset($Result["metadata"]["DC:DESCRIPTION"][0])
142 ? $Result["metadata"]["DC:DESCRIPTION"][0] : NULL;
143 $ResultData["Url"] =
144 isset($Result["metadata"]["DC:IDENTIFIER"][0])
145 ? $Result["metadata"]["DC:IDENTIFIER"][0] : NULL;
146 $ResultData["Full Record Link"] =
147 isset($Result["about"]["SEARCHINFO"]["FULLRECORDLINK"][0])
148 ? $Result["about"]["SEARCHINFO"]["FULLRECORDLINK"][0] : NULL;
149 $ResultData["Search Score"] =
150 isset($Result["about"]["SEARCHINFO"]["SEARCHSCORE"][0])
151 ? $Result["about"]["SEARCHINFO"]["SEARCHSCORE"][0] : NULL;
152 $ResultData["Cumulative Rating"] =
153 isset($Result["about"]["SEARCHINFO"]["CUMULATIVERATING"][0])
154 ? $Result["about"]["SEARCHINFO"]["CUMULATIVERATING"][0] : NULL;
155 $ResultData["Cumulative Rating Scale"] =
156 isset($Result["about"]["SEARCHINFO"]["CUMULATIVERATINGSCALE"][0])
157 ? $Result["about"]["SEARCHINFO"]["CUMULATIVERATINGSCALE"][0] : NULL;
158
159 # save site info for result
160 $ResultData["Site ID"] = $SiteInfo["SiteId"];
161 $ResultData["Site Name"] = $SiteInfo["SiteName"];
162 $ResultData["Site URL"] = $SiteInfo["SiteUrl"];
163
164 # add result data to search results
165 $SearchResults[] = $ResultData;
166 }
167
168 # return search results to caller
169 return $SearchResults;
170 }
171
176 private function GetMicrotime()
177 {
178 list($usec, $sec) = explode(" ", microtime());
179 return ((float)$usec + (float)$sec);
180 }
181 }
OAIClient
Definition: OAIClient.php:38
Database
SQL database abstraction object with smart query caching.
Definition: Database.php:22
StdLib\SortCompare
static SortCompare($A, $B)
Perform compare and return value appropriate for sort function callbacks.
Definition: StdLib.php:559
GlobalSearchEngine\NumberOfResults
NumberOfResults()
Gets the number of results returned in the last search.
Definition: GlobalSearchEngine.php:63
PHP
PHP
Definition: RSSClient--Test.php:12
GlobalSearchEngine\SearchTime
SearchTime()
Gets the time taken to perform the previous search, in microseconds.
Definition: GlobalSearchEngine.php:72
GlobalSearchEngine\__construct
__construct()
Constructs a GlobalSearchEngine object.
Definition: GlobalSearchEngine.php:26
GlobalSearchEngine\Search
Search($SearchString, $StartingResult=0, $NumberOfResults=10)
Performs a keyword search using a specified search string and returns the results, starting with the one numbered with the starting result (default 0) and continuing until reaching the desired number of results (default 10).
Definition: GlobalSearchEngine.php:40
GlobalSearchEngine
Definition: GlobalSearchEngine.php:18