ElasticSearchPage_Controller::init() - Code Metrics - Inspection of "WIP: Further refactoring" - gordonbanderson/silverstripe-elastica - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — dev2 ( 1cdcda...1d8072 )

by Gordon

created 2015-12-03 05:16 UTC

ElasticSearchPage_Controller::init() A

↳ Parent: ElasticSearchPage_Controller

Complexity

Conditions	1
Paths	1

Size

Total Lines	10
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Metric	Value
dl	0
loc	10
rs	9.4286
cc	1
eloc	7
nc	1
nop	0

<?php

use Elastica\Document;
use Elastica\Query;
use \SilverStripe\Elastica\ResultList;
use Elastica\Query\QueryString;
use Elastica\Aggregation\Filter;
use Elastica\Filter\Term;
use Elastica\Filter\BoolAnd;
use Elastica\Aggregation\Terms;
use Elastica\Query\Filtered;
use Elastica\Query\Range;
use \SilverStripe\Elastica\ElasticSearcher;
use \SilverStripe\Elastica\Searchable;
use \SilverStripe\Elastica\QueryGenerator;
use \SilverStripe\Elastica\ElasticaUtil;

class ElasticSearchPage_Controller extends Page_Controller {

	private static $allowed_actions = array('SearchForm', 'submit', 'index', 'similar');

	public function init() {
		parent::init();

		Requirements::javascript(THIRDPARTY_DIR . '/jquery/jquery.js');
		Requirements::javascript("elastica/javascript/jquery.autocomplete.js");
		Requirements::javascript("elastica/javascript/elastica.js");
		Requirements::css("elastica/css/elastica.css");

		$this->SearchPage = Controller::curr()->dataRecord;
	}



	/*
	Find DataObjects in Elasticsearch similar to the one selected.  Note that aggregations are not
	taken into account, merely the text of the selected document.
	 */
	public function similar() {
		//FIXME double check security, ie if escaping needed
		$class = $this->request->param('ID');
		$instanceID = $this->request->param('OtherID');

		$data = $this->initialiseDataArray();
		$es = $this->primeElasticSearcherFromRequest();
		$this->setMoreLikeThisParamsFromRequest($es);

		$this->addSiteTreeFilterIfRequired($es);

		// get the edited fields to search from the database for this search page
		// Convert this into a name => weighting array
		$fieldsToSearch = array();
		$editedSearchFields = $this->ElasticaSearchableFields()->filter(array(
			'Active' => true,
			'SimilarSearchable' => true
		));

		foreach($editedSearchFields->getIterator() as $searchField) {
			$fieldsToSearch[$searchField->Name] = $searchField->Weight;
		}

		// Use the standard field for more like this, ie not stemmed
		foreach($fieldsToSearch as $field => $value) {
			$fieldsToSearch[$field . '.standard'] = $value;
			unset($fieldsToSearch[$field]);
		}

		try {
			// Simulate server being down for testing purposes
			if($this->request->getVar('ServerDown')) {
				throw new Elastica\Exception\Connection\HttpException('Unable to reach search server');
			}
			if(class_exists($class)) {
				$instance = \DataObject::get_by_id($class, $instanceID);

				$paginated = $es->moreLikeThis($instance, $fieldsToSearch);

				$this->Aggregations = $es->getAggregations();
				$this->successfulSearch($data, $paginated);
				$data['SimilarTo'] = $instance;


				$moreLikeThisTerms = $paginated->getList()->MoreLikeThisTerms;
				$fieldToTerms = new ArrayList();
				foreach(array_keys($moreLikeThisTerms) as $fieldName) {
					$readableFieldName = str_replace('.standard', '', $fieldName);
					$fieldTerms = new ArrayList();
					foreach($moreLikeThisTerms[$fieldName] as $value) {
						$do = new DataObject();
						$do->Term = $value;
						$fieldTerms->push($do);
					}

					$do = new DataObject();
					$do->FieldName = $readableFieldName;
					$do->Terms = $fieldTerms;
					$fieldToTerms->push($do);
				}

				$data['SimilarSearchTerms'] = $fieldToTerms;
			} else {
				// class does not exist
				$data['ErrorMessage'] = "Class $class is either not found or not searchable\n";
			}
		} catch (\InvalidArgumentException $e) {
			$data['ErrorMessage'] = "Class $class is either not found or not searchable\n";
		} catch (Elastica\Exception\Connection\HttpException $e) {
			$data['ErrorMessage'] = 'Unable to connect to search server';
		}


		$elapsed = $this->calculateTime();
		$data['ElapsedTime'] = $elapsed;


		return $this->renderResults($data);
	}



	/*
	Display the search form. If the query parameter exists, search against Elastica
	and render results accordingly.
	 */
	public function index() {
		$data = $this->initialiseDataArray();
		$es = $this->primeElasticSearcherFromRequest();
		$this->dealWithAggregation($es);
		$this->addSiteTreeFilterIfRequired($es);



		$testMode = !empty($this->request->getVar('TestMode'));


		// get the edited fields to search from the database for this search page
		// Convert this into a name => weighting array
		$fieldsToSearch = array();
		$editedSearchFields = $this->ElasticaSearchableFields()->filter(array(
			'Active' => true,
			'Searchable' => true
		));

		foreach($editedSearchFields->getIterator() as $searchField) {
			$fieldsToSearch[$searchField->Name] = $searchField->Weight;
		}

		$paginated = null;
		try {
			// Simulate server being down for testing purposes
			if(!empty($this->request->getVar('ServerDown'))) {
				throw new Elastica\Exception\Connection\HttpException('Unable to reach search server');
			}

			// now actually perform the search using the original query
			$paginated = $es->search($this->QueryText, $fieldsToSearch, $testMode);

			// This is the case of the original query having a better one suggested.  Do a
			// second search for the suggested query, throwing away the original
			if($es->hasSuggestedQuery() && !$this->IgnoreSuggestions) {
				$data['SuggestedQuery'] = $es->getSuggestedQuery();
				$data['SuggestedQueryHighlighted'] = $es->getSuggestedQueryHighlighted();
				//Link for if the user really wants to try their original query
				$sifLink = rtrim($this->Link(), '/') . '?q=' . $this->QueryText . '&is=1';
				$data['SearchInsteadForLink'] = $sifLink;
				$paginated = $es->search($es->getSuggestedQuery(), $fieldsToSearch);

			}

			$elapsed = $this->calculateTime();
			$data['ElapsedTime'] = $elapsed;

			$this->Aggregations = $es->getAggregations();
			$this->successfulSearch($data, $paginated);

		} catch (Elastica\Exception\Connection\HttpException $e) {
			$data['ErrorMessage'] = 'Unable to connect to search server';
		}

		$data['OriginalQuery'] = $this->QueryText;
		$data['IgnoreSuggestions'] = $this->IgnoreSuggestions;

		return $this->renderResults($data);

	}


	private function successfulSearch(&$data, $paginated) {
		$data['SearchResults'] = $paginated;
		$data['SearchPerformed'] = true;
		$data['NumberOfResults'] = $paginated->getTotalItems();
		$data['SearchPageLink'] = $this->SearchPage->Link();
	}


	/*
	Return true if the query is not empty
	 */
	public function QueryIsEmpty() {
		return empty($this->request->getVar('q'));
	}


	/**
	 * Process submission of the search form, redirecting to a URL that will render search results
	 * @param  array $data form data
	 * @param  Form $form form
	 */
	public function submit($data, $form) {
		$queryText = $data['q'];
		$url = $this->Link();
		$url = rtrim($url, '/');
		$link = rtrim($url, '/') . '?q=' . $queryText . '&sfid=' . $data['identifier'];
		$this->redirect($link);
	}


	/*
	Obtain an instance of the form
	*/
	public function SearchForm() {
		$form = new ElasticSearchForm($this, 'SearchForm');
		$fields = $form->Fields();
		$elasticaSearchPage = Controller::curr()->dataRecord;
		$identifierField = new HiddenField('identifier');
		$identifierField->setValue($elasticaSearchPage->Identifier);

		$fields->push($identifierField);
		$queryField = $fields->fieldByName('q');

		 if($this->isParamSet('q') && $this->isParamSet('sfid')) {
		 	$sfid = $this->request->getVar('sfid');
			if($sfid == $elasticaSearchPage->Identifier) {

				$queryText = $this->request->getVar('q');
				$queryField->setValue($queryText);
			}

		}

		if($this->action == 'similar') {
			$queryField->setDisabled(true);
			$actions = $form->Actions();
			if(!empty($actions)) {
				foreach($actions as $field) {
					$field->setDisabled(true);
				}
			}

		}

		if($this->AutoCompleteFieldID > 0) {
			ElasticaUtil::addAutocompleteToQueryField(
				$queryField,
				$this->ClassesToSearch,
				$this->SiteTreeOnly,
				$this->Link(),
				$this->AutocompleteFunction()->Slug
			);
		}
		return $form;
	}


	/**
	 * @param string $paramName
	 */
	private function isParamSet($paramName) {
		return !empty($this->request->getVar($paramName));
	}


	/**
	 * Set the start page from the request and results per page for a given searcher object
	 */
	private function primeElasticSearcherFromRequest() {
		$elasticSearcher = new ElasticSearcher();
		// start, and page length, i.e. pagination
		$startParam = $this->request->getVar('start');
		$start = isset($startParam) ? $startParam : 0;
		$elasticSearcher->setStart($start);
		$this->StartTime = microtime(true);
		$elasticSearcher->setPageLength($this->SearchPage->ResultsPerPage);

		// Do not show suggestions if this flag is set
		$this->IgnoreSuggestions = null !== $this->request->getVar('is');

		// query string
		$queryTextParam = $this->request->getVar('q');
		$queryText = !empty($queryTextParam) ? $queryTextParam : '';
		$this->QueryText = $queryText;

		return $elasticSearcher;
	}


	/**
	 * Set the admin configured similarity parameters
	 * @param \SilverStripe\Elastica\ElasticSearcher &$elasticSearcher ElasticaSearcher object
	 */
	private function setMoreLikeThisParamsFromRequest(&$elasticSearcher) {
		$elasticSearcher->setMinTermFreq($this->MinTermFreq);
		$elasticSearcher->setMaxTermFreq($this->MaxTermFreq);
		$elasticSearcher->setMinDocFreq($this->MinDocFreq);
		$elasticSearcher->setMaxDocFreq($this->MaxDocFreq);
		$elasticSearcher->setMinWordLength($this->MinWordLength);
		$elasticSearcher->setMaxWordLength($this->MaxWordLength);
		$elasticSearcher->setMinShouldMatch($this->MinShouldMatch);
		$elasticSearcher->setSimilarityStopWords($this->SimilarityStopWords);
	}


	private function dealWithAggregation(&$es) {
		$ignore = \Config::inst()->get('Elastica', 'BlackList');
		foreach($this->request->getVars() as $key => $value) {
			if(!in_array($key, $ignore)) {
				$es->addFilter($key, $value);
			}
		}

		// set the optional aggregation manipulator
		// In the event of a manipulator being present, show all the results for search
		// Otherwise aggregations are all zero
		if($this->SearchHelper) {
			$es->setQueryResultManipulator($this->SearchHelper);
			$es->showResultsForEmptySearch();
		} else {
			$es->hideResultsForEmptySearch();
		}
	}


	private function addSiteTreeFilterIfRequired(&$es) {
		// filter by class or site tree
		if($this->SearchPage->SiteTreeOnly) {
			$es->addFilter('IsInSiteTree', true);
		} else {
			$es->setClasses($this->SearchPage->ClassesToSearch);
		}
	}


	private function initialiseDataArray() {
		return array(
			'Content' => $this->Content,
			'Title' => $this->Title,
			'SearchPerformed' => false
		);
	}


	private function renderResults($data) {
		// allow the optional use of overriding the search result page, e.g. for photos, maps or facets
		if($this->hasExtension('PageControllerTemplateOverrideExtension')) {
			return $this->useTemplateOverride($data);
		} else {
			return $data;
		}
	}


	private function calculateTime() {
		$endTime = microtime(true);
		$elapsed = round(100 * ($endTime - $this->StartTime)) / 100;
		return $elapsed;
	}
}


1			<?php
2
3			use Elastica\Document;
4			use Elastica\Query;
5			use \SilverStripe\Elastica\ResultList;
6			use Elastica\Query\QueryString;
7			use Elastica\Aggregation\Filter;
8			use Elastica\Filter\Term;
9			use Elastica\Filter\BoolAnd;
10			use Elastica\Aggregation\Terms;
11			use Elastica\Query\Filtered;
12			use Elastica\Query\Range;
13			use \SilverStripe\Elastica\ElasticSearcher;
14			use \SilverStripe\Elastica\Searchable;
15			use \SilverStripe\Elastica\QueryGenerator;
16			use \SilverStripe\Elastica\ElasticaUtil;
17
18			class ElasticSearchPage_Controller extends Page_Controller {
19
20			private static $allowed_actions = array('SearchForm', 'submit', 'index', 'similar');
21
22			public function init() {
23			parent::init();
24
25			Requirements::javascript(THIRDPARTY_DIR . '/jquery/jquery.js');
26			Requirements::javascript("elastica/javascript/jquery.autocomplete.js");
27			Requirements::javascript("elastica/javascript/elastica.js");
28			Requirements::css("elastica/css/elastica.css");
29
30			$this->SearchPage = Controller::curr()->dataRecord;
31			}
32
33
34
35			/*
36			Find DataObjects in Elasticsearch similar to the one selected. Note that aggregations are not
37			taken into account, merely the text of the selected document.
38			*/
39			public function similar() {
40			//FIXME double check security, ie if escaping needed
41			$class = $this->request->param('ID');
42			$instanceID = $this->request->param('OtherID');
43
44			$data = $this->initialiseDataArray();
45			$es = $this->primeElasticSearcherFromRequest();
46			$this->setMoreLikeThisParamsFromRequest($es);
47
48			$this->addSiteTreeFilterIfRequired($es);
49
50			// get the edited fields to search from the database for this search page
51			// Convert this into a name => weighting array
52			$fieldsToSearch = array();
53			$editedSearchFields = $this->ElasticaSearchableFields()->filter(array(
54			'Active' => true,
55			'SimilarSearchable' => true
56			));
57
58			foreach($editedSearchFields->getIterator() as $searchField) {
59			$fieldsToSearch[$searchField->Name] = $searchField->Weight;
60			}
61
62			// Use the standard field for more like this, ie not stemmed
63			foreach($fieldsToSearch as $field => $value) {
64			$fieldsToSearch[$field . '.standard'] = $value;
65			unset($fieldsToSearch[$field]);
66			}
67
68			try {
69			// Simulate server being down for testing purposes
70			if($this->request->getVar('ServerDown')) {
71			throw new Elastica\Exception\Connection\HttpException('Unable to reach search server');
72			}
73			if(class_exists($class)) {
74			$instance = \DataObject::get_by_id($class, $instanceID);
75
76			$paginated = $es->moreLikeThis($instance, $fieldsToSearch);
77
78			$this->Aggregations = $es->getAggregations();
79			$this->successfulSearch($data, $paginated);
80			$data['SimilarTo'] = $instance;
81
82
83			$moreLikeThisTerms = $paginated->getList()->MoreLikeThisTerms;
84			$fieldToTerms = new ArrayList();
85			foreach(array_keys($moreLikeThisTerms) as $fieldName) {
86			$readableFieldName = str_replace('.standard', '', $fieldName);
87			$fieldTerms = new ArrayList();
88			foreach($moreLikeThisTerms[$fieldName] as $value) {
89			$do = new DataObject();
90			$do->Term = $value;
91			$fieldTerms->push($do);
92			}
93
94			$do = new DataObject();
95			$do->FieldName = $readableFieldName;
96			$do->Terms = $fieldTerms;
97			$fieldToTerms->push($do);
98			}
99
100			$data['SimilarSearchTerms'] = $fieldToTerms;
101			} else {
102			// class does not exist
103			$data['ErrorMessage'] = "Class $class is either not found or not searchable\n";
104			}
105			} catch (\InvalidArgumentException $e) {
106			$data['ErrorMessage'] = "Class $class is either not found or not searchable\n";
107			} catch (Elastica\Exception\Connection\HttpException $e) {
108			$data['ErrorMessage'] = 'Unable to connect to search server';
109			}
110
111
112			$elapsed = $this->calculateTime();
113			$data['ElapsedTime'] = $elapsed;
114
115
116			return $this->renderResults($data);
117			}
118
119
120
121			/*
122			Display the search form. If the query parameter exists, search against Elastica
123			and render results accordingly.
124			*/
125			public function index() {
126			$data = $this->initialiseDataArray();
127			$es = $this->primeElasticSearcherFromRequest();
128			$this->dealWithAggregation($es);
129			$this->addSiteTreeFilterIfRequired($es);
130
131
132
133			$testMode = !empty($this->request->getVar('TestMode'));
134
135
136			// get the edited fields to search from the database for this search page
137			// Convert this into a name => weighting array
138			$fieldsToSearch = array();
139			$editedSearchFields = $this->ElasticaSearchableFields()->filter(array(
140			'Active' => true,
141			'Searchable' => true
142			));
143
144			foreach($editedSearchFields->getIterator() as $searchField) {
145			$fieldsToSearch[$searchField->Name] = $searchField->Weight;
146			}
147
148			$paginated = null;
149			try {
150			// Simulate server being down for testing purposes
151			if(!empty($this->request->getVar('ServerDown'))) {
152			throw new Elastica\Exception\Connection\HttpException('Unable to reach search server');
153			}
154
155			// now actually perform the search using the original query
156			$paginated = $es->search($this->QueryText, $fieldsToSearch, $testMode);
157
158			// This is the case of the original query having a better one suggested. Do a
159			// second search for the suggested query, throwing away the original
160			if($es->hasSuggestedQuery() && !$this->IgnoreSuggestions) {
161			$data['SuggestedQuery'] = $es->getSuggestedQuery();
162			$data['SuggestedQueryHighlighted'] = $es->getSuggestedQueryHighlighted();
163			//Link for if the user really wants to try their original query
164			$sifLink = rtrim($this->Link(), '/') . '?q=' . $this->QueryText . '&is=1';
165			$data['SearchInsteadForLink'] = $sifLink;
166			$paginated = $es->search($es->getSuggestedQuery(), $fieldsToSearch);
167
168			}
169
170			$elapsed = $this->calculateTime();
171			$data['ElapsedTime'] = $elapsed;
172
173			$this->Aggregations = $es->getAggregations();
174			$this->successfulSearch($data, $paginated);
175
176			} catch (Elastica\Exception\Connection\HttpException $e) {
177			$data['ErrorMessage'] = 'Unable to connect to search server';
178			}
179
180			$data['OriginalQuery'] = $this->QueryText;
181			$data['IgnoreSuggestions'] = $this->IgnoreSuggestions;
182
183			return $this->renderResults($data);
184
185			}
186
187
188			private function successfulSearch(&$data, $paginated) {
189			$data['SearchResults'] = $paginated;
190			$data['SearchPerformed'] = true;
191			$data['NumberOfResults'] = $paginated->getTotalItems();
192			$data['SearchPageLink'] = $this->SearchPage->Link();
193			}
194
195
196			/*
197			Return true if the query is not empty
198			*/
199			public function QueryIsEmpty() {
200			return empty($this->request->getVar('q'));
201			}
202
203
204			/**
205			* Process submission of the search form, redirecting to a URL that will render search results
206			* @param array $data form data
207			* @param Form $form form
208			*/
209			public function submit($data, $form) {
210			$queryText = $data['q'];
211			$url = $this->Link();
212			$url = rtrim($url, '/');
213			$link = rtrim($url, '/') . '?q=' . $queryText . '&sfid=' . $data['identifier'];
214			$this->redirect($link);
215			}
216
217
218			/*
219			Obtain an instance of the form
220			*/
221			public function SearchForm() {
222			$form = new ElasticSearchForm($this, 'SearchForm');
223			$fields = $form->Fields();
224			$elasticaSearchPage = Controller::curr()->dataRecord;
225			$identifierField = new HiddenField('identifier');
226			$identifierField->setValue($elasticaSearchPage->Identifier);
227
228			$fields->push($identifierField);
229			$queryField = $fields->fieldByName('q');
230
231			if($this->isParamSet('q') && $this->isParamSet('sfid')) {
232			$sfid = $this->request->getVar('sfid');
233			if($sfid == $elasticaSearchPage->Identifier) {
234
235			$queryText = $this->request->getVar('q');
236			$queryField->setValue($queryText);
237			}
238
239			}
240
241			if($this->action == 'similar') {
242			$queryField->setDisabled(true);
243			$actions = $form->Actions();
244			if(!empty($actions)) {
245			foreach($actions as $field) {
246			$field->setDisabled(true);
247			}
248			}
249
250			}
251
252			if($this->AutoCompleteFieldID > 0) {
253			ElasticaUtil::addAutocompleteToQueryField(
254			$queryField,
255			$this->ClassesToSearch,
256			$this->SiteTreeOnly,
257			$this->Link(),
258			$this->AutocompleteFunction()->Slug
259			);
260			}
261			return $form;
262			}
263
264
265			/**
266			* @param string $paramName
267			*/
268			private function isParamSet($paramName) {
269			return !empty($this->request->getVar($paramName));
270			}
271
272
273			/**
274			* Set the start page from the request and results per page for a given searcher object
275			*/
276			private function primeElasticSearcherFromRequest() {
277			$elasticSearcher = new ElasticSearcher();
278			// start, and page length, i.e. pagination
279			$startParam = $this->request->getVar('start');
280			$start = isset($startParam) ? $startParam : 0;
281			$elasticSearcher->setStart($start);
282			$this->StartTime = microtime(true);
283			$elasticSearcher->setPageLength($this->SearchPage->ResultsPerPage);
284
285			// Do not show suggestions if this flag is set
286			$this->IgnoreSuggestions = null !== $this->request->getVar('is');
287
288			// query string
289			$queryTextParam = $this->request->getVar('q');
290			$queryText = !empty($queryTextParam) ? $queryTextParam : '';
291			$this->QueryText = $queryText;
292
293			return $elasticSearcher;
294			}
295
296
297			/**
298			* Set the admin configured similarity parameters
299			* @param \SilverStripe\Elastica\ElasticSearcher &$elasticSearcher ElasticaSearcher object
300			*/
301			private function setMoreLikeThisParamsFromRequest(&$elasticSearcher) {
302			$elasticSearcher->setMinTermFreq($this->MinTermFreq);
303			$elasticSearcher->setMaxTermFreq($this->MaxTermFreq);
304			$elasticSearcher->setMinDocFreq($this->MinDocFreq);
305			$elasticSearcher->setMaxDocFreq($this->MaxDocFreq);
306			$elasticSearcher->setMinWordLength($this->MinWordLength);
307			$elasticSearcher->setMaxWordLength($this->MaxWordLength);
308			$elasticSearcher->setMinShouldMatch($this->MinShouldMatch);
309			$elasticSearcher->setSimilarityStopWords($this->SimilarityStopWords);
310			}
311
312
313			private function dealWithAggregation(&$es) {
314			$ignore = \Config::inst()->get('Elastica', 'BlackList');
315			foreach($this->request->getVars() as $key => $value) {
316			if(!in_array($key, $ignore)) {
317			$es->addFilter($key, $value);
318			}
319			}
320
321			// set the optional aggregation manipulator
322			// In the event of a manipulator being present, show all the results for search
323			// Otherwise aggregations are all zero
324			if($this->SearchHelper) {
325			$es->setQueryResultManipulator($this->SearchHelper);
326			$es->showResultsForEmptySearch();
327			} else {
328			$es->hideResultsForEmptySearch();
329			}
330			}
331
332
333			private function addSiteTreeFilterIfRequired(&$es) {
334			// filter by class or site tree
335			if($this->SearchPage->SiteTreeOnly) {
336			$es->addFilter('IsInSiteTree', true);
337			} else {
338			$es->setClasses($this->SearchPage->ClassesToSearch);
339			}
340			}
341
342
343			private function initialiseDataArray() {
344			return array(
345			'Content' => $this->Content,
346			'Title' => $this->Title,
347			'SearchPerformed' => false
348			);
349			}
350
351
352			private function renderResults($data) {
353			// allow the optional use of overriding the search result page, e.g. for photos, maps or facets
354			if($this->hasExtension('PageControllerTemplateOverrideExtension')) {
355			return $this->useTemplateOverride($data);
356			} else {
357			return $data;
358			}
359			}
360
361
362			private function calculateTime() {
363			$endTime = microtime(true);
364			$elapsed = round(100 * ($endTime - $this->StartTime)) / 100;
365			return $elapsed;
366			}
367			}
368

gordonbanderson / silverstripe-elastica

Push — dev2 ( 1cdcda...1d8072 )

ElasticSearchPage_Controller::init() A

Complexity

Size

Duplication

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