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1<?php
2
3namespace CirrusSearch\Query;
4
5use CirrusSearch\CrossSearchStrategy;
6use CirrusSearch\Parser\AST\KeywordFeatureNode;
7use CirrusSearch\Query\Builder\QueryBuildingContext;
8use CirrusSearch\Search\SearchContext;
9use Elastica\Query;
10use Elastica\Query\AbstractQuery;
11
12/**
13 * Feature for filtering on specific text fields. Supports plain AND matching
14 * by default, and phrase matching when quoted.
15 */
16class TextFieldFilterFeature extends SimpleKeywordFeature implements FilterQueryFeature {
17
18    /** @var string Full text keyword to register */
19    private $keyword;
20
21    /** @var string Elasticsearch field to filter against */
22    private $field;
23
24    /**
25     * @param string $keyword Full text keyword to register
26     * @param string $field Elasticsearch field to filter against
27     */
28    public function __construct( $keyword, $field ) {
29        $this->keyword = $keyword;
30        $this->field = $field;
31    }
32
33    /**
34     * @return string[]
35     */
36    protected function getKeywords() {
37        return [ $this->keyword ];
38    }
39
40    /**
41     * @param KeywordFeatureNode $node
42     * @return CrossSearchStrategy
43     */
44    public function getCrossSearchStrategy( KeywordFeatureNode $node ) {
45        return CrossSearchStrategy::allWikisStrategy();
46    }
47
48    /**
49     * @param SearchContext $context
50     * @param string $key The keyword
51     * @param string $value The value attached to the keyword with quotes stripped
52     * @param string $quotedValue The original value in the search string, including quotes
53     *     if used
54     * @param bool $negated Is the search negated? Not used to generate the returned
55     *     AbstractQuery, that will be negated as necessary. Used for any other building/context
56     *     necessary.
57     * @return array Two element array, first an AbstractQuery or null to apply to the
58     *  query. Second a boolean indicating if the quotedValue should be kept in the search
59     *  string.
60     */
61    protected function doApply( SearchContext $context, $key, $value, $quotedValue, $negated ) {
62        $query = $this->doGetFilterQuery( $value, $quotedValue );
63
64        return [ $query, false ];
65    }
66
67    /**
68     * @param string $value
69     * @param string $quotedValue
70     * @return Query\MatchQuery|Query\MatchPhrase
71     */
72    protected function doGetFilterQuery( $value, $quotedValue ) {
73        if ( $value !== $quotedValue ) {
74            // If used with quotes we create a more precise phrase query
75            $query = new Query\MatchPhrase( $this->field, $value );
76        } else {
77            $query = new Query\MatchQuery( $this->field, [ 'query' => $value ] );
78            $query->setFieldOperator( $this->field, 'AND' );
79        }
80
81        return $query;
82    }
83
84    /**
85     * @param KeywordFeatureNode $node
86     * @param QueryBuildingContext $context
87     * @return AbstractQuery|null
88     */
89    public function getFilterQuery( KeywordFeatureNode $node, QueryBuildingContext $context ) {
90        return $this->doGetFilterQuery( $node->getValue(), $node->getQuotedValue() );
91    }
92}