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<?php

declare(strict_types = 1);

namespace Spameri\ElasticQuery\Query;

/**

* Weighted tokens query — token weights against a sparse_vector field.

* @see https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-weighted-tokens-query.html

class WeightedTokens implements LeafQueryInterface

{

/**

* @param array<string, float> $tokens Token => weight pairs.

* @param array<string, mixed>|null $pruningConfig

public function __construct(

private string $field,

private array $tokens,

private array|null $pruningConfig = null,

)

{

if ($tokens === []) {

throw new \Spameri\ElasticQuery\Exception\InvalidArgumentException(

'WeightedTokens requires at least one token.',

);

}

public function key(): string

{

return 'weighted_tokens_' . $this->field;

}

/**

* @return array<string, array<string, array<string, mixed>>>

public function toArray(): array

{

$body = [

'tokens' => $this->tokens,

];

if ($this->pruningConfig !== null) {

$body['pruning_config'] = $this->pruningConfig;

}

return [

'weighted_tokens' => [

$this->field => $body,

];

}

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