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<?php |
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namespace Guillermoandrae\DynamoDb\Contract; |
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use ErrorException; |
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use Guillermoandrae\DynamoDb\Constant\Operators; |
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trait FilterExpressionAwareOperationTrait |
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{ |
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use DynamoDbClientAwareTrait; |
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/** |
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* @var string The filter expression. |
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*/ |
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protected $filterExpression; |
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/** |
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* @var array Values that can be substituted in an expression. |
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*/ |
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protected $expressionAttributeValues = []; |
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/** |
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* Registers the filter expression with this object. |
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* |
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* @param array $data The filter expression data. |
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* @return mixed This object. |
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* @throws ErrorException |
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*/ |
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final public function setFilterExpression(array $data) |
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{ |
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$filterExpressionArray = []; |
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foreach ($data as $key => $options) { |
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$filterExpressionArray[] = $this->parseExpression($options['operator'], $key); |
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$this->addExpressionAttributeValue($key, $options['value']); |
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} |
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$this->filterExpression = implode(' and ', $filterExpressionArray); |
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return $this; |
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} |
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/** |
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* Uses the operator to build the filter expression. |
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* |
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* @param string $operator The request operator. |
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* @param string $key The attribute key. |
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* @return string The expression. |
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* @throws ErrorException |
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*/ |
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protected function parseExpression(string $operator, string $key): string |
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{ |
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switch ($operator) { |
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case Operators::BEGINS_WITH: |
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return sprintf('begins_with(%s, :%s)', $key, $key); |
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case Operators::CONTAINS: |
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return sprintf('contains(%s, :%s)', $key, $key); |
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case Operators::EQ: |
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return sprintf('%s = :%s', $key, $key); |
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case Operators::GT: |
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return sprintf('%s > :%s', $key, $key); |
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case Operators::GTE: |
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return sprintf('%s >= :%s', $key, $key); |
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case Operators::LT: |
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return sprintf('%s < :%s', $key, $key); |
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case Operators::LTE: |
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return sprintf('%s <= :%s', $key, $key); |
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default: |
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throw new ErrorException('The provided operator is not supported.'); |
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} |
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} |
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/** |
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* Adds an ExpressionAttributeValue to the request. |
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* |
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* @param string $key The attribute token. |
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* @param mixed $value The attribute value. |
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* @return mixed This object. |
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*/ |
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final public function addExpressionAttributeValue(string $key, $value) |
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{ |
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$this->expressionAttributeValues[sprintf(':%s', $key)] = $this->getMarshaler()->marshalValue($value); |
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return $this; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function toArray(): array |
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{ |
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$query = []; |
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if (!empty($this->filterExpression)) { |
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$query['FilterExpression'] = $this->filterExpression; |
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} |
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if (!empty($this->expressionAttributeValues)) { |
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$query['ExpressionAttributeValues'] = $this->expressionAttributeValues; |
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} |
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return $query; |
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} |
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} |
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guillermoandrae /
php-dynamodb
