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<?php |
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/** |
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* This file is part of the miBadger package. |
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* |
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* @author Michael Webbers <[email protected]> |
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* @license http://opensource.org/licenses/Apache-2.0 Apache v2 License |
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*/ |
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namespace miBadger\Query; |
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/** |
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* |
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* @since 2.0.0 |
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*/ |
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class QueryPredicate implements QueryExpression |
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{ |
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/* @var string The kind of predicate (AND or OR) */ |
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private $type; |
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/* @var array The list of subclauses that are combined by this predicate. */ |
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private $conditions; |
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/** |
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* Constructs a new query predicate of the given type |
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* @param string $type the predicate type. either 'AND', 'OR' or 'NOT' |
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* @param QueryExpression $left the first query expression to be used by this predicate |
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* @param QueryExpression ...$others the remaining query expressions, if applicable |
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*/ |
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public function __construct(string $type, QueryExpression $left, QueryExpression ...$others) |
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{ |
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$type = strtoupper($type); |
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switch ($type) { |
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case 'AND': |
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case 'OR': |
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if (empty($others)) { |
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throw new QueryException(sprintf("%s Operator needs at least two arguments", $type)); |
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} |
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$this->type = $type; |
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break; |
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case 'NOT': |
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if (!empty($others)) { |
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throw new QueryException("NOT Operator can only accept 1 argument"); |
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} |
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$this->type = $type; |
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break; |
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default: |
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throw new QueryException(sprintf("Invalid predicate operator \"%s\"", $type)); |
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} |
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$this->conditions = array_merge([$left], $others); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getFlattenedConditions() |
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{ |
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$conditions = []; |
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foreach ($this->conditions as $condition) { |
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$conditions = array_merge($conditions, $condition->getFlattenedConditions()); |
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} |
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return $conditions; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function __toString() |
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{ |
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$conditionSql = []; |
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foreach ($this->conditions as $cond) { |
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$conditionSql[] = sprintf('( %s )', (string) $cond); |
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} |
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$sql = ''; |
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switch ($this->type) { |
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case 'AND': |
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return join(' AND ', $conditionSql); |
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case 'OR': |
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return join(' OR ', $conditionSql); |
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case 'NOT': |
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return sprintf('NOT %s', $conditionSql[0]); |
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default: |
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// return ''; // This case can never happen |
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} |
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} |
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} |
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miBadger /
miBadger.Query
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