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<?php |
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declare(strict_types = 1); |
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namespace Puzzle\QueryBuilder\Queries\Snippets; |
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use Puzzle\QueryBuilder\Snippet; |
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class Select implements Snippet |
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{ |
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private |
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$columns; |
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/** |
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* @param array[string|Selectable] | string|Selectable $columns |
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*/ |
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public function __construct($columns = []) |
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{ |
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$this->columns = []; |
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$this->addColumns($columns); |
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} |
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/** |
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* @param array[string|Selectable] | string|Selectable $columns |
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*/ |
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public function select($columns): self |
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{ |
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$this->addColumns($columns); |
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return $this; |
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} |
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public function toString(): string |
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{ |
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if(empty($this->columns)) |
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{ |
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throw new \LogicException('No columns defined for SELECT clause'); |
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} |
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return sprintf('SELECT %s', $this->buildColumnsString()); |
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} |
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private function buildColumnsString() |
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{ |
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$columns = array(); |
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foreach($this->columns as $column) |
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{ |
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if($column instanceof Selectable) |
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{ |
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$column = $column->toString(); |
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} |
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$columns[] = $column; |
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} |
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return implode(', ', array_unique($columns)); |
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} |
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private function addColumns($columns): void |
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{ |
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$columns = array_filter($this->ensureIsArray($columns)); |
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$this->validateColumns($columns); |
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$this->columns = array_merge($this->columns, $columns); |
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} |
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private function validateColumns($columns) |
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{ |
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foreach($columns as $column) |
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{ |
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if(! is_string($column) && (!$column instanceof Selectable)) |
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{ |
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throw new \InvalidArgumentException('Column name must be a string.'); |
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} |
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} |
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} |
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private function ensureIsArray($select): array |
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{ |
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if(! is_array($select)) |
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{ |
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$select = array($select); |
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} |
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return $select; |
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} |
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} |
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puzzle-org /
query-builder
The PSR-2 coding standard requires that all properties in a class have their visibility explicitly declared. If you declare a property using
the property is implicitly global.
To learn more about the PSR-2, please see the PHP-FIG site on the PSR-2.