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<?php |
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namespace BenTools\Where\Helper; |
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use BenTools\Where\Expression\Expression; |
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use function BenTools\Where\where; |
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final class CaseHelper extends Expression |
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{ |
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/** |
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* @var Expression |
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*/ |
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private $field; |
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/** |
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* @var Expression[] |
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*/ |
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private $when = []; |
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/** |
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* @var Expression[] |
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*/ |
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private $then = []; |
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/** |
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* @var Expression |
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*/ |
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private $else; |
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private $lock = false; |
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/** |
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* CaseHelper constructor. |
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* @param Expression|null $field |
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*/ |
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private function __construct(Expression $field = null) |
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{ |
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$this->field = $field; |
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} |
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/** |
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* @param $expression |
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* @param array ...$values |
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* @return CaseHelper |
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* @throws \InvalidArgumentException |
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*/ |
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public function when($expression, ...$values): self |
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{ |
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if (count($this->when) !== count($this->then)) { |
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throw new \RuntimeException("Mising a 'then' somewhere."); |
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} |
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if (true === $this->lock) { |
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throw new \RuntimeException('This conditionnal structure is locked.'); |
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} |
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$clone = clone $this; |
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$clone->when[] = where($expression, ...$values); |
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return $clone; |
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} |
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/** |
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* @param $expression |
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* @param array ...$values |
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* @return CaseHelper |
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* @throws \InvalidArgumentException |
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*/ |
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public function then($expression, ...$values): self |
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{ |
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if (count($this->when) !== count($this->then) + 1) { |
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throw new \RuntimeException("Mising a 'when' somewhere."); |
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} |
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if (true === $this->lock) { |
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throw new \RuntimeException('This conditionnal structure is locked.'); |
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} |
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$clone = clone $this; |
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$clone->then[] = where($expression, ...$values); |
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return $clone; |
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} |
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/** |
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* @param $expression |
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* @param array ...$values |
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* @return CaseHelper |
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* @throws \InvalidArgumentException |
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*/ |
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public function else($expression, ...$values): self |
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{ |
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if (true === $this->lock) { |
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throw new \RuntimeException('This conditionnal structure is locked.'); |
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} |
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$clone = clone $this; |
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$clone->else = where($expression, ...$values); |
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return $clone; |
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} |
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/** |
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* Only for fluent purposes. |
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* |
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* @return CaseHelper |
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*/ |
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public function end(): self |
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{ |
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$clone = clone $this; |
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$clone->lock = true; |
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return $clone; |
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} |
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/** |
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* @return string |
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*/ |
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public function __toString(): string |
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{ |
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$parts = ['CASE']; |
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if (null !== $this->field) { |
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$parts[] = $this->field; |
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} |
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foreach ($this->when as $key => $value) { |
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$parts[] = 'WHEN'; |
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$parts[] = $this->when[$key]; |
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$parts[] = 'THEN'; |
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$parts[] = $this->then[$key] ?? null; |
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} |
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if (null !== $this->else) { |
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$parts[] = 'ELSE'; |
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$parts[] = $this->else; |
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} |
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$parts[] = 'END'; |
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return implode(' ', $parts); |
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} |
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/** |
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* @return array |
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*/ |
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public function getValues(): array |
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{ |
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$values = [[]]; |
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if (null !== $this->field) { |
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$values[] = $this->field->getValues(); |
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} |
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foreach ($this->when as $key => $whenExpression) { |
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$values[] = $whenExpression->getValues(); |
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$thenExpression = $this->then[$key]; |
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if (null !== $thenExpression) { |
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$values[] = $thenExpression->getValues(); |
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} |
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} |
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if (null !== $this->else) { |
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$values[] = $this->else->getValues(); |
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} |
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return array_merge(...$values); |
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} |
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/** |
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* @param $expression |
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* @param array ...$values |
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* @return CaseHelper |
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* @throws \InvalidArgumentException |
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*/ |
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public static function create($expression = null, ...$values): self |
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{ |
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if (null !== $expression) { |
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$expression = where($expression, ...$values); |
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} |
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return new self($expression); |
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} |
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} |
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bpolaszek /
where
