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<?php
declare(strict_types=1);
namespace OpenTelemetry\SDK\Metrics\View;
use OpenTelemetry\SDK\Metrics\AggregationInterface;
use OpenTelemetry\SDK\Metrics\Instrument;
use OpenTelemetry\SDK\Metrics\ViewProjection;
final class ViewTemplate
{
private ?string $name = null;
private ?string $description = null;
/**
* @var list<string>
*/
private ?array $attributeKeys = null;
private ?AggregationInterface $aggregation = null;
private function __construct()
{
}
public static function create(): self
{
static $instance;
return $instance ??= new self();
}
public function withName(string $name): self
{
$self = clone $this;
$self->name = $name;
return $self;
}
public function withDescription(string $description): self
{
$self = clone $this;
$self->description = $description;
return $self;
}
/**
* @param list<string> $attributeKeys
*/
public function withAttributeKeys(array $attributeKeys): self
{
$self = clone $this;
$self->attributeKeys = $attributeKeys;
return $self;
}
public function withAggregation(?AggregationInterface $aggregation): self
{
$self = clone $this;
$self->aggregation = $aggregation;
return $self;
}
public function project(Instrument $instrument): ViewProjection
{
return new ViewProjection(
$this->name ?? $instrument->name,
$instrument->unit,
$this->description ?? $instrument->description,
$this->attributeKeys,
$this->aggregation,
);
}
}
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