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Ensure size is calculated once

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Andrea Marco Sartori 2023-01-22 09:47:38 +10:00
parent 7b7e3af470
commit a3f24d3e96
1 changed files with 14 additions and 1 deletions
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15
src/Sources/Source.php
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@ -27,6 +27,14 @@ abstract class Source implements IteratorAggregate
*/
protected ?int $size;
/**
* Whether the size was already calculated.
* Avoid re-calculations when the size is NULL (not computable).
*
* @var bool
*/
protected bool $sizeWasSet = false;
/**
* Retrieve the JSON fragments
*
@ -76,6 +84,11 @@ abstract class Source implements IteratorAggregate
*/
public function size(): ?int
{
return $this->size ??= $this->calculateSize();
if(!$this->sizeWasSet) {
$this->size = $this->calculateSize();
$this->sizeWasSet = true;
}
return $this->size;
}
}