Batch.php

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<?php

namespace Elgg\Upgrade;

abstract class Batch {

    const UNKNOWN_COUNT = -1;

    protected $upgrade;

    public function __construct(\ElggUpgrade $upgrade = null) {
        $this->upgrade = $upgrade;
    }
    
    abstract public function getVersion(): int;

    abstract public function shouldBeSkipped(): bool;

    abstract public function needsIncrementOffset(): bool;

    abstract public function countItems(): int;

    abstract public function run(Result $result, $offset): Result;

    final public function getUpgrade(): ?\ElggUpgrade {
        return $this->upgrade;
    }
}