ObjectiveWithPreconditions.php

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<?php

/* Copyright (c) 2019 Richard Klees <richard.klees@concepts-and-training.de> Extended GPL, see docs/LICENSE */

namespace ILIAS\Setup;

use ILIAS\UI;

class ObjectiveWithPreconditions implements Objective
{
    protected $original;

    protected $preconditions;

    public function __construct(Objective $original, Objective ...$preconditions)
    {
        if (count($preconditions) === 0) {
            throw new \InvalidArgumentException(
                "Expected at least one precondition."
            );
        }
        $this->original = $original;
        $this->preconditions = $preconditions;
    }

    public function getHash() : string
    {
        return $this->original->getHash();
    }

    public function getLabel() : string
    {
        return $this->original->getLabel();
    }

    public function isNotable() : bool
    {
        return $this->original->isNotable();
    }

    public function getPreconditions(Environment $environment) : array
    {
        return array_merge($this->preconditions, $this->original->getPreconditions($environment));
    }

    public function achieve(Environment $environment) : Environment
    {
        return $this->original->achieve($environment);
    }
}