ILIAS\Setup\ObjectiveIterator Class Reference

Tries to enumerate all preconditions for the given objective, where the ones that can be achieved (i.e. More...

Inheritance diagram for ILIAS\Setup\ObjectiveIterator:

Collaboration diagram for ILIAS\Setup\ObjectiveIterator:

Public Member Functions
	__construct (Environment $environment, Objective $objective)
	setEnvironment (Environment $environment)
	markAsFailed (Objective $objective)
	rewind ()
	current ()
	key ()
	next ()
	valid ()

Protected Member Functions
	detectDependencyCycles (string $cur, string $next)
	setReverseDependency (string $other, string $cur)

Protected Attributes
	$environment
	$objective
	$stack
	$current
	$returned
	$failed
	$reverse_dependencies

Detailed Description

Tries to enumerate all preconditions for the given objective, where the ones that can be achieved (i.e.

have no further preconditions on their own) will be returned first. Will also attempt to only return every objective once. This thus expects, that returned objectives will be achieved somehow.

Definition at line 17 of file ObjectiveIterator.php.

Constructor & Destructor Documentation

__construct()

ILIAS\Setup\ObjectiveIterator::__construct	(	Environment	$environment,
		Objective	$objective
	)

Definition at line 55 of file ObjectiveIterator.php.

References ILIAS\Setup\ObjectiveIterator\$environment, ILIAS\Setup\ObjectiveIterator\$objective, environment(), and ILIAS\Setup\ObjectiveIterator\rewind().

    {
        $this->environment = $environment;
        $this->objective = $objective;
        $this->rewind();
    }

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Member Function Documentation

current()

ILIAS\Setup\ObjectiveIterator::current

(

)

Definition at line 88 of file ObjectiveIterator.php.

References ILIAS\Setup\ObjectiveIterator\$current.

Referenced by ILIAS\Setup\ObjectiveIterator\key(), ILIAS\Setup\ObjectiveIterator\next(), ILIAS\Setup\ObjectiveIterator\rewind(), and ILIAS\Setup\ObjectiveIterator\valid().

    {
        if ($this->current === null) {
            throw new \LogicException(
                "Iterator is finished or wasn't initialized correctly internally."
            );
        }
        return $this->current;
    }

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detectDependencyCycles()

ILIAS\Setup\ObjectiveIterator::detectDependencyCycles ( string  $cur, string  $next  )

protected

Definition at line 162 of file ObjectiveIterator.php.

References $d.

Referenced by ILIAS\Setup\ObjectiveIterator\next().

    {
        if (!isset($this->reverse_dependencies[$next])) {
            return;
        }
        if (in_array($cur, $this->reverse_dependencies[$next])) {
            throw new UnachievableException(
                "The objectives contain a dependency cycle and won't all be achievable."
            );
        }
        foreach ($this->reverse_dependencies[$next] as $d) {
            $this->detectDependencyCycles($cur, $d);
        }
    }

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key()

ILIAS\Setup\ObjectiveIterator::key

(

)

Definition at line 98 of file ObjectiveIterator.php.

References ILIAS\Setup\ObjectiveIterator\current().

    {
        return $this->current()->getHash();
    }

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markAsFailed()

ILIAS\Setup\ObjectiveIterator::markAsFailed

(

Objective

$objective

)

Definition at line 67 of file ObjectiveIterator.php.

References ILIAS\Setup\Objective\getHash().

    {
        if (!isset($this->returned[$objective->getHash()])) {
            throw new \LogicException(
                "You may only mark objectives as failed that have been returned by this iterator."
            );
        }

        $this->failed[$objective->getHash()] = true;
    }

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next()

ILIAS\Setup\ObjectiveIterator::next

(

)

Definition at line 103 of file ObjectiveIterator.php.

References ILIAS\Setup\ObjectiveIterator\current(), ILIAS\Setup\ObjectiveIterator\detectDependencyCycles(), and ILIAS\Setup\ObjectiveIterator\setReverseDependency().

Referenced by ILIAS\Setup\ObjectiveIterator\rewind().

    {
        if (count($this->stack) === 0) {
            $this->current = null;
            return;
        }

        $cur = array_pop($this->stack);
        $hash = $cur->getHash();

        if (isset($this->returned[$hash]) || isset($this->filed[$hash])) {
            $this->next();
            return;
        }

        $preconditions = array_filter(
            $cur->getPreconditions($this->environment),
            function ($p) {
                $h = $p->getHash();
                return !isset($this->returned[$h]) || isset($this->failed[$h]);
            }
        );

        $failed_preconditions = array_filter(
            $preconditions,
            function ($p) {
                return isset($this->failed[$p->getHash()]);
            }
        );

        // We only have preconditions left that we know to have failed.
        if (count($preconditions) !== 0
        && count($preconditions) === count($failed_preconditions)) {
            throw new UnachievableException(
                "Objective only has failed preconditions."
            );
        }

        // No preconditions open, we can proceed with the objective.
        if (count($preconditions) === 0) {
            $this->returned[$hash] = true;
            $this->current = $cur;
            return;
        }

        $this->stack[] = $cur;
        $this->detectDependencyCycles($hash, $hash);
        foreach (array_reverse($preconditions) as $p) {
            $this->stack[] = $p;
            $this->setReverseDependency($p->getHash(), $hash);
        }
        $this->next();
    }

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rewind()

ILIAS\Setup\ObjectiveIterator::rewind

(

)

Definition at line 78 of file ObjectiveIterator.php.

References ILIAS\Setup\ObjectiveIterator\$objective, ILIAS\Setup\ObjectiveIterator\current(), and ILIAS\Setup\ObjectiveIterator\next().

Referenced by ILIAS\Setup\ObjectiveIterator\__construct().

    {
        $this->stack = [$this->objective];
        $this->current = null;
        $this->returned = [];
        $this->failed = [];
        $this->reverse_dependencies = [];
        $this->next();
    }

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setEnvironment()

ILIAS\Setup\ObjectiveIterator::setEnvironment

(

Environment

$environment

)

Definition at line 62 of file ObjectiveIterator.php.

References ILIAS\Setup\ObjectiveIterator\$environment, and environment().

                                                             : void
    {
        $this->environment = $environment;
    }

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setReverseDependency()

ILIAS\Setup\ObjectiveIterator::setReverseDependency ( string  $other, string  $cur  )

protected

Definition at line 177 of file ObjectiveIterator.php.

Referenced by ILIAS\Setup\ObjectiveIterator\next().

    {
        if (!isset($this->reverse_dependencies[$other])) {
            $this->reverse_dependencies[$other] = [];
        }
        $this->reverse_dependencies[$other][] = $cur;
    }

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valid()

ILIAS\Setup\ObjectiveIterator::valid

(

)

Definition at line 157 of file ObjectiveIterator.php.

References ILIAS\Setup\ObjectiveIterator\current().

    {
        return $this->current !== null;
    }

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Field Documentation

$current

ILIAS\Setup\ObjectiveIterator::$current

protected

Definition at line 37 of file ObjectiveIterator.php.

Referenced by ILIAS\Setup\ObjectiveIterator\current().

$environment

ILIAS\Setup\ObjectiveIterator::$environment

protected

Definition at line 22 of file ObjectiveIterator.php.

Referenced by ILIAS\Setup\ObjectiveIterator\__construct(), and ILIAS\Setup\ObjectiveIterator\setEnvironment().

$failed

ILIAS\Setup\ObjectiveIterator::$failed

protected

Definition at line 47 of file ObjectiveIterator.php.

$objective

ILIAS\Setup\ObjectiveIterator::$objective

protected

Definition at line 27 of file ObjectiveIterator.php.

Referenced by ILIAS\Setup\ObjectiveIterator\__construct(), and ILIAS\Setup\ObjectiveIterator\rewind().

$returned

ILIAS\Setup\ObjectiveIterator::$returned

protected

Definition at line 42 of file ObjectiveIterator.php.

$reverse_dependencies

ILIAS\Setup\ObjectiveIterator::$reverse_dependencies

protected

Definition at line 52 of file ObjectiveIterator.php.

$stack

ILIAS\Setup\ObjectiveIterator::$stack

protected

Definition at line 32 of file ObjectiveIterator.php.

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The documentation for this class was generated from the following file:

• src/Setup/ObjectiveIterator.php