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InterDimensionalFallbackGraph.php
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InterDimensionalFallbackGraph.php
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<?php
namespace Neos\ContentRepository\Domain\Model\InterDimension;
/*
* This file is part of the Neos.ContentRepository package.
*
* (c) Contributors of the Neos Project - www.neos.io
*
* This package is Open Source Software. For the full copyright and license
* information, please view the LICENSE file which was distributed with this
* source code.
*/
use Neos\ContentRepository\Domain\Model\IntraDimension;
/**
* The inter dimensional fallback graph domain model
* Represents the fallback mechanism between content subgraphs
*/
class InterDimensionalFallbackGraph
{
/**
* @var array
*/
protected $subgraphs = [];
/**
* @var array|IntraDimension\ContentDimension[]
*/
protected $prioritizedContentDimensions = [];
/**
* @param array $prioritizedContentDimensions
*/
public function __construct(array $prioritizedContentDimensions)
{
$this->prioritizedContentDimensions = $prioritizedContentDimensions;
}
/**
* @param array $dimensionValues
* @return ContentSubgraph
*/
public function createContentSubgraph(array $dimensionValues): ContentSubgraph
{
$subgraph = new ContentSubgraph($dimensionValues);
$this->subgraphs[$subgraph->getIdentityHash()] = $subgraph;
return $subgraph;
}
/**
* @param ContentSubgraph $variant
* @param ContentSubgraph $fallback
* @return VariationEdge
* @throws IntraDimension\Exception\InvalidFallbackException
*/
public function connectSubgraphs(ContentSubgraph $variant, ContentSubgraph $fallback): VariationEdge
{
if ($variant === $fallback) {
throw new IntraDimension\Exception\InvalidFallbackException();
}
return new VariationEdge($variant, $fallback, $this->calculateFallbackWeight($variant, $fallback));
}
/**
* @param ContentSubgraph $variant
* @param ContentSubgraph $fallback
* @return array
*/
public function calculateFallbackWeight(ContentSubgraph $variant, ContentSubgraph $fallback)
{
$weight = [];
foreach ($this->prioritizedContentDimensions as $contentDimension) {
$weight[$contentDimension->getName()] = $variant->getDimensionValue($contentDimension->getName())
->calculateFallbackDepth(
$fallback->getDimensionValue($contentDimension->getName())
);
}
return $weight;
}
/**
* @param array $weight
* @return int
*/
public function normalizeWeight(array $weight): int
{
$base = $this->determineWeightNormalizationBase();
$normalizedWeight = 0;
$exponent = 0;
foreach (array_reverse($weight) as $dimensionName => $dimensionFallbackWeight) {
$normalizedWeight += pow($base, $exponent) * $dimensionFallbackWeight;
$exponent++;
}
return $normalizedWeight;
}
/**
* @return int
*/
public function determineWeightNormalizationBase(): int
{
$base = 0;
foreach ($this->prioritizedContentDimensions as $contentDimension) {
$base = max($base, $contentDimension->getDepth() + 1);
}
return $base;
}
/**
* @param ContentSubgraph $contentSubgraph
* @return ContentSubgraph|null
* @api
*/
public function getPrimaryFallback(ContentSubgraph $contentSubgraph)
{
$fallbackEdges = $contentSubgraph->getFallbackEdges();
if (empty($fallbackEdges)) {
return null;
}
uasort($fallbackEdges, function (VariationEdge $edgeA, VariationEdge $edgeB) {
return $this->normalizeWeight($edgeA->getWeight()) <=> $this->normalizeWeight($edgeB->getWeight());
});
return reset($fallbackEdges)->getFallback();
}
/**
* @return array|ContentSubgraph[]
* @api
*/
public function getSubgraphs(): array
{
return $this->subgraphs;
}
/**
* @param string $identityHash
* @return ContentSubgraph|null
* @api
*/
public function getSubgraph(string $identityHash)
{
return $this->subgraphs[$identityHash] ?: null;
}
}