FeatureManager.php

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<?php
namespace TYPO3\CMS\Install\Configuration;

class FeatureManager {

    protected $objectManager = NULL;

    protected $featureRegistry = array(
        'TYPO3\\CMS\\Install\\Configuration\\Charset\\CharsetFeature',
        'TYPO3\\CMS\\Install\\Configuration\\Context\\ContextFeature',
        'TYPO3\\CMS\\Install\\Configuration\\Image\\ImageFeature',
        'TYPO3\\CMS\\Install\\Configuration\\ExtbaseObjectCache\\ExtbaseObjectCacheFeature',
    );

    public function getInitializedFeatures(array $postValues) {
        $features = array();
        foreach ($this->featureRegistry as $featureClass) {
            $featureInstance = $this->objectManager->get($featureClass);
            if (!($featureInstance instanceof FeatureInterface)) {
                throw new Exception(
                    'Feature ' . $featureClass . ' doen not implement FeatureInterface',
                    1378644593
                );
            }
            $featureInstance->initializePresets($postValues);
            $features[] = $featureInstance;
        }
        return $features;
    }

    public function getConfigurationForSelectedFeaturePresets(array $postValues) {
        $localConfigurationValuesToSet = array();
        $features = $this->getInitializedFeatures($postValues);
        foreach ($features as $feature) {
            $featureName = $feature->getName();
            $presets = $feature->getPresetsOrderedByPriority();
            foreach ($presets as $preset) {
                $presetName = $preset->getName();
                if (!empty($postValues[$featureName]['enable'])
                    && $postValues[$featureName]['enable'] === $presetName
                    && (!$preset->isActive() || $preset instanceof CustomPresetInterface)
                ) {
                    $localConfigurationValuesToSet = array_merge(
                        $localConfigurationValuesToSet,
                        $preset->getConfigurationValues()
                    );
                }
            }
        }
        return $localConfigurationValuesToSet;
    }

    public function getBestMatchingConfigurationForAllFeatures() {
        $localConfigurationValuesToSet = array();
        $features = $this->getInitializedFeatures(array());
        foreach ($features as $feature) {
            $featureName = $feature->getName();
            $presets = $feature->getPresetsOrderedByPriority();
            foreach ($presets as $preset) {
                // Only choose "normal" presets, no custom presets
                if ($preset instanceof CustomPresetInterface) {
                    break;
                }

                if ($preset->isAvailable()) {
                    $localConfigurationValuesToSet = array_merge(
                        $localConfigurationValuesToSet,
                        $preset->getConfigurationValues()
                    );
                    // Setting for this feature done, go to next feature
                    break;
                }
            }
        }
        return $localConfigurationValuesToSet;
    }
}