SitesCacheFileBuilder.php

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<?php
 
class SitesCacheFileBuilder {
 
    private $siteLookup;
 
    private $cacheFile;
 
    public function __construct( SiteLookup $siteLookup, $cacheFile ) {
        $this->siteLookup = $siteLookup;
        $this->cacheFile = $cacheFile;
    }
 
    public function build() {
        $this->sites = $this->siteLookup->getSites();
        $this->cacheSites( $this->sites->getArrayCopy() );
    }
 
    private function cacheSites( array $sites ) {
        $sitesArray = [];
 
        foreach ( $sites as $site ) {
            $globalId = $site->getGlobalId();
            $sitesArray[$globalId] = $this->getSiteAsArray( $site );
        }
 
        $json = json_encode( [
            'sites' => $sitesArray
        ] );
 
        $result = file_put_contents( $this->cacheFile, $json );
 
        return $result !== false;
    }
 
    private function getSiteAsArray( Site $site ) {
        $siteEntry = unserialize( $site->serialize() );
        $siteIdentifiers = $this->buildLocalIdentifiers( $site );
        $identifiersArray = [];
 
        foreach ( $siteIdentifiers as $identifier ) {
            $identifiersArray[] = $identifier;
        }
 
        $siteEntry['identifiers'] = $identifiersArray;
 
        return $siteEntry;
    }
 
    private function buildLocalIdentifiers( Site $site ) {
        $localIds = [];
 
        foreach ( $site->getLocalIds() as $idType => $ids ) {
            foreach ( $ids as $id ) {
                $localIds[] = [
                    'type' => $idType,
                    'key' => $id
                ];
            }
        }
 
        return $localIds;
    }
 
}