<?php
/**
* Cache.php
*
* Cache for callable class metadata.
*
* @package jaxon-core
* @author Thierry Feuzeu <thierry.feuzeu@gmail.com>
* @copyright 2024 Thierry Feuzeu <thierry.feuzeu@gmail.com>
* @license https://opensource.org/licenses/BSD-3-Clause BSD 3-Clause License
* @link https://github.com/jaxon-php/jaxon-core
*/
namespace Jaxon\App\Metadata;
use Closure;
use function dirname;
use function file_exists;
use function file_put_contents;
use function implode;
use function mkdir;
use function rtrim;
use function str_replace;
use function strtolower;
use function trim;
class MetadataCache
{
/**
* @param string $sCacheDir
*/
public function __construct(private string $sCacheDir)
{}
/**
* @param string $sClass
*
* @return string
*/
private function filepath(string $sClass): string
{
$sFilename = trim(str_replace(['\\', '.'], DIRECTORY_SEPARATOR,
strtolower($sClass)), DIRECTORY_SEPARATOR);
return rtrim($this->sCacheDir, "/\\") . DIRECTORY_SEPARATOR .
"metadata" . DIRECTORY_SEPARATOR . "{$sFilename}.php";
}
/**
* Generate the PHP code to create a metadata object.
*
* @return array
*/
private function encode(Metadata $xMetadata): array
{
$sMetadataVar = '$xMetadata';
$sDataVar = '$xData';
$aCalls = ["$sMetadataVar = new " . Metadata::class . '();'];
foreach($xMetadata->getAttributes() as $sType => $aValues)
{
foreach($aValues as $sMethod => $xData)
{
$aCalls[] = "$sDataVar = {$sMetadataVar}->{$sType}('{$sMethod}');";
foreach($xData->encode($sDataVar) as $sCall)
{
$aCalls[] = $sCall;
}
}
}
$aCalls[] = "return $sMetadataVar;";
return $aCalls;
}
/**
* @param string $sClass
* @param Metadata $xMetadata
*
* @return void
*/
public function save(string $sClass, Metadata $xMetadata): void
{
$sDataCode = implode("\n ", $this->encode($xMetadata));
$sPhpCode = <<<CODE
<?php
return function() {
$sDataCode
};
CODE;
// Recursively create the directories.
$sPath = $this->filepath($sClass);
@mkdir(dirname($sPath), 0755, true);
file_put_contents($sPath, $sPhpCode);
}
/**
* @param string $sClass
*
* @return Metadata|null
*/
public function read(string $sClass): ?Metadata
{
$sPath = $this->filepath($sClass);
$fCreator = file_exists($sPath) ? require $sPath : null;
return $fCreator instanceof Closure ? $fCreator() : null;
}
}
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