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<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\Framework\Data\Argument\Interpreter;
use Magento\Framework\Data\Argument\InterpreterInterface;
/**
* Interpreter that aggregates named interpreters and delegates every evaluation to one of them
*/
class Composite implements InterpreterInterface
{
/**
* Format: array('<name>' => <instance>, ...)
*
* @var InterpreterInterface[]
*/
private $interpreters;
/**
* Data key that holds name of an interpreter to be used for that data
*
* @var string
*/
private $discriminator;
/**
* @param InterpreterInterface[] $interpreters
* @param string $discriminator
* @throws \InvalidArgumentException
*/
public function __construct(array $interpreters, $discriminator)
{
foreach ($interpreters as $interpreterName => $interpreterInstance) {
if (!$interpreterInstance instanceof InterpreterInterface) {
throw new \InvalidArgumentException(
"Interpreter named '{$interpreterName}' is expected to be an argument interpreter instance."
);
}
}
$this->interpreters = $interpreters;
$this->discriminator = $discriminator;
}
/**
* {@inheritdoc}
* @throws \InvalidArgumentException
*/
public function evaluate(array $data)
{
if (!isset($data[$this->discriminator])) {
throw new \InvalidArgumentException(
sprintf('Value for key "%s" is missing in the argument data.', $this->discriminator)
);
}
$interpreterName = $data[$this->discriminator];
unset($data[$this->discriminator]);
$interpreter = $this->getInterpreter($interpreterName);
return $interpreter->evaluate($data);
}
/**
* Register interpreter instance under a given unique name
*
* @param string $name
* @param InterpreterInterface $instance
* @return void
* @throws \InvalidArgumentException
*/
public function addInterpreter($name, InterpreterInterface $instance)
{
if (isset($this->interpreters[$name])) {
throw new \InvalidArgumentException("Argument interpreter named '{$name}' has already been defined.");
}
$this->interpreters[$name] = $instance;
}
/**
* Retrieve interpreter instance by its unique name
*
* @param string $name
* @return InterpreterInterface
* @throws \InvalidArgumentException
*/
protected function getInterpreter($name)
{
if (!isset($this->interpreters[$name])) {
throw new \InvalidArgumentException("Argument interpreter named '{$name}' has not been defined.");
}
return $this->interpreters[$name];
}
}