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<?php
namespace Dotenv\Environment;
use Dotenv\Environment\Adapter\ArrayAdapter;
use InvalidArgumentException;
/**
* This is the abstract variables implementation.
*
* Extend this as required, implementing "get", "set", and "clear".
*/
abstract class AbstractVariables implements VariablesInterface
{
/**
* Are we immutable?
*
* @var bool
*/
private $immutable;
/**
* The record of loaded variables.
*
* @var \Dotenv\Environment\Adapter\ArrayAdapter
*/
private $loaded;
/**
* Create a new environment variables instance.
*
* @param bool $immutable
*
* @return void
*/
public function __construct($immutable)
{
$this->immutable = $immutable;
$this->loaded = new ArrayAdapter();
}
/**
* Get an environment variable.
*
* @param string $name
*
* @throws \InvalidArgumentException
*
* @return string|null
*/
public function get($name)
{
if (!is_string($name)) {
throw new InvalidArgumentException('Expected name to be a string.');
}
return $this->getInternal($name);
}
/**
* Get an environment variable.
*
* @param string $name
*
* @return string|null
*/
abstract protected function getInternal($name);
/**
* Set an environment variable.
*
* @param string $name
* @param string|null $value
*
* @throws \InvalidArgumentException
*
* @return void
*/
public function set($name, $value = null)
{
if (!is_string($name)) {
throw new InvalidArgumentException('Expected name to be a string.');
}
// Don't overwrite existing environment variables if we're immutable
// Ruby's dotenv does this with `ENV[key] ||= value`.
if ($this->isImmutable() && $this->get($name) !== null && $this->loaded->get($name)->isEmpty()) {
return;
}
$this->setInternal($name, $value);
$this->loaded->set($name, '');
}
/**
* Set an environment variable.
*
* @param string $name
* @param string|null $value
*
* @return void
*/
abstract protected function setInternal($name, $value = null);
/**
* Clear an environment variable.
*
* @param string $name
*
* @throws \InvalidArgumentException
*
* @return void
*/
public function clear($name)
{
if (!is_string($name)) {
throw new InvalidArgumentException('Expected name to be a string.');
}
// Don't clear anything if we're immutable.
if ($this->isImmutable()) {
return;
}
$this->clearInternal($name);
}
/**
* Clear an environment variable.
*
* @param string $name
*
* @return void
*/
abstract protected function clearInternal($name);
/**
* Determine if the environment is immutable.
*
* @return bool
*/
public function isImmutable()
{
return $this->immutable;
}
/**
* Tells whether environment variable has been defined.
*
* @param string $name
*
* @return bool
*/
public function has($name)
{
return is_string($name) && $this->get($name) !== null;
}
/**
* {@inheritdoc}
*/
public function offsetExists($offset)
{
return $this->has($offset);
}
/**
* {@inheritdoc}
*/
public function offsetGet($offset)
{
return $this->get($offset);
}
/**
* {@inheritdoc}
*/
public function offsetSet($offset, $value)
{
$this->set($offset, $value);
}
/**
* {@inheritdoc}
*/
public function offsetUnset($offset)
{
$this->clear($offset);
}
}