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<?php
/*
* This file belongs to the package "TYPO3 Fluid".
* See LICENSE.txt that was shipped with this package.
*/
namespace TYPO3Fluid\Fluid\Core\Variables;
/**
* Allows chaining any number of prioritised VariableProviders
* to be consulted whenever a variable is requested. First
* VariableProvider to return a value "wins".
*/
class ChainedVariableProvider extends StandardVariableProvider implements VariableProviderInterface
{
/**
* @var VariableProviderInterface[]
*/
protected $variableProviders = [];
/**
* @param array $variableProviders
*/
public function __construct(array $variableProviders = [])
{
$this->variableProviders = $variableProviders;
}
/**
* @return array
*/
public function getAll()
{
$merged = [];
foreach (array_reverse($this->variableProviders) as $provider) {
$merged = array_replace_recursive($merged, $provider->getAll());
}
return array_merge($merged, $this->variables);
}
/**
* @param string $identifier
* @return mixed
*/
public function get($identifier)
{
if (array_key_exists($identifier, $this->variables)) {
return $this->variables[$identifier];
}
foreach ($this->variableProviders as $provider) {
$value = $provider->get($identifier);
if ($value !== null) {
return $value;
}
}
return null;
}
/**
* @param string $path
* @return mixed|null
*/
public function getByPath($path)
{
if (array_key_exists($path, $this->variables)) {
return $this->variables[$path];
}
// We did not resolve with native StandardVariableProvider. Let's try the chain.
foreach ($this->variableProviders as $provider) {
$value = $provider->getByPath($path);
if ($value !== null) {
return $value;
}
}
return null;
}
/**
* @return array
*/
public function getAllIdentifiers()
{
$merged = parent::getAllIdentifiers();
foreach ($this->variableProviders as $provider) {
$merged = array_replace_recursive($merged, $provider->getAllIdentifiers());
}
return array_values(array_unique($merged));
}
/**
* @param array|\ArrayAccess $variables
* @return ChainedVariableProvider
*/
public function getScopeCopy($variables)
{
$clone = clone $this;
$clone->setSource($variables);
return $clone;
}
}