ValueContainer.php

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<?php
 
/*
 * This file is part of the Assetic package, an OpenSky project.
 *
 * (c) 2010-2014 OpenSky Project Inc
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
 
namespace Assetic\Extension\Twig;
 
use Assetic\ValueSupplierInterface;
 
class ValueContainer implements \ArrayAccess, \IteratorAggregate, \Countable
{
    private $values;
    private $valueSupplier;
 
    public function __construct(ValueSupplierInterface $valueSupplier)
    {
        $this->valueSupplier = $valueSupplier;
    }
 
    public function offsetExists($offset)
    {
        $this->initialize();
 
        return array_key_exists($offset, $this->values);
    }
 
    public function offsetGet($offset)
    {
        $this->initialize();
 
        if (!array_key_exists($offset, $this->values)) {
            throw new \OutOfRangeException(sprintf('The variable "%s" does not exist.', $offset));
        }
 
        return $this->values[$offset];
    }
 
    public function offsetSet($offset, $value)
    {
        throw new \BadMethodCallException('The ValueContainer is read-only.');
    }
 
    public function offsetUnset($offset)
    {
        throw new \BadMethodCallException('The ValueContainer is read-only.');
    }
 
    public function getIterator()
    {
        $this->initialize();
 
        return new \ArrayIterator($this->values);
    }
 
    public function count()
    {
        $this->initialize();
 
        return count($this->values);
    }
 
    private function initialize()
    {
        if (null === $this->values) {
            $this->values = $this->valueSupplier->getValues();
        }
    }
}