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<?php
/**
* TCache and cache dependency classes.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link https://github.com/pradosoft/prado
* @license https://github.com/pradosoft/prado/blob/master/LICENSE
*/
namespace Prado\Caching;
use Prado\Collections\TList;
use Prado\Exceptions\TInvalidDataTypeException;
/**
* TCacheDependencyList class.
*
* TCacheDependencyList represents a list of cache dependency objects.
* Only objects implementing {@link ICacheDependency} can be added into this list.
*
* TCacheDependencyList can be used like an array. See {@link TList}
* for more details.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 3.1.0
*/
class TCacheDependencyList extends TList
{
/**
* Inserts an item at the specified position.
* This overrides the parent implementation by performing additional type checking
* for each newly added item.
* @param int $index the specified position.
* @param mixed $item new item
* @throws TInvalidDataTypeException if the item to be inserted is not a dependency instance
*/
public function insertAt($index, $item)
{
if ($item instanceof ICacheDependency) {
parent::insertAt($index, $item);
} else {
throw new TInvalidDataTypeException('cachedependencylist_cachedependency_required');
}
}
}