Collection.php

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<?php
namespace Magento\Framework\View\Asset;

class Collection
{
    protected $assets = [];

    public function add($identifier, AssetInterface $asset)
    {
        $this->assets[$identifier] = $asset;
    }

    public function insert($identifier, AssetInterface $asset, $key)
    {
        $result = [];
        foreach ($this->assets as $assetKey => $assetVal) {
            if ($assetKey == $key) {
                $result[$key] = $assetVal;
                $result[$identifier] = $asset;
            } else {
                $result[$assetKey] = $assetVal;
            }
        }

        $this->assets = $result;
    }

    public function has($identifier)
    {
        return isset($this->assets[$identifier]);
    }

    public function remove($identifier)
    {
        unset($this->assets[$identifier]);
    }

    public function getAll()
    {
        return $this->assets;
    }
}