<?php
/**
 * This source file is part of the open source project
 * ExpressionEngine (https://expressionengine.com)
 *
 * @link      https://expressionengine.com/
 * @copyright Copyright (c) 2003-2022, Packet Tide, LLC (https://www.packettide.com)
 * @license   https://expressionengine.com/license Licensed under Apache License, Version 2.0
 */

/**
 * DataStructure Index
 */
class Index
{
    protected $index;
    protected $predicate;

    public function __construct(Closure $predicate)
    {
        $this->index = array();
        $this->predicate = $predicate;
    }

    public function fill($items)
    {
        foreach ($items as $item) {
            $this->add($item);
        }
    }

    public function add($item)
    {
        $predicate = $this->predicate;

        $this->index[$predicate($item)] = $item;
    }

    public function get($key)
    {
        return $this->has($key) ? $this->index[$key] : null;
    }

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

// EOF
