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<?php

namespace Illuminate\Database\Connectors;

use PDO;
use Exception;
use Illuminate\Support\Arr;
use Illuminate\Database\DetectsLostConnections;

class Connector
{
    use DetectsLostConnections;

/**
     * The default PDO connection options.
     *
     * @var array
     */
    protected $options = [
        PDO::ATTR_CASE => PDO::CASE_NATURAL,
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_ORACLE_NULLS => PDO::NULL_NATURAL,
        PDO::ATTR_STRINGIFY_FETCHES => false,
        PDO::ATTR_EMULATE_PREPARES => false,
    ];

/**
     * Get the PDO options based on the configuration.
     *
     * @param  array  $config
     * @return array
     */
    public function getOptions(array $config)
    {
        $options = Arr::get($config, 'options', []);

return array_diff_key($this->options, $options) + $options;
    }

/**
     * Create a new PDO connection.
     *
     * @param  string  $dsn
     * @param  array   $config
     * @param  array   $options
     * @return \PDO
     */
    public function createConnection($dsn, array $config, array $options)
    {
        $username = Arr::get($config, 'username');

$password = Arr::get($config, 'password');

try {
            $pdo = new PDO($dsn, $username, $password, $options);
        } catch (Exception $e) {
            $pdo = $this->tryAgainIfCausedByLostConnection(
                $e, $dsn, $username, $password, $options
            );
        }

return $pdo;
    }

/**
     * Get the default PDO connection options.
     *
     * @return array
     */
    public function getDefaultOptions()
    {
        return $this->options;
    }

/**
     * Set the default PDO connection options.
     *
     * @param  array  $options
     * @return void
     */
    public function setDefaultOptions(array $options)
    {
        $this->options = $options;
    }

/**
     * Handle a exception that occurred during connect execution.
     *
     * @param  \Exception  $e
     * @param  string  $dsn
     * @param  string  $username
     * @param  string  $password
     * @param  array   $options
     * @return \PDO
     *
     * @throws \Exception
     */
    protected function tryAgainIfCausedByLostConnection(Exception $e, $dsn, $username, $password, $options)
    {
        if ($this->causedByLostConnection($e)) {
            return new PDO($dsn, $username, $password, $options);
        }

throw $e;
    }
}