<?php

namespace Delight\Db;

/**
 * DSN for use with PHP's built-in PDO
 */
final class PdoDsn implements Dsn
{
    /** @var string the DSN as a string */
    private $dsn;

    /** @var string|null the username that complements the DSN */
    private $username;

    /** @var string|null the password that complements the DSN */
    private $password;

    /**
     * Constructor
     *
     * @param string $dsnStr the DSN as a string
     * @param string $username (optional) the username that complements the DSN
     * @param string $password (optional) the password that complements the DSN
     */
    public function __construct($dsnStr, $username = null, $password = null)
    {
        $this->dsn = (string) $dsnStr;
        $this->username = (string) $username;
        $this->password = (string) $password;
    }

    /**
     * Returns the DSN as a string
     *
     * @return string
     */
    public function getDsn()
    {
        return $this->dsn;
    }

    /**
     * Returns the username that complements the DSN
     *
     * @return string|null
     */
    public function getUsername()
    {
        return $this->username;
    }

    /**
     * Returns the password that complements the DSN
     *
     * @return string|null
     */
    public function getPassword()
    {
        return $this->password;
    }
}
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