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<?php

    namespace CzProject\SqlSchema;


    class IndexColumn
    {
        const ASC = 'ASC';
        const DESC = 'DESC';

        /** @var string */
        private $name;

        /** @var string */
        private $order;

        /** @var int|NULL */
        private $length;


        /**
         * @param  string
         * @param  string
         * @param  int|NULL
         */
        public function __construct($name, $order = self::ASC, $length = NULL)
        {
            $this->setName($name);
            $this->setOrder($order);
            $this->setLength($length);
        }


        /**
         * @param  string
         * @return self
         */
        public function setName($name)
        {
            $this->name = $name;
            return $this;
        }


        /**
         * @return string
         */
        public function getName()
        {
            return $this->name;
        }


        /**
         * @param  string
         * @return self
         */
        public function setOrder($order)
        {
            $order = (string) $order;

            if ($order !== self::ASC && $order !== self::DESC) {
                throw new OutOfRangeException("Order type '$order' not found.");
            }

            $this->order = $order;
            return $this;
        }


        /**
         * @return string
         */
        public function getOrder()
        {
            return $this->order;
        }


        /**
         * @param  int|NULL
         * @return self
         */
        public function setLength($length)
        {
            $this->length = $length;
            return $this;
        }


        /**
         * @return int|NULL
         */
        public function getLength()
        {
            return $this->length;
        }
    }