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<?php

    namespace CzProject\SqlSchema;


    class Schema
    {
        /** @var array  [name => Table] */
        private $tables = array();


        /**
         * @param  string|Table
         * @return Table
         */
        public function addTable($name)
        {
            $table = NULL;

            if ($name instanceof Table) {
                $table = $name;
                $name = $table->getName();

            } else {
                $table = new Table($name);
            }

            if (isset($this->tables[$name])) {
                throw new DuplicateException("Table '$name' already exists.");
            }

            return $this->tables[$name] = $table;
        }


        /**
         * @param  string
         * @return Table|NULL
         */
        public function getTable($name)
        {
            if (isset($this->tables[$name])) {
                return $this->tables[$name];
            }

            return NULL;
        }


        /**
         * @return Table[]
         */
        public function getTables()
        {
            return $this->tables;
        }
    }