<?php

/**
 * This file is part of the Propel package.
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @license    MIT License
 */

/**
 * DatabaseMap is used to model a database.
 *
 * GENERAL NOTE
 * ------------
 * The propel.map classes are abstract building-block classes for modeling
 * the database at runtime.  These classes are similar (a lite version) to the
 * propel.engine.database.model classes, which are build-time modeling classes.
 * These classes in themselves do not do any database metadata lookups.
 *
 * @author     Hans Lellelid <hans@xmpl.org> (Propel)
 * @author     John D. McNally <jmcnally@collab.net> (Torque)
 * @author     Daniel Rall <dlr@collab.net> (Torque)
 * @version    $Revision$
 * @package    propel.runtime.map
 */
class DatabaseMap
{
    /** @var string Name of the database. */
    protected $name;

    /** @var array TableMap[] Tables in the database, using table name as key */
    protected $tables = array();

    /** @var array TableMap[] Tables in the database, using table phpName as key */
    protected $tablesByPhpName = array();

    /**
     * Constructor.
     *
     * @param string $name Name of the database.
     */
    public function __construct($name)
    {
        $this->name = $name;
    }

    /**
     * Get the name of this database.
     *
     * @return string The name of the database.
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Add a new table to the database by name.
     *
     * @param string $tableName The name of the table.
     *
     * @return TableMap The newly created TableMap.
     */
    public function addTable($tableName)
    {
        $this->tables[$tableName] = new TableMap($tableName, $this);

        return $this->tables[$tableName];
    }

    /**
     * Add a new table object to the database.
     *
     * @param TableMap $table The table to add
     */
    public function addTableObject(TableMap $table)
    {
        $table->setDatabaseMap($this);
        $this->tables[$table->getName()] = $table;
        $this->tablesByPhpName[$table->getClassname()] = $table;
    }

    /**
     * Add a new table to the database, using the tablemap class name.
     *
     * @param string $tableMapClass The name of the table map to add
     *
     * @return TableMap The TableMap object
     */
    public function addTableFromMapClass($tableMapClass)
    {
        $table = new $tableMapClass();
        if (!$this->hasTable($table->getName())) {
            $this->addTableObject($table);

            return $table;
        } else {
            return $this->getTable($table->getName());
        }
    }

    /**
     * Does this database contain this specific table?
     *
     * @param string $name The String representation of the table.
     *
     * @return boolean True if the database contains the table.
     */
    public function hasTable($name)
    {
        return array_key_exists($name, $this->tables);
    }

    /**
     * Get a TableMap for the table by name.
     *
     * @param string $name Name of the table.
     *
     * @return TableMap        A TableMap
     * @throws PropelException if the table is undefined
     */
    public function getTable($name)
    {
        if (!isset($this->tables[$name])) {
            throw new PropelException("Cannot fetch TableMap for undefined table: " . $name);
        }

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

    /**
     * Get a TableMap[] of all of the tables in the database.
     *
     * @return array A TableMap[].
     */
    public function getTables()
    {
        return $this->tables;
    }

    /**
     * Get a ColumnMap for the column by name.
     * Name must be fully qualified, e.g. book.AUTHOR_ID
     *
     * @param   $qualifiedColumnName Name of the column.
     *
     * @return ColumnMap       A TableMap
     * @throws PropelException if the table is undefined, or if the table is undefined
     */
    public function getColumn($qualifiedColumnName)
    {
        list($tableName, $columnName) = explode('.', $qualifiedColumnName);

        return $this->getTable($tableName)->getColumn($columnName, false);
    }

    // deprecated methods

    /**
     * Does this database contain this specific table?
     *
     * @deprecated Use hasTable() instead
     *
     * @param string $name The String representation of the table.
     *
     * @return boolean True if the database contains the table.
     */
    public function containsTable($name)
    {
        return $this->hasTable($name);
    }

    public function getTableByPhpName($phpName)
    {
        if (array_key_exists($phpName, $this->tablesByPhpName)) {
            return $this->tablesByPhpName[$phpName];
        } elseif (defined($phpName . '::PEER')) {
            $peerClass = constant($phpName . '::PEER');
            $tmClass = constant($peerClass . '::TM_CLASS');

            $this->addTableFromMapClass($tmClass);

            return $this->tablesByPhpName[$phpName];
        } else {
            throw new PropelException("Cannot fetch TableMap for undefined table phpName: " . $phpName);
        }
    }

    /**
     * Convenience method to get the DBAdapter registered with Propel for this database.
     *
     * @return DBAdapter
     * @see     Propel::getDB(string)
     */
    public function getDBAdapter()
    {
        return Propel::getDB($this->name);
    }
}
