TypeMapper.php

<?php

/**
 * EasyRdf
 *
 * LICENSE
 *
 * Copyright (c) 2009-2010 Nicholas J Humfrey.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author 'Nicholas J Humfrey" may be used to endorse or
 *    promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * @package    EasyRdf
 * @copyright  Copyright (c) 2009-2010 Nicholas J Humfrey
 * @license    http://www.opensource.org/licenses/bsd-license.php
 * @version    $Id$
 */

/**
 * Class to map between RDF Types and PHP Classes
 *
 * @package    EasyRdf
 * @copyright  Copyright (c) 2009-2010 Nicholas J Humfrey
 * @license    http://www.opensource.org/licenses/bsd-license.php
 */
class EasyRdf_TypeMapper {

  /** The type map registry */
  private static $map = array();

  /** Get the registered class for an RDF type
   *
   * If a type is not registered, then this method will return null.
   *
   * @param  string  $type   The RDF type (e.g. foaf:Person)
   * @return string          The class name (e.g. Model_Foaf_Name)
   */
  public static function get($type) {
    if (!is_string($type) or $type == null or $type == '') {
      throw new InvalidArgumentException("\$type should be a string and cannot be null or empty");
    }
    $type = EasyRdf_Namespace::expand($type);
    if (array_key_exists($type, self::$map)) {
      return self::$map[$type];
    }
    else {
      return null;
    }
  }

  /** Register an RDF type with a PHP Class name
   *
   * @param  string  $type   The RDF type (e.g. foaf:Person)
   * @param  string  $class  The PHP class name (e.g. Model_Foaf_Name)
   * @return string          The PHP class name
   */
  public static function set($type, $class) {
    if (!is_string($type) or $type == null or $type == '') {
      throw new InvalidArgumentException("\$type should be a string and cannot be null or empty");
    }
    if (!is_string($class) or $class == null or $class == '') {
      throw new InvalidArgumentException("\$class should be a string and cannot be null or empty");
    }
    $type = EasyRdf_Namespace::expand($type);
    return self::$map[$type] = $class;
  }

  /**
   * Delete an existing RDF type mapping.
   *
   * @param  string  $type   The RDF type (e.g. foaf:Person)
   */
  public static function delete($type) {
    if (!is_string($type) or $type == null or $type == '') {
      throw new InvalidArgumentException("\$type should be a string and cannot be null or empty");
    }
    $type = EasyRdf_Namespace::expand($type);
    if (isset(self::$map[$type])) {
      unset(self::$map[$type]);
    }
  }

}