File: include/datasources/LanguageSource.lib

<?php

/*
    LanguageSource.lib, DomCore, the WebAbility(r) Core System
    Contains the language 3-level cache access object
    (c) 2008-2012 Philippe Thomassigny

    This file is part of DomCore

    DomCore is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    DomCore is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with DomCore.  If not, see <http://www.gnu.org/licenses/>.
*/

/* @UML_Box -- Do not edit
|------------------------------------------------------------------|
| LanguageSource : Language 3-level access object                  |
|------------------------------------------------------------------|
| # originsource : DataSource extended object                      |
| # fastobjectsource : FastObjectSource extended object            |
| # loaded : boolean                                               |
| - tm1 : timestamp of originsource                                |
| - tm2 : timestamp of fastobjectsource                            |
|------------------------------------------------------------------|
| + new LanguageSource($originsource: DataSource, $fastobjectsource: FastObjectSource) |
| + isValid() : boolean                                            |
| + getTimestamp() : integer                                       |
| + read() : mixed                                                 |
| + write($data: mixed) : void                                     |
| + unlink() : void                                                |
|------------------------------------------------------------------|
|------------------------------------------------------------------|
@End_UML_Box */

class LanguageSource extends DataSource
{
  protected $originsource = null;
  protected $fastobjectsource = null;
  protected $loaded = false;

  private $tm1;
  private $tm2;

  public function __construct($originsource, $fastobjectsource)
  {
    parent::__construct(null);

    if (self::$debug || $this->localdebug)
      $this->doDebug("include/datasources/LanguageSource->__construct($originsource, $fastobjectsource)", WADebug::SYSTEM);
    $this->originsource = $originsource;
    $this->fastobjectsource = $fastobjectsource;
  }

  public function isValid()
  {
    if (self::$debug || $this->localdebug)
      $this->doDebug('include/datasources/LanguageSource->isValid()', WADebug::SYSTEM);

    $this->tm1 = $this->originsource->getTimeStamp();
    $this->tm2 = $this->fastobjectsource->getTimeStamp();

    // true if anything has good time
    return ($this->tm1 && $this->tm2 && $this->tm1 <= $this->tm2);
  }

  public function getTimeStamp()
  {
    if (self::$debug || $this->localdebug)
      $this->doDebug('include/datasources/LanguageSource->getTimeStamp()', WADebug::SYSTEM);
    return $this->fastobjectsource->getTimeStamp();
  }

  public function write($data)
  {
    if (self::$debug || $this->localdebug)
      $this->doDebug("include/datasources/LanguageSource->write($data)", WADebug::SYSTEM);

    $this->fastobjectsource->write($data);
    $this->originsource->write($data);
    parent::write($data);
    $this->loaded = true;
  }

  public function read()
  {
    if (self::$debug || $this->localdebug)
      $this->doDebug('include/datasources/LanguageSource->read()', WADebug::SYSTEM);

    if ($this->isValid() && $this->loaded)
      return $this->data;

    // we sinchronize
    // origin source is new, we recalculate all the chain
    if ($this->tm1 > $this->tm2)
    {
      parent::write(new WALanguage($this->originsource->read()));
      $this->fastobjectsource->write($this->data);
    }
    elseif ($this->tm2 > $this->timestamp)
    {
      parent::write($this->fastobjectsource->read());
    }
    $this->loaded = true;
    return $this->data;
  }

  // destroy anything
  public function unlink()
  {
    if (self::$debug || $this->localdebug)
      $this->doDebug('include/datasource/LanguageSource->unlink()', WADebug::SYSTEM);
    $this->originsource->unlink();
    $this->fastobjectsource->unlink();
    parent::unlink();
  }

}

?>