<?php
/**
 * This program 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; under version 2
 * of the License (non-upgradable).
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2002-2008 (original work) Public Research Centre Henri Tudor & University of Luxembourg (under the project TAO & TAO2);
 *               2008-2010 (update and modification) Deutsche Institut für Internationale Pädagogische Forschung (under the project TAO-TRANSFER);
*               2009-2012 (update and modification) Public Research Centre Henri Tudor (under the project TAO-SUSTAIN & TAO-DEV);
 *
 */

/**
 * Short description of class common_cache_PartitionedCachable
 *
 * @abstract
 * @access public
 * @author Jerome Bogaerts, <jerome.bogaerts@tudor.lu>
 * @package generis

 */
abstract class common_cache_PartitionedCachable implements common_Serializable
{
    // --- ASSOCIATIONS ---


    // --- ATTRIBUTES ---

    /**
     * Short description of attribute serial
     *
     * @access protected
     * @var string
     */
    protected $serial = '';

    /**
     * Short description of attribute serializedProperties
     *
     * @access protected
     * @var array
     */
    protected $serializedProperties = [];

    // --- OPERATIONS ---

    /**
     * Obtain a serial for the instance of the class that implements the
     *
     * @access public
     * @author Jerome Bogaerts, <jerome.bogaerts@tudor.lu>
     * @return string
     */
    public function getSerial()
    {
        $returnValue = (string) '';

        
        if (empty($this->serial)) {
            $this->serial = $this->buildSerial();
        }
        $returnValue = $this->serial;
        

        return (string) $returnValue;
    }

    /**
     * Short description of method __construct
     *
     * @access public
     * @author Jerome Bogaerts, <jerome.bogaerts@tudor.lu>
     * @return mixed
     */
    public function __construct()
    {
        
        if (!is_null($this->getCache())) {
            $this->getCache()->put($this);
        }
    }

    /**
     * Gives the list of attributes to serialize by reflection.
     *
     * @access public
     * @author Jerome Bogaerts, <jerome.bogaerts@tudor.lu>
     * @return array
     */
    public function __sleep()
    {
        $returnValue = [];

        
        $this->serializedProperties = [];
        $reflection = new ReflectionClass($this);
        foreach ($reflection->getProperties() as $property) {
            //assuming that private properties don't contain serializables
            if (!$property->isStatic() && !$property->isPrivate()) {
                $propertyName = $property->getName();
                $containsSerializable = false;
                $value = $this->$propertyName;
                if (is_array($value)) {
                    $containsNonSerializable = false;
                    $serials = [];
                    foreach ($value as $key => $subvalue) {
                        if (is_object($subvalue) && $subvalue instanceof self) {
                            $containsSerializable = true;
                            $serials[$key] = $subvalue->getSerial();
                        } else {
                            $containsNonSerializable = true;
                        }
                    }
                    if ($containsNonSerializable && $containsSerializable) {
                        throw new common_exception_Error('Serializable ' . $this->getSerial() . ' mixed serializable and non serializable values in property ' . $propertyName);
                    }
                } else {
                    if (is_object($value) && $value instanceof self) {
                        $containsSerializable = true;
                        $serials = $value->getSerial();
                    }
                }
                if ($containsSerializable) {
                    $this->serializedProperties[$property->getName()] = $serials;
                } else {
                    $returnValue[] = $property->getName();
                }
            }
        }
        

        return (array) $returnValue;
    }

    /**
     * Short description of method __wakeup
     *
     * @access public
     * @author Jerome Bogaerts, <jerome.bogaerts@tudor.lu>
     * @return mixed
     */
    public function __wakeup()
    {
        
        foreach ($this->serializedProperties as $key => $value) {
            if (is_array($value)) {
                $restored = [];
                foreach ($value as $arrayKey => $arrayValue) {
                    $restored[$arrayKey] = $this->getCache()->get($arrayValue);
                }
            } else {
                $restored = $this->getCache()->get($value);
            }
            $this->$key = $restored;
        }
        $this->serializedProperties = [];
    }

    /**
     * Short description of method _remove
     *
     * @access public
     * @author Jerome Bogaerts, <jerome.bogaerts@tudor.lu>
     * @return mixed
     */
    public function _remove()
    {
        
        //usefull only when persistance is enabled
        if (!is_null($this->getCache())) {
            //clean session
            $this->getCache()->remove($this->getSerial());
        }
    }

    /**
     * Short description of method getSuccessors
     *
     * @access public
     * @author Jerome Bogaerts, <jerome.bogaerts@tudor.lu>
     * @return array
     */
    public function getSuccessors()
    {
        $returnValue = [];

        
        $reflection = new ReflectionClass($this);
        foreach ($reflection->getProperties() as $property) {
            if (!$property->isStatic() && !$property->isPrivate()) {
                $propertyName = $property->getName();
                $value = $this->$propertyName;
                if (is_array($value)) {
                    foreach ($value as $key => $subvalue) {
                        if (is_object($subvalue) && $subvalue instanceof self) {
                                $returnValue[] = $subvalue;
                        }
                    }
                } elseif (is_object($value) && $value instanceof self) {
                        $returnValue[] = $value;
                }
            }
        }
        

        return (array) $returnValue;
    }

    /**
     * Short description of method getPredecessors
     *
     * @access public
     * @author Jerome Bogaerts, <jerome.bogaerts@tudor.lu>
     * @param  string classFilter
     * @return array
     */
    public function getPredecessors($classFilter = null)
    {
        $returnValue = [];

        
        foreach ($this->getCache()->getAll() as $serial => $instance) {
            if (
                ($classFilter == null || $instance instanceof $classFilter)
                && in_array($this, $instance->getSuccessors())
            ) {
                $returnValue[] = $instance;
                break;
            }
        }
        

        return (array) $returnValue;
    }

    /**
     * Short description of method buildSerial
     *
     * @abstract
     * @access protected
     * @author Jerome Bogaerts, <jerome.bogaerts@tudor.lu>
     * @return string
     */
    abstract protected function buildSerial();

    /**
     * Short description of method getCache
     *
     * @abstract
     * @access public
     * @author Jerome Bogaerts, <jerome.bogaerts@tudor.lu>
     * @return common_cache_Cache
     */
    abstract public function getCache();
} /* end of abstract class common_cache_PartitionedCachable */