<?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) 2013 (original work) Open Assessment Technologies SA (under the project TAO-PRODUCT);
 *
 */

use oat\tao\model\WfEngineOntology;
use \oat\generis\model\data\Ontology;

/**
 * Represents tao service parameter
 *
 * @access public
 * @author Joel Bout, <joel@taotesting.com>
 * @package tao

 */
class tao_models_classes_service_ConstantParameter extends tao_models_classes_service_Parameter
{
    /**
     * @var string
     */
    private $value;
    
    /**
     * Instantiates a parameter that takes
     * a constant value
     *
     * @param core_kernel_classes_Resource $definition
     * @param string $value
     */
    public function __construct(core_kernel_classes_Resource $definition, $value)
    {
        parent::__construct($definition);
        $this->value = is_object($value) && $value instanceof core_kernel_classes_Resource ? $value->getUri() : (string)$value;
    }
    
    /**
     * Returns the actual value associated to this parameter
     *
     * @return string
     */
    public function getValue()
    {
        return $this->value;
    }
    
    /**
     * (non-PHPdoc)
     * @see tao_models_classes_service_Parameter::serialize()
     */
    public function toOntology(Ontology $model)
    {
        $serviceCallClass = $model->getClass(WfEngineOntology::CLASS_URI_ACTUAL_PARAMETER);
        $resource = $serviceCallClass->createInstanceWithProperties([
            WfEngineOntology::PROPERTY_ACTUAL_PARAMETER_FORMAL_PARAMETER    => $this->getDefinition(),
            WfEngineOntology::PROPERTY_ACTUAL_PARAMETER_CONSTANT_VALUE      => $this->value
        ]);
        return $resource;
    }

    public function jsonSerialize()
    {
        return [
            'def' => $this->getDefinition()->getUri(),
            'const' => $this->getValue()
        ];
    }
}