app/code/core/Mage/Bundle/Model/Option.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Bundle
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Bundle Option Model
 *
 * @category    Mage
 * @package     Mage_Bundle
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Bundle_Model_Option extends Mage_Core_Model_Abstract
{
    /**
     * Default selection object
     *
     * @var Mage_Bundle_Model_Selection
     */
    protected $_defaultSelection = null;

    /**
     * Initialize resource model
     *
     */
    protected function _construct()
    {
        $this->_init('bundle/option');
        parent::_construct();
    }

    /**
     * Add selection to option
     *
     * @param Mage_Bundle_Model_Selection $selection
     * @return Mage_Bundle_Model_Option
     */
    public function addSelection($selection)
    {
        if (!$selection) {
            return false;
        }
        if (!$selections = $this->getData('selections')) {
            $selections = array();
        }
        array_push($selections, $selection);
        $this->setSelections($selections);
        return $this;
    }

    /**
     * Check Is Saleable Option
     *
     * @return bool
     */
    public function isSaleable()
    {
        $saleable = 0;
        if ($this->getSelections()) {
            foreach ($this->getSelections() as $selection) {
                if ($selection->isSaleable()) {
                    $saleable++;
                }
            }
            return (bool)$saleable;
        }
        else {
            return false;
        }
    }

    /**
     * Retrieve default Selection object
     *
     * @return Mage_Bundle_Model_Selection
     */
    public function getDefaultSelection()
    {
        if (!$this->_defaultSelection && $this->getSelections()) {
            foreach ($this->getSelections() as $selection) {
                if ($selection->getIsDefault()) {
                    $this->_defaultSelection = $selection;
                    break;
                }
            }
        }
        return $this->_defaultSelection;
        /**
         *         if (!$this->_defaultSelection && $this->getSelections()) {
            $_selections = array();
            foreach ($this->getSelections() as $selection) {
                if ($selection->getIsDefault()) {
                    $_selections[] = $selection;
                }
            }
            if (!empty($_selections)) {
                $this->_defaultSelection = $_selections;
            } else {
                return null;
            }
        }
        return $this->_defaultSelection;
         */
    }

    /**
     * Check is multi Option selection
     *
     * @return bool
     */
    public function isMultiSelection()
    {
        if ($this->getType() == 'checkbox' || $this->getType() == 'multi') {
            return true;
        } else {
            return false;
        }
    }

    /**
     * Retrieve options searchable data
     *
     * @param int $productId
     * @param int $storeId
     * @return array
     */
    public function getSearchableData($productId, $storeId)
    {
        return $this->_getResource()
            ->getSearchableData($productId, $storeId);
    }
}

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