1: <?php
  2: /**
  3:  * Magento
  4:  *
  5:  * NOTICE OF LICENSE
  6:  *
  7:  * This source file is subject to the Open Software License (OSL 3.0)
  8:  * that is bundled with this package in the file LICENSE.txt.
  9:  * It is also available through the world-wide-web at this URL:
 10:  * http://opensource.org/licenses/osl-3.0.php
 11:  * If you did not receive a copy of the license and are unable to
 12:  * obtain it through the world-wide-web, please send an email
 13:  * to license@magentocommerce.com so we can send you a copy immediately.
 14:  *
 15:  * DISCLAIMER
 16:  *
 17:  * Do not edit or add to this file if you wish to upgrade Magento to newer
 18:  * versions in the future. If you wish to customize Magento for your
 19:  * needs please refer to http://www.magentocommerce.com for more information.
 20:  *
 21:  * @category    Mage
 22:  * @package     Mage_Catalog
 23:  * @copyright   Copyright (c) 2012 Magento Inc. (http://www.magentocommerce.com)
 24:  * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 25:  */
 26: 
 27: /**
 28:  * Layer attribute filter
 29:  *
 30:  * @category   Mage
 31:  * @package    Mage_Catalog
 32:  * @author     Magento Core Team <core@magentocommerce.com>
 33:  */
 34: class Mage_Catalog_Model_Layer_Filter_Attribute extends Mage_Catalog_Model_Layer_Filter_Abstract
 35: {
 36:     const OPTIONS_ONLY_WITH_RESULTS = 1;
 37: 
 38:     /**
 39:      * Resource instance
 40:      *
 41:      * @var Mage_Catalog_Model_Resource_Eav_Mysql4_Layer_Filter_Attribute
 42:      */
 43:     protected $_resource;
 44: 
 45:     /**
 46:      * Construct attribute filter
 47:      *
 48:      */
 49:     public function __construct()
 50:     {
 51:         parent::__construct();
 52:         $this->_requestVar = 'attribute';
 53:     }
 54: 
 55:     /**
 56:      * Retrieve resource instance
 57:      *
 58:      * @return Mage_Catalog_Model_Resource_Eav_Mysql4_Layer_Filter_Attribute
 59:      */
 60:     protected function _getResource()
 61:     {
 62:         if (is_null($this->_resource)) {
 63:             $this->_resource = Mage::getResourceModel('catalog/layer_filter_attribute');
 64:         }
 65:         return $this->_resource;
 66:     }
 67: 
 68:     /**
 69:      * Get option text from frontend model by option id
 70:      *
 71:      * @param   int $optionId
 72:      * @return  string|bool
 73:      */
 74:     protected function _getOptionText($optionId)
 75:     {
 76:         return $this->getAttributeModel()->getFrontend()->getOption($optionId);
 77:     }
 78: 
 79:     /**
 80:      * Apply attribute option filter to product collection
 81:      *
 82:      * @param   Zend_Controller_Request_Abstract $request
 83:      * @param   Varien_Object $filterBlock
 84:      * @return  Mage_Catalog_Model_Layer_Filter_Attribute
 85:      */
 86:     public function apply(Zend_Controller_Request_Abstract $request, $filterBlock)
 87:     {
 88:         $filter = $request->getParam($this->_requestVar);
 89:         if (is_array($filter)) {
 90:             return $this;
 91:         }
 92:         $text = $this->_getOptionText($filter);
 93:         if ($filter && strlen($text)) {
 94:             $this->_getResource()->applyFilterToCollection($this, $filter);
 95:             $this->getLayer()->getState()->addFilter($this->_createItem($text, $filter));
 96:             $this->_items = array();
 97:         }
 98:         return $this;
 99:     }
100: 
101:     /**
102:      * Check whether specified attribute can be used in LN
103:      *
104:      * @param Mage_Catalog_Model_Resource_Eav_Attribute $attribute
105:      * @return bool
106:      */
107:     protected function _getIsFilterableAttribute($attribute)
108:     {
109:         return $attribute->getIsFilterable();
110:     }
111: 
112:     /**
113:      * Get data array for building attribute filter items
114:      *
115:      * @return array
116:      */
117:     protected function _getItemsData()
118:     {
119:         $attribute = $this->getAttributeModel();
120:         $this->_requestVar = $attribute->getAttributeCode();
121: 
122:         $key = $this->getLayer()->getStateKey().'_'.$this->_requestVar;
123:         $data = $this->getLayer()->getAggregator()->getCacheData($key);
124: 
125:         if ($data === null) {
126:             $options = $attribute->getFrontend()->getSelectOptions();
127:             $optionsCount = $this->_getResource()->getCount($this);
128:             $data = array();
129:             foreach ($options as $option) {
130:                 if (is_array($option['value'])) {
131:                     continue;
132:                 }
133:                 if (Mage::helper('core/string')->strlen($option['value'])) {
134:                     // Check filter type
135:                     if ($this->_getIsFilterableAttribute($attribute) == self::OPTIONS_ONLY_WITH_RESULTS) {
136:                         if (!empty($optionsCount[$option['value']])) {
137:                             $data[] = array(
138:                                 'label' => $option['label'],
139:                                 'value' => $option['value'],
140:                                 'count' => $optionsCount[$option['value']],
141:                             );
142:                         }
143:                     }
144:                     else {
145:                         $data[] = array(
146:                             'label' => $option['label'],
147:                             'value' => $option['value'],
148:                             'count' => isset($optionsCount[$option['value']]) ? $optionsCount[$option['value']] : 0,
149:                         );
150:                     }
151:                 }
152:             }
153: 
154:             $tags = array(
155:                 Mage_Eav_Model_Entity_Attribute::CACHE_TAG.':'.$attribute->getId()
156:             );
157: 
158:             $tags = $this->getLayer()->getStateTags($tags);
159:             $this->getLayer()->getAggregator()->saveCacheData($data, $key, $tags);
160:         }
161:         return $data;
162:     }
163: }
164: