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239 lines
6.2 KiB
PHP
239 lines
6.2 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Tag
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* @subpackage ItemList
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: ItemList.php 16209 2009-06-21 19:20:34Z thomas $
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*/
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/**
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* @see Zend_Tag_Taggable
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*/
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require_once 'Zend/Tag/Taggable.php';
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/**
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* @category Zend
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* @package Zend_Tag
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Tag_ItemList implements Countable, SeekableIterator, ArrayAccess
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{
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/**
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* Items in this list
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*
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* @var array
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*/
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protected $_items = array();
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/**
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* Count all items
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*
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* @return integer
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*/
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public function count()
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{
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return count($this->_items);
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}
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/**
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* Spread values in the items relative to their weight
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*
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* @param array $values
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* @throws Zend_Tag_Exception When value list is empty
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* @return void
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*/
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public function spreadWeightValues(array $values)
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{
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// Don't allow an empty value list
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if (count($values) === 0) {
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require_once 'Zend/Tag/Exception.php';
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throw new Zend_Tag_Exception('Value list may not be empty');
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}
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// Re-index the array
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$values = array_values($values);
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// If just a single value is supplied simply assign it to to all tags
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if (count($values) === 1) {
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foreach ($this->_items as $item) {
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$item->setParam('weightValue', $values[0]);
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}
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} else {
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// Calculate min- and max-weight
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$minWeight = null;
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$maxWeight = null;
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foreach ($this->_items as $item) {
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if ($minWeight === null && $maxWeight === null) {
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$minWeight = $item->getWeight();
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$maxWeight = $item->getWeight();
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} else {
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$minWeight = min($minWeight, $item->getWeight());
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$maxWeight = max($maxWeight, $item->getWeight());
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}
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}
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// Calculate the thresholds
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$steps = count($values);
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$delta = ($maxWeight - $minWeight) / ($steps - 1);
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$thresholds = array();
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for ($i = 0; $i < $steps; $i++) {
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$thresholds[$i] = floor(100 * log(($minWeight + $i * $delta) + 2));
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}
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// Then assign the weight values
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foreach ($this->_items as $item) {
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$threshold = floor(100 * log($item->getWeight() + 2));
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for ($i = 0; $i < $steps; $i++) {
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if ($threshold <= $thresholds[$i]) {
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$item->setParam('weightValue', $values[$i]);
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break;
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}
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}
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}
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}
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}
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/**
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* Seek to an absolute positio
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*
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* @param integer $index
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* @throws OutOfBoundsException When the seek position is invalid
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* @return void
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*/
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public function seek($index)
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{
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$this->rewind();
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$position = 0;
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while ($position < $index && $this->valid()) {
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$this->next();
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$position++;
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}
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if (!$this->valid()) {
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throw new OutOfBoundsException('Invalid seek position');
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}
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}
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/**
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* Return the current element
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*
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* @return mixed
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*/
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public function current()
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{
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return current($this->_items);
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}
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/**
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* Move forward to next element
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*
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* @return mixed
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*/
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public function next()
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{
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return next($this->_items);
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}
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/**
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* Return the key of the current element
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*
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* @return mixed
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*/
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public function key()
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{
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return key($this->_items);
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}
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/**
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* Check if there is a current element after calls to rewind() or next()
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*
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* @return boolean
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*/
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public function valid()
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{
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return ($this->current() !== false);
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}
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/**
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* Rewind the Iterator to the first element
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*
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* @return void
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*/
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public function rewind()
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{
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reset($this->_items);
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}
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/**
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* Check if an offset exists
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*
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* @param mixed $offset
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* @return boolean
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*/
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public function offsetExists($offset) {
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return array_key_exists($offset, $this->_items);
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}
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/**
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* Get the value of an offset
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*
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* @param mixed $offset
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* @return Zend_Tag_Taggable
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*/
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public function offsetGet($offset) {
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return $this->_items[$offset];
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}
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/**
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* Append a new item
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*
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* @param mixed $offset
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* @param Zend_Tag_Taggable $item
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* @throws OutOfBoundsException When item does not implement Zend_Tag_Taggable
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* @return void
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*/
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public function offsetSet($offset, $item) {
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// We need to make that check here, as the method signature must be
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// compatible with ArrayAccess::offsetSet()
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if (!($item instanceof Zend_Tag_Taggable)) {
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require_once 'Zend/Tag/Exception.php';
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throw new Zend_Tag_Exception('Item must implement Zend_Tag_Taggable');
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}
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if ($offset === null) {
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$this->_items[] = $item;
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} else {
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$this->_items[$offset] = $item;
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}
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}
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/**
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* Unset an item
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*
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* @param mixed $offset
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* @return void
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*/
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public function offsetUnset($offset) {
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unset($this->_items[$offset]);
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}
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}
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