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Diffstat (limited to 'framework/Collections/TPagedMapIterator.php')
| -rw-r--r-- | framework/Collections/TPagedMapIterator.php | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/framework/Collections/TPagedMapIterator.php b/framework/Collections/TPagedMapIterator.php new file mode 100644 index 00000000..c5a078c1 --- /dev/null +++ b/framework/Collections/TPagedMapIterator.php @@ -0,0 +1,99 @@ +<?php +/** + * TPagedDataSource, TPagedListIterator, TPagedMapIterator classes + * + * @author Qiang Xue <qiang.xue@gmail.com> + * @link http://www.pradosoft.com/ + * @copyright Copyright © 2005-2014 PradoSoft + * @license http://www.pradosoft.com/license/ + * @package System.Collections + */ + +/** + * TPagedMapIterator class + * + * TPagedMapIterator implements Iterator interface. + * + * TPagedMapIterator is used by {@link TPagedDataSource}. It allows TPagedDataSource + * to return a new iterator for traversing the items in a {@link TMap} object. + * + * @author Qiang Xue <qiang.xue@gmail.com> + * @package System.Collections + * @since 3.0 + */ +class TPagedMapIterator implements Iterator +{ + private $_map; + private $_startIndex; + private $_count; + private $_index; + private $_iterator; + + /** + * Constructor. + * @param array the data to be iterated through + */ + public function __construct(TMap $map,$startIndex,$count) + { + $this->_map=$map; + $this->_index=0; + $this->_startIndex=$startIndex; + if($startIndex+$count>$map->getCount()) + $this->_count=$map->getCount()-$startIndex; + else + $this->_count=$count; + $this->_iterator=$map->getIterator(); + } + + /** + * Rewinds internal array pointer. + * This method is required by the interface Iterator. + */ + public function rewind() + { + $this->_iterator->rewind(); + for($i=0;$i<$this->_startIndex;++$i) + $this->_iterator->next(); + $this->_index=0; + } + + /** + * Returns the key of the current array item. + * This method is required by the interface Iterator. + * @return integer the key of the current array item + */ + public function key() + { + return $this->_iterator->key(); + } + + /** + * Returns the current array item. + * This method is required by the interface Iterator. + * @return mixed the current array item + */ + public function current() + { + return $this->_iterator->current(); + } + + /** + * Moves the internal pointer to the next array item. + * This method is required by the interface Iterator. + */ + public function next() + { + $this->_index++; + $this->_iterator->next(); + } + + /** + * Returns whether there is an item at current position. + * This method is required by the interface Iterator. + * @return boolean + */ + public function valid() + { + return $this->_index<$this->_count; + } +}
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