148 lines
2.6 KiB
PHP
148 lines
2.6 KiB
PHP
<?php
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/**
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* Takes an array and splits it up into pages (an array of arrays)
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*
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* @copyright 2008-2009 City of Bloomington, Indiana
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* @license http://www.gnu.org/copyleft/gpl.html GNU/GPL, see LICENSE.txt
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* @author Cliff Ingham <inghamn@bloomington.in.gov>
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*/
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class Paginator implements ArrayAccess,SeekableIterator,Countable
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{
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private $pageSize;
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private $pages = array();
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private $key = 0;
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/**
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* @param array $list
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* @param int $pageSize
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*/
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public function __construct($list,$pageSize)
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{
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$this->pageSize = $pageSize;
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$totalPageCount = count($list) / $this->pageSize;
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for ($i=0; $i<$totalPageCount; $i++) {
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$this->pages[] = $i * $this->pageSize;
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}
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}
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/**
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* Returns the number of elements per page
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* @return int
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*/
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public function getPageSize()
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{
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return $this->pageSize;
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}
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/**
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* Returns the vary last index number for this paginator
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* @return int
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*/
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public function getLastIndex()
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{
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return count($this->pages)-1;
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}
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// Array Access section
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/**
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* @param int $offset
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* @return boolean
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*/
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public function offsetExists($offset)
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{
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return array_key_exists($offset,$this->pages);
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}
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/**
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* Returns the array of elements for a given page
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* @param int $offset
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* @return array
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*/
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public function offsetGet($offset)
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{
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return $this->pages[$offset];
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}
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/**
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* Unimplemented stub required for SPLIterator interface
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* Once created, paginators are read-only
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*/
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public function offsetSet($offset,$value)
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{
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// Read-only for now
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}
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/**
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* Unimplemented stub required for SPLIterator interface
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* Once created, paginators are read-only
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*/
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public function offsetUnset($offset)
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{
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// Read only for now
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}
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// Iterator Interface stuff
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/**
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* Reset the iterator to the start
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*/
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public function rewind()
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{
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$this->key = 0;
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}
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/**
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* Move the pointer to the next element
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*/
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public function next()
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{
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$this->key++;
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}
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/**
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* @return int
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*/
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public function key()
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{
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return $this->key;
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}
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/**
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* @return boolean
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*/
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public function valid()
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{
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return array_key_exists($this->key,$this->pages);
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}
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/**
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* Return the array of element for the current page
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* @return array
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*/
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public function current()
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{
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return $this->pages[$this->key];
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}
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/**
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* Go to a specific page
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* @param int $index
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*/
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public function seek($index)
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{
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if (isset($this->pages[$index])) {
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$this->key = $index;
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}
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else {
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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 Iterator
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*/
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public function getIterator()
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{
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return $this;
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}
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// Countable interface section
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/**
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* @return int
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*/
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public function count()
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{
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return count($this->pages);
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}
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}
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