182 lines
3.6 KiB
PHP
182 lines
3.6 KiB
PHP
<?php
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/**
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* @copyright 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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*/
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abstract class ZendDbResultIterator implements ArrayAccess,SeekableIterator,Countable
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{
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protected $zend_db;
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protected $select;
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protected $result = array();
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protected $paginator = null;
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protected $itemsPerPage = null;
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protected $currentPage = 1;
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private $valid = false;
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private $cacheEnabled = true;
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private $cache = array();
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private $key;
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abstract public function find($fields=null,$order='',$limit=null,$groupBy=null);
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abstract protected function loadResult($key);
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/**
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* Creates an empty collection
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*
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* Setting itemsPerPage turns on pagination mode
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* In pagination mode, this will only load the results for one page
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*/
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public function __construct($itemsPerPage=null,$currentPage=null)
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{
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$this->zend_db = Database::getConnection();
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$this->select = new Zend_Db_Select($this->zend_db);
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if ($itemsPerPage) {
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$this->itemsPerPage = (integer)$itemsPerPage;
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if ($currentPage && $currentPage > 1) {
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$this->currentPage = $currentPage;
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}
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}
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}
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/**
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* Runs the query and stores the results
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*
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* In pagination mode, this will only load the results for one page
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*/
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protected function populateList()
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{
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$this->result = array();
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if (!$this->itemsPerPage) {
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$this->result = $this->zend_db->fetchAll($this->select);
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}
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else {
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// Only load the results for one page
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$this->paginator = new Zend_Paginator(new Zend_Paginator_Adapter_DbSelect($this->select));
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$this->paginator->setItemCountPerPage($this->itemsPerPage);
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$this->paginator->setCurrentPageNumber($this->currentPage);
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foreach ($this->paginator as $row) {
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$this->result[] = $row;
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}
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}
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}
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/**
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* @return string
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*/
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public function getSQL()
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{
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return $this->select->__toString();
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}
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/**
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* @return Zend_Paginator
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*/
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public function getPaginator()
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{
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return $this->paginator;
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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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return array_key_exists($offset,$this->result);
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}
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/**
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* Unimplemented stub requried for interface compliance
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* @ignore
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*/
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public function offsetSet($offset,$value) { } // Read-only for now
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/**
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* Unimplemented stub requried for interface compliance
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* @ignore
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*/
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public function offsetUnset($offset) { } // Read-only for now
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/**
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* @param int $offset
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* @return mixed
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*/
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public function offsetGet($offset)
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{
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if ($this->offsetExists($offset)) {
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return $this->loadResult($offset);
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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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// SPLIterator Section
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/**
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* Reset the pionter to the first element
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*/
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public function rewind() {
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$this->key = 0;
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}
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/**
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* Advance to the next element
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*/
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public function next() {
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$this->key++;
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}
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/**
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* Return the index of the current element
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* @return int
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*/
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public function key() {
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return $this->key;
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}
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/**
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* @return boolean
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*/
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public function valid() {
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return array_key_exists($this->key,$this->result);
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}
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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 $this->loadResult($this->key);
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}
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/**
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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($this->result[$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 $this;
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}
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// Countable Section
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/**
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* @return int
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*/
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public function count()
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{
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return count($this->result);
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}
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}
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