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<?php
/**
* Isis field iterator. Iterates over a field for each result row.
*/
class IsisItemIterator implements Iterator
{
private $keys;
private $fieldset;
private $row = 0;
private $rows = 0;
private $item = 0;
private $items = 0;
/**
* Constructor.
*
* @param $class
* Instance of IsisConnector or child class.
*
* @param $field
* Field to iterate over.
*
* @param $main
* Control to which item the main field should be mapped to.
* By default no mapping is made.
*/
public function __construct($class, $field, $main = false) {
// Setup.
$this->class = $class;
$this->field = $field;
$this->rows = $class->getRows($field);
// Handle subfields.
$this->fieldset = $class->getSubfieldList($field);
$this->keys = array_keys($this->fieldset);
$this->items = count($this->keys);
// Sum up main item.
$this->fieldset['main'] = $class->getMainItemName($field);
$this->keys[] = 'main';
$this->items++;
}
/**
* Rewind the Iterator to the first element.
*/
function rewind() {
$this->row = 0;
$this->item = 0;
}
/**
* Return the key of the current element.
*/
function key() {
return $this->row;
}
/**
* Return the current element.
*/
function current() {
return $this->fieldset[$this->keys[$this->item]];
}
/**
* Move forward to next element.
*/
function next() {
if ($this->item >= $this->items - 1) {
$this->item = 0;
++$this->row;
}
else {
++$this->item;
}
}
/**
* Check if there is a current element after calls to rewind() or next().
*/
function valid() {
return $this->row <= $this->rows - 1;
}
}
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