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<?php
/**
* Isis subfield iterator. Iterates over all subfields for
* each result row.
*/
class IsisSubfieldIterator implements Iterator
{
private $keys;
private $fieldset;
private $row = 0;
private $rows = 0;
private $subfield = 0;
private $subfields = 0;
/**
* Constructor.
*
* @param $class
* Instance of IsisConnector or child class.
*
* @param $field
* Field to iterate over.
*/
public function __construct($class, $field) {
$this->class = $class;
$this->field = $field;
$this->rows = $class->getRows($field);
$this->fieldset = $class->getSubfieldList($field);
$this->keys = array_keys($this->fieldset);
$this->subfields = count($this->keys);
}
/**
* Rewind the Iterator to the first element.
*/
function rewind() {
$this->row = 0;
$this->subfield = 0;
}
/**
* Return the key of the current element.
*/
function key() {
return $this->row;
}
/**
* Return the current element.
*/
function current() {
return $this->fieldset[$this->keys[$this->subfield]];
}
/**
* Move forward to next element.
*/
function next() {
if ($this->subfield >= $this->subfields) {
$this->subfield = 0;
++$this->row;
}
else {
++$this->subfield;
}
}
/**
* Check if there is a current element after calls to rewind() or next().
*/
function valid() {
return $this->row <= $this->rows;
}
}
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