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<?php
/**
* Isis field iterator. Iterates over all field main values for
* each result row.
*
* @todo
* Support for 'join_subfields'
*/
class IsisMainFieldIterator implements Iterator
{
private $class;
private $field;
private $valueset;
private $row = 0;
private $rows = 0;
/**
* Constructor.
*
* @param $class
* Instance of IsisConnector or child class.
*
* @param $field
* Field to iterate over.
*/
public function __construct($class, $field) {
$this->rows = $class->getRows($field);
$this->valueset = $class->getValues($field);
$this->class = $class;
$this->field = $field;
}
/**
* Rewind the Iterator to the first element.
*/
function rewind() {
$this->row = 0;
$this->value = 0;
}
/**
* Return the key of the current element.
*/
function key() {
return $this->row;
}
/**
* Return the current element.
*/
function current() {
$field = $this->class->getMainFieldName($this->field);
return $this->valueset[$this->row][$field];
}
/**
* Move forward to next element.
*/
function next() {
do {
++$this->row;
}
while ($this->current_null() && $this->has_more_rows());
}
/**
* Check if there are more rows.
*/
function has_more_rows() {
return $this->row <= $this->rows;
}
/**
* Check if the current value is null.
*/
function current_null() {
return $this->current() == NULL;
}
/**
* Check if there is a current element after calls to rewind() or next().
*/
function valid() {
return $this->has_more_rows() && !$this->current_null();
}
}
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