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-rw-r--r--classes/IsisFieldIterator.php65
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+<?php
+
+/**
+ * Isis field iterator. Iterates over all field values for
+ * each result row.
+ */
+class IsisFieldIterator implements Iterator
+{
+ 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);
+ }
+
+ /**
+ * 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() {
+ return $this->valueset[$this->row]['field'];
+ }
+
+ /**
+ * Move forward to next element.
+ */
+ function next() {
+ do {
+ ++$this->row;
+ }
+ while ($this->current() == NULL && $this->valid());
+ }
+
+ /**
+ * Check if there is a current element after calls to rewind() or next().
+ */
+ function valid() {
+ return $this->row <= $this->rows;
+ }
+}