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-rw-r--r--classes/iterators/IsisSubfieldIterator.php75
1 files changed, 75 insertions, 0 deletions
diff --git a/classes/iterators/IsisSubfieldIterator.php b/classes/iterators/IsisSubfieldIterator.php
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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;
+ }
+}