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<?php
define('CIT_CALL_TOSTRING', 1);
define('CIT_CATCH_GET_CHILD', 2);
class CachingIterator
{
protected $it;
protected $current;
protected $key;
protected $valid;
protected $strValue;
function __construct(Iterator $it, $flags = CIT_CALL_TOSTRING)
{
$this->it = $it;
$this->flags = $flags & (CIT_CALL_TOSTRING|CIT_CATCH_GET_CHILD);
$this->next();
}
function rewind()
{
$this->it->rewind();
$this->next();
}
function next()
{
if ($this->valid = $this->it->valid()) {
$this->current = $this->it->current();
$this->key = $this->it->key();
if ($this->flags & CIT_CALL_TOSTRING) {
if (is_object($this->current)) {
$this->strValue = $this->current->__toString();
} else {
$this->strValue = (string)$this->current;
}
}
} else {
$this->current = NULL;
$this->key = NULL;
$this->strValue = NULL;
}
$this->it->next();
}
function valid()
{
return $this->valid;
}
function hasNext()
{
return $this->it->valid();
}
function current()
{
return $this->current;
}
function key()
{
return $this->key;
}
function __call($func, $params)
{
return call_user_func_array(array($this->it, $func), $params);
}
function __toString()
{
if (!$this->flags & CIT_CALL_TOSTRING) {
throw new exception('CachingIterator does not fetch string value (see CachingIterator::__construct)');
}
return $this->strValue;
}
}
?>
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