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<?php
class LimitIterator implements Iterator
{
protected $it;
protected $offset;
protected $count;
protected $index;
// negative offset is respected
// count === NULL means all
function __construct(Iterator $it, $offset = 0, $count = NULL)
{
$this->it = $it;
$this->offset = $offset;
$this->count = $count;
$this->index = 0;
}
function rewind()
{
$this->it->rewind();
$this->index = 0;
if ($this->it instanceof SeekableIterator) {
$this->index = $this->it->seek($this->offset);
} else {
while($this->index < $this->offset && $this->it->hasMore()) {
$this->next();
}
}
}
function hasMore() {
return (is_null($this->count) || $this->index < $this->offset + $this->count)
&& $this->it->hasMore();
}
function key() {
return $this->it->key();
}
function current() {
return $this->it->current();
}
function next() {
$this->it->next();
$this->index++;
}
}
?>
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