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<?php
/** @file recursivedualiterator.inc
* @ingroup Examples
* @brief class RecursiveDualIterator
* @author Marcus Boerger
* @date 2003 - 2006
*
* SPL - Standard PHP Library
*/
/** @ingroup Examples
* @brief Synchronous iteration over two recursive iterators
* @author Marcus Boerger
* @version 1.0
*/
class RecursiveDualIterator extends DualIterator implements RecursiveIterator
{
private $ref;
/** construct iterator from two RecursiveIterator instances
*
* @param lhs Left Hand Side Iterator
* @param rhs Right Hand Side Iterator
* @param flags iteration flags
*/
function __construct(RecursiveIterator $lhs, RecursiveIterator $rhs,
$flags = 0x33 /*DualIterator::DEFAULT_FLAGS*/)
{
parent::__construct($lhs, $rhs, $flags);
}
/** @return bool whether both LHS and RHS have children
*/
function hasChildren(): bool
{
return $this->getLHS()->hasChildren() && $this->getRHS()->hasChildren();
}
/** @return RecursiveDualIterator (late binding) for the two inner
* iterators current children.
*/
function getChildren(): RecursiveDualIterator
{
if (empty($this->ref))
{
$this->ref = new ReflectionClass($this);
}
return $this->ref->newInstance(
$this->getLHS()->getChildren(), $this->getRHS()->getChildren(), $this->getFlags());
}
/** @return bool whether both inner iterators are valid, have same hasChildren()
* state and identical current and key values or both are non valid.
*/
function areIdentical(): bool
{
return $this->getLHS()->hasChildren() === $this->getRHS()->hasChildren()
&& parent::areIdentical();
}
/** @return bool whether both inner iterators are valid, have same hasChildren()
* state and equal current and key values or both are invalid.
*/
function areEqual(): bool
{
return $this->getLHS()->hasChildren() === $this->getRHS()->hasChildren()
&& parent::areEqual();
}
}
?>
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