appenditerator.inc

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<?php

class AppendIterator implements OuterIterator
{
    private $iterators;

    function __construct()
    {
        $this->iterators = new ArrayIterator();
    }

    function append(Iterator $it)
    {
        $this->iterators->append($it);
    }

    function getInnerIterator()
    {
        return $this->iterators->current();
    }

    function rewind()
    {
        $this->iterators->rewind();
        if ($this->iterators->valid())
        {
            $this->getInnerIterator()->rewind();
        }
    }

    function valid()
    {
        return $this->iterators->valid() && $this->getInnerIterator()->valid();
    }

    function current()
    {
        /* Using $this->valid() would be exactly the same; it would omit
         * the access to a non valid element in the inner iterator. Since
         * the user didn't respect the valid() return value false this
         * must be intended hence we go on. */
        return $this->iterators->valid() ? $this->getInnerIterator()->current() : NULL;
    }

    function key()
    {
        return $this->iterators->valid() ? $this->getInnerIterator()->key() : NULL;
    }

    function next()
    {
        if (!$this->iterators->valid())
        {
            return; /* done all */
        }
        $this->getInnerIterator()->next();
        if ($this->getInnerIterator()->valid())
        {
            return; /* found valid element in current inner iterator */
        }
        $this->iterators->next();
        while ($this->iterators->valid())
        {
            $this->getInnerIterator()->rewind();
            if ($this->getInnerIterator()->valid())
            {
                return; /* found element as first elemet in another iterator */
            }
            $this->iterators->next();
        }
    }

    function __call($func, $params)
    {
        return call_user_func_array(array($this->getInnerIterator(), $func), $params);
    }
}

?>