PhutilProxyIterator.php
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	<?php

	abstract class PhutilProxyIterator
	extends Phobject
	implements Iterator {

	private $iterator;
	private $key;
	private $value;
	private $valid;

	public function __construct(Iterator $iterator) {
	$this->iterator = $iterator;
	}

	protected function didReadValue($value) {
	return $value;
	}


	/* -( Iterator Implementation )-------------------------------------------- */


	final public function rewind() {
	$this->iterator->rewind();
	$this->update();
	}

	final public function valid() {
	return $this->valid;
	}

	final public function current() {
	return $this->value;
	}

	final public function key() {
	return $this->key;
	}

	final public function next() {
	$this->iterator->next();
	$this->update();
	}

	private function update() {
	$this->key = $this->iterator->key();
	$this->valid = $this->iterator->valid();

	if ($this->valid) {
	$value = $this->iterator->current();
	$value = $this->didReadValue($value);
	$this->value = $value;
	}
	}

	}