PhabricatorPDFIterator.php
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PhabricatorPDFIterator.php
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	<?php

	final class PhabricatorPDFIterator
	extends Phobject
	implements Iterator {

	private $generator;
	private $hasRewound;

	private $fragments;
	private $fragmentKey;
	private $fragmentBytes;
	private $fragmentOffsets = array();
	private $byteLength;

	public function setGenerator(PhabricatorPDFGenerator $generator) {
	if ($this->generator) {
	throw new Exception(
	pht(
	'This iterator already has a generator. You can not modify the '.
	'generator for a given iterator.'));
	}

	$this->generator = $generator;

	return $this;
	}

	public function getGenerator() {
	if (!$this->generator) {
	throw new Exception(
	pht(
	'This PDF iterator has no associated PDF generator.'));
	}

	return $this->generator;
	}

	public function getFragmentOffsets() {
	return $this->fragmentOffsets;
	}

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

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

	public function next() {
	$this->fragmentKey++;

	if (!$this->valid()) {
	return;
	}

	$fragment = $this->fragments[$this->fragmentKey];

	$this->fragmentOffsets[] = id(new PhabricatorPDFFragmentOffset())
	->setFragment($fragment)
	->setOffset($this->byteLength);

	$bytes = $fragment->getAsBytes();

	$this->fragmentBytes = $bytes;
	$this->byteLength += strlen($bytes);
	}

	public function rewind() {
	if ($this->hasRewound) {
	throw new Exception(
	pht(
	'PDF iterators may not be rewound. Create a new iterator to emit '.
	'another PDF.'));
	}

	$generator = $this->getGenerator();
	$objects = $generator->getObjects();

	$this->fragments = array();
	$this->fragments[] = new PhabricatorPDFHeadFragment();

	foreach ($objects as $object) {
	$this->fragments[] = $object;
	}

	$this->fragments[] = id(new PhabricatorPDFTailFragment())
	->setIterator($this);

	$this->hasRewound = true;

	$this->fragmentKey = -1;
	$this->byteLength = 0;

	$this->next();
	}

	public function valid() {
	return isset($this->fragments[$this->fragmentKey]);
	}

	}

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