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PhabricatorPDFGenerator.php
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			<?php

			final class PhabricatorPDFGenerator
			extends Phobject {

			private $objects = array();
			private $hasIterator = false;

			private $infoObject;
			private $catalogObject;

			public function addObject(PhabricatorPDFObject $object) {
			if ($this->hasIterator) {
			throw new Exception(
			pht(
			'This generator has already emitted an iterator. You can not '.
			'modify the PDF document after you begin writing it.'));
			}

			$this->objects[] = $object;
			$index = count($this->objects);

			$object->setGenerator($this, $index);

			return $this;
			}

			public function getObjects() {
			return $this->objects;
			}

			public function newIterator() {
			$this->hasIterator = true;
			return id(new PhabricatorPDFIterator())
			->setGenerator($this);
			}

			public function setInfoObject(PhabricatorPDFInfoObject $info_object) {
			$this->addObject($info_object);
			$this->infoObject = $info_object;
			return $this;
			}

			public function getInfoObject() {
			return $this->infoObject;
			}

			public function setCatalogObject(
			PhabricatorPDFCatalogObject $catalog_object) {
			$this->addObject($catalog_object);
			$this->catalogObject = $catalog_object;
			return $this;
			}

			public function getCatalogObject() {
			return $this->catalogObject;
			}

			}