PhageAction.php
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	<?php

	abstract class PhageAction
	extends Phobject {

	private $actions = array();

	abstract public function isContainerAction();

	protected function willAddAction(PhageAction $action) {
	throw new PhutilMethodNotImplementedException();
	}

	final protected function getActions() {
	$this->requireContainerAction();

	return $this->actions;
	}

	final public function addAction(PhageAction $action) {
	$this->requireContainerAction();

	$this->willAddAction($action);

	$this->actions[] = $action;
	}

	protected function getAllWaitingChannels() {
	if (!$this->isContainerAction()) {
	throw new PhutilMethodNotImplementedException();
	}

	$channels = array();
	foreach ($this->getActions() as $action) {
	foreach ($action->getAllWaitingChannels() as $channel) {
	$channels[] = $channel;
	}
	}

	return $channels;
	}

	private function requireContainerAction() {
	if (!$this->isContainerAction()) {
	throw new Exception(pht('This is not a container action.'));
	}
	}

	}