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PhutilCalendarContainerNode.php
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			<?php

			abstract class PhutilCalendarContainerNode
			extends PhutilCalendarNode {

			private $children = array();

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

			final public function getChildrenOfType($type) {
			$result = array();

			foreach ($this->getChildren() as $key => $child) {
			if ($child->getNodeType() != $type) {
			continue;
			}
			$result[$key] = $child;
			}

			return $result;
			}

			final public function appendChild(PhutilCalendarNode $node) {
			$this->children[] = $node;
			return $this;
			}

			}