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PhabricatorChartInterval.php
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			<?php

			final class PhabricatorChartInterval
			extends Phobject {

			private $min;
			private $max;

			public function __construct($min, $max) {
			$this->min = $min;
			$this->max = $max;
			}

			public static function newFromIntervalList(array $intervals) {
			$min = null;
			$max = null;
			foreach ($intervals as $interval) {
			if ($interval === null) {
			continue;
			}

			$interval_min = $interval->getMin();
			if ($interval_min !== null) {
			if ($min === null) {
			$min = $interval_min;
			} else {
			$min = min($min, $interval_min);
			}
			}

			$interval_max = $interval->getMax();
			if ($interval_max !== null) {
			if ($max === null) {
			$max = $interval_max;
			} else {
			$max = max($max, $interval_max);
			}
			}
			}

			return new self($min, $max);
			}

			public function setMin($min) {
			$this->min = $min;
			return $this;
			}

			public function getMin() {
			return $this->min;
			}

			public function setMax($max) {
			$this->max = $max;
			return $this;
			}

			public function getMax() {
			return $this->max;
			}

			}