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CelerityResourcesOnDisk.php
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			<?php

			/**
			* Defines the location of static resources on disk.
			*/
			abstract class CelerityResourcesOnDisk extends CelerityPhysicalResources {

			abstract public function getPathToResources();

			private function getPathToResource($name) {
			return $this->getPathToResources().DIRECTORY_SEPARATOR.$name;
			}

			public function getResourceData($name) {
			return Filesystem::readFile($this->getPathToResource($name));
			}

			public function findBinaryResources() {
			return $this->findResourcesWithSuffixes($this->getBinaryFileSuffixes());
			}

			public function findTextResources() {
			return $this->findResourcesWithSuffixes($this->getTextFileSuffixes());
			}

			public function getResourceModifiedTime($name) {
			return (int)filemtime($this->getPathToResource($name));
			}

			protected function getBinaryFileSuffixes() {
			return array(
			'png',
			'jpg',
			'gif',
			'swf',
			'svg',
			'woff',
			'woff2',
			'ttf',
			'eot',
			'mp3',
			'ico',
			);
			}

			protected function getTextFileSuffixes() {
			return array(
			'js',
			'css',
			);
			}

			private function findResourcesWithSuffixes(array $suffixes) {
			$root = $this->getPathToResources();

			$finder = id(new FileFinder($root))
			->withType('f')
			->withFollowSymlinks(true)
			->setGenerateChecksums(true);

			foreach ($suffixes as $suffix) {
			$finder->withSuffix($suffix);
			}

			$raw_files = $finder->find();

			$results = array();
			foreach ($raw_files as $path => $hash) {
			$readable = Filesystem::readablePath($path, $root);
			$results[$readable] = $hash;
			}

			return $results;
			}

			}