PhutilKeyValueCacheNamespace.php
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	<?php

	final class PhutilKeyValueCacheNamespace extends PhutilKeyValueCacheProxy {

	private $namespace;

	public function setNamespace($namespace) {
	if (strpos($namespace, ':') !== false) {
	throw new Exception(pht("Namespace can't contain colons."));
	}

	$this->namespace = $namespace.':';

	return $this;
	}

	public function setKeys(array $keys, $ttl = null) {
	return parent::setKeys(array_combine(
	$this->prefixKeys(array_keys($keys)),
	$keys), $ttl);
	}

	public function getKeys(array $keys) {
	$results = parent::getKeys($this->prefixKeys($keys));

	if (!$results) {
	return array();
	}

	return array_combine(
	$this->unprefixKeys(array_keys($results)),
	$results);
	}

	public function deleteKeys(array $keys) {
	return parent::deleteKeys($this->prefixKeys($keys));
	}

	private function prefixKeys(array $keys) {
	if ($this->namespace == null) {
	throw new Exception(pht('Namespace not set.'));
	}

	$prefixed_keys = array();
	foreach ($keys as $key) {
	$prefixed_keys[] = $this->namespace.$key;
	}

	return $prefixed_keys;
	}

	private function unprefixKeys(array $keys) {
	if ($this->namespace == null) {
	throw new Exception(pht('Namespace not set.'));
	}

	$unprefixed_keys = array();
	foreach ($keys as $key) {
	$unprefixed_keys[] = substr($key, strlen($this->namespace));
	}

	return $unprefixed_keys;
	}

	}