PhabricatorConfigStackSource.php
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	<?php

	/**
	* Configuration source which reads from a stack of other configuration
	* sources.
	*
	* This source is writable if any source in the stack is writable. Writes happen
	* to the first writable source only.
	*/
	final class PhabricatorConfigStackSource
	extends PhabricatorConfigSource {

	private $stack = array();

	public function pushSource(PhabricatorConfigSource $source) {
	array_unshift($this->stack, $source);
	return $this;
	}

	public function popSource() {
	if (empty($this->stack)) {
	throw new Exception("Popping an empty config stack!");
	}
	return array_shift($this->stack);
	}

	public function getStack() {
	return $this->stack;
	}

	public function getKeys(array $keys) {
	$result = array();
	foreach ($this->stack as $source) {
	$result = $result + $source->getKeys($keys);
	}
	return $result;
	}

	public function getAllKeys() {
	$result = array();
	foreach ($this->stack as $source) {
	$result = $result + $source->getAllKeys();
	}
	return $result;
	}

	public function canWrite() {
	foreach ($this->stack as $source) {
	if ($source->canWrite()) {
	return true;
	}
	}
	return false;
	}

	public function setKeys(array $keys) {
	foreach ($this->stack as $source) {
	if ($source->canWrite()) {
	$source->setKeys($keys);
	return;
	}
	}

	// We can't write; this will throw an appropriate exception.
	parent::setKeys($keys);
	}

	public function deleteKeys(array $keys) {
	foreach ($this->stack as $source) {
	if ($source->canWrite()) {
	$source->deleteKeys($keys);
	return;
	}
	}

	// We can't write; this will throw an appropriate exception.
	parent::deleteKeys($keys);
	}

	}