<?php

/**
 * Configuration source which proxies some other configuration source.
 */
abstract class PhabricatorConfigProxySource
  extends PhabricatorConfigSource {

  private $source;

  final protected function getSource() {
    if (!$this->source) {
      throw new Exception("No configuration source set!");
    }
    return $this->source;
  }

  final protected function setSource(PhabricatorConfigSource $source) {
    $this->source = $source;
    return $this;
  }

  public function getAllKeys() {
    return $this->getSource()->getAllKeys();
  }

  public function getKeys(array $keys) {
    return $this->getSource()->getKeys($keys);
  }

  public function canWrite() {
    return $this->getSource->canWrite();
  }

  public function setKeys(array $keys) {
    return $this->getSource->setKeys();
  }

  public function deleteKeys(array $keys) {
    return $this->getSource->deleteKeys();
  }

}