AST_InstallIndicator.php

<?php
include_once('AST_OptionsManager.php');
class AST_InstallIndicator extends AST_OptionsManager
  {
    const optionInstalled = '_installed';
    const optionVersion = '_version';
    public function isInstalled()
      {
        return $this->getOption(self::optionInstalled) == true;
      }
    protected function markAsInstalled()
      {
        return $this->updateOption(self::optionInstalled, true);
      }
    protected function markAsUnInstalled()
      {
        return $this->deleteOption(self::optionInstalled);
      }
    protected function getVersionSaved()
      {
        return $this->getOption(self::optionVersion);
      }
    protected function setVersionSaved($version)
      {
        return $this->updateOption(self::optionVersion, $version);
      }
    protected function getMainPluginFileName()
      {
        return basename(dirname(__FILE__)) . 'php';
      }
    public function getPluginHeaderValue($key)
      {
        $data  = file_get_contents($this->getPluginDir() . DIRECTORY_SEPARATOR . $this->getMainPluginFileName());
        $match = array();
        preg_match('/' . $key . ':\s*(\S+)/', $data, $match);
        if (count($match) >= 1)
          {
            return $match[1];
          }
        return null;
      }
    protected function getPluginDir()
      {
        return dirname(__FILE__);
      }
    public function getVersion()
      {
        return $this->getPluginHeaderValue('Version');
      }
    public function isInstalledCodeAnUpgrade()
      {
        return $this->isSavedVersionLessThan($this->getVersion());
      }
    public function isSavedVersionLessThan($aVersion)
      {
        return $this->isVersionLessThan($this->getVersionSaved(), $aVersion);
      }
    public function isSavedVersionLessThanEqual($aVersion)
      {
        return $this->isVersionLessThanEqual($this->getVersionSaved(), $aVersion);
      }
    public function isVersionLessThanEqual($version1, $version2)
      {
        return (version_compare($version1, $version2) <= 0);
      }
    public function isVersionLessThan($version1, $version2)
      {
        return (version_compare($version1, $version2) < 0);
      }
    protected function saveInstalledVersion()
      {
        $this->setVersionSaved($this->getVersion());
      }
  }