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<?php
/**
* @package Joomla.Administrator
* @subpackage com_finder
*
* @copyright Copyright (C) 2005 - 2016 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('_JEXEC') or die;
JLoader::register('FinderIndexerHelper', __DIR__ . '/helper.php');
JLoader::register('FinderIndexerParser', __DIR__ . '/parser.php');
JLoader::register('FinderIndexerStemmer', __DIR__ . '/stemmer.php');
JLoader::register('FinderIndexerTaxonomy', __DIR__ . '/taxonomy.php');
JLoader::register('FinderIndexerToken', __DIR__ . '/token.php');
jimport('joomla.filesystem.file');
/**
* Main indexer class for the Finder indexer package.
*
* The indexer class provides the core functionality of the Finder
* search engine. It is responsible for adding and updating the
* content links table; extracting and scoring tokens; and maintaining
* all referential information for the content.
*
* Note: All exceptions thrown from within this class should be caught
* by the controller.
*
* @since 2.5
*/
abstract class FinderIndexer
{
/**
* The title context identifier.
*
* @var integer
* @since 2.5
*/
const TITLE_CONTEXT = 1;
/**
* The text context identifier.
*
* @var integer
* @since 2.5
*/
const TEXT_CONTEXT = 2;
/**
* The meta context identifier.
*
* @var integer
* @since 2.5
*/
const META_CONTEXT = 3;
/**
* The path context identifier.
*
* @var integer
* @since 2.5
*/
const PATH_CONTEXT = 4;
/**
* The misc context identifier.
*
* @var integer
* @since 2.5
*/
const MISC_CONTEXT = 5;
/**
* The indexer state object.
*
* @var JObject
* @since 2.5
*/
public static $state;
/**
* The indexer profiler object.
*
* @var JProfiler
* @since 2.5
*/
public static $profiler;
/**
* Returns a reference to the FinderIndexer object.
*
* @return FinderIndexer instance based on the database driver
*
* @since 3.0
* @throws RuntimeException if driver class for indexer not present.
*/
public static function getInstance()
{
// Setup the adapter for the indexer.
$format = JFactory::getDbo()->name;
if ($format == 'mysqli' || $format == 'pdomysql')
{
$format = 'mysql';
}
elseif ($format == 'sqlazure')
{
$format = 'sqlsrv';
}
$path = __DIR__ . '/driver/' . $format . '.php';
$class = 'FinderIndexerDriver' . ucfirst($format);
// Check if a parser exists for the format.
if (file_exists($path))
{
// Instantiate the parser.
include_once $path;
return new $class;
}
// Throw invalid format exception.
throw new RuntimeException(JText::sprintf('COM_FINDER_INDEXER_INVALID_DRIVER', $format));
}
/**
* Method to get the indexer state.
*
* @return object The indexer state object.
*
* @since 2.5
*/
public static function getState()
{
// First, try to load from the internal state.
if (!empty(static::$state))
{
return static::$state;
}
// If we couldn't load from the internal state, try the session.
$session = JFactory::getSession();
$data = $session->get('_finder.state', null);
// If the state is empty, load the values for the first time.
if (empty($data))
{
$data = new JObject;
// Load the default configuration options.
$data->options = JComponentHelper::getParams('com_finder');
// Setup the weight lookup information.
$data->weights = array(
self::TITLE_CONTEXT => round($data->options->get('title_multiplier', 1.7), 2),
self::TEXT_CONTEXT => round($data->options->get('text_multiplier', 0.7), 2),
self::META_CONTEXT => round($data->options->get('meta_multiplier', 1.2), 2),
self::PATH_CONTEXT => round($data->options->get('path_multiplier', 2.0), 2),
self::MISC_CONTEXT => round($data->options->get('misc_multiplier', 0.3), 2)
);
// Set the current time as the start time.
$data->startTime = JFactory::getDate()->toSql();
// Set the remaining default values.
$data->batchSize = (int) $data->options->get('batch_size', 50);
$data->batchOffset = 0;
$data->totalItems = 0;
$data->pluginState = array();
}
// Setup the profiler if debugging is enabled.
if (JFactory::getApplication()->get('debug'))
{
static::$profiler = JProfiler::getInstance('FinderIndexer');
}
// Setup the stemmer.
if ($data->options->get('stem', 1) && $data->options->get('stemmer', 'porter_en'))
{
FinderIndexerHelper::$stemmer = FinderIndexerStemmer::getInstance($data->options->get('stemmer', 'porter_en'));
}
// Set the state.
static::$state = $data;
return static::$state;
}
/**
* Method to set the indexer state.
*
* @param object $data A new indexer state object.
*
* @return boolean True on success, false on failure.
*
* @since 2.5
*/
public static function setState($data)
{
// Check the state object.
if (empty($data) || !$data instanceof JObject)
{
return false;
}
// Set the new internal state.
static::$state = $data;
// Set the new session state.
JFactory::getSession()->set('_finder.state', $data);
return true;
}
/**
* Method to reset the indexer state.
*
* @return void
*
* @since 2.5
*/
public static function resetState()
{
// Reset the internal state to null.
self::$state = null;
// Reset the session state to null.
JFactory::getSession()->set('_finder.state', null);
}
/**
* Method to index a content item.
*
* @param FinderIndexerResult $item The content item to index.
* @param string $format The format of the content. [optional]
*
* @return integer The ID of the record in the links table.
*
* @since 2.5
* @throws Exception on database error.
*/
abstract public function index($item, $format = 'html');
/**
* Method to remove a link from the index.
*
* @param integer $linkId The id of the link.
*
* @return boolean True on success.
*
* @since 2.5
* @throws Exception on database error.
*/
abstract public function remove($linkId);
/**
* Method to optimize the index. We use this method to remove unused terms
* and any other optimizations that might be necessary.
*
* @return boolean True on success.
*
* @since 2.5
* @throws Exception on database error.
*/
abstract public function optimize();
/**
* Method to get a content item's signature.
*
* @param object $item The content item to index.
*
* @return string The content item's signature.
*
* @since 2.5
*/
protected static function getSignature($item)
{
// Get the indexer state.
$state = static::getState();
// Get the relevant configuration variables.
$config = array(
$state->weights,
$state->options->get('stem', 1),
$state->options->get('stemmer', 'porter_en')
);
return md5(serialize(array($item, $config)));
}
/**
* Method to parse input, tokenize it, and then add it to the database.
*
* @param mixed $input String or resource to use as input. A resource input will automatically be chunked to conserve
* memory. Strings will be chunked if longer than 2K in size.
* @param integer $context The context of the input. See context constants.
* @param string $lang The language of the input.
* @param string $format The format of the input.
*
* @return integer The number of tokens extracted from the input.
*
* @since 2.5
*/
protected function tokenizeToDb($input, $context, $lang, $format)
{
$count = 0;
$buffer = null;
if (!empty($input))
{
// If the input is a resource, batch the process out.
if (is_resource($input))
{
// Batch the process out to avoid memory limits.
while (!feof($input))
{
// Read into the buffer.
$buffer .= fread($input, 2048);
/*
* If we haven't reached the end of the file, seek to the last
* space character and drop whatever is after that to make sure
* we didn't truncate a term while reading the input.
*/
if (!feof($input))
{
// Find the last space character.
$ls = strrpos($buffer, ' ');
// Adjust string based on the last space character.
if ($ls)
{
// Truncate the string to the last space character.
$string = substr($buffer, 0, $ls);
// Adjust the buffer based on the last space for the next iteration and trim.
$buffer = JString::trim(substr($buffer, $ls));
}
// No space character was found.
else
{
$string = $buffer;
}
}
// We've reached the end of the file, so parse whatever remains.
else
{
$string = $buffer;
}
// Parse the input.
$string = FinderIndexerHelper::parse($string, $format);
// Check the input.
if (empty($string))
{
continue;
}
// Tokenize the input.
$tokens = FinderIndexerHelper::tokenize($string, $lang);
// Add the tokens to the database.
$count += $this->addTokensToDb($tokens, $context);
// Check if we're approaching the memory limit of the token table.
if ($count > static::$state->options->get('memory_table_limit', 30000))
{
$this->toggleTables(false);
}
unset($string);
unset($tokens);
}
}
// If the input is greater than 2K in size, it is more efficient to
// batch out the operation into smaller chunks of work.
elseif (strlen($input) > 2048)
{
$start = 0;
$end = strlen($input);
$chunk = 2048;
/*
* As it turns out, the complex regular expressions we use for
* sanitizing input are not very efficient when given large
* strings. It is much faster to process lots of short strings.
*/
while ($start < $end)
{
// Setup the string.
$string = substr($input, $start, $chunk);
// Find the last space character if we aren't at the end.
$ls = (($start + $chunk) < $end ? strrpos($string, ' ') : false);
// Truncate to the last space character.
if ($ls !== false)
{
$string = substr($string, 0, $ls);
}
// Adjust the start position for the next iteration.
$start += ($ls !== false ? ($ls + 1 - $chunk) + $chunk : $chunk);
// Parse the input.
$string = FinderIndexerHelper::parse($string, $format);
// Check the input.
if (empty($string))
{
continue;
}
// Tokenize the input.
$tokens = FinderIndexerHelper::tokenize($string, $lang);
// Add the tokens to the database.
$count += $this->addTokensToDb($tokens, $context);
// Check if we're approaching the memory limit of the token table.
if ($count > static::$state->options->get('memory_table_limit', 30000))
{
$this->toggleTables(false);
}
}
}
else
{
// Parse the input.
$input = FinderIndexerHelper::parse($input, $format);
// Check the input.
if (empty($input))
{
return $count;
}
// Tokenize the input.
$tokens = FinderIndexerHelper::tokenize($input, $lang);
// Add the tokens to the database.
$count = $this->addTokensToDb($tokens, $context);
}
}
return $count;
}
/**
* Method to add a set of tokens to the database.
*
* @param mixed $tokens An array or single FinderIndexerToken object.
* @param mixed $context The context of the tokens. See context constants. [optional]
*
* @return integer The number of tokens inserted into the database.
*
* @since 2.5
* @throws Exception on database error.
*/
abstract protected function addTokensToDb($tokens, $context = '');
/**
* Method to switch the token tables from Memory tables to MyISAM tables
* when they are close to running out of memory.
*
* @param boolean $memory Flag to control how they should be toggled.
*
* @return boolean True on success.
*
* @since 2.5
* @throws Exception on database error.
*/
abstract protected function toggleTables($memory);
}
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