Club Drupal

<?php

/**

 * @file

 * Provides hook documentation for the VotingAPI module.

 */

/**

 * Adds to or changes the calculated vote results for a piece of content.

 *

 * VotingAPI calculates a number of common aggregate functions automatically,

 * including the average vote and total number of votes cast. Results are

 * grouped by 'tag', 'value_type', and then 'function' in the following format:

 *

 *   $results[$tag][$value_type][$aggregate_function] = $value;

 *

 * If no custom tag is being used for votes, the catch-all "vote" tag should be

 * used. In cases where custom tags are used to vote on different aspects of a

 * piece of content, a catch-all "vote" value should still be calculated for

 * use

 * on summary screens, etc.

 *

 * @param $vote_results

 *   An alterable array of aggregate vote results.

 * @param $content_type

 *   A string identifying the type of content being rated. Node, comment,

 *   aggregator item, etc.

 * @param $content_id

 *   The key ID of the content being rated.

 *

 * @see votingapi_recalculate_results()

 */

function hook_votingapi_results_alter(&$vote_results, $content_type, $content_id) {

  // We're using a MySQLism (STDDEV isn't ANSI SQL), but it's OK because this is

  // an example. And no one would ever base real code on sample code. Ever. Never.

  $sql = "SELECT v.tag, STDDEV(v.value) as standard_deviation ";

  $sql .= "FROM {votingapi_vote} v ";

  $sql .= "WHERE v.content_type = '%s' AND v.content_id = %d AND v.value_type = 'percent' ";

  $sql .= "GROUP BY v.tag";

  $aggregates = db_query($sql, $content_type, $content_id);

  // VotingAPI wants the data in the following format:

  // $vote_results[$tag][$value_type][$aggregate_function] = $value;

  while ($aggregate = db_fetch_array($aggregates)) {

    $vote_results[$result['tag']]['percent']['standard_deviation'] = $result['standard_deviation'];

  }

}

/**

 * Adds to or alters metadata describing Voting tags, value_types, and

 * functions.

 *

 * If your module uses custom tags or value_types, or calculates custom

 * aggregate functions, please implement this hook so other modules can

 * properly interperet and display your data.

 *

 * Three major bins of data are stored: tags, value_types, and aggregate result

 * functions. Each entry in these bins is keyed by the value stored in the

 * actual VotingAPI tables, and contains an array with (minimally) 'name' and

 * 'description' keys. Modules can add extra keys to their entries if desired.

 *

 * @param $data

 *   An alterable array of aggregate vote results.

 *

 * @see votingapi_metadata()

 */

function hook_votingapi_metadata_alter(&$data) {

  // Document several custom tags for rating restaurants and meals.

  $data['tags']['bread'] = array(

    'name' => t('Bread'),

    'description' => t('The quality of the food at a restaurant.'),

    'module' => 'mymodule',

    // This is optional; we can add it for our own purposes.

  );

  $data['tags']['circuses'] = array(

    'name' => t('Circuses'),

    'description' => t('The quality of the presentation and atmosphere at a restaurant.'),

    'module' => 'mymodule',

  );

  // Document two custom aggregate function.

  $data['functions']['standard_deviation'] = array(

    'name' => t('Standard deviation'),

    'description' => t('The standard deviation of all votes cast on a given piece of content. Use this to find controversial content.'),

    'module' => 'mymodule',

  );

  $data['functions']['median'] = array(

    'name' => t('Median vote'),

    'description' => t('The median vote value cast on a given piece of content. More accurate than a pure average when there are a few outlying votes.'),

    'module' => 'mymodule',

  );

}

/**

 * Returns callback functions and descriptions to format a VotingAPI Views

 * field.

 *

 * Loads all votes for a given piece of content, then calculates and caches the

 * aggregate vote results. This is only intended for modules that have assumed

 * responsibility for the full voting cycle: the votingapi_set_vote() function

 * recalculates automatically.

 *

 * @param object $field

 *   A Views field object. This can be used to expose formatters only for tags,

 *   vote values, aggregate functions, etc.

 *

 * @return array

 *   An array of key-value pairs, in which each key is a callback function and

 *   each value is a human-readable description of the formatter.

 *

 * @see votingapi_set_votes()

 */

function hook_votingapi_views_formatters($field) {

  if ($field->field == 'value') {

    return array('mymodule_funky_formatter' => t('MyModule value formatter'));

  }

  if ($field->field == 'tag') {

    return array('mymodule_funky_tags' => t('MyModule tag formatter'));

  }

}

/**

 * Save a vote in the database.

 *

 * @param $vote

 *   See votingapi_add_votes() for the structure of this array, with the

 *   defaults loaded from votingapi_prep_vote().

 */

function hook_votingapi_storage_add_vote(&$vote) {

  _mongodb_votingapi_prepare_vote($criteria);

  mongodb_collection('votingapi_vote')->insert($vote);

}

/**

 * Delete votes from the database.

 *

 * @param $votes

 *   An array of votes to delete. Minimally, each vote must have the 'vote_id'

 *   key set.

 * @param $vids

 *   A list of the 'vote_id' values from $voes.

 */

function hook_votingapi_storage_delete_votes($votes, $vids) {

  mongodb_collection('votingapi_vote')->delete(array('vote_id' => array('$in' => array_map('intval', $vids))));

}

/**

 * Select invidual votes from the database

 *

 * @param array $criteria

 *   A keyed array used to build the select query. Keys can contain

 *   a single value or an array of values to be matched.

 *   $criteria['vote_id']       (If this is set, all other keys are skipped)

 *   $criteria['entity_id']

 *   $criteria['entity_type']

 *   $criteria['value_type']

 *   $criteria['tag']

 *   $criteria['uid']

 *   $criteria['vote_source']

 *   $criteria['timestamp']   If this is set, records with timestamps

 *      GREATER THAN the set value will be selected. Defaults to

 *      REQUEST_TIME - variable_get('votingapi_anonymous_window', 3600); if

 *      the anonymous window is above zero.

 * @param int $limit

 *   An integer specifying the maximum number of votes to return. 0 means

 *   unlimited and is the default.

 *

 * @return array

 *   An array of votes matching the criteria.

 */

function hook_votingapi_storage_select_votes($criteria, $limit) {

  _mongodb_votingapi_prepare_vote($criteria);

  $find = array();

  foreach ($criteria as $key => $value) {

    $find[$key] = is_array($value) ? array('$in' => $value) : $value;

  }

  $cursor = mongodb_collection('votingapi_vote')->find($find);

  if (!empty($limit)) {

    $cursor->limit($limit);

  }

  $votes = array();

  foreach ($cursor as $vote) {

    $votes[] = $vote;

  }

  return $votes;

}

/**

 * Allows to act on votes before being inserted.

 *

 * @param $votes

 *  An array of votes, each with the following structure:

 *  $vote['entity_type']  (Optional, defaults to 'node')

 *  $vote['entity_id']    (Required)

 *  $vote['value_type']    (Optional, defaults to 'percent')

 *  $vote['value']         (Required)

 *  $vote['tag']           (Optional, defaults to 'vote')

 *  $vote['uid']           (Optional, defaults to current user)

 *  $vote['vote_source']   (Optional, defaults to current IP)

 *  $vote['timestamp']     (Optional, defaults to REQUEST_TIME)

 */

function hook_votingapi_preset_votes(&$votes) {

  foreach ($votes as $vote) {

    if ($vote['tag'] == 'recommend') {

      // Do something if the 'recommend' vote is being inserted.

    }

  }

}

/**

 * TODO

 *

 */

function hook_votingapi_storage_standard_results($entity_id, $entity) {

  // TODO

}