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<?php

/**

 * @file

 * Install, update and uninstall functions for the search module.

 */

/**

 * Implements hook_uninstall().

 */

function search_uninstall() {

  variable_del('minimum_word_size');

  variable_del('overlap_cjk');

  variable_del('search_cron_limit');

}

/**

 * Implements hook_schema().

 */

function search_schema() {

  $schema['search_dataset'] = array(

    'description' => 'Stores items that will be searched.',

    'fields' => array(

      'sid' => array(

        'type' => 'int',

        'unsigned' => TRUE,

        'not null' => TRUE,

        'default' => 0,

        'description' => 'Search item ID, e.g. node ID for nodes.',

      ),

      'type' => array(

        'type' => 'varchar',

        'length' => 16,

        'not null' => TRUE,

        'description' => 'Type of item, e.g. node.',

      ),

      'data' => array(

        'type' => 'text',

        'not null' => TRUE,

        'size' => 'big',

        'description' => 'List of space-separated words from the item.',

      ),

      'reindex' => array(

        'type' => 'int',

        'unsigned' => TRUE,

        'not null' => TRUE,

        'default' => 0,

        'description' => 'Set to force node reindexing.',

      ),

    ),

    'primary key' => array('sid', 'type'),

  );

  $schema['search_index'] = array(

    'description' => 'Stores the search index, associating words, items and scores.',

    'fields' => array(

      'word' => array(

        'type' => 'varchar',

        'length' => 50,

        'not null' => TRUE,

        'default' => '',

        'description' => 'The {search_total}.word that is associated with the search item.',

      ),

      'sid' => array(

        'type' => 'int',

        'unsigned' => TRUE,

        'not null' => TRUE,

        'default' => 0,

        'description' => 'The {search_dataset}.sid of the searchable item to which the word belongs.',

      ),

      'type' => array(

        'type' => 'varchar',

        'length' => 16,

        'not null' => TRUE,

        'description' => 'The {search_dataset}.type of the searchable item to which the word belongs.',

      ),

      'score' => array(

        'type' => 'float',

        'not null' => FALSE,

        'description' => 'The numeric score of the word, higher being more important.',

      ),

    ),

    'indexes' => array(

      'sid_type' => array('sid', 'type'),

    ),

    'foreign keys' => array(

      'search_dataset' => array(

        'table' => 'search_dataset',

        'columns' => array(

          'sid' => 'sid',

          'type' => 'type',

        ),

      ),

    ),

    'primary key' => array('word', 'sid', 'type'),

  );

  $schema['search_total'] = array(

    'description' => 'Stores search totals for words.',

    'fields' => array(

      'word' => array(

        'description' => 'Primary Key: Unique word in the search index.',

        'type' => 'varchar',

        'length' => 50,

        'not null' => TRUE,

        'default' => '',

      ),

      'count' => array(

        'description' => "The count of the word in the index using Zipf's law to equalize the probability distribution.",

        'type' => 'float',

        'not null' => FALSE,

      ),

    ),

    'primary key' => array('word'),

  );

  $schema['search_node_links'] = array(

    'description' => 'Stores items (like nodes) that link to other nodes, used to improve search scores for nodes that are frequently linked to.',

    'fields' => array(

      'sid' => array(

        'type' => 'int',

        'unsigned' => TRUE,

        'not null' => TRUE,

        'default' => 0,

        'description' => 'The {search_dataset}.sid of the searchable item containing the link to the node.',

      ),

      'type' => array(

        'type' => 'varchar',

        'length' => 16,

        'not null' => TRUE,

        'default' => '',

        'description' => 'The {search_dataset}.type of the searchable item containing the link to the node.',

      ),

      'nid' => array(

        'type' => 'int',

        'unsigned' => TRUE,

        'not null' => TRUE,

        'default' => 0,

        'description' => 'The {node}.nid that this item links to.',

      ),

      'caption' => array(

        'type' => 'text',

        'size' => 'big',

        'not null' => FALSE,

        'description' => 'The text used to link to the {node}.nid.',

      ),

    ),

    'primary key' => array('sid', 'type', 'nid'),

    'indexes' => array(

      'nid' => array('nid'),

    ),

  );

  return $schema;

}

/**

 * Replace unique keys in 'search_dataset' and 'search_index' by primary keys.

 */

function search_update_7000() {

  db_drop_unique_key('search_dataset', 'sid_type');

  $dataset_type_spec = array(

    'type' => 'varchar',

    'length' => 16,

    'not null' => TRUE,

    'description' => 'Type of item, e.g. node.',

  );

  db_change_field('search_dataset', 'type', 'type', $dataset_type_spec);

  db_add_primary_key('search_dataset', array('sid', 'type'));

  db_drop_index('search_index', 'word');

  db_drop_unique_key('search_index', 'word_sid_type');

  $index_type_spec = array(

    'type' => 'varchar',

    'length' => 16,

    'not null' => TRUE,

    'description' => 'The {search_dataset}.type of the searchable item to which the word belongs.',

  );

  db_change_field('search_index', 'type', 'type', $index_type_spec);

  db_add_primary_key('search_index', array('word', 'sid', 'type'));

}