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Edit File: taxonomy_test.module

<?php

/**
 * @file
 * Test module for Taxonomy hooks and functions not used in core.
 *
 * @see TaxonomyHooksTestCase::testTaxonomyTermHooks()
 */

/**
 * Implements hook_taxonomy_term_load().
 */
function taxonomy_test_taxonomy_term_load($terms) {
  foreach ($terms as $term) {
    $antonym = taxonomy_test_get_antonym($term->tid);
    if ($antonym) {
      $term->antonym = $antonym;
    }
  }
}

/**
 * Implements hook_taxonomy_term_insert().
 */
function taxonomy_test_taxonomy_term_insert($term) {
  if (!empty($term->antonym)) {
    db_insert('taxonomy_term_antonym')
      ->fields(array(
        'tid' => $term->tid,
        'name' => trim($term->antonym)
      ))
      ->execute();
  }
}

/**
 * Implements hook_taxonomy_term_update().
 */
function taxonomy_test_taxonomy_term_update($term) {
  if (!empty($term->antonym)) {
    db_merge('taxonomy_term_antonym')
      ->key(array('tid' => $term->tid))
      ->fields(array(
        'name' => trim($term->antonym)
      ))
      ->execute();
  }
}

/**
 * Implements hook_taxonomy_term_delete().
 */
function taxonomy_test_taxonomy_term_delete($term) {
  db_delete('taxonomy_term_antonym')
    ->condition('tid', $term->tid)
    ->execute();
}

/**
 * Implements hook_taxonomy_term_view().
 */
function taxonomy_test_taxonomy_term_view($term, $view_mode, $langcode) {
  if ($view_mode == 'full') {
    $term->content['taxonomy_test_term_view_check'] = array(
      '#prefix' => '<div>',
      '#markup' => t('The antonym is %antonym', array('%antonym' => $term->antonym)),
      '#suffix' => '</div>',
      '#weight' => 10,
    );
  }
}

/**
 * Implements hook_entity_view().
 */
function taxonomy_test_entity_view($entity, $type, $view_mode, $langcode) {
  if ($type == 'taxonomy_term' && $view_mode == 'full') {
    $entity->content['taxonomy_test_entity_view_check'] = array(
      '#prefix' => '<div>',
      '#markup' => t('The antonym is %antonym', array('%antonym' => $entity->antonym)),
      '#suffix' => '</div>',
      '#weight' => 20,
    );
  }
}

/**
 * Implements hook_form_alter().
 */
function taxonomy_test_form_alter(&$form, $form_state, $form_id) {
  if ($form_id == 'taxonomy_form_term') {
    $antonym = taxonomy_test_get_antonym($form['#term']['tid']);
    $form['advanced']['antonym'] = array(
      '#type' => 'textfield',
      '#title' => t('Antonym'),
      '#default_value' => !empty($antonym) ? $antonym : '',
      '#description' => t('Antonym of this term.')
    );
  }
}

/**
 * Return the antonym of the given term ID.
 */
function taxonomy_test_get_antonym($tid) {
  return db_select('taxonomy_term_antonym', 'ta')
    ->fields('ta', array('name'))
    ->condition('tid', $tid)
    ->execute()
    ->fetchField();
}

/**
 * Implements hook_query_alter().
 */
function taxonomy_test_query_alter(QueryAlterableInterface $query) {
  $value = variable_get(__FUNCTION__);
  if (isset($value)) {
    variable_set(__FUNCTION__, ++$value);
  }
}

/**
 * Implements hook_query_TAG_alter().
 */
function taxonomy_test_query_term_access_alter(QueryAlterableInterface $query) {
  $value = variable_get(__FUNCTION__);
  if (isset($value)) {
    variable_set(__FUNCTION__, ++$value);
  }
}

/**
 * Implements hook_query_TAG_alter().
 */
function taxonomy_test_query_taxonomy_term_access_alter(QueryAlterableInterface $query) {
  $value = variable_get(__FUNCTION__);
  if (isset($value)) {
    variable_set(__FUNCTION__, ++$value);
  }
}

/**
 * Implements hook_block_info().
 */
function taxonomy_test_block_info() {
  $blocks['test_block_form'] = array(
    'info' => t('Test block with form'),
  );
  return $blocks;
}

/**
 * Implements hook_block_view().
 */
function taxonomy_test_block_view($delta = 0) {
  $form = drupal_get_form('taxonomy_test_simple_form');
  return array('subject' => 'Simple form', 'content' => drupal_render($form));
}

/**
 * Form builder for testing submission on taxonomy terms overview page.
 */
function taxonomy_test_simple_form($form, &$form_state) {
  $form['submit'] = array(
    '#type' => 'submit',
    '#value' => t('Submit'),
  );
  return $form;
}

/**
 * Test controller class for taxonomy terms.
 *
 * The main purpose is to make cacheGet() method available for testing.
 */
class TestTaxonomyTermController extends TaxonomyTermController {
  public function loadFromCache($ids, $conditions = array()) {
    return parent::cacheGet($ids, $conditions);
  }
}